The following lists only preprints without a corresponding final revised paper.
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04 Apr 2025
Stratospheric δ13CO2 observed over Japan and its governing processes and potential as an air age tracer
Satoshi Sugawara, Shinji Morimoto, Shigeyuki Ishidoya, Taku Umezawa, Shuji Aoki, Takakiyo Nakazawa, Sakae Toyoda, Kentaro Ishijima, Daisuke Goto, and Hideyuki Honda
EGUsphere, https://doi.org/10.5194/egusphere-2025-1003, https://doi.org/10.5194/egusphere-2025-1003, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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We have been collected stratospheric air samples since 1985 over Japan and analyzed them for δ13CO2. δ13CO2 has decreased through time in the mid-stratosphere with an average rate of change of −0.026 ± 0.001 ‰ yr−1. It has become clear that the oxidation of methane and gravitational separation are important for stratospheric δ13CO2 variations. We newly defined ‘stratospheric potential δ13C’ as a quasi-conservative parameter and demonstrated that it can be used as an air age tracer.
04 Apr 2025
Seasonality of the Quasi-biennial Oscillation signal in water vapor in the tropical stratosphere
Qian Lu, Jian Rao, Chunhua Shi, and Chaim I. Garfinkel
EGUsphere, https://doi.org/10.5194/egusphere-2025-1123, https://doi.org/10.5194/egusphere-2025-1123, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Stratospheric water vapor has been proven to have significant climate effects as a greenhouse gas. Tropical stratospheric water vapor exhibits a clear imprint of the Quasi-Biennial Oscillation (QBO). This study compares the water vapor variations associated with the QBO between boreal winter and summer, and the seasonal difference in the water vapor QBO signals is revealed.
04 Apr 2025
Measurement report: Investigation of Optical Properties of Different Fuels Diesel Exhaust by an Atmospheric Simulation Chamber experiment
Silvia Giulia Danelli, Lorenzo Caponi, Marco Brunoldi, Matilde De Camillis, Dario Massabò, Federico Mazzei, Tommaso Isolabella, Annalisa Pascarella, Paolo Prati, Matteo Santostefano, Francesca Tarchino, Virginia Vernocchi, and Paolo Brotto
EGUsphere, https://doi.org/10.5194/egusphere-2025-1447, https://doi.org/10.5194/egusphere-2025-1447, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study examines optical properties and the variability of the mass absorption coefficient of carbonaceous aerosols produced by the combustion of different fuels. Experiments, conducted in an atmospheric simulation chamber, tested different methods of sampling and analyzing carbonaceous aerosols, with a focus on workplace environments. Results highlight the need to understand the variability in aerosol optical properties for accurate monitoring and health and environmental impact assessments.
04 Apr 2025
Initiation of linoleic acid autoxidation with ozone exposure in levitated aerosol particles
Marcel Müller, Marcel Reichmuth, and Ulrich Karl Krieger
EGUsphere, https://doi.org/10.5194/egusphere-2025-1238, https://doi.org/10.5194/egusphere-2025-1238, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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The initiation of autoxidation by ozonolysis was investigated on levitated linoleic acid droplets using electrodynamic balance–mass spectrometry. Exposing the droplets to ozone for one hour before switching the gas phase to air without ozone led to a shortening of the autoxidation initiation phase in comparison to experiments without ozone exposure. Results were compared to a bulk reaction model to investigate the synergistic effects of ozonolysis and autoxidation.
04 Apr 2025
Distinct aerosol populations and their vertical gradients in central Amazonia revealed by optical properties and cluster analysis
Rafael Valiati, Bruno Backes Meller, Marco Aurélio Franco, Luciana Varanda Rizzo, Luiz Augusto Toledo Machado, Sebastian Brill, Bruna A. Holanda, Leslie A. Kremper, Subha S. Raj, Samara Carbone, Cléo Quaresma Dias-Júnior, Fernando Gonçalves Morais, Meinrat O. Andreae, Ulrich Pöschl, Christopher Pöhlker, and Paulo Artaxo
EGUsphere, https://doi.org/10.5194/egusphere-2025-1078, https://doi.org/10.5194/egusphere-2025-1078, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study highlights the different aerosol populations that are commonly observed in the central Amazon. Vertical gradients of aerosol optical and chemical properties were evaluated on different atmospheric conditions, and showed distinct characteristics of these particles. Intercontinental transport events bring to the region particles with a contrasting chemical composition, while vertical transport processes influence the aerosol properties by promoting the development of coating and aging.
04 Apr 2025
New insights into the 2021 La Palma eruption degassing processes from direct-sun spectroscopic measurements
Noémie Taquet, Thomas Boulesteix, Omaira García, Robin Campion, Wolfgang Stremme, Sergio Rodríguez, Jessica López-Darias, Carlos Marrero, Diego González-García, Andreas Klügel, Frank Hase, M. Isabel García, Ramón Ramos, Pedro Rivas-Soriano, Sergio Léon-Luis, Virgilio Carreño, Antonio Alcántara, Eliezer Sépulveda, Celia Milford, Pablo González-Sicilia, and Carlos Torres
EGUsphere, https://doi.org/10.5194/egusphere-2025-1092, https://doi.org/10.5194/egusphere-2025-1092, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Direct-sun solar absorption FTIR and DOAS measurements were performed during the 2021 La Palma eruption from distance up to 140 km. Using FTIR-DOAS gas-to-sulfur ratios and SO2 fluxes derived from TROPOMI, CO2, CO, HCl, HF volcanic emissions were estimated. Estimates of emission budget were found in good agreement with petrologic data. This study demonstrates the feasability of using existing atmospheric monitoring network to monitor volcanic eruptions.
03 Apr 2025
Building-resolving simulations of anthropogenic and biospheric CO2 in the city of Zurich with GRAMM/GRAL
Dominik Brunner, Ivo Suter, Leonie Bernet, Lionel Constantin, Stuart K. Grange, Pascal Rubli, Junwei Li, Jia Chen, Alessandro Bigi, and Lukas Emmenegger
EGUsphere, https://doi.org/10.5194/egusphere-2025-640, https://doi.org/10.5194/egusphere-2025-640, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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In order to support the city of Zurich in tracking its path to net-zero greenhouse gas emissions planned to be reached by 2040, a CO2 emission monitoring system was established. The system combines a dense network of CO2 sensors with a high-resolution atmospheric transport model GRAMM/GRAL. This study presents the setup of the model together with its numerous inputs and evaluates its performance in comparison with the observations from the CO2 sensor network.
03 Apr 2025
Gas-Ice Partitioning Coefficients of Carbonyls during Diffusional Ice Crystal Growth
Jackson Seymore, Miklós Szakáll, Alexander Theis, Subir K. Mitra, Christine Borchers, and Thorsten Hoffmann
EGUsphere, https://doi.org/10.5194/egusphere-2025-1425, https://doi.org/10.5194/egusphere-2025-1425, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Laboratory studies examined carbonyl deposition into ice crystals using a flowtube setup. Ice crystals were grown under conditions that mimic cirrus clouds in the presence of carbonyl vapors. Ice and gas samples were collected and analyzed to calculate partitioning coefficients for 14 carbonyls at different temperatures. This revealed an inverse relationship between partitioning and temperature. Vapor pressure and molar mass were found to be the most significant factors in uptake.
02 Apr 2025
Global Optimal Estimation Retrievals of Atmospheric Carbonyl Sulfide Over Water from IASI Measurement Spectra for 2018
Michael P. Cartwright, Jeremy J. Harrison, David P. Moore, Richard J. Pope, Martyn P. Chipperfield, Chris Wilson, and Wuhu Feng
EGUsphere, https://doi.org/10.5194/egusphere-2025-1073, https://doi.org/10.5194/egusphere-2025-1073, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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We use satellite measurements to estimate quantities of a gas called carbonyl sulfide (OCS) in the atmosphere. OCS is consumed during photosynthesis, much like carbon dioxide (CO2). Our data is focused mostly over the global oceans for the year 2018, and we find it compares well with past satellite observations, ground-based measurements and modelled OCS. We hope to extend this measurement record and use it in data-driven tools in the future to better understand the carbon cycle globally.
02 Apr 2025
Exploiting airborne far-infrared measurements to optimise an ice cloud retrieval
Sanjeevani Panditharatne, Helen Brindley, Caroline Cox, Rui Song, Richard Siddans, Richard Bantges, Jonathan Murray, Stuart Fox, and Cathryn Fox
EGUsphere, https://doi.org/10.5194/egusphere-2025-647, https://doi.org/10.5194/egusphere-2025-647, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Upwelling radiation with wavelengths between 15 and 100 microns is theorised to be highly sensitive to the properties of ice clouds, particularly the shape of the ice crystals. We exploit this sensitivity and perform the first retrieval of ice cloud properties using these wavelengths from an observation taken on an aircraft and evaluate it against measurements of the cloud’s properties.
01 Apr 2025
Measurement Report: Seasonal trends and chemical speciation of chromium (III/VI) in different fractions of urban particulate matter – a case study of Radom, Poland
Monika Łożyńska, Marzena Trojanowska, Artur Molik, and Ryszard Świetlik
EGUsphere, https://doi.org/10.5194/egusphere-2025-541, https://doi.org/10.5194/egusphere-2025-541, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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The assessment of chromium occurrence in particulate matter in cities: PM10, PM2.5, PM1 and PM0.25 during the calendar year was presented. The seasonality of both pseudototal chromium content and its valence speciation was examined. Seasonality of changes in Crtot and Cr(VI) concentrations was observed. Maximum in the winter season, most likely due to the greater share of fuel combustion sources. Regardless of the season, the risk levels for Radom residents were within the acceptable risk range.
01 Apr 2025
Tracing Ammonia Emission Sources in California's Salton Sea Region: Insights from Airborne Longwave-Infrared Hyperspectral Imaging and Ground Monitoring
Sina Hasheminassab, David M. Tratt, Olga V. Kalashnikova, Clement S. Chang, Morad Alvarez, Kerry N. Buckland, Michael J. Garay, Francesca M. Hopkins, Eric R. Keim, Le Kuai, Yaning Miao, Payam Pakbin, William C. Porter, and Mohammad H. Sowlat
EGUsphere, https://doi.org/10.5194/egusphere-2025-1378, https://doi.org/10.5194/egusphere-2025-1378, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Ammonia (NH3) is a key air pollutant linked to fine particle pollution, yet its sources remain poorly understood. Using airborne infrared imaging and ground sensors, we mapped NH3 emissions in California’s Salton Sea region with unprecedented detail. We found high emissions from farms, geothermal plants, and waste sites, including sources missing from inventories. These findings highlight the need for better NH3 monitoring to improve air quality models and guide pollution reduction strategies.
01 Apr 2025
Tropospheric Ozone Assessment Report (TOAR): 16-year ozone trends from the IASI Climate Data Record
Anne Boynard, Catherine Wespes, Juliette Hadji-Lazaro, Selviga Sinnathamby, Daniel Hurtmans, Pierre-François Coheur, Marie Doutriaux-Boucher, Jacobus Onderwaater, Wolfgang Steinbrecht, Elyse A. Pennington, Kevin Bowman, and Cathy Clerbaux
EGUsphere, https://doi.org/10.5194/egusphere-2025-1054, https://doi.org/10.5194/egusphere-2025-1054, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study analyzes 16 years of global ozone data to assess its impact on air quality and climate. Using satellite measurements, we observed a global decrease in tropospheric ozone, particularly in tropical and European regions. The study highlights the importance of long-term data for tracking trends, especially during events like the pandemic. We emphasize the need for improved data processing and integrating multiple datasets to better understand ozone trends.
01 Apr 2025
Microphysical fingerprints in anvil cloud albedo
Declan L. Finney, Alan M. Blyth, Paul R. Field, Martin I. Daily, Benjamin J. Murray, Mengyu Sun, Paul J. Connolly, Zhiqiang Cui, and Steven Böing
EGUsphere, https://doi.org/10.5194/egusphere-2025-1227, https://doi.org/10.5194/egusphere-2025-1227, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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We present observation-informed modelling from the Deep Convective Microphysics Experiment to study how environmental conditions and cloud processes affect anvil cloud albedo and radiation. Aerosols influencing cloud droplets or influencing ice formation yield varying radiative effects. We introduce fingerprint metrics to discern these effects. Using detailed observations and modelling, we offer insights into high cloud radiative effects and feedbacks.
01 Apr 2025
Emission characteristics of greenhouse gases and air pollutants in a Qinghai-Tibetan Plateau city using a portable Fourier transform spectrometer and TROPOMI observations
Qiansi Tu, Frank Hase, Ying Zhang, Jiaxin Fang, Yanwu Jiang, Xiaofan Li, Matthias Schneider, Zhuolin Yang, Xin Zhang, and Zhengqiang Li
EGUsphere, https://doi.org/10.5194/egusphere-2025-966, https://doi.org/10.5194/egusphere-2025-966, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Understanding GHG and air pollutant concentrations and emissions characteristics in the Qinghai-Tibetan Plateau cities remains limited. We present the first CO2, CH4 and CO column abundances using a portal FTIR spectrometer in Xining in 2024. Ground-based data exceeded satellite and model estimates, indicating higher local emissions. Significant CO discrepancies and a strong ∆XCO–∆XCO2 correlation under easterly winds highlight the value of portable FTIR for urban emission studies in the QTP.
01 Apr 2025
Balloon Observations Suggesting Sea Salt Injection into the Stratosphere from Hunga Tonga-Hunga Ha'apai
Hazel Vernier, Demilson Quintão, Bruno Biazon, Eduardo Landulfo, Giovanni Souza, V. Amanda Santos, J. S. Fabio Lopes, C. P. Alex Mendes, A. S. José da Matta, K. Pinheiro Damaris, Benoit Grosslin, P. M. P. Maria Jorge, Maria de Fátima Andrade, Neeraj Rastogi, Akhil Raj, Hongyu Liu, Mahesh Kovilakam, Suvarna Fadnavis, Frank G. Wienhold, Mathieu Colombier, D. Chris Boone, Gwenael Berthet, Nicolas Dumelie, Lilian Joly, and Jean-Paul Vernier
EGUsphere, https://doi.org/10.5194/egusphere-2025-924, https://doi.org/10.5194/egusphere-2025-924, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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The eruption of Hunga Tonga-Hunga Ha'apai injected large amounts of water vapor and sea salt into the stratosphere, altering traditional views of volcanic aerosols. Using balloon-borne samplers, we collected aerosol samples and found high levels of sea salt and calcium, suggesting sulfate depletion due to gypsum formation. These findings highlight the need to consider sea salt in climate models to better predict volcanic impacts on the atmosphere and climate.
31 Mar 2025
New water-soluble, toxic tracers of wood burning identified in fine brown carbon aerosol using a non-target approach
Vinh Nguyen, Bartłomiej Witkowski, and Tomasz Gierczak
EGUsphere, https://doi.org/10.5194/egusphere-2025-1251, https://doi.org/10.5194/egusphere-2025-1251, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This article provides new insights into the molecular composition of fine, light-absorbing organic aerosols emitted by biomass burning. Laboratory-generated aerosol was extracted into water and analyzed with liquid chromatography-mass spectrometry, identifying over 350 new water-soluble wood burning tracers. This study also examines the toxicities and atmospheric lifetimes, revealing that the newly identified molecules are harmful and can undergo chemical processing in atmospheric hydrometeors.
31 Mar 2025
Competing multiple oxidation pathways shape atmospheric limonene-derived organonitrates simulated with updated explicit chemical mechanisms
Qinghao Guo, Haofei Zhang, Bo Long, Lehui Cui, Yiyang Sun, Hao Liu, Yaxin Liu, Yunting Xiao, Pingqing Fu, and Jialei Zhu
EGUsphere, https://doi.org/10.5194/egusphere-2025-1058, https://doi.org/10.5194/egusphere-2025-1058, 2025
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Limonene, a natural compound from plants, reacts with pollutants to form airborne particles that influence air quality and climate. Using advanced models with explicit chemical mechanisms, we show how different reaction pathways shape organonitrate formation, with some increasing and others decreasing particle levels. This approach enhancing predictions of pollution and climate impacts while deepening our understanding of how natural and human-made emissions interact in the atmosphere.
31 Mar 2025
Measurement report: Year-long chemical composition, optical properties, and sources of atmospheric aerosols in the northeastern Tibetan Plateau
Kemei Li, Yanqing An, Jianzhong Xu, Miao Zhong, Wenhui Zhao, and Xiang Qin
EGUsphere, https://doi.org/10.5194/egusphere-2025-41, https://doi.org/10.5194/egusphere-2025-41, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study presents a year-long PM2.5 study at Waliguan Baseline Observatory in the northeast of the Tibet Plateau to investigate the optical properties of water-soluble brown carbon and its source. Our findings highlight that organic matter, sulfate, and nitrate are the dominant contributors to PM2.5 mass concentrations. Notable seasonal variations in the light absorption capacity of water-soluble brown carbon, accompanied by a high degree of photochemical oxidation are also observed.
31 Mar 2025
Widespread stratospheric intrusion influence on summer ozone pollution over China revealed by multi-site ozonesonde, ground-based measurement and fully-validated reanalysis
Zhiheng Liao, Jinqiang Zhang, Meng Gao, and Zhiqiang Ma
EGUsphere, https://doi.org/10.5194/egusphere-2025-15, https://doi.org/10.5194/egusphere-2025-15, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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We present observational evidence for widespread SI influence on surface ozone pollution from western plateaus to eastern plains over China in a deep trough event based on multi-site ozonesondes, nationwide surface ozone measurements, and fully-validate atmospheric ozone reanalsyis. The observational results refine the fundamental understanding of stratospheric ozone intrusion and its contribution to surface ozone pollution in China.
28 Mar 2025
Measurement report: Aerosol and cloud nuclei properties along the Central and Northern Great Barrier Reef: Impact of continental emissions
E. Johanna Horchler, Joel Alroe, Luke Harrison, Luke Cravigan, Daniel P. Harrison, and Zoran D. Ristovski
EGUsphere, https://doi.org/10.5194/egusphere-2025-465, https://doi.org/10.5194/egusphere-2025-465, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Aerosols play a role in global climate by interacting with incoming solar radiation and by taking up water vapour from the atmosphere to form clouds. Enhancing local-scale cloud cover can reduce sea surface temperatures. Coral bleaching events increased in the Great Barrier Reef (GBR) as sea surface temperatures rise. Our study found that the number of aerosols and the cloud forming ability over the GBR increased if the aerosols were transported from inland Australia rather than the ocean.
28 Mar 2025
Wildfires heat the middle troposphere over the Himalayas and Tibetan Plateau during the peak of fire season
Qiaomin Pei, Chuanfeng Zhao, Yikun Yang, Annan Chen, Zhiyuan Cong, Xin Wan, Haotian Zhang, and Guangming Wu
EGUsphere, https://doi.org/10.5194/egusphere-2025-1172, https://doi.org/10.5194/egusphere-2025-1172, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study investigates smoke's impact on atmospheric warming over the Himalayan and Tibetan Plateau (HTP) using MODIS fire data, ground-based and satellite aerosol observations, and model simulations. It finds that smoke aerosols – predominantly concentrated between 6 and 8 km in the mid-troposphere over southern HTP – likely alter regional atmospheric stability by modifying the vertical temperature profile, as indicated by a reduced lapse rate.
28 Mar 2025
A comprehensive review of tropospheric background ozone: Definitions, estimation methods, and meta-analysis of its spatiotemporal distribution in China
Chujun Chen, Weihua Chen, Linhao Guo, Yongkang Wu, Xianzhong Duan, Xuemei Wang, and Min Shao
EGUsphere, https://doi.org/10.5194/egusphere-2025-687, https://doi.org/10.5194/egusphere-2025-687, 2025
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Background O3 forms the baseline level of O3 pollution, even without local human activities. This review examines how background O3 is defined and estimated, revealing significant variations across China, with higher level in the Northwest and lower in the Northeast region. Globally, China’s background O3 levels are medium-to-high and rising. The study calls for integrated estimation methods, international collaboration, and research on climate-ozone links to improve air quality strategies.
28 Mar 2025
Sensitivity of Simulated Ammonia Fluxes in Rocky Mountain National Park to Measurement Time Resolution and Meteorological Inputs
Lillian E. Naimie, Da Pan, Amy P. Sullivan, John T. Walker, Aleksandra Djurkovic, Bret A. Schichtel, and Jeffrey L. Collett Jr.
EGUsphere, https://doi.org/10.5194/egusphere-2025-1167, https://doi.org/10.5194/egusphere-2025-1167, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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The contribution of ammonia atmosphere-surface exchange to excess deposition of reactive nitrogen is poorly understood. Reactive nitrogen deposition has negative impacts on ecosystem health. Ammonia can be difficult and expensive to measure. We demonstrate that depositions modeled using low-cost measurements underestimate ecosystem inputs but can be corrected using typical daily concentration cycles. We also illustrate the limitations of reanalysis meteorology for ammonia deposition modeling.
27 Mar 2025
Saharan dust transport event characterization in the Mediterranean atmosphere using 21 years of in-situ observations
Franziska Vogel, Davide Putero, Paolo Bonasoni, Paolo Cristofanelli, Marco Zanatta, and Angela Marinoni
EGUsphere, https://doi.org/10.5194/egusphere-2025-1278, https://doi.org/10.5194/egusphere-2025-1278, 2025
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Dust is in terms of mass the most abundant aerosol in the atmosphere. It can have a significant influence on e.g. the scattering and absorption of light, cloud formation, and solar energy production. We present 21 years of optical particle size distribution measurements at a mountain station in Italy, from which we assess Saharan dust transport events. A peak in the number of events was observed in summer and autumn, while a trend in the number of events over the 21 years was not detected.
27 Mar 2025
Fine-scale fluctuations of PM1, PM2.5, PM10 and SO2 concentrations caused by a prolonged volcanic eruption (Fagradalsfjall 2021, Iceland)
Rachel C. W. Whitty, Evgenia Ilyinskaya, Melissa A. Pfeffer, Ragnar H. Thrastarson, Þorsteinn Johannsson, Sara Barsotti, Tjarda J. Roberts, Guðni M. Gilbert, Tryggvi Hjörvar, Anja Schmidt, Daniela Fecht, and Grétar G. Sæmundsson
EGUsphere, https://doi.org/10.5194/egusphere-2025-937, https://doi.org/10.5194/egusphere-2025-937, 2025
Preprint under review for ACP (discussion: open, 3 comments)
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Our work focuses on volcanic emissions, a poorly understood air pollution hazard in populated areas. We present a large dataset of reference-grade measurements of sulfur dioxide gas and aerosol particulate matter (PM1, PM2.5 and PM10) collected during a recent episode of eruptions in Iceland, which is still ongoing at the time of writing. We identified fine-scale fluctuations in ground-level concentrations of these pollutants and we discuss the implications of these for population exposures.
26 Mar 2025
Scattering properties and Lidar Characteristics of Asian Dust Particles Based on Realistic Shape Models
Anthony La Luna, Zhibo Zhang, Jianyu Zheng, Qianqian Song, Hongbin Yu, Jiachen Ding, Ping Yang, and Masanori Saito
EGUsphere, https://doi.org/10.5194/egusphere-2025-1117, https://doi.org/10.5194/egusphere-2025-1117, 2025
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The lidar backscattering properties of Asian dust particles were studied using a discrete dipole approximation (DDA) model. Both the lidar ratio (LR) and depolarization ratio (DPR) exhibit an asymptotic trend with dust particle size. Two parameterization schemes were developed: one to estimate the DPR of a single dust particle given its size, and the other to estimate the DPR of dust particles with a lognormal particle size distribution given the effective radius.
26 Mar 2025
Molecular level Insights on the Photosensitized Chemistry of Nonanoic Acid in the Presence of 4-Benzoylbenzoic Acid at the Sea Surface Microlayer
Ahmed Abdelmonem, Dana Glikman, Yiwei Gong, Björn Braunschweig, Harald Saathoff, Johannes Lützenkirchen, and Mohammed H. Fawey
EGUsphere, https://doi.org/10.5194/egusphere-2025-1233, https://doi.org/10.5194/egusphere-2025-1233, 2025
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This study examines how environmental factors (sunlight, pH, salinity, and surface chemistry) affect air-water interface reactions. Using a surface-specific technique, sum-frequency generation (SFG) spectroscopy, we found that compounds like 4-BBA not only act as photosensitizers but also generate new surface-active products under UV light. These reactions have implications for oceans, lakes, and clouds, providing crucial insights for modeling natural processes.
25 Mar 2025
Hydroxymethanesulfonate (HMS) Formation under Urban and Marine Atmosphere: role of aerosol ionic strength
Rongshuang Xu, Yu-Chi Lin, Siyu Bian, Feng Xie, and Yan-Lin Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2025-683, https://doi.org/10.5194/egusphere-2025-683, 2025
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This work reported the hydroxymethanesulfonate (HMS) level in a continental city and, for the first time, in marine atmosphere. The enhancement by aerosol ionic strength (IS) on HMS formation was quantified which first rise with increasing IS, peaking at 4 mol kg–1 before declining. Given the IS range of marine (2–6) and urban aerosol (6–20 mol kg–1) and the clearly negative correlation between humidity and IS, the moderate IS level under humid condition may notably boost ambient HMS formation.
25 Mar 2025
Parameterization adaption needed to unlock the benefits of increased resolution for the ITCZ in ICON
Clarissa A. Kroll, Andrea Schneidereit, Robert C. J. Wills, Luis Kornblueh, and Ulrike Niemeier
EGUsphere, https://doi.org/10.5194/egusphere-2025-1212, https://doi.org/10.5194/egusphere-2025-1212, 2025
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The double Inter-Tropical Convergence Zone is a prominent precipitation bias in climate models. We demonstrate its persistence from a resolution of 160 km up to 5 km. Its root cause lies in biased moisture transport from the subtropics to the inner tropics reducing convection and weakening tropical circulation. Increasing the surface wind speed addresses the bias, but deteriorates the global circulation. This highlights the importance of resolution hierarchies and parametrization development.
25 Mar 2025
Long-term trends in daytime cirrus cloud radiative effects: Analyzing twenty years of Micropulse Lidar Network measurements at Greenbelt, Maryland in eastern North America
Simone Lolli, Erica K. Dolinar, Jasper R. Lewis, Andreu Salcedo-Bosch, James R. Campbell, and Ellsworth J. Welton
EGUsphere, https://doi.org/10.5194/egusphere-2025-1237, https://doi.org/10.5194/egusphere-2025-1237, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Clouds strongly influence Earth's climate by changing how sunlight is reflected or absorbed. We studied thin, high-altitude clouds using radar-laser measurements collected over twenty years at NASA GSFC. Our findings show these clouds increasingly trap heat, partly because of shrinking snow and ice cover. This trend could further accelerate warming locally, underlining the need for accurate cloud observations to improve climate forecasts and strategies to respond to climate change.
25 Mar 2025
Understanding summertime H2O2 chemistry in North China Plain through observations and modelling studies
Can Ye, Pengfei Liu, Chaoyang Xue, Chenglong Zhang, Zhuobiao Ma, Chengtang Liu, Junfeng Liu, Keding Lu, Yujing Mu, and Yuanhang Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2025-795, https://doi.org/10.5194/egusphere-2025-795, 2025
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This study investigates H2O2 chemistry in rural North China. The observed H2O2 showed distinct diurnal variations influenced by photochemical reactions. A box model revealed that H2O2 is primarily produced by HO2 recombination and removed mainly via particle uptake. Reductions in NOx, PM2.5, and alkanes raised H2O2 levels, while cutting alkenes, aromatics, CO, and HONO lowered them. A dual strategy focusing on VOCs and NOx control is essential to reduce both H2O2 and ozone pollution.
25 Mar 2025
Quantifying the impact of solar zenith angle, cloud optical thickness, and surface albedo on the solar radiative effect of Arctic low-level clouds over open ocean and sea ice
Sebastian Becker, André Ehrlich, Michael Schäfer, and Manfred Wendisch
EGUsphere, https://doi.org/10.5194/egusphere-2025-1210, https://doi.org/10.5194/egusphere-2025-1210, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Clouds interact with solar radiation and can alter the surface temperature. The strength of this cloud impact is driven by cloud properties as well as solar elevation and surface reflection. Since these dependences are poorly represented in climate models, cloud, surface, and radiation observations are used to quantify the contributions of the drivers in the Arctic. It is shown that the weaker surface reflection dominates the stronger cooling effect of clouds over open ocean compared to sea ice.
25 Mar 2025
Constraining a Radiative Transfer Model with Satellite Retrievals: Implications for Cirrus Cloud Thinning
Ehsan Erfani and David L. Mitchell
EGUsphere, https://doi.org/10.5194/egusphere-2025-1165, https://doi.org/10.5194/egusphere-2025-1165, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Cirrus clouds play a key role in Earth’s climate by trapping heat. We use satellite data and radiative transfer modeling to explore how thinning these clouds could help cool the planet. It is shown that thinning cirrus clouds could significantly reduce warming, with the strongest effects in the polar regions during winter. These results improve our understanding of how clouds influence climate and could guide future efforts to combat global warming via climate intervention.
25 Mar 2025
Cloud-radiation interactions amplify ozone pollution in a warming climate
Shuyu Zhao, Tian Feng, Xuexi Tie, Biao Tian, Xiao Hu, Bo Hu, Dong Yang, Sinan Gu, and Minghu Ding
EGUsphere, https://doi.org/10.5194/egusphere-2025-682, https://doi.org/10.5194/egusphere-2025-682, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study investigated how cloud-radiation interactions influence ozone formation in a warming climate. Using measurements, reanalysis data and models, we found that cloud-radiation interactions can worsen O3 pollution and climate warming will amplify the influence. We highlight that climate change will pose greater challenges for China’s O3 pollution prevention and control, and actions such as reducing O3 precursors emissions and mitigating climate change are urgently needed.
25 Mar 2025
XCO2 observations compared to km-scale ICON-ART simulations indicate an underestimation of Thessaloniki’s emissions in the ODIAC inventory
Lena Feld, Pablo Schmid, Marios Mermigkas, Dimitrios Balis, Jochen Gross, Darko Dubravica, Carlos Alberti, Benedikt Herkommer, Stefan Versick, Roland Ruhnke, Frank Hase, and Peter Braesicke
EGUsphere, https://doi.org/10.5194/egusphere-2025-639, https://doi.org/10.5194/egusphere-2025-639, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Our goal is to measure CO2 emissions from cities, to verify and improve our knowledge of reported anthropogenic emissions. We use atmospheric measurements and simulations of CO2 transport to find an independent estimate. This study investigates the CO2 emissions of the city of Thessaloniki, where the reported emissions differ. The data we collected indicates that the emissions are larger than stated by the ODIAC inventory, which we used for our simulations.
25 Mar 2025
Covariability of dynamics and composition in the Asian monsoon tropopause layer from satellite observations and reanalysis products
Shenglong Zhang, Jiao Chen, Jonathon S. Wright, Sean M. Davis, Jie Gao, Paul Konopka, Ninghui Li, Mengqian Lu, Susann Tegtmeier, Xiaolu Yan, Guang J. Zhang, and Nuanliang Zhu
EGUsphere, https://doi.org/10.5194/egusphere-2025-543, https://doi.org/10.5194/egusphere-2025-543, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study examines water vapor changes in the upper atmosphere above the Asian summer monsoon using satellite data and climate models. Three key patterns of variability were identified: year-to-year changes, and two shifting distributions driven by weather and monsoon dynamics. Despite uncertainties, modern models are improving in capturing these processes. This enhances understanding of water vapor’s role in the upper atmosphere.
24 Mar 2025
Sectoral attribution of greenhouse gas and pollutant emissions using multi-species eddy covariance on a tall tower in Zurich, Switzerland
Rainer Hilland, Josh Hashemi, Stavros Stagakis, Dominik Brunner, Lionel Constantin, Natascha Kljun, Betty Molinier, Samuel Hammer, Lukas Emmenegger, and Andreas Christen
EGUsphere, https://doi.org/10.5194/egusphere-2025-1088, https://doi.org/10.5194/egusphere-2025-1088, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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We present a study of simultaneously measured fluxes of carbon dioxide (CO2) and co-emitted species in the city of Zurich. Flux measurements of CO2 alone can’t be attributed to specific emission sectors, such as road transport or residential heating. We present a model which uses the measured ratios of CO2 to carbon monoxide (CO) and nitrogen oxides (NOx) as well as sector-specific reference ratios, to attribute measured fluxes to their emission sectors.
24 Mar 2025
Stratospheric aerosol formed from the boiling sea induced by the 2022 Hunga Ha’apai volcanic eruption
Bengt G. Martinsson, Johan Friberg, and Moa K. Sporre
EGUsphere, https://doi.org/10.5194/egusphere-2025-971, https://doi.org/10.5194/egusphere-2025-971, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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The highly variable stratospheric aerosol bears great importance for Earth's climate. The one-year average aerosol load from the 2022 volcanic eruption in Hunga Tonga is the highest since the 1991 Mt. Pinatubo eruption. The usual volcanic aerosol precursor gas (SO2) mass was not sufficient to explain the aerosol load. Volcaniclastic density current in runouts exceeding 100 km amplified the eruption and bubble-bursting in the boiling sea forms a plausible explanation for high aerosol loading.
24 Mar 2025
Comment on "Can uncertainty in climate sensitivity be narrowed further?" by Sherwood and Forest (2024)
Nicholas Lewis
EGUsphere, https://doi.org/10.5194/egusphere-2025-1179, https://doi.org/10.5194/egusphere-2025-1179, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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The Opinion article that this Comment concerns challenged a 2022 study by this Comment's author that found a narrower and lower ECS level than a very influential 2020 study that had the same lead author as the Opinion article. This Comment shows that claims made in the Opinion article about that 2022 study are not true, explains why the Subjective Bayesian statistical methods favoured in the Opinion article are unreliable, and discusses structural uncertainties in climate models.
24 Mar 2025
The sources and diurnal variations of submicron aerosols in a coastal-rural environment near Houston, US
Jing Li, Jiaoshi Zhang, Xianda Gong, Steven Spielman, Chongai Kuang, Ashish Singh, Maria A. Zawadowicz, Lu Xu, and Jian Wang
EGUsphere, https://doi.org/10.5194/egusphere-2025-726, https://doi.org/10.5194/egusphere-2025-726, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Using measurements at a rural coastal site, we quantified aerosols in representative air masses and identified major source of organics in Houston area. Our results show cooking aerosol is likely overestimated by earlier studies. Additionally, diurnal variation of highly oxidized organics is mostly driven by air mass changes instead of photochemistry. This study highlights the impacts of emissions, atmospheric chemistry, and meteorology on aerosol properties in the coastal-rural environment.
21 Mar 2025
The Biogeophysical Effects of Carbon Fertilization of the Terrestrial Biosphere
Robert James Allen
EGUsphere, https://doi.org/10.5194/egusphere-2025-32, https://doi.org/10.5194/egusphere-2025-32, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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CMIP6 models are analyzed to quantify the biogeophysical (non-carbon cycle) and biogeochemical (enhanced carbon storage) effects of carbon fertilization at the time of CO2 quadrupling. The biogeophysical effects lead to relatively weak warming (0.16 ± 0.09 K ) largely due to decreases in surface latent heat flux associated with reduced canopy transpiration. Biogeochemical cooling associated with enhanced land carbon storage dominates at -1.38 K (-1.92 to -0.84 K).
21 Mar 2025
Towards an improved understanding of the impact of clouds and precipitation on the representation of aerosols over the Boreal Forest in GCMs
Sini Talvinen, Paul Kim, Emanuele Tovazzi, Eemeli Holopainen, Roxana Cremer, Thomas Kühn, Harri Kokkola, Zak Kipling, David Neubauer, João C. Teixeira, Alistair Sellar, Duncan Watson-Parris, Yang Yang, Jialei Zhu, Srinath Krishnan, Annele Virtanen, and Daniel G. Partridge
EGUsphere, https://doi.org/10.5194/egusphere-2025-721, https://doi.org/10.5194/egusphere-2025-721, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Climate models struggle to predict how clouds and aerosols interact, affecting Earth’s energy balance. This study compares models to observations to see how they describe effects of clouds and rain on aerosols. While both models show similar overall trends, seasonal differences emerged. These, however, align with differences in key variables participating in cloud formation. The study provides tools to improve the representation of aerosol-cloud interactions in climate models.
21 Mar 2025
Underestimation of atmospheric oxidized mercury at a mountaintop site by the GEOS-Chem chemical transport model
Tyler R. Elgiar, Lynne Gratz, A. Gannet Hallar, Rainer Volkamer, and Seth N. Lyman
EGUsphere, https://doi.org/10.5194/egusphere-2025-977, https://doi.org/10.5194/egusphere-2025-977, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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This manuscript compares verified atmospheric mercury measurements against output from the GEOS-Chem 3D photochemical transport model. It shows that the model is unable to reproduce measured atmospheric oxidized mercury concentrations, even in several cases where oxidation rates in the model are enhanced.
20 Mar 2025
Evaluation of the uncertainty of the spectral UV irradiance measured by double- and single-monochromator Brewer spectroradiometers
Carmen González, José Manuel Vilaplana, Alberto Redondas, Javier López-Solano, José María San Atanasio, Richard Kift, Andrew R. D. Smedley, Pavel Babal, Ana Díaz, Nis Jepsen, Guisella Gacitúa, and Antonio Serrano
EGUsphere, https://doi.org/10.5194/egusphere-2025-490, https://doi.org/10.5194/egusphere-2025-490, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Brewer spectroradiometers are widely used instruments that have been monitoring global solar ultraviolet (UV) irradiance since the 1990s, playing a key role in solar UV research. The uncertainties of these measurements are rarely evaluated even though they are essential to determine the quality of these measurements. In this work, the uncertainty of ten Brewers is estimated using the Monte Carlo method, showing that Brewer’s relative uncertainty is less than 5 % for wavelengths above 300 nm.
20 Mar 2025
A thousand inversions to determine European SF6 emissions from 2005 to 2021
Martin Vojta, Andreas Plach, Rona L. Thompson, Pallav Purohit, Kieran Stanley, Simon O’Doherty, Dickon Young, Joe Pitt, Xin Lan, and Andreas Stohl
EGUsphere, https://doi.org/10.5194/egusphere-2025-1095, https://doi.org/10.5194/egusphere-2025-1095, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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We determine European emissions of the highly potent greenhouse gas sulfur hexafluoride from 2005 to 2021 – focusing on high-emitting countries and the aggregated EU-27 emissions. Emissions declined in most regions, likely due to EU F-gas regulations. However, our results reveal that most studied countries underestimate their emissions in their national reports. Our sensitivity tests highlight the importance of dense observational networks for reliable inversion-based emission estimates.
20 Mar 2025
Is the summer aerosol over the Arctic controlled by regional atmospheric circulation or ice conditions? Trends and Future Implications
Caroline Leck, Jost Heintzenberg, Tiina Nygård, and Tuomas Naakka
EGUsphere, https://doi.org/10.5194/egusphere-2025-695, https://doi.org/10.5194/egusphere-2025-695, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Five summer cruises of the Swedish icebreaker Oden in the inner Arctic in 1990, 1996, 2001, 2008, and 2018 provided a unique dataset on the seasonal distribution of atmospheric aerosol. Coupling these data with the seasonal sea ice distribution strongly indicated a regional biogenic aerosol source during late summer and early autumn freeze-up conditions. Given the expected further warming of the Arctic, we hypothesize an increase in biogenic aerosol in late summer and autumn.
20 Mar 2025
Deciphering Dust Provenance and Transport Pathways Across Northern China's Source-Sink Systems
Lanying Han, Zhengyu Zhang, Aimin Liang, Junfeng Lu, Zhibao Dong, and Zhengcai Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2025-856, https://doi.org/10.5194/egusphere-2025-856, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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The study revealed three key findings by systematically quantifying dust sources using a combination of rare earth element characteristics and trace element ratios. Quantifying Gurbantungut dust into CLP solves the long-standing debate over the exaggerated role of Qaidam Basin. Reveals the dual role of the Alachan plateau as a terrain filter for direct Taklama dry dust, while amplifying Gurbantunggut flux through terrain uplift. Taklimakan dust was identified as the main source of the CLP.
20 Mar 2025
Evolution of aerosol optical depth over China in 2010–2024: increasing importance of meteorological influences
Cheng Fan, Gerrit de Leeuw, Xiaoxi Yan, Jiantao Dong, Hanqing Kang, Chengwei Fang, Zhengqiang Li, and Ying Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2025-880, https://doi.org/10.5194/egusphere-2025-880, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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This study describes the analysis of time series of the MODIS-derived Aerosol Optical Depth (AOD) over China between 2010 and 2024. Emission reduction policy has been effective in reducing the AOD until 2018. Thereafter the overall reduction until the end of the study was very small due to unfavorable meteorological factors cancelling favorable anthropogenic effects which resulted in AOD increase during extended periods. The variations over different areas in China are discussed.
20 Mar 2025
Measurement report: Simultaneous measurement on atmospheric gas- and aerosol-phase water-soluble organics in Shanghai: Remarkable increase in light absorbing of Asian dust aerosols during long-range transport
Zheng Li, Gehui Wang, Binyu Xiao, Rongjie Li, Can Wu, Shaojun Lv, Feng Wu, Qingyan Fu, and Yusen Duan
EGUsphere, https://doi.org/10.5194/egusphere-2025-654, https://doi.org/10.5194/egusphere-2025-654, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Gas-to-aerosol partitioning of organics were investigated in Shanghai during 2023 dust storm period. We found the partitioning coefficients (Fp) of WSOCs in DS were comparable to those during a haze episode (HE), and aerosol liquid water content primarily drove Fp variation in HE, while pH was the dominant factor in DS. Moreover, an enhanced light absorption of Asian dust by brown carbon, mainly in coarse mode, formation was revealed.
19 Mar 2025
Missing wintertime methane emissions from New York City related to combustion
Luke D. Schiferl, Andrew Hallward-Driemeier, Yuwei Zhao, Ricardo Toledo-Crow, and Róisín Commane
EGUsphere, https://doi.org/10.5194/egusphere-2025-345, https://doi.org/10.5194/egusphere-2025-345, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Accurate quantification and identification of methane sources to the atmosphere are key to meeting climate warming mitigation targets. Using rooftop observations, we find the methane emissions from New York City are larger and more variable across seasons and throughout the day than expected. The methane emissions are well correlated with emissions of carbon monoxide, which points to inefficient combustion from stationary sources as a potential missing source of methane emissions in this region.
19 Mar 2025
Effects of enhancing nitrogen use efficiency in cropland and livestock systems on agricultural ammonia emissions and particulate matter air quality in China
Biao Luo, Lei Liu, David H. Y. Yung, Tiangang Yuan, Jingwei Zhang, Leo T. H. Ng, and Amos P. K. Tai
EGUsphere, https://doi.org/10.5194/egusphere-2025-72, https://doi.org/10.5194/egusphere-2025-72, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Through a combination of emission models and air quality model, we aimed to address the pressing issue of poor nitrogen management while promoting sustainable food systems and public health in China. We discovered that improving nitrogen management of crop and livestock can substantially reduce air pollutant emissions, particularly in North China Plain. Our findings further provide the benefits of such interventions on PM2.5 reductions, offering valuable insights for policymakers.
19 Mar 2025
An uncertain future for the climate and health impacts of anthropogenic aerosols in Africa
Joe Adabouk Amooli, Marianne T. Lund, Sourangsu Chowdhury, Gunnar Myhre, Ane N. Johansen, Bjørn H. Samset, and Daniel M. Westervelt
EGUsphere, https://doi.org/10.5194/egusphere-2025-948, https://doi.org/10.5194/egusphere-2025-948, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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We analyze various projections of African aerosol emissions and their potential impacts on climate and public health. We find that future emissions vary widely across emission projections, with differences in sectoral emission distributions. Using the Oslo chemical transport model, we show that air pollution exposure in some regions of Africa could increase significantly by 2050, increasing pollution-related deaths, with most scenarios projecting aerosol-induced warming over sub-Saharan Africa.
19 Mar 2025
Operational and Probabilistic Evaluation of AQMEII-4 Regional Scale Ozone Dry Deposition. Time to Harmonise Our LULC Masks
Ioannis Kioutsioukis, Christian Hogrefe, Paul A. Makar, Ummugulsun Alyuz, Jessy O. Bash, Roberto Bellasio, Roberto Bianconi, Tim Buttler, Olivia E. Clifton, Philippe Cheung, Alma Hodzic, Richard Kranenburg, Aurelia Lupascu, Kester Momoh, Juan Luis Perez-Camaño, John Pleim, Young-Hee Ryu, Robero San Jose, Donna Schwede, Ranjeet Sokhi, and Stefano Galmarini
EGUsphere, https://doi.org/10.5194/egusphere-2025-1091, https://doi.org/10.5194/egusphere-2025-1091, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Deposition is a key in air quality modelling. An evaluation of the AQMEII4 models is performed prior to analysing the different deposition schemes in relation to the LULC used. Such analysis is unprecedented. Among the results, LULC masks have to be harmonised and up-to-date information used in place of outdated and too course masks. Alternatively LULC masks should be evaluated and intercom pared when multiple model results are analysed.
19 Mar 2025
A new production-based model for estimating emissions and banks of ODSs: Application to HCFC-141b
Helen Walter-Terrinoni, John S. Daniel, Chelsea R. Thompson, and Luke M. Western
EGUsphere, https://doi.org/10.5194/egusphere-2025-297, https://doi.org/10.5194/egusphere-2025-297, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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We have developed a model to improve our ability to estimate emissions of chemicals that are used as foam blowing agents. Some of these chemicals are ozone-depleting substances and some are greenhouse gases. For HCFC-141b, which is the focus of this study, we find that recent observations are inconsistent with our calculated emissions, with our emissions being lower. This mismatch is similar to previous findings and may have important implications for compliance with the Montreal Protocol.
18 Mar 2025
The Impact of the Stratospheric Quasi-Biennial Oscillation on Arctic Polar Stratospheric Cloud Occurrence
Douwang Li, Zhe Wang, Siyi Zhao, Jiankai Zhang, Wuhu Feng, and Martyn P. Chipperfield
EGUsphere, https://doi.org/10.5194/egusphere-2025-955, https://doi.org/10.5194/egusphere-2025-955, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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We find that wind variations at the equator (QBO) modulate the occurrence of Arctic polar stratospheric clouds (PSCs), which are key contributors to ozone depletion. During westerly QBO, the PSC occurrence is significantly greater than during easterly QBO. The QBO affects PSC mainly through temperature, while H2O and HNO3 have less effect. This suggests that future climate change may affect ozone recovery if it alters the QBO pattern. This study provides a new perspective on ozone prediction.
18 Mar 2025
Nonlinear effects of the stratospheric Quasi‐Biennial Oscillation on ENSO modulating PM2.5 over the North China Plain in early winter
Xiadong An, Wen Chen, Tianjiao Ma, and Lifang Sheng
EGUsphere, https://doi.org/10.5194/egusphere-2025-285, https://doi.org/10.5194/egusphere-2025-285, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Air pollution in the North China Plain is tends to be influenced by El Niño-Southern Oscillation (ENSO) and stratospheric Quasi-Biennial Oscillation (QBO). During El Niño and easterly QBO, pollution rises, while La Niña and easterly QBO improve air quality through changes in atmospheric circulation and weather conditions.
17 Mar 2025
Isentropic Mixing vs. Convection in CLaMS-3.0/MESSy: Evaluation Using Satellite Climatologies and In Situ Carbon Monoxide Observations
Paul Konopka, Felix Ploeger, Francesco D'Amato, Teresa Campos, Marc von Hobe, Shawn B. Honomichl, Peter Hoor, Laura L. Pan, Michelle L. Santee, Silvia Viciani, Kaley A. Walker, and Michaela I. Hegglin
EGUsphere, https://doi.org/10.5194/egusphere-2025-1155, https://doi.org/10.5194/egusphere-2025-1155, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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We present an improved version of the Chemical Lagrangian Model of the Stratosphere (CLaMS-3.0), which better represents transport from the lower atmosphere to the upper troposphere and lower stratosphere. By refining grid resolution and improving convection representation, the model more accurately simulates carbon monoxide transport. Comparisons with satellite and in situ observations highlight its ability to capture seasonal variations and improve our understanding of atmospheric transport.
17 Mar 2025
Anthropogenic air pollutants strongly interact with natural aerosols over the eastern China seas: key processes, size distributions, and seasonalities
Shengqian Zhou, Zongjun Xu, Ying Chen, Mingtao Zhao, Yifei Li, and Ke Yan
EGUsphere, https://doi.org/10.5194/egusphere-2025-678, https://doi.org/10.5194/egusphere-2025-678, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Continental outflows from East Asia significantly impact marine aerosols and ecosystems. This study examines aerosol composition and size distribution over the eastern China seas across four seasons, revealing how anthropogenic pollutants interact with natural aerosols. The strong effects of these interactions on nitrogen partitioning, dust composition, and sea salt chloride depletion are quantified, with implications for understanding nutrient deposition and coastal ozone chemistry.
17 Mar 2025
Technical note: Towards a stronger observational support for haze pollution control by interpreting carbonaceous aerosol results derived from different measurement approaches
Yuan Cheng, Ying-jie Zhong, Zhi-qing Zhang, Xu-bing Cao, and Jiu-meng Liu
EGUsphere, https://doi.org/10.5194/egusphere-2025-537, https://doi.org/10.5194/egusphere-2025-537, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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As an emerging hotspot of atmospheric sciences, Northeast China is distinct due to the frigid winter and the strong emissions from agricultural fires. Based on field campaigns conducted in Harbin, we successively identified the analytical method that could lead to proper results of organic and elemental carbon. Our results are believed to be a support for future efforts on exploration of the PM2.5 sources in Northeast China, which are essential for further improving the regional air quality.
17 Mar 2025
Life cycle studies and liquid-phase characterization of Arctic mixed-phase clouds: MOSAiC 2019–2020 results
Cristofer Jimenez, Albert Ansmann, Kevin Ohneiser, Hannes Griesche, Ronny Engelmann, Martin Radenz, Julian Hofer, Dietrich Althausen, Daniel Alexander Knopf, Sandro Dahlke, Johannes Bühl, Holger Baars, Patric Seifert, and Ulla Wandinger
EGUsphere, https://doi.org/10.5194/egusphere-2025-967, https://doi.org/10.5194/egusphere-2025-967, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Using advanced remote sensing on the icebreaker Polarstern, we studied mixed-phase clouds (MPCs) in the central Arctic during the 2019–2020 MOSAiC (Multidisciplinary drifting Observatory for the Study of Arctic Climate) campaign. For the first time, lidar and radar techniques tracked the year-round evolution of liquid and ice phases in MPCs. The study provides cloud statistics and explores key processes driving cloud longevity, offering new insights into Arctic cloud formation and persistence.
17 Mar 2025
SOA yields from C10 alkanes and oxygenates and their relation to highly oxygenated organic molecules (HOM)
Frans Graeffe, Kalle Kupi, Hilkka Timonen, and Mikael Ehn
EGUsphere, https://doi.org/10.5194/egusphere-2025-910, https://doi.org/10.5194/egusphere-2025-910, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Alkanes are a major part of anthropogenic emissions in urban areas, and known for being capable of producing secondary organic aerosol (SOA). We measured SOA yields of seven alkanes and their oxygenated derivatives in oxidation flow reactor measurements to assess their role in SOA formation. In addition to quantified SOA yields, we observed that cyclic structure enhances SOA production. Furthermore, our observations indicate that multi-generational OH oxidation is important in the SOA formation.
17 Mar 2025
Rapid near-term warming in a carbon neutral future attributed to substantial aerosol decline
Yang Yang, Li You, Hailong Wang, Huimin Li, Pinya Wang, and Hong Liao
EGUsphere, https://doi.org/10.5194/egusphere-2025-840, https://doi.org/10.5194/egusphere-2025-840, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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This study used machine learning to predict global and regional temperature changes under carbon neutrality and high emissions from 2015 to 2100.The results show that while carbon neutrality slows long-term warming, it causes short-term warming due to the rapid decline in aerosols. In contrast, greenhouse gases dominate warming in the high-emission scenario. These findings emphasize the important role of aerosols in shaping near-term climate change under carbon-neutral pathways.
17 Mar 2025
Influence of Secondary Ice Production on cloud and rain properties: Analysis of the HYMEX IOP7a Heavy Precipitation Event
Pierre Grzegorczyk, Wolfram Wobrock, Aymeric Dziduch, and Céline Planche
EGUsphere, https://doi.org/10.5194/egusphere-2025-819, https://doi.org/10.5194/egusphere-2025-819, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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The impact of secondary ice production (SIP) on a HYMEX intense precipitation event is investigated using 3D bin microphysics. Including SIP improves agreement with in situ aircraft observations (ice crystal number concentration and supercooled drop number fraction), generates small ice crystals and redistributes condensed water mass toward smaller particle sizes. As these crystals melt, the liquid precipitation flux decreases, reducing total precipitation by 8 % and heavy rainfall by 20 %.
17 Mar 2025
Influencing Factors of Gas-Particle Distribution of Oxygenated Organic Molecules in Urban Atmosphere and its Deviation from Equilibrium Partitioning
Xinyu Wang, Nan Chen, Bo Zhu, and Huan Yu
EGUsphere, https://doi.org/10.5194/egusphere-2025-229, https://doi.org/10.5194/egusphere-2025-229, 2025
Preprint under review for ACP (discussion: open, 3 comments)
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Gas-to-particle partitioning governs the fate of organic molecules and the formation of organic aerosols in the atmosphere. Based on field measurement data, we built machine learning models to predict gas-to-particle partitioning. We also unveiled previously unrecognized interactions that lead to the deviations of partitioning from equilibrium state under real atmospheric conditions. Our study provided valuable insights for future research in atmospheric chemistry.
17 Mar 2025
Unraveling Arctic submicron organic aerosol sources: a year-long study by H-NMR and AMS in Ny-Ålesund, Svalbard
Marco Paglione, Yufang Hao, Stefano Decesari, Mara Russo, Karam Mansour, Mauro Mazzola, Diego Fellin, Andrea Mazzanti, Emilio Tagliavini, Manousos Ioannis Manousakas, Evangelia Diapouli, Elena Barbaro, Matteo Feltracco, Kaspar Rudolf Daellenbach, and Matteo Rinaldi
EGUsphere, https://doi.org/10.5194/egusphere-2025-760, https://doi.org/10.5194/egusphere-2025-760, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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A year-long set of PM1 samples from Ny-Ålesund, Svalbard, was analyzed by H-NMR and HR-TOF-AMS for the chemical characterization of the organic fraction. Positive Matrix Factorization allowed to identify five organic aerosol sources with specific seasonality. Winter-spring aerosol is dominated by Eurasian pollution, while summer is characterized by biogenic aerosols from marine sources; occasional summertime high OA loadings are associated with wildfire aerosols.
14 Mar 2025
Trends in the erythemal radiant exposure from re-evaluated measurements (1976–2023) with biometers at Belsk, Poland, and their sources from corresponding ozone, aerosol, and cloud observations
Agnieszka Czerwińska, Janusz Krzyścin, Janusz Jarosławski, Piotr S. Sobolewski, and Aleksander Pietruczuk
EGUsphere, https://doi.org/10.5194/egusphere-2025-1129, https://doi.org/10.5194/egusphere-2025-1129, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Excessive levels of ultraviolet solar radiation at the Earth's surface have been linked to several types of skin cancer. The world's longest record of solar radiation intensities causing harmful skin redness comes from observations at Belsk, Poland, between 1976 and 2023. In this century, the intensity of such radiation is stable, but 15 % higher than in the 1970s. This trend is due to the combined effects of a decrease in stratospheric ozone and an increase in cloud transparency before 2000.
14 Mar 2025
Atmospheric Boundary Layer in the Atlantic: the desert dust impact
Ioanna Tsikoudi, Eleni Marinou, Maria Tombrou, Eleni Giannakaki, Emmanouil Proestakis, Konstantinos Rizos, Ville Vakkari, and Vassilis Amiridis
EGUsphere, https://doi.org/10.5194/egusphere-2025-1105, https://doi.org/10.5194/egusphere-2025-1105, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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The lowest part of the atmosphere plays a critical role in weather and climate. Using groundbased and space lidar, radiosondes and model data, we analyzed how dust and local wind conditions influence its height over the tropical Atlantic. We found that different conditions, as well as different methods yield varying results, highlighting challenges in defining the boundary layer top. Understanding these differences improves climate models and our knowledge of atmospheric dynamics in this region.
14 Mar 2025
Investigating the ability of satellite occultation instruments to monitor possible geoengineering experiments
Anna Lange, Ulrike Niemeier, Alexei Rozanov, and Christian von Savigny
EGUsphere, https://doi.org/10.5194/egusphere-2025-1005, https://doi.org/10.5194/egusphere-2025-1005, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Our paper investigates whether it is possible to observe injections of 1 and 2 Tg S/y (sulphur per year) into the stratosphere with the currently active satellite occultation instruments. The calculations show that, considering the natural variability and the assumptions made here, the stratospheric aerosols formed from emissions of 1 and 2 Tg S/y in the quasi steady-state phase can be detected, which is not the case in the first month of the two-year initial phase.
14 Mar 2025
Role of in situ-excited planetary waves in polar vortex splitting during the 2002 Southern Hemisphere sudden stratospheric warming event
Ji-Hee Yoo and Hye-Yeong Chun
EGUsphere, https://doi.org/10.5194/egusphere-2025-748, https://doi.org/10.5194/egusphere-2025-748, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study revisits the Southern Hemisphere’s only major sudden stratospheric warming in September 2002, marked by an unprecedented polar vortex split. In addition to upward-propagating planetary wave 2 (PW2), westward PW2 generated in situ by barotropic–baroclinic instability, contributed to the vortex split. Unstable PW2 growth resulted from nonlinear wave-wave interactions and over-reflection. Vortex destabilization occurred as the anomalously poleward-shifted vortex reversed to easterlies.
14 Mar 2025
Distinct structures of interannual variations in stratosphere-to-troposphere ozone transport induced by the Tibetan Plateau thermal forcing
Qingjian Yang, Tiangliang Zhao, Yongqing Bai, Kai Meng, Yuehan Luo, Zhijie Tian, Xiaoyun Sun, Weikang Fu, Kai Yang, and Jun Hu
EGUsphere, https://doi.org/10.5194/egusphere-2025-737, https://doi.org/10.5194/egusphere-2025-737, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study reveals a unique driver of the Tibetan Plateau (TP) thermal forcing on the interannual variations in stratosphere-to-troposphere transport (STT) of ozone with diverse structures. Anomalous strong TP thermal forcing induces anticyclonic anomalies in the upper troposphere over the TP, which strengthens and attenuates the northern and southern branches of the westerly jet, intensifying and weakening the westerly trough for more (less) tropopause folds of ozone STT over East Asian region.
14 Mar 2025
Application of PRIM for understanding patterns in carbon dioxide model-observation differences
Tobias Gerken, Kenneth J. Davis, Klaus Keller, and Sha Feng
EGUsphere, https://doi.org/10.5194/egusphere-2025-341, https://doi.org/10.5194/egusphere-2025-341, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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We apply the Patient Rule Induction Method (PRIM) technique to airborne CO2 and meteorological data to better understand atmospheric conditions and implications for carbon dioxide model-observation-mismatches. We found PRIM is capable of separating observations from different seasons and levels based on atmospheric conditions. Large magnitude carbon dioxide model-observation-differences were associated with non-typical atmospheric conditions, with implications for transport model evaluation.
13 Mar 2025
Quantifying CO emissions from boreal wildfires by assimilating TROPOMI and TCCON observations
Sina Voshtani, Dylan B. A. Jones, Debra Wunch, Drew C. Pendergrass, Paul O. Wennberg, David F. Pollard, Isamu Morino, Hirofumi Ohyama, Nicholas M. Deutscher, Frank Hase, Ralf Sussmann, Damien Weidmann, Rigel Kivi, Omaira García, Yao Té, Jack Chen, Kerry Anderson, Robin Stevens, Shobha Kondragunta, Aihua Zhu, Douglas Worthy, Senen Racki, Kathryn McKain, Maria V. Makarova, Nicholas Jones, Emmanuel Mahieu, Andrea Cadena-Caicedo, Paolo Cristofanelli, Casper Labuschagne, Elena Kozlova, Thomas Seitz, Martin Steinbacher, Reza Mahdi, and Isao Murata
EGUsphere, https://doi.org/10.5194/egusphere-2025-858, https://doi.org/10.5194/egusphere-2025-858, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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We assess the complementarity of the greater temporal coverage provided by ground-based remote sensing data with the spatial coverage of satellite observations when these data are used together to quantify CO emissions from extreme wildfires in 2023. Our results reveal that the commonly used biomass burning emission inventories significantly underestimate the fire emissions and emphasize the importance of the ground-based remote sensing data in reducing uncertainties in the estimated emissions.
13 Mar 2025
Tropospheric ozone responses to the El Niño-Southern Oscillation (ENSO): quantification of individual processes and future projections from multiple chemical models
Jingyu Li, Haolin Wang, Qi Fan, and Xiao Lu
EGUsphere, https://doi.org/10.5194/egusphere-2025-782, https://doi.org/10.5194/egusphere-2025-782, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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We use multiple global chemical models to quantify processes contributing the ozone response to ENSO. We find that changes in transport patterns are the dominant factor in the overall ozone-ENSO responses, with the opposing effects of chemical depletion and increased biomass burning on ozone largely offsetting each other. Models consistently project an increase in tropical ozone-ENSO response associated with strengthening anomalous circulation and more abundant water vapor with global warming.
13 Mar 2025
Potential contribution to secondary aerosols from benzothiazoles in the atmospheric aqueous phase based on oxidation and oligomerization mechanisms
Qun Zhang, Wei Zhou, Shanshan Tang, Kai Huang, Jie Fu, Zechen Yu, Yunhe Teng, Shuyi Shen, Yang Mei, Xuezhi Yang, Jianjie Fu, and Guibin Jiang
EGUsphere, https://doi.org/10.5194/egusphere-2025-1028, https://doi.org/10.5194/egusphere-2025-1028, 2025
Preprint under review for ACP (discussion: open, 3 comments)
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This article comprehensively investigates the aqueous-phase OH oxidation of benzothiazoles (BTs), common rubber additives found in urban air, through laboratory simulation experiments. BTs can rapidly degrade, leading to light absorption, high yields of sulfate, and the formation of highly oxidized and/or oligomerized organic compounds. The results reveal that aqueous-phase BTs can contribute to secondary aerosols, altering the chemical and optical properties of atmospheric particles.
13 Mar 2025
Development of a parametrised atmospheric NOx chemistry scheme to help quantify fossil fuel CO2 emission estimates
Chlöe Natasha Schooling, Paul I. Palmer, Auke Visser, and Nicolas Bousserez
EGUsphere, https://doi.org/10.5194/egusphere-2024-3949, https://doi.org/10.5194/egusphere-2024-3949, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study presents a new method to estimate fossil fuel CO2 (ffCO2) emissions by modelling NOx chemistry. Our regression models predict NOx chemical rates and NO2:NO ratios with R² values above 0.95 using meteorological inputs. Incorporating these regressions reduces computational time compared to traditional methods and enables integration into model inversion frameworks. This scalable approach supports global emissions monitoring and climate change mitigation efforts.
12 Mar 2025
The impacts of secondary ice production on the microphysics and dynamics of mid-latitude cold season convection
Zhipeng Qu, Alexei Korolev, Jason A. Milbrandt, Ivan Heckman, Mélissa Cholette, Cuong Nguyen, and Mengistu Wolde
EGUsphere, https://doi.org/10.5194/egusphere-2025-649, https://doi.org/10.5194/egusphere-2025-649, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study examines the impact of incorporating secondary ice production (SIP) parameterizations into high-resolution numerical weather prediction simulations for mid-latitude continental winter conditions. Aircraft in situ and remote sensing observations are used to evaluate the simulations. Results show that including SIP improves the representation of cloud and freezing rain properties, with its impact varying based on cloud regime, such as convective or stratiform.
12 Mar 2025
Unveiling single-particle composition, size, shape, and mixing state of freshly emitted Icelandic dust via electron microscopy analysis
Agnesh Panta, Konrad Kandler, Kerstin Schepanski, Andres Alastuey, Pavla Dagsson Waldhauserova, Sylvain Dupont, Melanie Eknayan, Cristina González-Flórez, Adolfo González-Romero, Martina Klose, Mara Montag, Xavier Querol, Jesús Yus-Díez, and Carlos Pérez García-Pando
EGUsphere, https://doi.org/10.5194/egusphere-2025-494, https://doi.org/10.5194/egusphere-2025-494, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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Iceland is among the most active dust source areas in the world. Dust properties are influenced by particle size, mineralogy, shape, and mixing state. This work characterizes freshly emitted individual aerosol particles of Icelandic dust using electron microscopy. Our study provides insights into critical particle-specific information will contribute to better constraining climate models that consider mineralogical variations in their representation of the dust cycle.
12 Mar 2025
Synoptic and microphysical lifetime constraints for contrails
Sina Maria Hofer and Klaus Martin Gierens
EGUsphere, https://doi.org/10.5194/egusphere-2025-326, https://doi.org/10.5194/egusphere-2025-326, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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The climate effect of contrails depends on contrail lifetime. Thus, it is important to know what constrains the lifetime. In this paper we characterize the two most important contrail dissolution processes via their respective time-scales. Both time-scales are in the order of a couple of hours, depending on the synoptic situation and the size of the contrail ice crystals. The combined time-scale which combines both processes is the harmonic mean of the two single time-scales.
11 Mar 2025
Distinct effects of several ice production processes on thunderstorm electrification and lightning activity
Inès Vongpaseut and Christelle Barthe
EGUsphere, https://doi.org/10.5194/egusphere-2025-214, https://doi.org/10.5194/egusphere-2025-214, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Three idealized storms that differ by their cloud base temperature were simulated in order to assess the impact of ice production on cloud electrical activity. Ice production is impacted by aerosols that either can form cloud droplets or ice crystals and processes that form ice crystals from pre-existing cloud particles. All those processes can interact and affect the electrical activity and differently according to the cloud conditions.
11 Mar 2025
Northern Hemisphere Stratospheric Temperature Response to External Forcing in Decadal Climate Simulations
Abdullah A. Fahad, Andrea Molod, Krzysztof Wargan, Dimitris Menemenlis, Patrick Heimbach, Atanas Trayanov, Ehud Strobach, and Lawrence Coy
External preprint server, https://doi.org/10.21203/rs.3.rs-1892797/v2, https://doi.org/10.21203/rs.3.rs-1892797/v2, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study used a 1-degree GEOS-MITgcm coupled GCM to analyze the Northern Hemisphere (NH) stratospheric temperature response to external forcing. Results show the NH polar stratospheric temperature increased from 1992 to 2000, contrary to the expectation of stratospheric cooling with rising CO2. However, from 2000 to 2020, the temperature decreased. The study concluded that changes in CO2 and Ozone drive the meridional eddy transport of heat, dictating polar stratospheric temperature behavior.
11 Mar 2025
Gas-phase collision rate enhancement factors for acid-base clusters up to 2 nm in diameter from atomistic simulation and the interacting hard sphere model
Valtteri Tikkanen, Huan Yang, Hanna Vehkamäki, and Bernhard Reischl
EGUsphere, https://doi.org/10.5194/egusphere-2025-507, https://doi.org/10.5194/egusphere-2025-507, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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Collisions of neutral molecules and clusters is the prevalent pathway in atmospheric new particle formation. In heavily polluted urban areas, where clusters are formed rapidly and in large number, cluster-cluster collisions also become relevant. We calculate cluster-cluster collision rates from atomistic molecular dynamics simulations and an interacting hard sphere model. Not accounting for long-range attractive interactions underestimates collision and particle formation rates significantly.
10 Mar 2025
Biomass Burning Aerosol Radiative Effects in the Southeast Atlantic Depend Strongly on Meteorological Forcing Method
Eric Giuffrida, Kate Johnson, Tyler Tatro, Paquita Zuidema, and Hamish Gordon
EGUsphere, https://doi.org/10.5194/egusphere-2025-511, https://doi.org/10.5194/egusphere-2025-511, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Smoke aerosols emitted from summer African fires periodically travel across the ocean and interact with one of Earth’s largest permanent cloud decks. Researchers quantify the heating and cooling effects of this interaction using climate models. However, the use of different historical weather matching methods has produced a large variation in results. Here we test method variations commonly used today, and conclude on new guidelines for achieving the most accurate results.
10 Mar 2025
Contributions of lightning to long-term trends and inter-annual variability in global atmospheric chemistry constrained by Schumann Resonance observations
Xiaobo Wang, Yuzhong Zhang, Tamás Bozóki, Ruosi Liang, Xinchun Xie, Shutao Zhao, Rui Wang, Yujia Zhao, and Shuai Sun
EGUsphere, https://doi.org/10.5194/egusphere-2025-370, https://doi.org/10.5194/egusphere-2025-370, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Schumann Resonance observations are used to parameterize lightning NOx emissions for better capturing global lightning trend and variability. Updated simulations reveal insignificant trend but greater variability in lightning NOx emissions, impacting tropospheric NOx, O3 and OH. Lightning generally counteracts non-lightning factors, reducing the inter-annua variability of tropospheric O3 and OH. Variations of global lightning play important role in understanding the atmospheric methane budget.
10 Mar 2025
Mid-Atlantic U.S. observations of radiocarbon in CO2: fossil and biogenic source partitioning and model evaluation
Bianca C. Baier, John B. Miller, Colm Sweeney, Scott Lehman, Chad Wolak, Joshua P. DiGangi, Yonghoon Choi, Kenneth Davis, Sha Feng, and Thomas Lauvaux
EGUsphere, https://doi.org/10.5194/egusphere-2025-821, https://doi.org/10.5194/egusphere-2025-821, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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CO2 radiocarbon content (Δ14CO2) is a unique tracer helps to accurately quantify anthropogenic CO2 emitted into the atmosphere. Δ14CO2 measured in airborne flask samples is used to distinguish fossil versus biogenic CO2 sources. Mid-Atlantic U.S. CO2 variability is found to be driven by the biosphere. Errors in modeled fossil fuel CO2 are evaluated using Δ14CO2 airborne data as an avenue to improving future regional models of atmospheric CO2 transport.
07 Mar 2025
Atmospheric breakdown kinetics and air quality impact of potential “green” solvents the oxymethylene ethers OME3 and OME4
James D. D'Souza Metcalf, Ruth K. Winkless, Caterina Mapelli, C. Rob McElroy, Claudiu Roman, Cecilia Arsene, Romeo I. Olariu, Iustinian G. Bejan, and Terry J. Dillon
EGUsphere, https://doi.org/10.5194/egusphere-2025-866, https://doi.org/10.5194/egusphere-2025-866, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Oxymethylene ethers are a class of sustainable compounds that could be used to replace harmful organic solvents in a range of applications. In this work we used lab-based experiments to identify the main breakdown routes of these compounds in the atmosphere. We have determined that they likely contribute less to air pollution than the compounds that they replace.
07 Mar 2025
Reaction between perfluoroaldehydes and hydroperoxy radical in the atmosphere: Reaction mechanisms, reaction kinetics modelling, and atmospheric implications
Zegang Dong, Chaolu Xie, and Bo Long
EGUsphere, https://doi.org/10.5194/egusphere-2024-4179, https://doi.org/10.5194/egusphere-2024-4179, 2025
Preprint under review for ACP (discussion: open, 3 comments)
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Perfluoroaldehydes are important products formed in the atmospheric oxidation of fluorinated compounds. However, their degradation routes are not clear. Here, we find a rapid route for the degradation of linear perfluoroaldehydes by hydroperoxy radical. The chemical processes are dominant over the corresponding oxidation processes by hydroxyl radical. The present findings are of great importance for elucidating the chemical transformation of linear perfluoroaldehydes in the atmosphere.
07 Mar 2025
The Critical Role of Volatile Organic Compounds Emission in Nitrate Formation in Lhasa, Tibetan Plateau: Insights from Oxygen Isotope Anomaly Measurements
Xueqin Zheng, Junwen Liu, Nima Chuduo, Bian Ba, Pengfei Yu, Phu Drolgar, Fang Cao, and Yanlin Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2025-164, https://doi.org/10.5194/egusphere-2025-164, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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In this study, we present the first report on the annual variation of stable oxygen isotope anomalies (∆17O = δ17O - 0.52 × δ18O) in NO3- collected from the urban area of Lhasa , on the Tibetan Plateau, China. Using a Bayesian isotope mixture model, we found that the relative contribution of the NO3+VOC pathway to NO3- formation in spring in Lhasa was several times higher than in urban cities, highlighting the significant influence of VOC transported from outside the Tibetan Plateau.
06 Mar 2025
Amazon rainforest ecosystem exchange of CO2 and H2O through turbulent understory ejections
Robbert Petrus Johannes Moonen, Getachew Agmuas Adnew, Jordi Vilà-Guerau de Arellano, Oscar Karel Hartogensis, David Joan Bonell Fontas, Shujiro Komiya, Sam P. Jones, and Thomas Röckmann
EGUsphere, https://doi.org/10.5194/egusphere-2025-452, https://doi.org/10.5194/egusphere-2025-452, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Understory ejections are distinct turbulent features emerging in prime tall forest ecosystems. We share a method to isolate understory ejections based on H2O-CO2 anomalie quadrants. From these, we calculate the flux contributions of understory ejections and all flux quadrants. In addition we show that a distinctly depleted isotopic composition can be found in the ejected water vapour. Finally, we explored the role of clouds as a potential trigger for understory ejections.
06 Mar 2025
Satellites reveal a 28 % drop in Ukraine’s Nitrogen oxides emissions during the Russia-Ukraine war in 2022
Yu Mao, Weimin Ju, Hengmao Wang, Liangyun Liu, Haikun Wang, Shuzhuang Feng, Mengwei Jia, and Fei Jiang
EGUsphere, https://doi.org/10.5194/egusphere-2024-3672, https://doi.org/10.5194/egusphere-2024-3672, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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The Russia-Ukraine war in 2022 severely disrupted Ukraine’s economy, with significant reductions in industrial, transportation, and residential activities. Our research used satellite data to track changes in nitrogen oxide emissions, a key indicator of human activity, during the war. We found a 28 % decline in emissions, which was twice of the decrease caused by the COVID-19 pandemic. This study highlights how modern warfare can deeply impact both the environment and economic stability.
05 Mar 2025
Isotopic signatures of methane emission from oil and natural gas plants in southwestern China
Dingxi Chen, Yi Liu, Zetong Niu, Ao Wang, Pius Otwil, Yuanyuan Huang, Zhongcong Sun, Xiaobing Pang, Liyang Zhan, and Longfei Yu
EGUsphere, https://doi.org/10.5194/egusphere-2025-377, https://doi.org/10.5194/egusphere-2025-377, 2025
Preprint under review for ACP (discussion: open, 3 comments)
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We carried out studies at 11 oil and gas sites in Southwest China (an important natural gas production area), investigating the methane concentration distribution pattern and emission inventory of oil and gas industrial sites through a combination of ground monitoring and drone airborne monitoring techniques, and at the same time, utilizing stable isotope techniques to trace back the methane from the oil and gas sites.
05 Mar 2025
Quantifying ice crystal growth rates in natural clouds from glaciogenic cloud seeding experiments
Christopher Fuchs, Fabiola Ramelli, Anna J. Miller, Nadja Omanovic, Robert Spirig, Huiying Zhang, Patric Seifert, Kevin Ohneiser, Ulrike Lohmann, and Jan Henneberger
EGUsphere, https://doi.org/10.5194/egusphere-2025-688, https://doi.org/10.5194/egusphere-2025-688, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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We quantify diffusional ice crystal growth in natural clouds using cloud seeding experiments. We report growth rates for 14 experiments between -5.1°C and -8.3°C and observe strong variations depending on the cloud characteristics. Comparing our growth rates to laboratory data, we found similar temperature-dependent trends, but the laboratory rates are higher. This data fills the gap in quantitative in situ observation of ice crystal growth, helping to validate models and laboratory experiments.
05 Mar 2025
Ammonia emissions and depositions over the contiguous United States derived from IASI and CrIS using the directional derivative approach
Zitong Li, Kang Sun, Kaiyu Guan, Sheng Wang, Bin Peng, Lieven Clarisse, Martin Van Damme, Pierre-François Coheur, Karen Cady-Pereira, Mark W. Shephard, Mark Zondlo, and Daniel Moore
EGUsphere, https://doi.org/10.5194/egusphere-2025-725, https://doi.org/10.5194/egusphere-2025-725, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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We estimate ammonia fluxes over the contiguous U.S. from 2008 to 2022 using a directional derivative approach applied to satellite observations from IASI and CrIS. Satellite-based flux estimates reveal that ammonia emissions deposit in nearby vegetation, with pronounced seasonal and spatial variability driven by agricultural activities, underscoring the need for improved monitoring and management strategies.
05 Mar 2025
Contrail models lacking post-fallstreak behavior could underpredict lifetime optical depth
Caleb Akhtar Martínez, Sebastian D. Eastham, and Jerome P. Jarrett
EGUsphere, https://doi.org/10.5194/egusphere-2025-278, https://doi.org/10.5194/egusphere-2025-278, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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Contrails are clouds that form behind aircraft and can warm the atmosphere as much as carbon dioxide emissions from those planes. This work compares two contrail models of different complexities to understand their lifecycle and impact. The models differ in how contrails evolve over time, implying that we may be significantly underestimating their climate impact. This highlights the need for model diversity and more evaluation against observations of long-lived contrails.
05 Mar 2025
Global Sensitivity of Tropospheric Ozone to Precursor Emissions in Clean and Present-Day Atmospheres: Insights from AerChemMIP Simulations
Wei Wang and Chloe Yuchao Gao
EGUsphere, https://doi.org/10.5194/egusphere-2024-4091, https://doi.org/10.5194/egusphere-2024-4091, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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We note that the CESM and GFDL models would not simulate the tropospheric O3 forcing due to precursor gases from natural sources. Furthermore, the ozone simulated by them are also obviously less sensitive to natural precursors than to anthropogenic sources. This research suggests that existing theories about the sensitivity of O3 to natural precursors might not be accurate in clean atmosphere.
05 Mar 2025
Multi-Machine Learning Approaches to Modeling Small-Scale Source Attribution of Ozone Formation
Zheng Xiao, Yifeng Lu, and Guangli Xiu
EGUsphere, https://doi.org/10.5194/egusphere-2025-160, https://doi.org/10.5194/egusphere-2025-160, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study innovates air pollution tracking in industrial areas by merging AI with traditional methods. Analyzing three years of data from a Shanghai chemical park, we identified ozone pollution sources and seasonal variations, revealing that chemical solvents and fuel vapors are key contributors. Our method enables faster, accurate source identification, aiding better air quality decisions in rapidly developing regions.
05 Mar 2025
Carbonyl compounds from typical combustion sources: emission characteristics, influencing factors, and their contribution to ozone formation
Yanjie Lu, Xinxin Feng, Yanli Feng, Minjun Jiang, Yu Peng, Tian Chen, and Yingjun Chen
EGUsphere, https://doi.org/10.5194/egusphere-2025-131, https://doi.org/10.5194/egusphere-2025-131, 2025
Preprint under review for ACP (discussion: open, 6 comments)
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The EFs of CCs from biomass burning (BB) is an order of magnitude higher than that from on-road sources. Fuel type determines the emission characteristics and composition of CCs. The formation of CCs from solid and liquid fuel sources is respectively controlled by combustion temperature and emission standards. In addition, biomass burning and agricultural machinery sources significantly contribute to the oxidizing capacity of regional atmospheres.
04 Mar 2025
Quantitative Analysis of Nighttime Effects of Radiation Belt Energetic Electron Precipitation on the D-Region Ionosphere during Lower Solar Activity Period
Xuan Dong, Shufan Zhao, Li Liao, Wei Xu, Ruilin Lin, Xiaojing Sun, Shengyang Huang, Yatong Cui, Jinlei Li, Hengxin Lu, and Xuhui Shen
EGUsphere, https://doi.org/10.5194/egusphere-2025-878, https://doi.org/10.5194/egusphere-2025-878, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Energetic electron precipitation (EEP) from the magnetosphere into the Earth's atmosphere can significantly alter the electron density in the D-region ionosphere, impacting its reflective properties and the effectiveness of low-frequency radio wave transmission. A comprehensive understanding of the influence of EEP on the D-region ionosphere can enhance predictive models of ionospheric behavior and mitigate the impacts of space weather.
04 Mar 2025
How well are aerosol–cloud interactions represented in climate models? – Part 2: Isolating the aerosol impact on clouds following the 2014–15 Holuhraun eruption
George Jordan, Florent Malavelle, Jim Haywood, Ying Chen, Ben Johnson, Daniel Partridge, Amy Peace, Eliza Duncan, Duncan Watson-Parris, David Neubauer, Anton Laakso, Martine Michou, and Pierre Nabat
EGUsphere, https://doi.org/10.5194/egusphere-2025-835, https://doi.org/10.5194/egusphere-2025-835, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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The 2014–15 Holuhraun eruption created a vast aerosol plume that acted as a natural experiment to assess how well climate models capture changes in cloud properties due to increased aerosol. We find that the models accurately represent the observed shift to smaller, more numerous cloud droplets. However, the models diverge in their aerosol induced changes to large-scale cloud properties, particularly cloud liquid water content. Our study shows that Holuhraun had a cooling effect on the Earth.
04 Mar 2025
The Diurnal Susceptibility of Subtropical Clouds to Aerosols
Marcin J. Kurowski, Matthew D. Lebsock, and Kevin M. Smalley
EGUsphere, https://doi.org/10.5194/egusphere-2025-714, https://doi.org/10.5194/egusphere-2025-714, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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This study explores how clouds respond to pollution throughout the day using high-resolution simulations. Polluted clouds show stronger daily changes: thicker clouds at night and in the morning but faster thinning in the afternoon. Pollution reduces rainfall but enhances drying, deepening the cloud layer. While the pollution initially brightens clouds, the daily cycle of cloudiness slightly reduces this brightening effect.
04 Mar 2025
Impacts of wildfire smoke aerosols on near-surface ozone photochemistry
Jiaqi Shen, Ronald C. Cohen, Glenn M. Wolfe, and Xiaomeng Jin
EGUsphere, https://doi.org/10.5194/egusphere-2025-706, https://doi.org/10.5194/egusphere-2025-706, 2025
Preprint under review for ACP (discussion: open, 3 comments)
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This study shows large chemical and radiative effects of smoke aerosols from fires on near-surface ozone production. Aerosol loading and NOx levels are identified as the primary factors influencing these effects. Furthermore, we show that the surface PM2.5 to NO2 column ratio can be used as an indicator for identifying aerosol-dominated regimes, facilitating the assessments of aerosol impacts on ozone formation through satellite observations.
04 Mar 2025
Roles of pH, ionic strength, and sulfate in the aqueous nitrate-mediated photooxidation of green leaf volatiles
Yuting Lyu, Taekyu Joo, Ruihan Ma, Mark Kristan Espejo Cabello, Tianye Zhou, Shun Yeung, Cheuk Ki Wong, Yifang Gu, Yiming Qin, and Theodora Nah
EGUsphere, https://doi.org/10.5194/egusphere-2025-570, https://doi.org/10.5194/egusphere-2025-570, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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We investigated the aqueous nitrate-mediated photooxidation of four green leaf volatiles (GLVs). The aqueous reaction medium conditions, dilute cloud/fog vs. concentrated aqueous aerosol conditions, governed the effects that pH, ionic strength, and sulfate have on the GLV degradation rates and aqSOA mass yields. Most notably, reactions initiated by sulfate photolysis have significant effects in aqueous aerosols, but not in cloud/fog droplets.
04 Mar 2025
Molecular insight into aqueous-phase photolysis and photooxidation of water-soluble organic matter emitted from biomass burning and coal combustion
Tao Cao, Cuncun Xu, Hao Chen, Jianzhong Song, Jun Li, Haiyan Song, Bin Jiang, Yin Zhong, and Ping’an Peng
EGUsphere, https://doi.org/10.5194/egusphere-2025-561, https://doi.org/10.5194/egusphere-2025-561, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study investigated the evolution of biomass and coal combustion-derived WSOM during aqueous photochemical process. The results indicate that photochemical aging induces distinct changes in the optical and molecular properties of WSOM and more pronounced alterations were observed during ·OH photooxidation than direct photolysis. Notably, our results also demostrated that atmospheric photooxidation may represent a significant source of BC-like substances.
04 Mar 2025
Simulated photochemical response to observational constraints on aerosol vertical distribution over North China
Xi Chen, Ke Li, Ting Yang, Xipeng Jin, Lei Chen, Yang Yang, Shuman Zhao, Bo Hu, Bin Zhu, Zifa Wang, and Hong Liao
EGUsphere, https://doi.org/10.5194/egusphere-2025-430, https://doi.org/10.5194/egusphere-2025-430, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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Aerosol vertical distribution that plays a crucial role in aerosol-photolysis interaction (API) remains underrepresented in chemical models. We integrated lidar and radiosonde observations to constrain the simulated aerosol profiles over North China and quantified the photochemical responses. The increased photolysis rates in the lower layers led to increased ozone and accounted for a 36 %–56 % reduction in API effects, resulting in enhanced atmospheric oxidizing capacity and aerosol formation.
04 Mar 2025
Surface Ozone: Seasonal cycles, trends and events, a new perspective from the OPE station in France over the 2012–2023 period
Sebastien Conil, Gilles Bergametti, Laurent Langrene, Morgan Lopez, Olivier Masson, Cyril Pallares, and Michel Ramonet
EGUsphere, https://doi.org/10.5194/egusphere-2025-148, https://doi.org/10.5194/egusphere-2025-148, 2025
Preprint under review for ACP (discussion: open, 3 comments)
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From 2012 to 2023, hourly surface ozone, trace gases, meteorological parameters, and weekly beryllium-7 and sodium-22 activity were monitored at the OPE station in eastern France. While mean afternoon ozone concentrations showed no significant trend, baseline ozone increased by 0.7 µg·m⁻³ per year. Ozone anomalies were linked to pollutants (CO, NOx, CH4) from November to February, and to Stratosphere-to-Troposphere Transport proxies from April to September.
03 Mar 2025
Measurement report: Atmospheric mercury measurements at the Russian Arctic station Amderma and connection with eruptions of Icelandic volcanoes
Fidel Pankratov, Alexander Mahura, Oleg Katz, Tuukka Petäjä, Valentin Popov, and Vladimir Masloboev
EGUsphere, https://doi.org/10.5194/egusphere-2025-393, https://doi.org/10.5194/egusphere-2025-393, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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During polar springs low concentrations of atmospheric mercury (Hg) in the atmospheric surface layer are frequently observed. Presence of elevated Hg (in springs of 2010–2011) is not typical, and such increases are determined by the atmospheric transport at regional scales. Atmospheric trajectories showed that the source elevated Hg in the Arctic (at Amderma station) is linked with active phases of the volcanic eruptions in Iceland. It is an anomaly in terms of the global Hg pollution dynamics.
03 Mar 2025
Effectiveness of Emission Controls on Atmospheric Oxidation and Air Pollutant Concentrations: Uncertainties due to Chemical Mechanisms and Inventories
Mingjie Kang, Hongliang Zhang, and Qi Ying
EGUsphere, https://doi.org/10.5194/egusphere-2025-255, https://doi.org/10.5194/egusphere-2025-255, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study examines the impacts of reducing nitrogen oxides and volatile organic compounds on ozone (O3), secondary inorganic aerosols (SIA), and OH and NO3 radicals. The results show similar predictions for 8-h O3 but significant variability for SIA and radicals, with differences up to 30 % for SIA and 200 % for radicals across chemical mechanisms and inventories. The findings highlight that evaluating control strategies for SIA and atmospheric oxidation capacity requires an ensemble approach.
03 Mar 2025
The Impact of Multi-Scale Turbulence Structures within the Urban Canopy of a Basin City on Haze Pollution Processes
Meiyan Liu, Yan Ren, Hongsheng Zhang, Min Zhang, Jiening Liang, Pengfei Tian, Xianjie Cao, Jiayun Li, and Lei Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2025-177, https://doi.org/10.5194/egusphere-2025-177, 2025
Preprint under review for ACP (discussion: open, 3 comments)
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The occurrence of unexpected thermal plumes promotes the increase in PM2.5 concentrations during 10:00–13:00. During 14:00–18:00, small-scale turbulent eddies with timescales less than 15 min or even 2 min contributes to the rapid removal of PM2.5, ejections and sweeps enhance the exchange of pollutants interior and exterior the UCL. During 22:00–07:00, sub-mesoscale motions can enhance pollutant dispersion by driving intermittent turbulence bursts, or by forming organized coherent structures.
28 Feb 2025
Measurement report: Number size distribution of sub-40 nm particles in the Amazon rainforest
Jianqiang Zhu, Guo Li, Uwe Kuhn, Bruno Backes Meller, Christopher Pöhlker, Paulo Artaxo, Ulrich Pöschl, Yafang Cheng, and Hang Su
EGUsphere, https://doi.org/10.5194/egusphere-2024-3911, https://doi.org/10.5194/egusphere-2024-3911, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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The manuscript reports unique measurement data on sub-40 nm particles and ions, especially those smaller than 10 nm in the Amazon from December 2022 to January 2023. A large number of sub-3 nm particles and naturally charged ions were present in the Amazonia boundary layer, and they showed a clear diurnal variation. The research will contribute to a better understanding of atmospheric processes in the pristine environment.
28 Feb 2025
Factors Causing Stratocumulus to Deviate from Subtropical High Variability on Seasonal to Interannual Timescales
Hairu Ding, Bjorn Stevens, and Hauke Schmidt
EGUsphere, https://doi.org/10.5194/egusphere-2025-876, https://doi.org/10.5194/egusphere-2025-876, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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This study examines the physical link between subtropical highs and stratocumulus variability. Using reanalysis data, we test two proposed pathways—one at the surface and one in the free troposphere—but find that neither is a dominant mechanism for stratocumulus variability on seasonal and interannual timescales. These results challenge the assumed influence of subtropical highs on stratocumulus and highlight the need for further research into lower tropospheric stability dynamics.
28 Feb 2025
Gas-particle partitioning of m-xylene and naphthalene oxidation products: temperature and NOx influence
Marwa Shahin, Julien Kammer, Brice Temime-Roussel, and Barbara D'Anna
EGUsphere, https://doi.org/10.5194/egusphere-2025-833, https://doi.org/10.5194/egusphere-2025-833, 2025
Preprint under review for ACP (discussion: open, 3 comments)
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Air pollution and climate change are influenced by tiny airborne particles called aerosols. This study explores how pollutants from urban sources, as m-xylene and naphthalene, form new particles in the atmosphere under different conditions. Using advanced techniques, we show how temperature and nitrogen oxides affect the formation and behaviour of these particles. Our findings will improve our understanding on secondary organic particle and air quality models.
28 Feb 2025
Formation of Chlorinated Organic Compounds from Cl Atom-Initiated Reactions of Aromatics and Their Detection in Suburban Shanghai
Chuang Li, Lei Yao, Yuwei Wang, Mingliang Fang, Xiaojia Chen, Lihong Wang, Yueyang Li, Gan Yang, and Lin Wang
EGUsphere, https://doi.org/10.5194/egusphere-2025-607, https://doi.org/10.5194/egusphere-2025-607, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Our laboratory experiments revealed that abundant Cl-OOMs were formed from the reactions between Cl atoms and aromatics, and Cl-addition was identified as a non-negligible pathway for the formation of Cl-OOMs. Furthermore, many ambient Cl-OOMs potentially derived from Cl atoms and aromatics were measured in suburban Shanghai and most of them have adverse health effects. These findings provide critical insights into the formation mechanisms of Cl-OOMs in polluted settings.
28 Feb 2025
Contribution of gravity waves to shear in the extratropical lowermost stratosphere: insights from idealized baroclinic life cycle experiments
Madhuri Umbarkar and Daniel Kunkel
EGUsphere, https://doi.org/10.5194/egusphere-2025-351, https://doi.org/10.5194/egusphere-2025-351, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Atmospheric gravity waves (GWs) significantly enhance vertical shear in the lowermost stratosphere (LMS), influencing turbulence and mixing in the extratropical transition layer. Using idealized baroclinic life cycle experiments with ICON model, this study demonstrates that moisture and cloud processes amplify GW activity, driving strong shear and turbulence in the LMS. These findings highlight the critical role of GWs in shaping the dynamics in the LMS, in particular for clear air turbulence.
27 Feb 2025
Increased Dynamic Efficiency in Mesoscale Organized Trade Wind Cumulus Clouds
Isabel L. McCoy, Sunil Baidar, Paquita Zuidema, Jan Kazil, W. Alan Brewer, Wayne M. Angevine, and Graham Feingold
EGUsphere, https://doi.org/10.5194/egusphere-2025-520, https://doi.org/10.5194/egusphere-2025-520, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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We use ship observations to investigate the dynamics of small clouds over the tropical oceans. When these cumulus clouds cluster together, they become more efficient at moving moisture into the cloud layer due to strengthened vertical air motions. This encourages further clustering and sustains clouds against diurnal variations in their environment. Greater resilience to environmental changes has implications for cumulus feedback on the climate, a significant uncertainty in future projections.
27 Feb 2025
Surprisingly Robust Photochemistry in Subarctic Particles During Winter: Evidence from Photooxidants
Laura Marie Dahler Heinlein, Junwei He, Michael Oluwatoyin Sunday, Fangzhou Guo, James Campbell, Allison Moon, Sukriti Kapur, Ting Fang, Kasey Edwards, Meeta Cesler-Maloney, Alyssa J. Burns, Jack Dibb, William Simpson, Manabu Shiraiwa, Becky Alexander, Jingqiu Mao, James H. Flynn III, Jochen Stutz, and Cort Anastasio
EGUsphere, https://doi.org/10.5194/egusphere-2025-824, https://doi.org/10.5194/egusphere-2025-824, 2025
Preprint under review for ACP (discussion: open, 3 comments)
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High-latitude cities like Fairbanks, Alaska, experience severe wintertime pollution episodes. While conventional wisdom holds that oxidation is slow under these conditions, field measurements find oxidized products in particles. To explore this, we measured oxidants in aqueous extracts of winter particles from Fairbanks. We find high concentrations of oxidants during illumination, indicating that particle photochemistry can be significant even in high latitudes during winter.
27 Feb 2025
A Microphysics Guide to Cirrus – Part 3: Occurrence patterns of cloud particles
Martina Krämer, Nicole Spelten, Christian Rolf, and Reinhold Spang
EGUsphere, https://doi.org/10.5194/egusphere-2025-669, https://doi.org/10.5194/egusphere-2025-669, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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The size and number of cirrus ice crystals is one parameter influencing the still uncertain effect of cirrus clouds on climate. Here, the occurrence of ice particle sizes and concentrations with varying temperature and cloud microphysical thickness is analyzed as well as whether they formed in-situ or were transported upwards as frozen droplets from further below. The analyses are based on a large database of airborne measurements and extensive simulations.
27 Feb 2025
The influence of ammonia emissions on the size-resolved global atmospheric aerosol composition and acidity
Xurong Wang, Alexandra P. Tsimpidi, Zhenqi Luo, Benedikt Steil, Andrea Pozzer, Jos Lelieveld, and Vlassis A. Karydis
EGUsphere, https://doi.org/10.5194/egusphere-2025-527, https://doi.org/10.5194/egusphere-2025-527, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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Ammonia (NH3) is an abundant alkaline gas and key precursor in particulate matter formation. While SO2 and NOx emissions have decreased, global NH3 emissions are stable or rising. This study investigates NH3 emission impacts on size-resolved aerosol composition and acidity using the EMAC model, analyzing three emission schemes. Sulphate-nitrate-ammonium aerosols in fine mode sizes are most sensitive to NH3 changes. Regional responses vary. NH3 buffers aerosol acidity, mitigating pH shifts.
27 Feb 2025
Investigating KDP signatures inside and below the dendritic growth layer with W-band Doppler Radar and in situ snowfall camera
Anton Kötsche, Alexander Myagkov, Leonie von Terzi, Maximilian Maahn, Veronika Ettrichrätz, Teresa Vogl, Alexander Ryzhkov, Petar Bukovcic, Davide Ori, and Heike Kalesse-Los
EGUsphere, https://doi.org/10.5194/egusphere-2025-734, https://doi.org/10.5194/egusphere-2025-734, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Our study combines radar observations of snowf with snowfall camera observations on the ground to enhance our understanding of radar variables and snowfall properties. We found that values of an important radar variable (KDP) can be related to many different snow particle properties and number concentrations. We were able to constrain which particle sizes contribute to KDP by using computer models of snowflakes and showed which microphysical processes during snow formation can influence KDP.
26 Feb 2025
Convection-generated gravity waves in the tropical lower stratosphere from Aeolus wind profiling, GNSS-RO and ERA5 reanalysis
Mathieu Ratynski, Sergey Khaykin, Alain Hauchecorne, Joan Alexander, Alexis Mariaccia, Philippe Keckhut, and Antoine Mangin
EGUsphere, https://doi.org/10.5194/egusphere-2025-394, https://doi.org/10.5194/egusphere-2025-394, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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This study investigates how tropical convection generates gravity waves, which play a key role in transporting energy across the atmosphere. By combining Aeolus satellite data with ERA5 reanalysis data and radio-occultation measurements, we identified significant wave activity overlooked by ERA5, particularly over the Indian Ocean. Aeolus fills major gaps in wind data, offering a clearer picture of wave dynamics and challenging assumptions about their behavior, improving climate models.
26 Feb 2025
Observations of tropospheric HONO are incompatible with understanding of atmospheric chemistry
Matthew James Rowlinson, Lucy J. Carpenter, Mat J. Evans, James D. Lee, Simone Andersen, Tomas Sherwen, Anna B. Callaghan, Roberto Sommariva, William Bloss, Siqi Hou, Leigh R. Crilley, Klaus Pfeilsticker, Benjamin Weyland, Thomas B. Ryerson, Patrick R. Veres, Pedro Campuzano-Jost, Hongyu Guo, Benjamin A. Nault, Jose L. Jimenez, and Khanneh Wadinga Fomba
EGUsphere, https://doi.org/10.5194/egusphere-2025-830, https://doi.org/10.5194/egusphere-2025-830, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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HONO is key to tropospheric chemistry. Observations show high HONO concentrations in remote air, possibly explained by nitrate aerosol photolysis. We use observational data to parameterize nitrate photolysis, evaluating simulated HONO against observations from multiple sources. We show improved agreement with observed HONO, but large overestimates in NOx and O3, beyond observational constraints. This implies a large uncertainty in the NOx budget and our understanding of atmospheric chemistry.
26 Feb 2025
Seasonal isoprene emission estimates over tropical South America inferred from satellite observations of isoprene
Shihan Sun, Paul I. Palmer, Richard Siddans, Brian J. Kerridge, Lucy Ventress, Achim Edtbauer, Akima Ringsdorf, Eva Y. Pfannerstill, and Jonathan Williams
EGUsphere, https://doi.org/10.5194/egusphere-2025-778, https://doi.org/10.5194/egusphere-2025-778, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Isoprene released by plants can impact atmospheric chemistry and climate. The Amazon rainforest is a major source of isoprene. We derived isoprene emissions using satellite retrievals of isoprene columns and a chemical transport model. We evaluated our isoprene emission estimates using ground-based isoprene observations and satellite retrievals of formaldehyde. We found that using satellite retrievals of isoprene can help better understand isoprene emissions over the Amazon.
25 Feb 2025
Efficient use of a Lagrangian Particle Dispersion Model for atmospheric inversions using satellite observations of column mixing ratios
Rona Louise Thompson, Nalini Krishnankutty, Ignacio Pisso, Philipp Schneider, Kerstin Stebel, Motoki Sasakawa, Andreas Stohl, and Stephen Platt
EGUsphere, https://doi.org/10.5194/egusphere-2025-147, https://doi.org/10.5194/egusphere-2025-147, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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Satellite remote sensing of atmospheric mixing ratios of greenhouse gases (GHGs) can provide information on the emissions of these GHGs. This study presents a novel method to use atmospheric column mixing ratios with a Lagrangian model of atmospheric transport to estimate GHG emissions. This method can reduce model errors resulting from how an observation is represented by an atmospheric model potentially reducing the errors in the GHG emissions derived.
25 Feb 2025
Measurement Report: Molecular composition, sources, and evolution of atmospheric organic aerosols in a basin city in China
Junke Zhang, Xinyi Fu, Chunying Chen, Yunfei Su, Siyu Liu, Luyao Chen, Yubao Chen, Gehui Wang, and Andre S. H. Prevot
EGUsphere, https://doi.org/10.5194/egusphere-2025-92, https://doi.org/10.5194/egusphere-2025-92, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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The 125 organic aerosol (OA) compounds in PM2.5 in winter in Chengdu were measured at the molecular level. OA was dominated by fatty acids, phthalate esters, and anhydrosugars, and were deeply influenced by anthropogenic sources. As pollution worsens: secondary inorganic species and secondary organic carbon (OC) dominated the increase in PM2.5; fatty acids and anhydrosugars dominated the increase in OA; and the contribution of secondary formation and biomass burning to OC increased markedly.
25 Feb 2025
Physical processes influencing the Asian climate due to black carbon emission over East and South Asia
Feifei Luo, Bjørn Samset, Camilla Stjern, Manoj Joshi, Laura Wilcox, Robert Allen, Wei Hua, and Shuanglin Li
EGUsphere, https://doi.org/10.5194/egusphere-2024-3867, https://doi.org/10.5194/egusphere-2024-3867, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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Black carbon (BC) aerosol is emitted from the incomplete combustion of biomass and fossil fuels. We found that Asian BC lead to a strong local cooling and drying. Reductions in precipitation primarily depend on the thermodynamic effects due to solar radiation absorption by BC. The combined thermodynamic and Dynamic effects shape the spatial pattern of precipitation responses to Asian BC. These results help further understand the impact of emissions of anthropogenic aerosols on Asian climate.
24 Feb 2025
The atmospheric settling of commercially sold microplastics
Alina Sylvia Waltraud Reininger, Daria Tatsii, Taraprasad Bhowmick, Gholamhossein Bagheri, and Andreas Stohl
EGUsphere, https://doi.org/10.5194/egusphere-2025-605, https://doi.org/10.5194/egusphere-2025-605, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Microplastics are transported over large distances in the atmosphere, but the shape-dependence of their atmospheric transport lacks investigation. We conducted laboratory experiments and atmospheric transport simulations to study the settling of commercially sold microplastics. We found that films settle up to 74 % slower and travel up to ~ 4x further than volume-equivalent spheres. Our work emphasizes the role of the atmosphere as a transport medium for commercial microplastics such as glitter.
24 Feb 2025
Likely breaks in cloud cover retrievals complicate attribution of the trend in the Earth Energy Imbalance
Jippe J. A. Hoogeveen, Jan Fokke Meirink, and Frank M. Selten
EGUsphere, https://doi.org/10.5194/egusphere-2025-418, https://doi.org/10.5194/egusphere-2025-418, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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We investigated the effect of clouds on the reflection of sunlight to space and thermal radiation from earth to space. We found a few possible inhomogeneities in the measurements. A clear decrease in reflection of sunlight was found, which we partly attributed to changes in cloud cover. Thermal radiation could be attributed relatively reliably, however we were unable to find the expected decrease due to greenhouse gasses. We do not know a conclusive cause for this.
24 Feb 2025
Influence of oceanic ventilation and terrestrial transport on the atmospheric volatile chlorinated hydrocarbons over the Western Pacific
Shan-Shan Liu, Jie Ni, Jin-Ming Song, Xu-Xu Gao, Zhen He, and Gui-Peng Yang
EGUsphere, https://doi.org/10.5194/egusphere-2025-251, https://doi.org/10.5194/egusphere-2025-251, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Volatile chlorinated hydrocarbons (VCHCs) harm the ozone layer and climate, but the role of the Western Pacific in their atmospheric budget is unclear. This study showed ocean ventilation and terrestrial transport shape VCHCs levels. The Western Pacific emits some VCHCs while absorbing CCl4, helping reduce its levels in Eastern Asia. These findings highlight the ocean’s key role in regulating atmospheric VCHCs and provide essential data to refine global estimates of VCHCs atmospheric budgets.
24 Feb 2025
Trace gas atmospheric rivers: remote drivers of air pollutants
Mukesh Rai, Kazuyuki Miyazaki, Vivienne Payne, Bin Guan, and Duane Waliser
EGUsphere, https://doi.org/10.5194/egusphere-2025-399, https://doi.org/10.5194/egusphere-2025-399, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study introduces a novel method for quantifying extreme events of trace gas air pollutants by leveraging a tropospheric chemical reanalysis data set. The analysis revealed that while extreme events are infrequent, they contribute substantially (60 %) to the total transport of pollutants. This finding underscores the critical role of long-range transport events in determining global and regional air quality.
24 Feb 2025
Effects of different emission inventories on tropospheric ozone and methane lifetime
Catherine Acquah, Laura Stecher, Mariano Mertens, and Patrick Jöckel
EGUsphere, https://doi.org/10.5194/egusphere-2025-294, https://doi.org/10.5194/egusphere-2025-294, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Short-lived ozone precursor species influence the formation of ozone and also the atmospheric lifetime of methane. Our study assesses the effect of two widely used emission inventories of these species on ozone and the methane lifetime. Our results indicate tropospheric ozone and methane lifetime differences of around 4 % even though both emission inventories aim at representing present-day conditions. We further attribute the differences to emissions of individual sectors, e.g. land traffic.
24 Feb 2025
The 21st-century wetting inhibits growing surface ozone in Northwestern China
Xiaodong Zhang, Yu Yan, Ning Zhang, Wenpeng Wang, Huabing Suo, Xiaohu Jian, Chao Wang, Haibo Ma, Hong Gao, Zhaoli Yang, Tao Huang, and Jianmin Ma
EGUsphere, https://doi.org/10.5194/egusphere-2025-258, https://doi.org/10.5194/egusphere-2025-258, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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This study performed comprehensive sensitivity model simulations to explore the surface O3 responses to historical and projected climate change in Northwestern China (NW). Our results reveal that substantial wetting trends since the 21st century have mitigated O3 growth in this region, with the influence of wetting on O3 evolution outweighing the warming effect. These findings should be taken into account in future policymaking aimed at scientifically reducing O3 pollution in NW.
24 Feb 2025
Toxic Dust Emission from Drought-Exposed Lakebeds – A New Air Pollution Threat from Dried Lakes
Qianqian Gao, Guochao Chen, Xiaohui Lu, Jianmin Chen, Hongliang Zhang, and Xiaofei Wang
EGUsphere, https://doi.org/10.5194/egusphere-2025-596, https://doi.org/10.5194/egusphere-2025-596, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Numerous lakes are shrinking due to climate change and human activities, releasing pollutants from dried lakebeds as dust aerosols. The health risks remain unclear. Recently, Poyang and Dongting Lakes faced record droughts, exposing 99 % and 88 % of their areas. We show lakebed dust can raise PM10 to 637.5 μg/m³ and exceed non-carcinogenic (HQ=4.13) and Cr carcinogenic (~2.10×10⁻⁶) risk thresholds, posing growing health threats.
21 Feb 2025
Airborne quantification of Angolan offshore oil and gas methane emissions
Alina Fiehn, Maximilian Eckl, Magdalena Pühl, Tiziana Bräuer, Klaus-Dirk Gottschaldt, Heinfried Aufmhoff, Lisa Eirenschmalz, Gregor Neumann, Felicitas Sakellariou, Daniel Sauer, Robert Baumann, Guilherme De Aguiar Ventura, Winne Nayole Cadete, Dário Luciano Zua, Manuel Xavier, Paulo Correia, and Anke Roiger
EGUsphere, https://doi.org/10.5194/egusphere-2025-635, https://doi.org/10.5194/egusphere-2025-635, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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In September 2022, the METHANE-To-Go Africa (MTGA) campaign, part of UNEP’s IMEO Methane Science Studies, conducted the first CH₄ emissions measurements from West Africa’s offshore oil and gas sector. Using an aircraft-based mass balance method, emissions from Angolan offshore facilities were quantified. Older, low-producing facilities showed higher emissions than newer ones. High-emission events were observed, highlighting the need for targeted monitoring and mitigation efforts.
21 Feb 2025
Quantification of anthropogenic and marine sources to atmospheric mercury over the marginal seas of China and impact assessment on the sea-air exchange of mercury
Xiaofei Qin, Hao Li, Jia Chen, Junjie Wei, Hao Ding, Xiaohao Wang, Guochen Wang, Chengfeng Liu, Da Lu, Shengqian Zhou, Haowen Li, Yucheng Zhu, Ziwei Liu, Qingyan Fu, Juntao Huo, Yanfen Lin, Congrui Deng, Yisheng Zhang, and Kan Huang
EGUsphere, https://doi.org/10.5194/egusphere-2025-623, https://doi.org/10.5194/egusphere-2025-623, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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Mercury is a persistent toxic pollutant that has equally important anthropogenic and natural sources. This study developed a quantitative method on separating the anthropogenic and natural contributions of total gaseous mercury. The underlying impacts on the sea-air exchange fluxes of mercury are evaluated. The new method developed in this study can be reproducible in other regions and the findings are innovative in the field of mercury sources and biogeochemical cycles.
21 Feb 2025
Influence of anthropogenic pollution on the molecular composition of organic aerosols over a forest site in the Qinling Mountains region of central China
Xin Zhang, Lijuan Li, Jianjun Li, Yue Lin, Yan Cheng, Rui Wang, Shuyan Xing, Chongshu Zhu, Junji Cao, and Yuemei Han
EGUsphere, https://doi.org/10.5194/egusphere-2025-519, https://doi.org/10.5194/egusphere-2025-519, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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The influence of anthropogenic pollution on atmospheric organic composition was studied to explore the chemical processes of anthropogenic–biogenic interactions in the Qinling Mountains region of central China using advanced Orbitrap mass spectrometry. Organic molecular species exhibited distinct seasonal variabilities and were more abundant and chemically diverse in winter. Anthropogenic pollution played key roles in altering their composition and related properties under various conditions.
20 Feb 2025
How reliable are process-based 222radon emission maps? Results from an atmospheric 222radon inversion in Europe
Fabian Maier, Eva Falge, Maksym Gachkivskyi, Stephan Henne, Ute Karstens, Dafina Kikaj, Ingeborg Levin, Alistair Manning, Christian Rödenbeck, and Christoph Gerbig
EGUsphere, https://doi.org/10.5194/egusphere-2025-477, https://doi.org/10.5194/egusphere-2025-477, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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The radioactive noble gas radon (222Rn) is a suitable natural tracer for atmospheric transport and mixing processes that can be used to validate and calibrate atmospheric transport models. However, this requires accurate estimates of the 222Rn flux from the soil into the atmosphere. In our study, we evaluate the reliability of process-based 222Rn flux maps for Europe using a 222Rn inversion. Our inversion results can give some indications on how to improve the process-based 222Rn flux maps.
20 Feb 2025
Explainable ensemble machine learning revealing enhanced anthropogenic emissions of particulate nitro-aromatic compounds in eastern China
Min Li, Xinfeng Wang, Tianshuai Li, Yujia Wang, Yueru Jiang, Yujiao Zhu, Wei Nie, Rui Li, Jian Gao, Likun Xue, Qingzhu Zhang, and Wenxing Wang
EGUsphere, https://doi.org/10.5194/egusphere-2025-165, https://doi.org/10.5194/egusphere-2025-165, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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By integrating field measurements with interpretable ensemble machine learning framework, we comprehensively identified key driving factors of nitro-aromatic compounds (NACs), demonstrated complex interrelationships, and quantified their contributions across different locations. This work provides a reliable modelling approach for recognizing causes of NACs pollution, enhances our understanding on variations of atmospheric NACs, and highlights the necessity of strengthening emission controls.
19 Feb 2025
The influence of Amazonian anthropogenic emissions on new particle formation, aerosol, cloud and surface rain
Xuemei Wang, Kenneth S. Carslaw, Daniel P. Grosvenor, and Hamish Gordon
EGUsphere, https://doi.org/10.5194/egusphere-2025-132, https://doi.org/10.5194/egusphere-2025-132, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Anthropogenic emissions can influence aerosol particle number concentrations via new particle formation. Our model simulations predict around 10 % increase of the particle and cloud droplet number concentrations when doubling the emissions in the Manaus region in the Amazonian wet season. However, the corresponding changes in cloud water and rain mass are around 4 %. Such weak response implied that this convective environment is not sensitive to the localised anthropogenic emission changes here.
18 Feb 2025
A critical review of the use of iron isotopes in atmospheric aerosol research
Yifan Zhang, Rui Li, Zachary B. Bunnell, Yizhu Chen, Guanhong Zhu, Jinlong Ma, Guohua Zhang, Tim M. Conway, and Mingjin Tang
EGUsphere, https://doi.org/10.5194/egusphere-2025-474, https://doi.org/10.5194/egusphere-2025-474, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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The sources of aerosol Fe, especially soluble aerosol Fe, remain to be constrained. The stable isotope ratio of Fe (δ56Fe) has emerged as a potential tracer for discriminating and quantifying sources of aerosol Fe. In this review, we examine the state of the field for using δ56Fe as an aerosol source tracer, and constraints on endmember signatures.
18 Feb 2025
The historical climate trend resulted in changed convective transport patterns in model simulations
Adrienne Jeske and Holger Tost
EGUsphere, https://doi.org/10.5194/egusphere-2025-293, https://doi.org/10.5194/egusphere-2025-293, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Thunderstorms lead to a vertical redistribution of tracers throughout the troposphere. We applied a new tool, the convective exchange matrix, in historical simulations with a chemistry-climate model to investigate the trends in convective transport. This reveals that convection reaches higher but deep convection occurs less often in the time period from 2011 to 2020 than in the 1980ies. Thus, convective transport towards the upper troposphere has declined as an adaptation to climate change.
18 Feb 2025
Biomass burning smoke transport and radiative impact over the city of Sao Paulo: An extreme event case study
Jorge Rosas Santana, Gabriela Lima da Silva, Marcia Akemi Yamasoe, and Nilton Èvora do Rosario
EGUsphere, https://doi.org/10.5194/egusphere-2025-9, https://doi.org/10.5194/egusphere-2025-9, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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This study examines a rare event in São Paulo, Brazil, where wildfire smoke from South America mixed with clouds, causing midday darkness on 19 August 2019. Satellite data, surface measurements, and air mass modeling tracked the smoke from fires in Brazil, Bolivia, and Paraguay, transported to São Paulo within two days. The smoke-cloud interaction reduced surface irradiance to zero for 40 minutes and increased radiative efficiency by 7 %, highlighting impacts on air quality, energy, and climate.
18 Feb 2025
A Novel Identification Method for Stratospheric Gravity Waves in Nadir Viewing Satellite Observations
Peter G. Berthelemy, Corwin J. Wright, Neil P. Hindley, Phoebe E. Noble, and Lars Hoffmann
EGUsphere, https://doi.org/10.5194/egusphere-2025-455, https://doi.org/10.5194/egusphere-2025-455, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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Atmospheric gravity waves are one of the key mechanisms for moving energy upwards through the atmosphere. We use temperature data to see them from a satellite, and here have made a new method to automatically detect them. This works by seeing if points next to each other are from the same wave. This is useful for creating larger gravity wave datasets without noise, which can then be used by climate forecasters to improve their understanding of the atmosphere.
17 Feb 2025
Measurement report: Microphysical and optical characteristic of radiation fog – a study using in-situ, remote sensing, and balloon techniques
Katarzyna Nurowska, Przemysław Makuch, and Krzysztof M. Markowicz
EGUsphere, https://doi.org/10.5194/egusphere-2024-4074, https://doi.org/10.5194/egusphere-2024-4074, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study explores the properties of radiation fog in Southeastern Poland, focusing on how droplets and water content vary with height. Data from three September 2023 fog events show that larger droplets form near the ground, while fog dissipates from both top and bottom. Key findings include average droplet sizes, water content, and how fog impacts radiation. The results improve understanding of fog behavior and its environmental effects.
17 Feb 2025
Significant Response of Methane in the Upper Troposphere to Subseasonal Variability of the Asian Monsoon Anticyclone
Sihong Zhu, Mengchu Tao, Zhaonan Cai, Yi Liu, Liang Feng, Pubu Sangmu, Zhongshui Yu, and Junji Cao
EGUsphere, https://doi.org/10.5194/egusphere-2024-4188, https://doi.org/10.5194/egusphere-2024-4188, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Methane (CH4) emissions can be transported into the upper troposphere (UT) via the Asian monsoon anticyclone (AMA), driving CH4 enhancements. Whether emissions or upward transport remain debated. We analyzed UT CH4 variability with AMA dynamics, finding strong ties between CH4 distribution and the AMA’s east-west oscillation. When centered near 80° E, vertical transport largely enhances CH4 anomalies, with circulation effects 1–2 times greater than emissions.
17 Feb 2025
Global atmospheric inversion of the NH3 emissions over 2019–2022 using the LMDZ-INCA chemistry-transport model and the IASI NH3 observations
Pramod Kumar, Grégoire Broquet, Didier Hauglustaine, Maureen Beaudor, Lieven Clarisse, Martin Van Damme, Pierre Coheur, Anne Cozic, Bo Zheng, Beatriz Revilla Romero, Antony Delavois, and Philippe Ciais
EGUsphere, https://doi.org/10.5194/egusphere-2025-162, https://doi.org/10.5194/egusphere-2025-162, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Global maps of the NH3 emissions over 2019–2022 are derived using IASI NH3 spaceborne observations, the LMDZ-INCA chemistry-transport model at 1.27°×2.5° resolution and mass balance approach. The average global NH3 emissions over the period are ~98 Tg NH3 yr-1, which is significantly higher than three reference inventories. The analysis provides confidence in the seasonal variability and regional budgets, and provides new insights into NH3 emissions at global and regional scales.
14 Feb 2025
Development and implementation of SOMA: A Secondary Organic Module for Aerosol integration in high-resolution air quality simulations
Giannis Ioannidis, Nikoletta Bouloti, Paul Tremper, Chaofan Li, Christos Boikos, Nikolaos Rapkos, Till Riedel, Miikka Dal Maso, and Leonidas Ntziachristos
EGUsphere, https://doi.org/10.5194/egusphere-2025-193, https://doi.org/10.5194/egusphere-2025-193, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study introduces SOMA (Secondary Organic Module for Aerosol) to model SOA formation in urban environments, using VOC oxidation inputs from GECKO-A. Based on SOA formation experiments, SOMA incorporates correction factors for calibration purposes. A CFD model simulates toluene dispersion in Augsburg, and it’s linked to SOMA to show that background SOA contributes 21–53 % of total mass, fading after 7 hours, providing better understanding of SOA formation dynamics.
14 Feb 2025
Anthropogenic aerosol influence on a mixed-phase cloud precipitation in early Meiyu season over Yangtze River Delta: simulated microphysical and thermodynamic effects
Ruiyu Song, Bin Zhu, Lina Sha, Peng Qian, Fei Wang, Chunsong Lu, Yan Yin, and Yuying Wang
EGUsphere, https://doi.org/10.5194/egusphere-2025-43, https://doi.org/10.5194/egusphere-2025-43, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This study examines how anthropogenic aerosols affect rainfall during the early summer in China’s Yangtze River Delta. Using the WRF-Chem model, we found that moderate emissions increase rainfall by boosting cloud formation. However, high emissions reduce rainfall due to smaller cloud droplets, which hinder their growth. These findings highlight the complex impact of aerosol concentrations on precipitation and provide valuable data for future research on aerosol-cloud-precipitation interactions.
14 Feb 2025
Atmospheric Mercury: Recent advances in theoretical, computational, experimental, observational and isotopic understanding to decipher its complex redox transformations in the upper and lower atmosphere and interaction with Earth surface reservoirs
Jonas O. Sommar, Xueling Tang, Xinyu Shi, Guangyi Sun, Che-Jen Lin, and Xinbin Feng
EGUsphere, https://doi.org/10.5194/egusphere-2024-4190, https://doi.org/10.5194/egusphere-2024-4190, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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A more thorough understanding of the complex processes involved in the atmospheric Hg cycle has been achieved. The dynamics of the cycle are influenced by a rapid redox chemistry with several oxidation states and effects of multiphase interactions. This review provides a detailed analysis of the atmospheric chemistry of Hg in both the lower and upper atmosphere, together with a synthesis of the latest kinetic, thermochemical, photochemical, and isotopic fractionation data.
14 Feb 2025
Observationally Constrained Analysis on the Distribution of Fine and Coarse Mode Nitrate in Global Climate Models
Mingxuan Wu, Hailong Wang, Zheng Lu, Xiaohong Liu, Huisheng Bian, David Cohen, Yan Feng, Mian Chin, Didier A. Hauglustaine, Vlassis A. Karydis, Marianne T. Lund, Gunnar Myhre, Andrea Pozzer, Michael Schulz, Ragnhild B. Skeie, Alexandra P. Tsimpidi, Svetlana G. Tsyro, and Shaocheng Xie
EGUsphere, https://doi.org/10.5194/egusphere-2025-235, https://doi.org/10.5194/egusphere-2025-235, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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A key challenge in simulating the lifecycle of nitrate aerosol in global climate models is to accurately represent mass size distribution of nitrate aerosol, which lacks sufficient observational constraints. We found that most climate models underestimate the mass fraction of fine-mode nitrate at surface in all regions. Our study highlights the importance of gas-aerosol partitioning parameterization and simulation of dust and sea salt in correctly simulating mass size distribution of nitrate.
14 Feb 2025
Differential characterization of air ions in boreal forest of Finland and megacity of eastern China
Tinghan Zhang, Ximeng Qi, Janne Lampilahti, Liangduo Chen, Xuguang Chi, Wei Nie, Xin Huang, Zehao Zou, Wei Du, Tom Kokkonen, Tuukka Petäjä, Katrianne Lehtipalo, Veli-Matti Kerminen, Aijun Ding, and Markku Kulmala
EGUsphere, https://doi.org/10.5194/egusphere-2024-3370, https://doi.org/10.5194/egusphere-2024-3370, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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By comparing air ions at two “flagship” sites —the SMEAR II site in the boreal forest of Finland and the SORPES site in a megacity in eastern China—we characterized ion concentrations and their roles in new particle formation (NPF) across contrasting environments. The ion-induced fraction was much higher in clean areas. However, earlier activation of charged particles and high ion-induced fraction during quiet NPF at SORPES imply a non-negligible role for ion-induced NPF in polluted areas.
13 Feb 2025
Exploring Ozone-climate Interactions in Idealized CMIP6 DECK Experiments
Jingyu Wang, Gabriel Chiodo, Timofei Sukhodolov, Blanca Ayarzagüena, William T. Ball, Mohamadou Diallo, Birgit Hassler, James Keeble, Peer Nowack, Clara Orbe, and Sandro Vattioni
EGUsphere, https://doi.org/10.5194/egusphere-2025-340, https://doi.org/10.5194/egusphere-2025-340, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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We analyzed the ozone response under elevated CO2 using the data from CMIP6 DECK experiments. We then looked at the relations between ozone response and temperature and circulation changes to identify drivers of the ozone change. The climate feedback of ozone is investigated by doing offline calculations and comparing models with and without interactive chemistry. We find that ozone-climate interactions are important for Earth System Models, thus should be considered in future model development.
13 Feb 2025
Satellite Detection of NO2 Distributions and Comparison with Ground-Based Concentrations
Summer Joy Acker, Tracey Holloway, and Monica K. Harkey
EGUsphere, https://doi.org/10.5194/egusphere-2025-226, https://doi.org/10.5194/egusphere-2025-226, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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Nitrogen dioxide (NO2) is a harmful air pollutant linked to heart and lung diseases, regulated in the U.S. through annual and 1-hour standards. Most areas lack ground monitors, so satellites can help fill this gap. While past studies showed satellites capture annual NO2 patterns well, we assess their ability to reflect 1-hour pollution levels. We find satellites perform best farther from roads and in winter. TEMPO, a new satellite taking hourly measurements, improves the detection of higher NO2.
12 Feb 2025
Global Perspectives on Nitrate Aerosol Dynamics: A Comprehensive Sensitivity Analysis
Alexandros Milousis, Susanne M. C. Scholz, Hendrik Fuchs, Alexandra P. Tsimpidi, and Vlassis A. Karydis
EGUsphere, https://doi.org/10.5194/egusphere-2025-313, https://doi.org/10.5194/egusphere-2025-313, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Nitrate aerosol has become a dominant atmospheric component, surpassing sulfate in aerosol composition. However, its simulation remains challenging due to complex formation processes and regional variability. We use the EMAC model to assess key factors in nitrate aerosol predictions. Increasing grid resolution, reducing N2O5 hydrolysis uptake, and refined emissions improve PM2.5 predictions, but PM1 remains underestimated. Seasonal & diurnal discrepancies persist, requiring further refinements.
12 Feb 2025
Opinion: Improved scientific discourse and quality assurance by
interactive open access publishing with community-based
multi-stage open peer review in an open science landscape
Barbara Ervens, Ken S. Carslaw, Thomas Koop, and Ulrich Pöschl
EGUsphere, https://doi.org/10.5194/egusphere-2025-419, https://doi.org/10.5194/egusphere-2025-419, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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Over the past two decades, the European Geosciences Union (EGU) has demonstrated the success, viability and benefits of interactive open access (OA) publishing with public peer review in its journals, its publishing platform EGUsphere and virtual compilations. The article summarizes the evolution of the EGU/Copernicus publications and of OA publishing with interactive public peer review at large by placing the EGU/Copernicus publications in the context of current and future global open science.
12 Feb 2025
Relation between total-column and near-surface NO2 based on in-situ and PANDORA ground-based remote sensing observations
Ying Zhang, Yuanyuan Wei, Gerrit de Leeuw, Ouyang Liu, Yu Chen, Yang Lv, Yuanxun Zhang, and Zhengqiang Li
EGUsphere, https://doi.org/10.5194/egusphere-2025-360, https://doi.org/10.5194/egusphere-2025-360, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Nitrogen dioxide (NO2) is a major pollutant which at high concentrations may affect human health. We evaluated the remote sensing column NO2 in relation to near-surface concentrations throughout the day and found that the prohibition of vertical transport in the morning and the mixing in the afternoon resulted in different relations between the NS and TC NO2 concentrations. These different relationships have consequences for the use of satellite remote sensing to estimate NS NO2 concentrations.
12 Feb 2025
Dust pollution substantially weakens the impact of ammonia emission reduction on particulate nitrate formation
Hanrui Lang, Yunjiang Zhang, Sheng Zhong, Yongcai Rao, Minfeng Zhou, Jian Qiu, Jingyi Li, Diwen Liu, Florian Couvidat, Olivier Favez, Didier Hauglustaine, and Xinlei Ge
EGUsphere, https://doi.org/10.5194/egusphere-2025-231, https://doi.org/10.5194/egusphere-2025-231, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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This study investigates how dust pollution influences particulate nitrate formation. We found that dust pollution could reduce the effectiveness of ammonia emission controls by altering aerosol chemistry. Using field observations and modeling, we showed that dust particles affect nitrate distribution between gas and particle phases. Our findings highlight the need for pollution control strategies that consider both human emissions and dust sources for better urban air quality management.
12 Feb 2025
Evaluating reanalysis representations of climatological trace gas distributions in the Asian monsoon tropopause layer
Jonathon S. Wright, Shenglong Zhang, Jiao Chen, Sean M. Davis, Paul Konopka, Mengqian Lu, Xiaolu Yan, and Guang J. Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2025-135, https://doi.org/10.5194/egusphere-2025-135, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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Atmospheric reanalysis products reconstruct the past states of the atmosphere. These products are often used to study winds and temperatures in the upper-level monsoon circulation, but their ability to reproduce composition fields like water vapor and ozone has been questionable at best. Here we report clear signs of improvement in both consistency across reanalyses and agreement with satellite observations, outline limitations and suggest steps to further enhance the usefulness of these fields.
11 Feb 2025
Discussion of the spectral slope of the lidar ratio between 355 nm and 1064 nm from multiwavelength Raman lidar observations
Moritz Haarig, Ronny Engelmann, Holger Baars, Benedikt Gast, Dietrich Althausen, and Albert Ansmann
EGUsphere, https://doi.org/10.5194/egusphere-2025-449, https://doi.org/10.5194/egusphere-2025-449, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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The lidar ratio is an important quantity in aerosol typing. Its spectral slope contains further information about source region or transport paths of the observed aerosol. The extension until 1064 nm is a recent development led by our institute. We gathered previous observations and add new ones to provide the spectral slope for the most important aerosol types such as marine and continental aerosol, dust, smoke and sulfate and compared it the assumptions used for spaceborne backscatter lidars.
11 Feb 2025
Shift in cold-point tropopause trends derived from radiosonde, satellite, and reanalysis data
Mona Zolghadrshojaee, Susann Tegtmeier, Sean M. Davis, Robin Pilch Kedzierski, and Leopold Haimberger
EGUsphere, https://doi.org/10.5194/egusphere-2025-82, https://doi.org/10.5194/egusphere-2025-82, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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The tropical tropopause layer (TTL) is a crucial region where the troposphere transitions into the stratosphere, influencing air mass transport. This study examines temperature trends in the TTL and lower stratosphere using data from weather balloons, satellites, and reanalysis datasets. We found cooling trends in the TTL from 1980–2001, followed by warming from 2002–2023. These shifts are linked to changes in atmospheric circulation and impact water vapor transport into the stratosphere.
11 Feb 2025
Influence of Fire-Induced Heat and Moisture Release on Pyro-Convective Cloud Dynamics During the Australian New Year's Event: A Study Using Convection-Resolving Simulations and Satellite Data
Lisa Janina Muth, Sascha Bierbauer, Corinna Hoose, Bernhard Vogel, Heike Vogel, and Gholam Ali Hoshyaripour
EGUsphere, https://doi.org/10.5194/egusphere-2025-402, https://doi.org/10.5194/egusphere-2025-402, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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Our study explores how intense wildfires created thunderstorm-like clouds that can affect weather and climate globally. Using simulations with high resolution, we found that fire heat and moisture help form these clouds, lifting particles high into the atmosphere. This process is crucial for understanding how fires impact the environment. Despite some differences with observational data, our findings align well over time, showing the importance of fire-induced heat in cloud formation.
11 Feb 2025
Source-Dependent Optical Properties and Molecular Characteristics of Atmospheric Brown Carbon
Jinghao Zhai, Yin Zhang, Pengfei Liu, Yujie Zhang, Antai Zhang, Yaling Zeng, Baohua Cai, Jingyi Zhang, Chunbo Xing, Honglong Yang, Xiaofei Wang, Jianhuai Ye, Chen Wang, Tzung-May Fu, Lei Zhu, Huizhong Shen, Shu Tao, and Xin Yang
EGUsphere, https://doi.org/10.5194/egusphere-2025-463, https://doi.org/10.5194/egusphere-2025-463, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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Our findings show that BrC's optical properties vary by source. Secondary BrC from ozone pollution had the lowest absorption but highest wavelength dependence, while BrC from biomass combustion had the highest absorption with the lowest wavelength dependence. Molecular analysis indicated that CHON species from biomass burning had the strongest light absorption. These insights enhance the accuracy of climate models by highlighting source-specific optical properties of BrC.
11 Feb 2025
The impact of sea spray aerosol on photochemical ozone formation over eastern China: heterogeneous reaction of chlorine particles and radiative effect
Yingying Hong, Yuqi Zhu, Yuxuan Huang, Yiming Liu, Chuqi Xiong, and Qi Fan
EGUsphere, https://doi.org/10.5194/egusphere-2024-4132, https://doi.org/10.5194/egusphere-2024-4132, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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This study investigates the impact of sea spray aerosol on ozone formation across Eastern China, highlighting its complex influence through both chemical reactions and radiative effects, which vary seasonally and geographically.
10 Feb 2025
The dilemma in identifying WMO-defined tropopause height using high-resolution radiosondes
Yu Gou, Jian Zhang, Wuke Wang, Kaiming Huang, and Shaodong Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2024-4198, https://doi.org/10.5194/egusphere-2024-4198, 2025
Preprint under review for ACP (discussion: final response, 5 comments)
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The most commonly used tropopause height detection algorithm is based on the World Meteorological Organization (WMO) definition from 1957. However, with the increasing vertical resolution of atmospheric data, this definition has been found to fail in high-resolution radiosonde data. Thus, we propose an improved method to address this issue. This method can effectively bypassing thin inversions while preserving the fine–scale structure of the tropopause.
10 Feb 2025
Atmospheric chemistry in East Asia determines the iron solubility of aerosol particles supplied to the North Pacific Ocean
Kohei Sakata, Shotaro Takano, Atsushi Matsuki, Yasuo Takeichi, Hiroshi Tanimoto, Aya Sakaguchi, Minako Kurisu, and Yoshio Takahashi
EGUsphere, https://doi.org/10.5194/egusphere-2025-161, https://doi.org/10.5194/egusphere-2025-161, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Deposition of aerosol iron (Fe) into the ocean stimulates primary production and influences the global carbon cycle, although the factors governing the aerosol Fe solubility remain uncertain. Our observations in Japan revealed that both mineral dust and anthropogenic aerosols are significant sources of dissolved Fe, and that atmospheric chemical weathering enhances their solubility. This finding is expected to play a crucial role in estimating the supply of dissolved iron to the ocean.
10 Feb 2025
Climatology of aerosol pH and its controlling factors at the Melpitz continental background site in central Europe
Vikram Pratap, Christopher J. Hennigan, Bastian Stieger, Andreas Tilgner, Laurent Poulain, Dominik van Pinxteren, Gerald Spindler, and Hartmut Herrmann
EGUsphere, https://doi.org/10.5194/egusphere-2025-457, https://doi.org/10.5194/egusphere-2025-457, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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In this work, we characterize trends in aerosol pH and its controlling factors over the period of 2010 – 2019 at the Melpitz research station in eastern Germany. We find strong trends in aerosol pH and major inorganic species in response to changing emissions. We conduct a detailed thermodynamic analysis of the aerosol system and discuss implications for controlling PM2.5 in the region.
10 Feb 2025
Urban Ozone Trends in Europe and the USA (2000–2021)
Beth Nelson and Will Drysdale
EGUsphere, https://doi.org/10.5194/egusphere-2024-3743, https://doi.org/10.5194/egusphere-2024-3743, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Trends in urban O3 and NO2 across Europe and the USA were explored between 2000–2021. Many sites in Europe and revealed a slowing in the increase of high O3 levels though more trends were found to having an increasing O3 trend in 2015–2021. The reverse was true in the USA. The change points revealed several sites in Europe, were the second change point in NO2 switched to a negative trend, occurred in 2020 due to the COVID-19 pandemic, and in some cases this has continued until 2023.
10 Feb 2025
Particle flux-gradient relationships in the high Arctic: Emission and deposition patterns across three surface types
Theresa Mathes, Heather Guy, John Prytherch, Julia Kojoj, Ian Brooks, Sonja Murto, Paul Zieger, Birgit Wehner, Michael Tjernström, and Andreas Held
EGUsphere, https://doi.org/10.5194/egusphere-2025-183, https://doi.org/10.5194/egusphere-2025-183, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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The Arctic is warming faster than the global average and aerosol-cloud-sea-ice interactions are crucial for studying its climate system. During the ARTofMELT Expedition 2023, particle and sensible heat fluxes were measured over multiple surfaces. Wide lead surfaces acted as particle sources with the strongest sensible heat fluxes, while closed ice surfaces acted as a particle sink. This study improves methods to measure these interactions, enhancing our understanding of Arctic climate processes.
10 Feb 2025
Evolution of tropospheric aerosols over central China during 2010–2024 as observed by lidar
Dongzhe Jing, Yun He, Zhenping Yin, Kaiming Huang, Fuchao Liu, and Fan Yi
EGUsphere, https://doi.org/10.5194/egusphere-2025-56, https://doi.org/10.5194/egusphere-2025-56, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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We present the evolution of tropospheric aerosols over Wuhan, central China, from 2010 to 2024. The analysis highlights the long-term aerosol characteristics and separates natural (dust) and anthropogenic (non-dust) contributions. Emission control policies were highly effective during 2010–2017. However, after 2018, lidar-derived aerosol optical depth (AOD) ceased decreasing and fluctuated, and the decline in PM2.5 concentration also became slower, possibly due to atmospheric chemistry factors.
10 Feb 2025
On-road vehicle emission measurements show a significant reduction of black carbon and nitrogen oxides emissions in Euro6c and 6d diesel-powered cars
Irena Ježek Brecelj, Asta Gregorič, Lucijan Zgonik, Tjaša Rutar, Matic Ivančič, Balint Alfoldy, Griša Močnik, and Martin Rigler
EGUsphere, https://doi.org/10.5194/egusphere-2024-3553, https://doi.org/10.5194/egusphere-2024-3553, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Following a major car industry scandal involving diesel emissions tests, Europe introduced new testing procedures. However, concerns remained about their effectiveness. Our independent study examined real-world vehicle emissions and revealed encouraging findings: modern diesel cars perform as well as, or even better than, gasoline cars in terms of nitrogen oxides emissions. We found the same pattern for soot particles, challenging common perceptions about diesel's environmental impact.
10 Feb 2025
Comprehensive Non-targeted Molecular Characterization of Organic Aerosols in the Amazon Rainforest
Denis Leppla, Stefanie Hildmann, Nora Zannoni, Leslie Kremper, Bruna Hollanda, Jonathan Williams, Christopher Pöhlker, Stefan Wolff, Marta Sà, Maria Cristina Solci, Ulrich Pöschl, and Thorsten Hoffmann
EGUsphere, https://doi.org/10.5194/egusphere-2025-141, https://doi.org/10.5194/egusphere-2025-141, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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The chemical composition of organic particles in the Amazon rainforest was investigated to understand how biogenic and human emissions influence the atmosphere in this unique ecosystem. Seasonal patterns were found where wet seasons were dominated by biogenic compounds from natural sources while dry seasons showed increased fire-related pollutants. These findings reveal how emissions, fires and long-range transport affect atmospheric chemistry, with implications for climate models.
10 Feb 2025
Impact of urban canopy parameters on urbanization induced modifications of climate
Jan Karlický, Jáchym Bareš, and Peter Huszár
EGUsphere, https://doi.org/10.5194/egusphere-2025-388, https://doi.org/10.5194/egusphere-2025-388, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Our study includes results of WRF model simulations focused to evaluate sensitivity of local climate in cities on urban surface characteristics. Summer urban heat island is mostly impacted by changes in vegetation cover in city, albedo of roofs and irrigated green roofs. Results are usable also to reveal suitable mitigation strategies for reduction of negative aspects of local climate in cities.
10 Feb 2025
Identification and characterization of foehn events in Beijing and their impact on air-pollution episodes
Ju Li, Jingjiang Zhang, Mengxin Bai, Jie Su, Qingchun Li, and Xingcan Jia
EGUsphere, https://doi.org/10.5194/egusphere-2024-2684, https://doi.org/10.5194/egusphere-2024-2684, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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This research examines foehn events in Beijing using weather station data from 2015 to 2020. We found an average of 56.5 foehn days annually, primarily in winter. These winds can raise temperatures significantly and are associated with air-pollution levels. Strong foehn winds tend to reduce pollution, while weaker winds may increase it. Our study highlights the impact of foehn events on air quality, providing valuable insights for urban planning and environmental management.
07 Feb 2025
Observed relationship between drop size distribution and environmental properties in eastern Japan
Takashi Unuma
EGUsphere, https://doi.org/10.5194/egusphere-2025-210, https://doi.org/10.5194/egusphere-2025-210, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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The relationship between the cloud microphysical processes within convective clouds and their environmental conditions is not fully understood. The conversion process of cloud droplets to raindrops is dominant near the ground, whilst the collisional coalescence of cloud droplets and raindrops dominates above the layer within convective clouds. These processes depend strongly on static stability and are more likely to occur in humid environments.
07 Feb 2025
Improving the computation efficiency of a source-oriented chemical mechanism for the simultaneous source apportionment of ozone and secondary particulate pollutants
Qixiang Xu, Fangcheng Su, Ke Wang, Ruiqin Zhang, Qi Ying, and Michael J. Kleeman
EGUsphere, https://doi.org/10.5194/egusphere-2025-44, https://doi.org/10.5194/egusphere-2025-44, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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This manuscript introduces a novel approach for improving the computational efficiency and scalability of source-oriented chemical mechanisms by simplifying the representation of reactions involving source-tagged species and implementing a source-oriented Euler Backward Iterative (EBI) solver. These advancements reduce simulation times by up to 74 % while maintaining accuracy, offering significant practical benefits for long-term source apportionment studies.
07 Feb 2025
Direct radiative forcing of light-absorbing carbonaceous aerosol and the influencing factors over China
Shuangqin Yang, Yusi Liu, Li Chen, Nan Cao, Jing Wang, and Shuang Gao
EGUsphere, https://doi.org/10.5194/egusphere-2024-3705, https://doi.org/10.5194/egusphere-2024-3705, 2025
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Black carbon, primary brown carbon, and secondary brown carbon are the leading light-absorbing carbonaceous aerosols (LACs) that contribute significantly to climate change. We modified the GEOS-Chem model to simulate the climate change by LACs based on local emission inventory, and explored the impacts of LACs properties and atmospheric variables on the corresponding DRFs in seven regions of China. The study confirms the warming effect of LACs and deepens our knowledge of their climatic effects.
07 Feb 2025
Bioaerosols as indicators of central Arctic ice nucleating particle sources
Kevin R. Barry, Thomas C. J. Hill, Sonia M. Kreidenweis, Paul J. DeMott, Yutaka Tobo, and Jessie M. Creamean
EGUsphere, https://doi.org/10.5194/egusphere-2025-128, https://doi.org/10.5194/egusphere-2025-128, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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The Arctic is changing rapidly, and we sought to better understand how their clouds may change in the future through quantifying the natural cloud seeding particles over a year and uncover what they are made of. We wanted to determine their likely sources through concurrent DNA sequencing of airborne bacteria and fungi and found a persistent mixture of local and longer-range sources at all times.
06 Feb 2025
Fertilization-driven Pulses of Atmospheric Nitrogen Dioxide Complicate Air Pollution in Early Spring over North China
Tian Feng, Guohui Li, Shuyu Zhao, Naifang Bei, Xin Long, Yuepeng Pan, Yu Song, Ruonan Wang, Xuexi Tie, and Luisa Molina
EGUsphere, https://doi.org/10.5194/egusphere-2025-243, https://doi.org/10.5194/egusphere-2025-243, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Impacts of agricultural fertilization on nitrogen oxide and air quality are becoming more pronounced with continuous reductions in fossil fuel sources in China. We report that atmospheric nitrogen dioxide pulses driven by agricultural fertilizations largely complicate air pollution in North China, highlighting the necessity of agricultural emission control.
06 Feb 2025
Diagnosing O3 formation and O3-NOX-VOC sensitivity in a heavily polluted megacity of central China: A multi-method systematic evaluation over the warm seasons from 2019 to 2021
Shijie Yu, Hongyu Liu, Hui Wang, Fangcheng Su, Beibei Wang, Minghao Yuan, Kunao Song, Zixian Wang, Daoqing Xu, and Ruiqin Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2024-4178, https://doi.org/10.5194/egusphere-2024-4178, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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This study investigates O3 pollution in Zhengzhou. The results show that traffic and industrial emissions are the main sources of O3 and its precursors. The study highlights the significant impact of local emissions and the role of atmospheric free radicals in ozone formation. Reducing emissions of aromatics and alkenes can effectively reduce ozone pollution. These findings stress the importance of controlling traffic and industrial sources to mitigate O3 pollution.
06 Feb 2025
A Diagnostic Intercomparison of Modeled Ozone Dry Deposition Over North America and Europe Using AQMEII4 Regional-Scale Simulations
Christian Hogrefe, Stefano Galmarini, Paul A. Makar, Ioannis Kioutsioukis, Olivia E. Clifton, Ummugulsum Alyuz, Jesse O. Bash, Roberto Bellasio, Roberto Bianconi, Tim Butler, Philip Cheung, Alma Hodzic, Richard Kranenburg, Aurelia Lupascu, Kester Momoh, Juan Luis Perez-Camanyo, Jonathan E. Pleim, Young-Hee Ryu, Roberto San Jose, Martijn Schaap, Donna B. Schwede, and Ranjeet Sokhi
EGUsphere, https://doi.org/10.5194/egusphere-2025-225, https://doi.org/10.5194/egusphere-2025-225, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Performed under the umbrella of the fourth phase of the Air Quality Model Evaluation International Initiative (AQMEII4), this study applies AQMEII4 diagnostic tools to better characterize how dry deposition removes pollutants from the atmosphere in regional-scale models. The results also strongly suggest that improvement and harmonization of the representation of land use in these models would serve the community in their future development efforts.
06 Feb 2025
Accelerated impact of airborne glaciogenic seeding of stratiform clouds by turbulence
Meilian Chen, Xiaoqin Jing, Jiaojiao Li, Jing Yang, Xiaobo Dong, Bart Geerts, Yan Yin, Baojun Chen, Lulin Xue, Mengyu Huang, Ping Tian, and Shaofeng Hua
EGUsphere, https://doi.org/10.5194/egusphere-2025-47, https://doi.org/10.5194/egusphere-2025-47, 2025
Preprint under review for ACP (discussion: final response, 4 comments)
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Several recent studies have reported complete cloud glaciation induced by airborne-based glaciogenic cloud seeding over plains. Since turbulence is an important factor to maintain clouds in mixed-phase, it is hypothesized that turbulence may have an impact on the seeding effect. This hypothesis is evident in the present study, which shows turbulence can accelerate the impact of airborne glaciogenic seeding of stratiform clouds.
05 Feb 2025
Siberian wildfire smoke observations from space-based multi-angle imaging: A multi-year regional analysis of smoke particle properties, their evolution, and comparisons with North American boreal fire plumes
Katherine T. Junghenn Noyes and Ralph A. Kahn
EGUsphere, https://doi.org/10.5194/egusphere-2025-395, https://doi.org/10.5194/egusphere-2025-395, 2025
Revised manuscript under review for ACP (discussion: final response, 3 comments)
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With observations from NASA’s Multi-Angle Imaging Spectroradiometer (MISR) satellite instrument, we can constrain wildfire plume heights, smoke age, and particle size, shape, and light-absorption properties. We study over 3,600 wildfire plumes across Siberia by statistically comparing the MISR results to observations of fire strength, land cover type, and meteorology. We then stratify plumes by land cover type and infer the dominant aerosol aging mechanisms among different plume types.
05 Feb 2025
Ozonolysis of primary biomass burning organic aerosol particles: Insights into reactivity and phase state
Sophie Bogler, Jun Zhang, Rico K. Y. Cheung, Kun Li, Andre S. H. Prevot, Imad El Haddad, and David M. Bell
EGUsphere, https://doi.org/10.5194/egusphere-2025-385, https://doi.org/10.5194/egusphere-2025-385, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Authentic aerosols emitted from residential wood stoves and open burning processes are only slightly oxidized by ozone in the atmosphere. Under dry conditions the reaction does not proceed to completion, while under high humidity conditions the reactivity proceeds further. These results indicate the reactivity with ozone is likely impacted by aerosol phase state (e.g. aerosol viscosity).
05 Feb 2025
A machine learning-based perspective on deep convective clouds and their organisation in 3D. Part II: Spatial-temporal patterns of convective organisation
Sarah Brüning and Holger Tost
EGUsphere, https://doi.org/10.5194/egusphere-2025-376, https://doi.org/10.5194/egusphere-2025-376, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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The connection between convective cloud organisation and severe weather demands a robust characterisation of hazardous clouds. This study sets on to investigate spatio-temporal patterns and regional hotspots of convective organisation using machine learning-based 3D data and combining different organisation indices. While limitations arise due to overlapping effects of isolated and clustered convection, we emphasise the impact of a surface-specific seasonality that depends on the hemisphere.
05 Feb 2025
A machine learning-based perspective on deep convective clouds and their organisation in 3D. Part I: Influence of deep convective cores on the cloud life-cycle
Sarah Brüning and Holger Tost
EGUsphere, https://doi.org/10.5194/egusphere-2025-374, https://doi.org/10.5194/egusphere-2025-374, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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This study analyses the temporal variability and life-cycle of spatially organised convective clouds, frequently associated with severe weather. We derive the data from a machine learning-based 3D extrapolation of 2D satellite data. The results highlight the impact of convective organisation on horizontal and vertical cloud properties and a prolonged cloud life-cycle. Overall, our findings emphasise a more intense activity over land but enhanced seasonal changes over the ocean.
05 Feb 2025
Impact of volcanic sulfate aerosols on the stratospheric heating: implications on the Quasi-Biennial Oscillation
Prashant Chavan, Suvarna Fadnavis, Anton Laakso, Jean-Paul Vernier, Simone Tilmes, and Rolf Müller
EGUsphere, https://doi.org/10.5194/egusphere-2024-3825, https://doi.org/10.5194/egusphere-2024-3825, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Our simulations with volcanoes, when compared without volcanoes, show that volcanic aerosol precursors enter the tropical stratosphere, propagating upward and enhancing sulphate aerosol and heating. This stratospheric heating caused by the volcanoes reduces the amplitude of the QBO and disrupts its phases. Since QBO also modulates tropical convection and weather, we suggest including volcanic emissions and the QBO in the weather prediction model for a better forecast.
05 Feb 2025
Global CH4 Fluxes Derived from JAXA/GOSAT Lower Tropospheric Partial Column Data and the CTE-CH4 Atmospheric Inverse Model
Aki Tsuruta, Akihiko Kuze, Kei Shiomi, Fumie Kataoka, Nobuhiro Kikuchi, Tuula Aalto, Leif Backman, Ella Kivimäki, Maria K. Tenkanen, Kathryn McKain, Omaira E. García, Frank Hase, Rigel Kivi, Isamu Morino, Hirofumi Ohyama, David F. Pollard, Mahesh K. Sha, Kimberly Strong, Ralf Sussmann, Yao Te, Voltaire A. Velazco, Mihalis Vrekoussis, Thorsten Warneke, Minqiang Zhou, and Hiroshi Suto
EGUsphere, https://doi.org/10.5194/egusphere-2025-159, https://doi.org/10.5194/egusphere-2025-159, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Satellite data bring invaluable information about greenhouse gas emissions globally. We found that a new type of data from the Greenhouse Gas Observing Satellite (GOSAT), which contains information about methane in the lowest layer of Earth's atmosphere, could provide reliable estimates of recent methane emissions when combined with atmospheric modelling. Therefore, the use of such data is encouraged to improve emission quantification methods and advance our understanding of methane cycles.
05 Feb 2025
Characteristics of Boundary Layer Turbulence Energy Budget in Shenzhen Area Based on Coherent Wind Lidar Observations
Jinhong Xian, Zongxu Qiu, Huayan Rao, Zhigang Cheng, Xiaoling Lin, Chao Lu, Honglong Yang, and Ning Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2025-157, https://doi.org/10.5194/egusphere-2025-157, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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We studied how turbulence kinetic energy (TKE) changes in the lower atmosphere over Shenzhen, focusing on its role in weather and climate. Using advanced wind lidar technology, we tracked how TKE varies with height and across seasons. We found that heat near the ground drives turbulence, while wind effects become stronger higher up. Our results help improve weather and climate models by providing better data on how turbulence behaves in the atmosphere, aiding understanding of climate change.
05 Feb 2025
An observational estimate of Arctic UV-absorbing aerosol direct radiative forcing on instantaneous and climatic scales
Blake T. Sorenson, Jianglong Zhang, Jeffrey S. Reid, and Peng Xian
EGUsphere, https://doi.org/10.5194/egusphere-2025-80, https://doi.org/10.5194/egusphere-2025-80, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Plumes of wildfire smoke in the Arctic affect the Arctic radiative budget. Using a neural network and observations from satellite-based sensors, we analyzed the direct radiative forcing of smoke particles on the Arctic climate and estimated long-term forcing trends. Strong negative trends in aerosol direct radiative forcing were found in northern Russia and Canada, with positive trends found over parts of the Arctic Ocean. Overall, smoke plumes may act to counter future Arctic warming.
05 Feb 2025
Tropical cirrus evolution in a km-scale model with improved ice microphysics
Blaž Gasparini, Rachel Atlas, Aiko Voigt, Martina Krämer, and Peter N. Blossey
EGUsphere, https://doi.org/10.5194/egusphere-2025-203, https://doi.org/10.5194/egusphere-2025-203, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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Tropical cirrus clouds, especially their evolution, are poorly understood, contributing to uncertainty in climate projections. We address this by using novel tracers in a cloud-resolving model to track the life cycle of cirrus clouds, providing insights into cloud formation, ice crystal evolution, and radiative effects. We also improve the model's cloud microphysics with a simple, computationally efficient approach that can be applied to other models.
04 Feb 2025
Global Patterns and Trends in Ground-Level Ozone Chemical Formation Regimes from 1996 to 2022
Yu Tian, Siyi Wang, and Xiaomeng Jin
EGUsphere, https://doi.org/10.5194/egusphere-2025-368, https://doi.org/10.5194/egusphere-2025-368, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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We leverage over two-decade ground-based ozone observations alongside space-based observations of ozone precursors (NO2 and formaldehyde) to study the long-term evolution in ozone chemical regimes across global source regions. We find a global trend towards NOx-limited regimes, supported by increasing satellite-based HCHO/NO2 and a diminishing ozone weekend effect.
04 Feb 2025
Prior heterogeneous ice nucleation events increase likelihood of homogeneous freezing during the evolution of synoptic cirrus
Kasper Juurikkala, Christina J. Williamson, Karl D. Froyd, Jonathan Dean-Day, and Ari Laaksonen
EGUsphere, https://doi.org/10.5194/egusphere-2025-163, https://doi.org/10.5194/egusphere-2025-163, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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This study uses UCLALES-SALSA simulations to investigate synoptic cirrus clouds from NASA’s MACPEX campaign. Results show that prior heterogeneous ice nucleation depletes ice nuclei, creating conditions for subsequent homogeneous freezing. The findings highlight limitations of ice residual analysis in capturing cirrus evolution and provide insights into aerosol-cloud interactions critical to atmospheric and climate processes.
04 Feb 2025
Impacts of aerosol-radiation and aerosol-cloud interactions on a short-term heavy rainfall event – A case study in the Guanzhong Basin, China
Naifang Bei, Bo Xiao, Ruonan Wang, Yuning Yang, Lang Liu, Yongming Han, and Guohui Li
EGUsphere, https://doi.org/10.5194/egusphere-2024-3558, https://doi.org/10.5194/egusphere-2024-3558, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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This study uses a cloud-resolving model to examine how aerosols influence a mesoscale convective system (MCS) in central China via aerosol-radiation (ARIs) and aerosol-cloud interactions (ACIs). Without ARIs, added aerosols don’t significantly affect precipitation due to cloud competition for moisture. ARIs can stabilize or enhance convection. High aerosol levels lead to a combined ARI and ACI effect that greatly reduces precipitation.
03 Feb 2025
The effect of organic nucleation on the indirect radiative forcing with a semi-explicit chemical mechanism for highly oxygenated organic molecules (HOMs)
Xinyue Shao, Minghuai Wang, Xinyi Dong, Yaman Liu, Stephen R. Arnold, Leighton A. Regayre, Duseong S. Jo, Wenxiang Shen, Hao Wang, Man Yue, Jingyi Wang, Wenxin Zhang, and Ken S. Carslaw
EGUsphere, https://doi.org/10.5194/egusphere-2024-4135, https://doi.org/10.5194/egusphere-2024-4135, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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This study uses a global chemistry-climate model to investigate how new particle formation (NPF) from highly oxygenated organic molecules (HOMs) contributes to cloud condensation nuclei (CCN) in both preindustrial (PI) and present-day (PD) environments, and its impact on aerosol indirect radiative forcing. The findings highlight the crucial role of biogenic emissions in climate change, providing new insights for carbon-neutral scenarios and enhancing understanding of aerosol-cloud interactions.
03 Feb 2025
Current-use and organochlorine pesticides' multi-annual trends in air in Central Europe: primary and unidentified secondary sources
Ludovic Mayer, Lisa Melymuk, Adela Holubová Šmejkalová, Jiři Kalina, Petr Kukučka, Jakub Martiník, Petra Přibylová, Petr Šenk, Pourya Shahpoury, and Gerhard Lammel
EGUsphere, https://doi.org/10.5194/egusphere-2025-349, https://doi.org/10.5194/egusphere-2025-349, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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This study explored pesticides in the air at a rural site in the Czech Republic. Older pesticides, banned decades ago, are still found due to their release from soils, especially in summer. While levels of many have declined over time, some show new emissions from local or distant sources. Newer pesticides peaked during application seasons but declined after bans, though traces lingered. These findings highlight the lasting impacts of pesticide use and the importance of regulations.
03 Feb 2025
Evaluating urban methane emissions and their attributes in a megacity, Osaka, Japan, via mobile and eddy covariance measurements
Masahito Ueyama, Taku Umezawa, Yukio Terao, Mark Lunt, and James Lawrence France
EGUsphere, https://doi.org/10.5194/egusphere-2024-3926, https://doi.org/10.5194/egusphere-2024-3926, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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Methane (CH4) emissions were measured in Megacity Osaka, Japan, using mobile and eddy covariance methods. The CH4 emissions were much higher than those reported in local inventories, with natural gas contributing up to 74 % of the emissions. Several CH4 sources not accounted for in current inventories were identified. These results emphasize the need for more comprehensive emissions tracking in urban areas to enhance climate change mitigation efforts.
03 Feb 2025
Measurement Report: Polycyclic aromatic hydrocarbons (PAHs) and their alkylated (RPAHs), nitrated (NPAHs) and oxygenated (OPAHs) derivatives in the global marine atmosphere: occurrence, spatial variations, and source apportionment
Rui Li, Yubing Shen, Yumeng Shao, Yining Gao, Ziwei Yao, Qian Liu, Xing Liu, and Guitao Shi
EGUsphere, https://doi.org/10.5194/egusphere-2024-3740, https://doi.org/10.5194/egusphere-2024-3740, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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It is the first time to reveal the global variations of PAHs derivatives in the marine air. We found that marine aerosols in East China Sea (ECS) and Western Pacific (WP) were significantly affected by coal and engine combustion, while those in Bismarck Sea (BS) and East Australian Sea (EAS) were mainly influenced by wildfire and coal combustion. Antarctic Ocean (AO) was dominated by biomass burning and local shipping emissions. This finding help elucidate the mechanism of global PAH cycle.
03 Feb 2025
The importance of stratocumulus clouds for projected warming patterns and circulation changes
Philipp Breul, Paulo Ceppi, and Peer Nowack
EGUsphere, https://doi.org/10.5194/egusphere-2025-221, https://doi.org/10.5194/egusphere-2025-221, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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We explore how Pacific low-level clouds influence projections of regional climate change by adjusting a climate model to enhance low cloud response to surface temperatures. We find significant changes in projected warming patterns and circulation changes, under increased CO2 conditions. Our findings are supported by similar relationships across state-of-the-art climate models. These results highlight the importance of accurately representing clouds for predicting regional climate change impacts.
31 Jan 2025
Characteristics, main sources, health risks of PM2.5-bound perfluoroalkyl acids in Zhengzhou, central China: From seasonal variation perspective
Jingshen Zhang, Xibin Ma, Minzhen Li, Zichen Wang, Nan Jiang, and Fengchang Wu
EGUsphere, https://doi.org/10.5194/egusphere-2024-4147, https://doi.org/10.5194/egusphere-2024-4147, 2025
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Currently, few studies have begun to focus on the source and health risks of perfluoroalkyl acids (PFAAs), however no systematic studies have been conducted of PFAAs in PM2.5. This study aimed to characterize the pollution levels, identify the primary sources, and assess the health risks linked to PFAAs in PM2.5. The study indicated that seasonal regulation manufacturing related to perfluorooctanoic acid and joint pollution control with neighboring cities could reduce PFAAs levels in PM2.5.
31 Jan 2025
Influence of modes of climate variability on stratospheric gravity waves in the tropics using Radio Occultation and Reanalysis Data
Toyese Tunde Ayorinde, Cristiano Max Wrasse, Hisao Takahashi, Luiz Fernando Sapucci, Cosme Alexandre Oliveira Barros Figueiredo, Diego Barros, Ligia Alves da Silva, Patrick Essien, and Anderson Vestena Bilibio
EGUsphere, https://doi.org/10.5194/egusphere-2024-4083, https://doi.org/10.5194/egusphere-2024-4083, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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We studied how the Intertropical Convergence Zone (ITCZ) interacts with atmospheric gravity waves high in the sky and how global climate patterns like El Niño affect them. Using RO, ERA5, and NCEP reanalysis data, we found that the ITCZ shifts with seasons but stays strong year-round, influencing weather and energy flow. Our findings show how climate patterns shape weather systems and help predict changes, improving understanding of the atmosphere and its effects on global climate.
31 Jan 2025
Failed cyclogenesis of a mesoscale convective system near Cape Verde: The role of the Saharan trade wind layer among other inhibiting factors observed during the CADDIWA field campaign
Guillaume Feger, Jean-Pierre Chaboureau, Thibaut Dauhut, Julien Delanoë, and Pierre Coutris
EGUsphere, https://doi.org/10.5194/egusphere-2025-105, https://doi.org/10.5194/egusphere-2025-105, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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The Saharan air at trade wind layer, cold pools, and upper tropospheric dry air are identified as the three main factors inhibiting the cyclogenesis of the Pierre Henri mesoscale convective system. The findings were obtained trough observations made during two flights of the CADDIWA campaign and a convection-permitting simulation run with the Meso-NH model. They provide new insights into the complex dynamics of cyclogenesis in the Cape Verde region and challenge the existing model of the SAL.
31 Jan 2025
Bromine and Iodine in Atmospheric Mercury Oxidation
Svend L. Bager, Luna Zamok, Stephan P. A. Sauer, and Matthew S. Johnson
External preprint server, https://doi.org/10.48550/arXiv.2401.10053, https://doi.org/10.48550/arXiv.2401.10053, 2025
Preprint under review for ACP (discussion: final response, 4 comments)
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In this work we have studied by means of quantum chemical calculations at the CCSD(T) or CASPT2 level the kinetics of reactions of both bromine and iodine compounds with Hg, which are discussed to lead to the atmospheric oxidation of Hg. The particular interest is in the question whether the reactions with iodine compounds are as fast as the corresponding reactions with bromine compounds and therefore could also contribute to mercury depletion events.
30 Jan 2025
Aerosol impacts on regional climate: chaotic or physical effect?
Jiawang Feng, Chun Zhao, Jun Gu, Gudongze Li, Mingyue Xu, Shengfu Lin, and Jie Feng
EGUsphere, https://doi.org/10.5194/egusphere-2024-4037, https://doi.org/10.5194/egusphere-2024-4037, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Climate models help study aerosol impacts on regional climate. However, the atmosphere's chaotic nature makes it hard to separate true aerosol impacts from chaotic effects. Our ensemble experiments show that while large-scale aerosol effects are consistent, regional aerosol impacts vary significantly among experiments. We give a formula showing the relationship between chaotic effects and ensemble sizes, emphasizing the necessity of adequate ensemble members to capture reliable aerosol impacts.
30 Jan 2025
Carbon reduction requires attention to the contribution of natural gas use: Combustion and leakage
Haoyuan Chen, Tao Song, Xiaodong Chen, Yinghong Wang, Mengtian Cheng, Kai Wang, Fuxin Liu, Baoxian Liu, Guiqian Tang, and Yuesi Wang
EGUsphere, https://doi.org/10.5194/egusphere-2024-3931, https://doi.org/10.5194/egusphere-2024-3931, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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The methane leakage from natural gas may offset the reduced CO2 emissions from its combustion, To quantify its effect, we established the flux observation platform in the urban area of Beijing, the results showed that natural gas has become a common source of both after the transformation of energy structure, the natural gas could escape during storage and use. Although the natural gas leakage rate is not high (1.12 %), the greenhouse effect caused by natural gas leakage can not be ignored.
30 Jan 2025
Tropical Ozone Trends (1998 to 2023): A Synthesis from SHADOZ, IAGOS and OMI/MLS Observations
Anne M. Thompson, Ryan M. Stauffer, Debra E. Kollonige, Jerald R. Ziemke, Maria Cazorla, Pawel Wolff, and Bastien Sauvage
EGUsphere, https://doi.org/10.5194/egusphere-2024-3761, https://doi.org/10.5194/egusphere-2024-3761, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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This paper uses tropical ozone profiles from balloon borne instruments and aircraft to show that ozone in the free troposphere is not growing fast except over equatorial SE Asia.
29 Jan 2025
Aerosol type classification with machine learning techniques applied to multiwavelength lidar data from EARLINET
Ana del Águila, Pablo Ortiz-Amezcua, Siham Tabik, Juan Antonio Bravo-Aranda, Sol Fernández-Carvelo, and Lucas Alados-Arboledas
EGUsphere, https://doi.org/10.5194/egusphere-2025-269, https://doi.org/10.5194/egusphere-2025-269, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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This study applies machine learning (ML) techniques to classify aerosols using high-resolution multiwavelength lidar data from EARLINET network. We developed a reference dataset and evaluated six ML models, with LightGBM achieving over 90 % accuracy. Depolarization data proved critical for improving dust classification. Validated against a Saharan dust event, our approach improves aerosol classification and may help refine lidar-based processing strategies.
29 Jan 2025
Modeling on the drought stress impact on the summertime biogenic isoprene emissions in South Korea
Yong-Cheol Jeong, Yuxuan Wang, Wei Li, Hyeonmin Kim, Rokjin J. Park, and Mahmoudreza Momeni
EGUsphere, https://doi.org/10.5194/egusphere-2024-3616, https://doi.org/10.5194/egusphere-2024-3616, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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Isoprene, which is emitted from the vegetation, is important to regional air quality. Drought is one of the most important meteorological events that can modulate isoprene emissions by high temperature and low soil moisture. The drought stress impact on isoprene emissions is still uncertain, and we aimed to constrain it in South Korea using observation and model simulation. The results presented in this study may give useful information for future studies on drought stress on isoprene emissions.
28 Jan 2025
Airborne observations of cloud properties during their evolution from organized streets to isotropic cloud structures along an Arctic cold air outbreak
Marcus Klingebiel, André Ehrlich, Micha Gryschka, Nils Risse, Nina Maherndl, Imke Schirmacher, Sophie Rosenburg, Sabine Hörnig, Manuel Moser, Evelyn Jäkel, Michael Schäfer, Hartwig Deneke, Mario Mech, Christiane Voigt, and Manfred Wendisch
EGUsphere, https://doi.org/10.5194/egusphere-2025-201, https://doi.org/10.5194/egusphere-2025-201, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Our study is using aircraft measurements from the HALO-(𝒜𝒞)³ campaign to investigate the transition from organized Arctic cloud street structures to more scattered cloud shapes. We show that lower wind speeds cause this transition. In addition we look at the changes of the cloud coverage, the height of the clouds, the cloud particles and the radiative properties.
28 Jan 2025
Ice formation processes key in determining WCB outflow cirrus properties
Tim Lüttmer, Annette Miltenberger, and Peter Spichtinger
EGUsphere, https://doi.org/10.5194/egusphere-2025-185, https://doi.org/10.5194/egusphere-2025-185, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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We investigate ice formation pathways in a warm conveyor belt case study. We employ a multi-phase microphysics scheme that distinguishes between ice from different nucleation processes. Ice crystals in the cirrus outflow mostly stem from in-situ formation. Hence they were formed directly from the vapor phase. Sedimentational redistribution modulates cirrus properties and leads to a disagreement between cirrus origin classifications based on thermodynamic history and nucleation processes.
28 Jan 2025
Impact of cirrus on extratropical tropopause structure
Nicolas Emig, Annette K. Miltenberger, Peter M. Hoor, and Andreas Petzold
EGUsphere, https://doi.org/10.5194/egusphere-2024-3919, https://doi.org/10.5194/egusphere-2024-3919, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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This study presents in situ observations of cirrus occurrence from aircraft measurements in the extra-tropical transition layer (ExTL) using simultaneous measurements from two platforms. Lagrangian diagnostics based on high-resolution ICON simulations show long residence times of the cirrus in stratospheric air allowing to separate different diabatic processes during transit. The findings suggest that radiative diabatic cloud processes significantly impact the tropopause thermodynamic structure.
27 Jan 2025
Characterizing lead-rich particles in Beijing's atmosphere following coal-to-gas conversion: Insights from single particle aerosol mass spectrometry
Xiufeng Lian, Yongjiang Xu, Fengxian Liu, Long Peng, Xiaodong Hu, Guigang Tang, Xu Dao, Hui Guo, Liwei Wang, Bo Huang, Chunlei Cheng, Lei Li, Guohua Zhang, Xinhui Bi, Xiaofei Wang, Zhen Zhou, and Mei Li
EGUsphere, https://doi.org/10.5194/egusphere-2024-3469, https://doi.org/10.5194/egusphere-2024-3469, 2025
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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In this study, we analyzed the mixing state and atmospheric chemical processes of Pb-rich single particles in Beijing. Then, we focused on analyzing the differences in Pb-rich particles between the heating period and non-heating period, as well as the formation mechanism of lead nitrate after coal-to-gas conversion. Our results highlighted the improvement of coal-to-gas conversion on Pb in the particulate.
27 Jan 2025
Formation and composition of organic aerosols from the uptake of glyoxal on natural mineral dust aerosols: a laboratory study
Francesco Battaglia, Paola Formenti, Chiara Giorio, Mathieu Cazaunau, Edouard Pangui, Antonin Bergé, Aline Gratien, Thomas Bertin, Joël F. de Brito, Manolis N. Romanias, Vincent Michoud, Clarissa Baldo, Servanne Chevaillier, Gaël Noyalet, Philippe Decorse, Bénédicte Picquet-Varrault, and Jean-François Doussin
EGUsphere, https://doi.org/10.5194/egusphere-2024-4073, https://doi.org/10.5194/egusphere-2024-4073, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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This paper presents an experimental investigation of the interactions between glyoxal, an important volatile organic compound, and mineral dust particles of size and composition typical of natural conditions. We show that their interactions modifies in a definitive way the concentrations of the gas phase and the properties of the dust, which could have important implications of the atmospheric composition and the Earth's climate.
24 Jan 2025
Anvil-radiation diurnal interaction: Shortwave radiative-heating destabilization driving the diurnal variation of convective anvil outflow and its modulation on the radiative cancellation
Zhenquan Wang
EGUsphere, https://doi.org/10.5194/egusphere-2025-48, https://doi.org/10.5194/egusphere-2025-48, 2025
Revised manuscript under review for ACP (discussion: final response, 5 comments)
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The diurnal variation of convective anvil outflow results from the radiative heating. Daytime shortwave radiative heating destabilizes the anvil top and invigorates the top-heavy circulation, to enhance the convective anvil outflow. Nighttime longwave radiative cooling stabilizes the anvil top and hinders the circulation, to reduce the convective anvil outflow.
24 Jan 2025
Ozone (O3) observations in Saxony, Germany for 1997–2020: Trends, modelling and implications for O3 control
Yaru Wang, Dominik van Pinxteren, Andreas Tilgner, Erik Hans Hoffmann, Max Hell, Susanne Bastian, and Hartmut Herrmann
EGUsphere, https://doi.org/10.5194/egusphere-2024-4202, https://doi.org/10.5194/egusphere-2024-4202, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Tropospheric ground-level ozone (O3) is a global air-quality pollutant and greenhouse gas. Long-term O3 trends from 16 stations in Saxony, Germany, were compared over three periods, revealing worsened O3 pollution over the last decade. O3 formation has been volatile organic compound (VOC)-limited at traffic and urban sites for the past 20 years. To mitigate O3 pollution, moderate nitrogen oxides and additional VOC controls, particularly in solvent use, should be prioritized in the coming years.
23 Jan 2025
Exploring Sources of Ice Crystals in Cirrus Clouds: Comparative Analysis of Two Ice Nucleation Schemes in CAM6
Kai Lyu, Xiaohong Liu, and Bernd Kärcher
EGUsphere, https://doi.org/10.5194/egusphere-2024-4144, https://doi.org/10.5194/egusphere-2024-4144, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Two nucleation schemes are used to study ice nucleation, focusing on three ice sources: mountains, turbulence and anvils. Ice from mountains is concentrated in mid- and high-latitudes, while ice from turbulence and anvils is more common in low and mid-latitudes. Both schemes simulate orographic cirrus clouds, with mountain ice as the dominant source. The schemes differ in how they handle ice source competition, causing turbulence and anvils to influence clouds differently.
23 Jan 2025
Decadal tropospheric ozone radiative forcing estimations with offline radiative modelling and IAGOS aircraft observations
Pasquale Sellitto, Audrey Gaudel, and Bastien Sauvage
EGUsphere, https://doi.org/10.5194/egusphere-2024-3748, https://doi.org/10.5194/egusphere-2024-3748, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Tropospheric ozone is a potent greenhouse gas; its anthropogenic levels rise contributes to climate change. We evaluate tropospheric ozone trends and climate impacts with aircraft data and a radiative model, comparing the baseline period (1994–2004) to 2011–2016 and 2019. Tropospheric ozone levels increased significantly but with a smaller trend in 2019 than in 2011–2016. However, ozone radiative forcing did not decrease between these periods because of different vertical distribution evolutions
23 Jan 2025
Contrasting solubility and speciation of metal ions in total suspended particulate matter and fog from the coast of Namibia
Chiara Giorio, Anne Monod, Valerio Di Marco, Pierre Herckes, Denise Napolitano, Amy Sullivan, Gautier Landrot, Daniel Warnes, Marika Nasti, Sara D'Aronco, Agathe Gérardin, Nicolas Brun, Karine Desboeufs, Sylvain Triquet, Servanne Chevaillier, Claudia Di Biagio, Francesco Battaglia, Frédéric Burnet, Stuart J. Piketh, Andreas Namwoonde, Jean-François Doussin, and Paola Formenti
EGUsphere, https://doi.org/10.5194/egusphere-2024-4140, https://doi.org/10.5194/egusphere-2024-4140, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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A comparison between the solubility of trace metals in pairs of total suspended particulate (TSP) and fog water samples collected in Henties Bay, Namibia, during the AEROCLO-sA field campaign is presented. We found enhanced solubility of metals in fog samples which we attributed to metal-ligand complexes formation in the early stages of particle activation into droplets which can then remain in a kinetically stable form in fog or lead to the formation of colloidal nanoparticles.
23 Jan 2025
Evidence of Tropospheric Uplift into the Stratosphere via the Tropical Western Pacific Cold Trap
Xiaoyu Sun, Katrin Müller, Mathias Palm, Christoph Ritter, Denghui Ji, Tim Balthasar Röpke, and Justus Notholt
EGUsphere, https://doi.org/10.5194/egusphere-2024-3981, https://doi.org/10.5194/egusphere-2024-3981, 2025
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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We studied how air moves from the lower atmosphere to the stratosphere over the Tropical Western Pacific, a region with very cold temperatures high up. By using ground-based observations and tracking air movement, we found that during winter, the formation of thin cloud allow air to rise, while in summer, most of the air sinks down. This process changes the water vapor amount in the stratosphere, which influences the greenhouse effect and plays an important role in climate change.
22 Jan 2025
Significant secondary formation of nitrogenous organic aerosols in an urban atmosphere revealed by bihourly measurements of bulk organic nitrogen and comprehensive molecular markers
Xu Yu, Min Zhou, Shuhui Zhu, Liping Qiao, Jinjian Li, Yingge Ma, Zijing Zhang, Kezheng Liao, Hongli Wang, and Jian Zhen Yu
EGUsphere, https://doi.org/10.5194/egusphere-2024-4103, https://doi.org/10.5194/egusphere-2024-4103, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Online measurements of bulk aerosol organic nitrogen (ON), in conjunction with a comprehensive array of source markers, have revealed five emission sources and five potentially significant formation processes of nitrogenous organic aerosols. This study provides first quantitative source analysis of ON aerosol and valuable observational evidence on secondary ON aerosol formation through NH3 and NOx chemistries.
22 Jan 2025
Machine Learning Assisted Inference of the Particle Charge Fraction and the Ion-induced Nucleation Rates during New Particle Formation Events
Pan Wang, Yue Zhao, Jiandong Wang, Veli-Matti Kerminen, Jingkun Jiang, and Chenxi Li
EGUsphere, https://doi.org/10.5194/egusphere-2024-3666, https://doi.org/10.5194/egusphere-2024-3666, 2025
Revised manuscript under review for ACP (discussion: final response, 5 comments)
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We developed a numerical model to explore how the charge state of newly formed atmospheric particles evolves during growth and how this relates to ion-induced nucleation rates. We identify the governing factors of particle charging and further apply neural networks to predict particle charge states and estimate ion induced nucleation rates. This study offers insights into particle charging dynamics and introduces new methods for assessing ion induced nucleation in atmospheric research.
21 Jan 2025
Aerosol dynamic processes in the Hunga plume in January 2022: Does water vapor accelerate aerosol aging?
Julia Bruckert, Simran Chopra, Richard Siddans, Charlotte Wedler, and Gholam Ali Hoshyaripour
EGUsphere, https://doi.org/10.5194/egusphere-2024-4062, https://doi.org/10.5194/egusphere-2024-4062, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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The 2022 Hunga eruption emitted about 150 Tg water vapor into the stratosphere. Here, we show that the water vapor injection not only accelerates SO2 oxidation and sulfate production but also increases the aging of ash (coating of ash by sulfate). Our study shows that aerosol aging alone does not explain the rapid loss of ash after the Hunga eruption as observed by satellite instruments. However, some ash might be masked in the observation due to the strong coating.
21 Jan 2025
Technical note: Phase space depiction of CCN activation and cloud droplet diffusional growth
Wojciech W. Grabowski and Hanna Pawlowska
EGUsphere, https://doi.org/10.5194/egusphere-2024-4104, https://doi.org/10.5194/egusphere-2024-4104, 2025
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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A simple diagram to depict cloud droplets formation via activation of cloud condensation nuclei (CCN) as well as their subsequent growth and evaporation is presented.
21 Jan 2025
An improved Bayesian inversion to estimate daily NOx emissions of Paris from TROPOMI NO2 observations between 2018–2023
Alba Mols, Klaas Folkert Boersma, Hugo Denier van der Gon, and Maarten Krol
EGUsphere, https://doi.org/10.5194/egusphere-2025-49, https://doi.org/10.5194/egusphere-2025-49, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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We created a new method to estimate city air pollution (NOx emissions) using satellite data. Testing showed our approach works well to track how pollution spreads in urban areas. By combining observations with prior knowledge, we improved the accuracy of emission estimates. Applying this method in Paris, we found emissions were 9 % lower than expected and dropped significantly during COVID-19 lockdowns. Our method offers a reliable way to monitor pollution and support environmental policies.
21 Jan 2025
A dynamical separation of deep and shallow branches in the stratospheric circulation
Rasul Baikhadzhaev, Felix Ploeger, Peter Preusse, Manfred Ern, and Thomas Birner
EGUsphere, https://doi.org/10.5194/egusphere-2024-4088, https://doi.org/10.5194/egusphere-2024-4088, 2025
Preprint under review for ACP (discussion: final response, 4 comments)
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Across four reanalyses, shallow branch of the stratospheric overturning circulation was found to be driven by the largest waves with wavenumbers 1 to 3, and deep branch of the circulation was found to be driven by smaller-scale waves. Yet, the height of the level separating the branches is depended on the reanalysis considered. Thus using the appropriate separation levels in model inter-comparisons could reduce the spread between models regarding climatology and trends in the circulation.
21 Jan 2025
Atmospheric fate of organosulfates through gas-phase and aqueous-phase reaction with hydroxyl radicals: implications in inorganic sulfate formation
Narcisse Tsona Tchinda, Xiaofan Lv, Stanley Numboniu Tasheh, Julius Numboniu Ghogomu, and Lin Du
EGUsphere, https://doi.org/10.5194/egusphere-2025-29, https://doi.org/10.5194/egusphere-2025-29, 2025
Revised manuscript under review for ACP (discussion: final response, 6 comments)
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This study examines the chemical transformation of selected organosulfates by reactions with HO• radicals both in the gas-phase and in the aqueous-phase. Results show that the nature of the substituents on the carbon chain can effectively alter the decomposition of organosulfates and ozone is highlighted as a key oxidant in the intermediate steps of this decomposition. The primary products from these reactions include inorganic sulfate and carbonyl compounds.
21 Jan 2025
Incorporation of multi-phase halogen chemistry into Community Multiscale Air Quality (CMAQ) model
Kiyeon Kim, Chul Han Song, Kyung Man Han, Greg Yarwood, Ross Beardsley, and Saewung Kim
EGUsphere, https://doi.org/10.5194/egusphere-2025-23, https://doi.org/10.5194/egusphere-2025-23, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Despite the crucial role of halogen radicals in the atmosphere, the current CMAQ model does not account for multi-phase halogen processes. To address this issue, we incorporated 177 halogen reactions, together with anthropogenic and natural halogen emissions into the CMAQ model. Our findings reveal that incorporation of these halogen processes significantly improves model performances compared to ground observations. In addition, we emphasize the influence of halogen radicals on air quality.
21 Jan 2025
Uncertainties in OCO-2 satellite retrievals of XCO2 limit diagnosis of transport model simulation uncertainty
Chiranjit Das, Ravi Kumar Kunchala, Prabir K. Patra, Naveen Chandra, Kentaro Ishijima, and Toshinobu Machida
EGUsphere, https://doi.org/10.5194/egusphere-2024-3976, https://doi.org/10.5194/egusphere-2024-3976, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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Our study compares model CO2 with aircraft and OCO-2 data to identify transport model errors to better policy-related flux estimation. The model align better with aircraft data than satellite data, especially over oceans, but struggles near the surface due to inaccurate CO2 estimates. Over the Amazon and Asian megacities, differences arise from limited measurements and coarse model resolution, highlighting the need for improved monitoring and higher-resolution data to capture emissions better.
21 Jan 2025
Modelling Arctic Lower Tropospheric Ozone: processes controlling seasonal variations
Wanmin Gong, Stephen R. Beagley, Kenjiro Toyota, Henrik Skov, Jesper Heile Christensen, Alexandru Lupu, Diane Pendlebury, Junhua Zhang, Ulas Im, Yugo Kanaya, Alfonso Saiz-Lopez, Roberto Sommariva, Peter Effertz, John W. Halfacre, Nis Jepsen, Rigel Kivi, Theodore K. Koenig, Katrin Müller, Claus Nordstrøm, Irina Petropavlovskikh, Paul B. Shepson, William R. Simpson, Sverre Solberg, Ralf M. Staebler, David W. Tarasick, Roeland Van Malderen, and Mika Vestenius
EGUsphere, https://doi.org/10.5194/egusphere-2024-3750, https://doi.org/10.5194/egusphere-2024-3750, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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This study showed that the springtime O3 depletion plays a critical role in driving the surface O3 seasonal cycle in Central Arctic. The O3 depletion events, while occurring most notably within the lowest few hundred metres above the Arctic Ocean, can induce a 5–7 % of loss in the pan-Arctic tropospheric O3 burden during springtime. The study also found an enhancement in O3 and NOy (mostly PAN) concentrations in the Arctic due to northern boreal wildfires, particularly at altitudes.
21 Jan 2025
Surface and tropospheric ozone over East Asia and Southeast Asia from observations: distributions, trends, and variability
Ke Li, Rong Tan, Wenhao Qiao, Taegyung Lee, Yufen Wang, Danyuting Zhang, Minglong Tang, Wenqing Zhao, Yixuan Gu, Shaojia Fan, Jinqiang Zhang, Xiaopu Lyu, Likun Xue, Jianming Xu, Zhiqiang Ma, Mohd Talib Latif, Teerachai Amnuaylojaroen, Junsu Gil, Mee-Hye Lee, Juseon Bak, Joowan Kim, Hong Liao, Yugo Kanaya, Xiao Lu, Tatsuya Nagashima, and Ja-Ho Koo
EGUsphere, https://doi.org/10.5194/egusphere-2024-3756, https://doi.org/10.5194/egusphere-2024-3756, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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East Asia and Southeast Asia has been identified as a global hot spot with the fastest ozone increase. This paper presents the most comprehensive observational view of ozone distributions and evolution over East Asia and Southeast Asia across different spatiotemporal scales in the past two decades, which will have important implications for assessing ozone impacts on public health and crop yields, and for developing future ozone control strategies.
20 Jan 2025
South Asia ammonia emission inversion through assimilating IASI observations
Ji Xia, Yi Zhou, Li Fang, Yingfei Qi, Dehao Li, Hong Liao, and Jianbing Jin
EGUsphere, https://doi.org/10.5194/egusphere-2024-3938, https://doi.org/10.5194/egusphere-2024-3938, 2025
Preprint under review for ACP (discussion: final response, 4 comments)
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This study established an ammonia emission inventory in South Asia via assimilation-based inversion system. The posterior emissions, calculated by integrating the CEDS inventory and IASI satellite observations, showed significant improvement over the prior. Validation against various measurements all support our posterior emission. It offers valuable insights of ammonia emissions for policymakers and researchers aiming to develop air quality management and mitigation strategies there.
20 Jan 2025
Climate-driven biogenic emissions alleviate the impact of man-made emission reduction on O3 control in Pearl River Delta region, southern China
Nan Wang, Song Liu, Jiawei Xu, Yanyu Wang, Chun Li, Hua Lu, and Fumo Yang
EGUsphere, https://doi.org/10.5194/egusphere-2024-3771, https://doi.org/10.5194/egusphere-2024-3771, 2025
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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We found that climate warming and changes in vegetation have increased biogenic volatile organic compound emissions in the Pearl River Delta region. These increasing natural emissions, mainly due to climate warming, are weakening the benefits of reducing man-made emission control, leading to higher ozone levels. This work helps us understand how climate change influences air quality and provides important insights for improving pollution control strategies in the future.
20 Jan 2025
Influence of biogenic NO emissions from soil on Atmospheric chemistry over Africa: a regional modelling study
Eric Martial Yao, Fabien Solmon, Marcellin Adon, Claire Delon, Corinne Galy-Lacaux, Graziano Giuliani, Bastien Sauvage, and Véronique Yoboue
EGUsphere, https://doi.org/10.5194/egusphere-2024-3179, https://doi.org/10.5194/egusphere-2024-3179, 2025
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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As climate change and human activities intensify in Africa, understanding how air pollution, climate, and natural cycles interact is crucial. This study explores how nitrogen oxide emissions from African soils, especially in dry regions, contribute to atmospheric pollution. By using a climate-chemistry model, we show that considering these emissions improves predictions of nitrogen dioxide, nitric acid and ozone, although some discrepancies remain compared to observations.
17 Jan 2025
Synthesis of surface snowfall rates and radar-observed storm structures in 10+ years of Northeast US winter storms
Laura M. Tomkins, Sandra E. Yuter, Matthew A. Miller, Mariko Oue, and Charles N. Helms
EGUsphere, https://doi.org/10.5194/egusphere-2025-6, https://doi.org/10.5194/egusphere-2025-6, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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This study investigates how radar-detected snow bands relate to snowfall rates during winter storms in the northeastern U.S. Using over a decade of data, we found that snow bands are not consistently linked to heavy snowfall at the surface, as snow particles are often dispersed by wind before reaching the ground. These findings highlight limitations of using radar reflectivity for predicting snow rates and suggest focusing on radar echo duration to better understand snowfall patterns.
17 Jan 2025
Biosphere-atmosphere related processes influence trace-gas and aerosol satellite-model biases
Emma Sands, Ruth M. Doherty, Fiona M. O'Connor, Richard J. Pope, James Weber, and Daniel P. Grosvenor
EGUsphere, https://doi.org/10.5194/egusphere-2024-4014, https://doi.org/10.5194/egusphere-2024-4014, 2025
Revised manuscript under review for ACP (discussion: final response, 3 comments)
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We use satellite observations to quantify isoprene, formaldehyde and aerosol optical depth biases in UKESM1.1 and their sensitivity to process representation. The more detailed chemistry mechanism is particularly impactful by decreasing the isoprene and formaldehyde biases and reducing aerosol formation. Other processes have strong regional impacts. The new processes affect the present-day aerosol direct radiative effect (+0.17 W m-2), with implications for land use change forcing studies.
17 Jan 2025
High-resolution modelling of early contrail evolution from hydrogen-powered aircraft
Annemarie Lottermoser and Simon Unterstraßer
EGUsphere, https://doi.org/10.5194/egusphere-2024-3859, https://doi.org/10.5194/egusphere-2024-3859, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Contrail-cirrus significantly contributes to aviation's overall climate impact. As hydrogen combustion and fuel cell use are emerging technologies for aircraft propulsion, we simulated individual contrails from hydrogen propulsion during the first six minutes after exhaust emission, termed the vortex phase. The ice crystal loss during that stage is crucial as the number of ice crystals has a large impact on the further evolution of contrails into contrail-cirrus and their radiative forcing.
16 Jan 2025
On the presence of high nitrite (NO2-) in coarse particles at Mt. Qomolangma
Zhongyi Zhang, Chunxiang Ye, Yichao Wu, Tao Zhou, Pengfei Chen, Shichang Kang, Chong Zhang, Zhuang Jiang, and Lei Geng
EGUsphere, https://doi.org/10.5194/egusphere-2024-4165, https://doi.org/10.5194/egusphere-2024-4165, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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This study reveals unexpectedly high levels of particulate nitrite at the Base Camp of Mt. Qomolangma, which overwhelmingly exists in coarse mode, and demonstrates that lofted surface soil contributes to the high levels of nitrite. Once lofted into atmosphere, the soil-derived nitrite is likely to participate in atmospheric reactive nitrogen cycling through gas-particle partitioning or photolysis, leading to the production of HONO, OH and NO and thereby influencing oxidation chemistry.
16 Jan 2025
Investigating the impact of subgrid-scale aerosol-cloud interaction on mesoscale meteorology prediction
Wenjie Zhang, Hong Wang, Xiaoye Zhang, Yue Peng, Zhaodong Liu, Deying Wang, Da Zhang, Chen Han, Yang Zhao, Junting Zhong, Wenxing Jia, Huiqiong Ning, and Huizheng Che
EGUsphere, https://doi.org/10.5194/egusphere-2024-3677, https://doi.org/10.5194/egusphere-2024-3677, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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We implement a real-time subgrid-scale aerosol-cloud interaction (ACI) mechanism in a mesoscale atmospheric chemistry system and find that subgrid-scale ACI can improve meteorological factors predictions. This study demonstrates the importance of real-time subgrid-scale ACI to weather forecast and the necessity of multiscale ACI studies.
16 Jan 2025
Bridging the polarimetric structure and lightning activity of an isolated thunderstorm during the cloud life cycle
Chuanhong Zhao, Yijun Zhang, Huiyan Zhai, Zhe Li, Dong Zheng, Xueyan Peng, Wen Yao, Sai Du, and Yuanmou Du
EGUsphere, https://doi.org/10.5194/egusphere-2024-4069, https://doi.org/10.5194/egusphere-2024-4069, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Lightning activity is highly related to the signatures of polarimetric radar on the basis of cloud electrification physics. However, few studies have focused on bridging the polarimetric structure and lightning activity during the cloud life cycle. Here, we evaluated the sequence and interactions of polarimetric parameters for indicating lightning activity from the perspective of the cloud life cycle, and the cloud microphysics of the polarimetric structure was explored.
16 Jan 2025
Modeling urban pollutant transport at multi-resolutions: Impacts of turbulent mixing
Zining Yang, Qiuyan Du, Qike Yang, Chun Zhao, Gudongze Li, Zihan Xia, Mingyue Xu, Renmin Yuan, Yubin Li, Kaihui Xia, Jun Gu, and Jiawang Feng
EGUsphere, https://doi.org/10.5194/egusphere-2024-3890, https://doi.org/10.5194/egusphere-2024-3890, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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This study investigates the impact of turbulent mixing on black carbon (BC) concentrations in urban areas using WRF-Chem at 25, 5, and 1 km resolutions. Significant variations in BC and turbulent mixing occur mainly at night. Higher resolutions reduce BC overestimation due to enhanced PBL mixing coefficients and vertical wind fluxes. Small-scale eddies at higher resolutions increase BC lifetime and column concentrations. Land use and terrain variations across multi-resolutions affect PBL mixing.
15 Jan 2025
Signatures of aerosol-cloud interactions in GiOcean: A coupled global reanalysis with two-moment cloud microphysics
Ci Song, Daniel McCoy, Andrea Molod, and Donifan Barahona
EGUsphere, https://doi.org/10.5194/egusphere-2024-4108, https://doi.org/10.5194/egusphere-2024-4108, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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The uncertainty in how clouds respond to aerosols limits our ability to predict future warming. This study uses a global reanalysis data, GiOcean, which includes a detailed treatment of cloud microphysics to represent interactions between aerosols and clouds. We evaluate the response of warm clouds to aerosols in GiOcean by comparing variables important for cloud properties from GiOcean with available spaceborne remote sensing observations.
15 Jan 2025
Homogeneous ice nucleation in adsorbed water films: A theoretical approach
Ari Laaksonen, Golnaz Roudsari, Ana A. Piedehierro, and André Welti
EGUsphere, https://doi.org/10.5194/egusphere-2024-4095, https://doi.org/10.5194/egusphere-2024-4095, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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The mechanisms of ice nucleation at temperatures below 235 K have remained unclear for the past century. We suggest that ice nucleation is caused by the freezing of water adsorbed on aerosol surfaces. To test this hypothesis, we derived theoretical equations to predict the exact atmospheric conditions under which ice nucleation occurs. Our predictions agree well with experiments. The new theory thus provides a basis for an improved description of ice nucleation in the atmosphere.
15 Jan 2025
Different responses of cold-air outbreak clouds to aerosol and ice production depending on cloud temperature
Xinyi Huang, Paul R. Field, Benjamin J. Murray, Daniel P. Grosvenor, Floortje van den Heuvel, and Kenneth S. Carslaw
EGUsphere, https://doi.org/10.5194/egusphere-2024-4070, https://doi.org/10.5194/egusphere-2024-4070, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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Cold-air outbreak (CAO) clouds play a vital role in climate prediction. This study explores the responses of CAO clouds to aerosols and ice production under different environmental conditions. We found that CAO cloud responses vary with cloud temperature and are strongly controlled by the liquid-ice partitioning in these clouds, suggesting the importance of good representations of cloud microphysics properties to predict the behaviours of CAO clouds in a warming climate.
15 Jan 2025
Source reconstruction via deposition measurements of an undeclared radiological atmospheric release
Stijn Van Leuven, Pieter De Meutter, Johan Camps, Piet Termonia, and Andy Delcloo
EGUsphere, https://doi.org/10.5194/egusphere-2024-4057, https://doi.org/10.5194/egusphere-2024-4057, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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We use deposition measurements to trace the source of the radioactive isotope Ru-106 released into the atmosphere in 2017, which led to detections in Europe and other parts of the northern hemisphere. Most frequently, measurements of air concentration are used for such purposes. Our research shows that while air concentration data can provide more precise results, deposition measurements can still effectively pinpoint the release location, offering a less costly and more versatile alternative.
15 Jan 2025
Constraining the budget of NOx and VOCs at a remote Tropical island using multi-platform observations and WRF-Chem model simulations
Catalina Poraicu, Jean-François Müller, Trissevgeni Stavrakou, Crist Amelynck, Bert W. D. Verreyken, Niels Schoon, Corinne Vigouroux, Nicolas Kumps, Jérôme Brioude, Pierre Tulet, and Camille Mouchel-Vallon
EGUsphere, https://doi.org/10.5194/egusphere-2024-3555, https://doi.org/10.5194/egusphere-2024-3555, 2025
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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We investigated the sources and impacts of nitrogen oxides and organic compounds over a remote tropical island. High-resolution WRF-Chem simulations were evaluated using in situ, FTIR and satellite measurements. This work highlights gaps in current models, like missing sources of key organic compounds and inaccuracies in emission inventories, emphasizing the importance of improving chemical and dynamical processes in atmospheric modelling for budget estimates in tropical regions.
15 Jan 2025
Insights into the real part of natural sea spray aerosol refractive index in the Pacific Ocean
Chengyi Fan, Bishuo He, Shuqi Guo, Jie Qiu, and Chunsheng Zhao
EGUsphere, https://doi.org/10.5194/egusphere-2024-3527, https://doi.org/10.5194/egusphere-2024-3527, 2025
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Marine aerosols play a critical role in weather and climate and their real part of the refractive index (RRI) is a key factor in their radiative effects. We present a study of RRI measurements using optical tweezers technology and find the calculated results of RRI using traditional method disagree with the measurements. A parameterization of the RRI and relative humidity relationship is proposed and it will improve the radiation calculation in numerical models.
14 Jan 2025
Direct measurement of N2O5 heterogeneous uptake coefficients on atmospheric aerosols in southwestern China and evaluation of current parameterizations
Jiayin Li, Tianyu Zhai, Xiaorui Chen, Haichao Wang, Shuyang Xie, Shiyi Chen, Chunmeng Li, Huabin Dong, and Keding Lu
EGUsphere, https://doi.org/10.5194/egusphere-2024-3804, https://doi.org/10.5194/egusphere-2024-3804, 2025
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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We directly measured the dinitrogen pentoxide (N2O5) uptake coefficient which critical impact the NOx fate and particulate nitrate formation in a typical highland city, Kunming, in China. We found the performance of current γ(N2O5) parameterizations showed deviations with the varying aerosol liquid water content (ALWC). Such differences would lead to biased estimation on particulate nitrate production potential. Our findings suggest the directions for future studies.
14 Jan 2025
Assessment of regional and interannual variations in tropospheric ozone in chemical reanalyses
Dylan Jones, Lucas Prates, Zhen Qu, William Cheng, Kazuyuki Miyazaki, Takashi Sekiya, Antje Inness, Rajesh Kumar, Xiao Tang, Helen Worden, Gerbrand Koren, and Vincent Huijen
EGUsphere, https://doi.org/10.5194/egusphere-2024-3759, https://doi.org/10.5194/egusphere-2024-3759, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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We evaluate five chemical reanalysis products to assess their potential to provide useful information on tropospheric ozone variability. We find that the reanalyses produce consistent information on ozone variations in the free troposphere, but have large discrepancies at the surface. The results suggests that improvements in the reanalyses are needed to better exploit the assimilated observations to enhance the utility of the reanalysis products at the surface.
14 Jan 2025
How COVID-19 related policies reshaped organic aerosol source contributions in central London
Gang I. Chen, Anja H. Tremper, Max Priestman, Anna Font, and David C. Green
EGUsphere, https://doi.org/10.5194/egusphere-2024-4041, https://doi.org/10.5194/egusphere-2024-4041, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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This study quantified the impact of the COVID lockdown and the Eat Out To Help Out (EOTHO) on the sources/compositions of aerosols. The lockdown significantly reduced the primary emission sources. This study confirmed the important presence of cooking emissions from commercial kitchens in central London by detecting the enhancement caused by the EOTHO policy after the lockdown. Biomass burning organic aerosol co-emitted with cooking activities from either the fuels or food ingredients used.
13 Jan 2025
Ground-based Tropospheric Ozone Measurements: Regional tropospheric ozone column trends from the TOAR-II/ HEGIFTOM homogenized datasets
Roeland Van Malderen, Zhou Zang, Kai-Lan Chang, Robin Björklund, Owen R. Cooper, Jane Liu, Eliane Maillard Barras, Corinne Vigouroux, Irina Petropavlovskikh, Thierry Leblanc, Valérie Thouret, Pawel Wolff, Peter Effertz, Audrey Gaudel, David W. Tarasick, Herman G. J. Smit, Anne M. Thompson, Ryan M. Stauffer, Debra E. Kollonige, Deniz Poyraz, Gérard Ancellet, Marie-Renée De Backer, Matthias M. Frey, James W. Hannigan, José L. Hernandez, Bryan J. Johnson, Nicholas Jones, Rigel Kivi, Emmanuel Mahieu, Isamu Morino, Glen McConville, Katrin Müller, Isao Murata, Justus Notholt, Ankie Piters, Maxime Prignon, Richard Querel, Vincenzo Rizi, Dan Smale, Wolfgang Steinbrecht, Kimberly Strong, and Ralf Sussmann
EGUsphere, https://doi.org/10.5194/egusphere-2024-3745, https://doi.org/10.5194/egusphere-2024-3745, 2025
Preprint under review for ACP (discussion: open, 2 comments)
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Tropospheric ozone is an important greenhouse gas and an air pollutant, whose distribution and time variability is mainly governed by anthropogenic emissions and dynamics. In this paper, we assess regional trends of tropospheric ozone column amounts, based on two different approaches of merging or synthesizing ground-based observations and their trends within specific regions. Our findings clearly demonstrate regional trend differences, but also consistently higher pre- than post-COVID trends.
13 Jan 2025
Global Ground-based Tropospheric Ozone Measurements: Reference Data and Individual Site Trends (2000–2022) from the TOAR-II/HEGIFTOM Project
Roeland Van Malderen, Anne M. Thompson, Debra E. Kollonige, Ryan M. Stauffer, Herman G. J. Smit, Eliane Maillard Barras, Corinne Vigouroux, Irina Petropavlovskikh, Thierry Leblanc, Valérie Thouret, Pawel Wolff, Peter Effertz, David W. Tarasick, Deniz Poyraz, Gérard Ancellet, Marie-Renée De Backer, Stéphanie Evan, Victoria Flood, Matthias M. Frey, James W. Hannigan, José L. Hernandez, Marco Iarlori, Bryan J. Johnson, Nicholas Jones, Rigel Kivi, Emmanuel Mahieu, Glen McConville, Katrin Müller, Tomoo Nagahama, Justus Notholt, Ankie Piters, Natalia Prats, Richard Querel, Dan Smale, Wolfgang Steinbrecht, Kimberly Strong, and Ralf Sussmann
EGUsphere, https://doi.org/10.5194/egusphere-2024-3736, https://doi.org/10.5194/egusphere-2024-3736, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Tropospheric ozone is an important greenhouse gas and is an air pollutant. The time variability of tropospheric ozone is mainly driven by anthropogenic emissions. In this paper, we study the distribution and time variability of ozone from harmonized ground-based observations from five different measurement techniques. Our findings will provide clear standard references for atmospheric models and evolving tropospheric ozone satellite data for the 2000–2022 period.
13 Jan 2025
Carbonate content and stable isotopic composition of aerosol carbon in the Canadian High Arctic
Petr Vodička, Kimitaka Kawamura, Bhagawati Kunwar, Lin Huang, Dhananjay K. Deshmukh, Md. Mozammel Haque, Sangeeta Sharma, and Leonard Barrie
EGUsphere, https://doi.org/10.5194/egusphere-2024-3656, https://doi.org/10.5194/egusphere-2024-3656, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Carbonate carbon (CC) is not negligible in Arctic total suspended particles (TSP). If not considered, CC biases the contribution of elemental and organic carbon. CC content in TSP was strongly reflected in the δ13C values of total carbon (TC). Carbon contribution from CaCO3 supports strong dependence of CC and δ13C on Ca. Finally, two hypothetical CC sources were identified based on the analysis of air mass back trajectories – dust resuspension and marine microorganisms.
13 Jan 2025
Lagrangian single-column modeling of Arctic airmass transformation during HALO-(𝒜𝒞)3
Michail Karalis, Gunilla Svensson, Manfred Wendisch, and Michael Tjernström
EGUsphere, https://doi.org/10.5194/egusphere-2024-3709, https://doi.org/10.5194/egusphere-2024-3709, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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During the spring Arctic warm-air intrusion captured by HALO-(𝒜𝒞)3, the airmass demonstrated a column-like structure. We built a Lagrangian modeling framework using a single-column model (AOSCM) to simulate the airmass transformation. Comparing to observations, reanalysis and forecast data, we found that the AOSCM can successfully reproduce the main features of the transformation. The framework can be used for future model development to improve Arctic weather and climate prediction.
13 Jan 2025
Identifying Synoptic Controls on Boundary Layer Thermodynamic and Cloud Properties in a Regional Forecast Model
Jordan Eissner, David Mechem, Yi Jin, Virendra Ghate, and James Booth
EGUsphere, https://doi.org/10.5194/egusphere-2024-3438, https://doi.org/10.5194/egusphere-2024-3438, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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Low-level clouds have important radiative feedbacks and can occur in a range of meteorological conditions, yet our knowledge and prediction of them are insufficient. We evaluate model forecasts of low-level cloud properties across a cold front and the associated environments that they form in. The model represents the meteorological conditions well and produces broken clouds behind the cold front in areas of strong surface forcing, large stability, and large-scale subsiding motion.
13 Jan 2025
Atmospheric processing and aerosol aging responsible for observed increase in absorptivity of long-range transported smoke over the southeast Atlantic
Abdulamid A. Fakoya, Jens Redemann, Pablo E. Saide, Lan Gao, Logan T. Mitchell, Calvin Howes, Amie Dobracki, Ian Chang, Gonzalo A. Ferrada, Kristina Pistone, Samuel E. Leblanc, Michal Segal-Rozenhaimer, Arthur J. Sedlacek III, Thomas Eck, Brent Holben, Pawan Gupta, Elena Lind, Paquita Zuidema, Gregory Carmichael, and Connor J. Flynn
EGUsphere, https://doi.org/10.5194/egusphere-2024-3197, https://doi.org/10.5194/egusphere-2024-3197, 2025
Revised manuscript under review for ACP (discussion: final response, 5 comments)
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Tiny atmospheric particles from wildfire smoke impact climate by interacting with sunlight and clouds, the extent of which is uncertain due to gaps in understanding how smoke changes over time. We developed a new method using remote sensing instruments to track how these particles evolve during atmospheric transport. Our results show that the ability of these particles to absorb sunlight increased as they travel. This discovery could help improve predictions of future climate scenarios.
13 Jan 2025
The Solar Zenith Angle Impacts MODIS versus CALIPSO AOD Retrieval Biases, with Implications for Arctic Aerosol Seasonality
Sarah Smith, Yutian Wu, Rob Levy, and Mingfang Ting
EGUsphere, https://doi.org/10.5194/egusphere-2024-3596, https://doi.org/10.5194/egusphere-2024-3596, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Satellite data from a laser-based instrument show Arctic particulate matter is highest in winter and spring, and lowest in summer. However, sunlight-based instruments show the highest values in summer and very low values in autumn/spring. We find that a sunlight-based instrument retrieves lower than expected values when the sun is low on the horizon, but only when clouds are also present, likely due to cloud shadows. This causes it to underestimate particulates in winter, even beyond the Arctic.
10 Jan 2025
Partitioning of ionic surfactants in aerosol droplets containing glutaric acid, sodium chloride, or sea salts
Alison Bain, Kunal Ghosh, Konstantin Tumashevich, Nonne L. Prisle, and Bryan R. Bzdek
EGUsphere, https://doi.org/10.5194/egusphere-2024-3993, https://doi.org/10.5194/egusphere-2024-3993, 2025
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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In this work, we measure the surface tension of picolitre volume droplets containing strong ionic surfactants and cosolutes. These measurements are compared to surface tension predictions using two independent surfactant partitioning models. We find that when salting out occurs, one model outperforms the other. These results highlight the importance of validating surfactant partitioning models against experimental data before applying them to predict the surface tension of ambient aerosol.
09 Jan 2025
Measurement report: Per- and polyfluoroalkyl substances (PFAS) in particulate matter (PM10) from activated sludge aeration
Jishnu Pandamkulangara Kizhakkethil, Zongbo Shi, Anna Bogush, and Ivan Kourtchev
EGUsphere, https://doi.org/10.5194/egusphere-2024-3952, https://doi.org/10.5194/egusphere-2024-3952, 2025
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Pollution with per- and polyfluoroalkyl substances (PFAS) received attention due to their environmental persistence and bioaccumulation. PM10 collected above a scaled-down activated sludge tank treating domestic sewage for a population >10,000 people in the UK were analysed for a range of short-, medium- and long-chain PFAS. Eight PFAS were detected in the PM10. Our results suggest that wastewater treatment processes i.e. activated sludge aeration could aerosolise PFAS into airborne PM.
09 Jan 2025
Impact of Convectively Coupled Tropical Waves on the composition and vertical structure of the atmosphere above Cabo Verde in September 2021 during the CADDIWA campaign
Tanguy Jonville, Maurus Borne, Cyrille Flamant, Juan Cuesta, Olivier Bock, Pierre Bosser, Christophe Lavaysse, Andreas Fink, and Peter Knippertz
EGUsphere, https://doi.org/10.5194/egusphere-2024-3606, https://doi.org/10.5194/egusphere-2024-3606, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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Tropical waves structure the atmosphere. Four types of tropical waves (ER, Kelvin, MRG-TD1, and MRG-TD2) are studied using filters, satellite measurements, and in situ data from the Clouds-Atmosphere Dynamics-Dust Interaction in West Africa (CADDIWA) campaign held in September 2021 in Cabo Verde. ER waves impact temperature and humidity above 2500 m, MRG-TD1 around 3500 m, and MRG-TD2 around 2000 m. Interactions between these waves favor tropical cyclone formation.
09 Jan 2025
Characterization of Free Tropospheric Layers With Polar Radio Occultation Data
Terence L. Kubar, Manuel de la Torre Juarez, Jonas Katona, and F. Joseph Turk
EGUsphere, https://doi.org/10.5194/egusphere-2024-3898, https://doi.org/10.5194/egusphere-2024-3898, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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We analyze space-borne observations of simultaneous vertical profiles of precipitation, cloud layers, and temperatures, and find that about 80–90 % of cloud tops globally reach or are below the level of least stability. Since water vapor is limited at these low temperatures, this height may be a more important constraint on cloud top heights than the tropopause height below the level of maximum stability. Only the heaviest precipitating clouds vertically extend above this most unstable level.
09 Jan 2025
Changes in the impacts of ship emissions on PM2.5 and its components in China under the staged fuel oil policies
Guangyuan Yu, Yan Zhang, Qian Wang, Zimin Han, Shenglan Jiang, Fan Yang, Xin Yang, and Cheng Huang
EGUsphere, https://doi.org/10.5194/egusphere-2024-3892, https://doi.org/10.5194/egusphere-2024-3892, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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China has carried out staged low-sulfur fuel policies since 2017. This study simulated the changing spatiotemporal patterns of the impacts of ship emissions on PM2.5 from 2017 to 2021 based on the updated emission inventories and mapping of chemical species in the CMAQ. Fuel policies caused evident relative changes in inorganic and organic components of the shipping-related PM2.5 over China’s port cities. The driving factors of the interannual, seasonal, and diurnal patterns were discussed.
09 Jan 2025
Improved Formulation of Fragmentation of Snow during Collision with Graupel/Hail based on Observations at Jungfraujoch: Cold Non-Dendritic Regime of Temperature
Freddy P. Paul, Martanda Gautam, Deepak Waman, Sachin Patade, Ushnanshu Dutta, Christoffer Pichler, Marcin Jackowicz-Korczynski, and Vaughan Phillips
EGUsphere, https://doi.org/10.5194/egusphere-2024-3800, https://doi.org/10.5194/egusphere-2024-3800, 2025
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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This study shows observations of a key mechanism for initiation of ice particles in clouds with a chamber deployed on the top of a mountain during snowfall in winter. The mechanism involves the fragmentation of snow particles in collisions with denser rimed ice precipitation, namely "graupel" or "hail". The study shows how the fragmentation can be represented in atmospheric models. An improved formulation of the mechanism is proposed in light of our observations with the chamber.
08 Jan 2025
The transport history of African biomass burning aerosols arriving in the remote Southeast Atlantic marine boundary layer and their impacts on cloud properties
Huihui Wu, Fanny Peers, Jonathan W. Taylor, Chenjie Yu, Steven J. Abel, Paul A. Barrett, Jamie Trembath, Keith Bower, Jim M. Haywood, and Hugh Coe
EGUsphere, https://doi.org/10.5194/egusphere-2024-3975, https://doi.org/10.5194/egusphere-2024-3975, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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This study investigates the transport history of African Biomass-Burning aerosols (BBAs) over the southeast Atlantic (SEA), and the relationship between transported BBAs and clouds around Ascension Island using in-situ airborne measurements. The work provides critical simplified parameterizations of aerosol-cloud interaction for improving the evaluation of radiative forcing over the SEA. It also identifies key entrainment regions for understanding the vertical transport process of African BBAs.
08 Jan 2025
Satellite-based evidence of dust emission over Northern Canada
Ian Ashpole and Aldona Wiacek
EGUsphere, https://doi.org/10.5194/egusphere-2024-3828, https://doi.org/10.5194/egusphere-2024-3828, 2025
Preprint under review for ACP (discussion: open, 3 comments)
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Using 20 years of high-resolution satellite data, we present quantitative evidence that High-Latitude Dust (HLD) sources to the atmosphere are widespread across the "Canadian Arctic Dust Belt". Our results motivate atmospheric model development to include HLD sources, while our data provides an observational basis for evaluating such improved models. The Arctic is a fragile region experiencing 3–4 greater warming than global average and HLD is of significance to that warming.
08 Jan 2025
Tracing elevated abundance of CH2Cl2 in the subarctic upper troposphere to the Asian Summer Monsoon
Markus Jesswein, Valentin Lauther, Nicolas Emig, Peter Hoor, Timo Keber, Hans-Christoph Lachnitt, Linda Ort, Tanja Schuck, Johannes Strobel, Ronja Van Luijt, C. Michael Volk, Franziska Weyland, and Andreas Engel
EGUsphere, https://doi.org/10.5194/egusphere-2024-3946, https://doi.org/10.5194/egusphere-2024-3946, 2025
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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The study investigates transport within the Asian Summer Monsoon, focussing on how CH2Cl2 reaches the subarctic tropopause region. Using data from the PHILEAS campaign in 2023, events with increased mixing ratios were detected. Their origin, the transport paths to the tropopause region and the potential entry into the stratosphere were analysed. The East Asian Summer Monsoon was identified as the main transport pathway, with only a small contribution to the stratosphere in the following days.
08 Jan 2025
Origin, size distribution and hygroscopic properties of marine aerosols in the south-western Indian Ocean: report of 6 campaigns of shipborne observations
Meredith Dournaux, Pierre Tulet, Joris Pianezze, Jérome Brioude, Jean-Marc Metzger, and Melilotus Thyssen
EGUsphere, https://doi.org/10.5194/egusphere-2024-3747, https://doi.org/10.5194/egusphere-2024-3747, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Aerosol measurements collected during six oceanographic campaigns carried out in 2021 and 2023 in the southwest Indian Ocean are presented and analyzed in this paper. The results highlight a large variability in the aerosol concentration, size and water vapor affinity depending on in-situ conditions and air mass transport over the ocean. Marine aerosol chemical composition is highly variable over this region, and should be considered to better study their impacts on regional weather and climate.
07 Jan 2025
Modelling the impact of anthropogenic aerosols on CCN concentrations over a rural boreal forest environment
Petri Clusius, Metin Baykara, Carlton Xavier, Putian Zhou, Juniper Tyree, Benjamin Foreback, Mikko Äijälä, Frans Graeffe, Tuukka Petäjä, Markku Kulmala, Pauli Paasonen, Paul I. Palmer, and Michael Boy
EGUsphere, https://doi.org/10.5194/egusphere-2025-39, https://doi.org/10.5194/egusphere-2025-39, 2025
Preprint under review for ACP (discussion: open, 0 comments)
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Cloud condensation nuclei are necessary to form clouds, and their size distribution affects cloud properties and therefore Earth’s energy budget. This study modelled the origins of cloud condensation nuclei at SMEAR II, Hyytiälä, Finland, and found that primary emissions and new particle formation separately contribute to more than half of the condensation nuclei, but they suppress each other, leading to current concentrations. Largest condensation nuclei originated mostly from emissions.
07 Jan 2025
Photochemical aging of aviation emissions: transformation of chemical and physical properties of exhaust emissions from a laboratory-scale jet engine combustion chamber
Anni Hartikainen, Mika Ihalainen, Deeksha Shukla, Marius Rohkamp, Arya Mukherjee, Quanfu He, Sandra Piel, Aki Virkkula, Delun Li, Tuukka Kokkola, Seongho Jeong, Hanna Koponen, Uwe Etzien, Anusmita Das, Krista Luoma, Lukas Schwalb, Thomas Gröger, Alexandre Barth, Martin Sklorz, Thorsten Streibel, Hendryk Czech, Benedikt Gündling, Markus Kalberer, Bert Buchholz, Andreas Hupfer, Thomas Adam, Thorsten Hohaus, Johan Øvrevik, Ralf Zimmermann, and Olli Sippula
EGUsphere, https://doi.org/10.5194/egusphere-2024-3836, https://doi.org/10.5194/egusphere-2024-3836, 2025
Revised manuscript under review for ACP (discussion: final response, 3 comments)
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Photochemical reactions altered the properties of kerosene-operated jet engine burner exhaust emissions, which were studied in laboratory using an oxidation flow reactor. Particle mass increased 300-fold as particles and gases became more oxidized. Light absorption increased, but the total direct radiative forcing efficiency was estimated to shift from positive to negative. The results highlight the importance of considering secondary aerosol formation when assessing the impacts of aviation.
07 Jan 2025
Moisture sources and dynamics over southeastern Tibetan Plateau reflected in dual water vapor isotopes
Zhongyin Cai, Rong Li, Cheng Wang, Qiukai Mao, and Lide Tian
EGUsphere, https://doi.org/10.5194/egusphere-2024-3801, https://doi.org/10.5194/egusphere-2024-3801, 2025
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Local and upstream specific humidity is the main factor determining non-monsoon season d-excess variability over southeast Tibetan Plateau (TP) due to the intrusion of cold and dry air from upper levels. During the summer monsoon season, d-excess and δ18O mainly reflect the effect of raindrop evaporation on humidity which leads to lower vapor δ18O but higher d-excess values. These findings provide new insights into using water isotopes to track moisture sources and dynamics over the TP.
07 Jan 2025
Identifying Drivers of Surface Ozone Bias in Global Chemical Reanalysis with Explainable Machine Learning
Kazuyuki Miyazaki, Yuliya Marchetti, James Montgomery, Steven Lu, and Kevin Bowman
EGUsphere, https://doi.org/10.5194/egusphere-2024-3753, https://doi.org/10.5194/egusphere-2024-3753, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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This study employs explainable machine learning to analyze the causes of significant biases in surface ozone estimates from chemical reanalysis. By analyzing global observations and chemical reanalysis outputs, key bias drivers such as meteorological conditions and precursor emissions were identified. This provides actionable insights to improve chemical transport models, observation systems, and emissions inventories, ultimately enhancing ozone reanalysis for better air pollution management.
07 Jan 2025
Vertical and horizontal variability and representativeness of the water vapor isotope composition in the lower troposphere: insight from Ultralight Aircraft flights in southern France during summer 2021
Daniele Zannoni, Hans Christian Steen-Larsen, Harald Sodemann, Iris Thurnherr, Cyrille Flamant, Patrick Chazette, Julien Totems, Martin Werner, and Myriam Raybaut
EGUsphere, https://doi.org/10.5194/egusphere-2024-3394, https://doi.org/10.5194/egusphere-2024-3394, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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High resolution airborne observations reveal that mixing between the free troposphere and surface evapotranspiration flux primarly modulates the water vapor isotopic composition in the lower troposphere. Water vapor isotopes structure variations occur on the scale of 100s of m, underlying the utility of stable isotopes for studying microscale atmospheric dynamics. This study also provides the basis for better validation of water vapor isotopes remote sensing retrievals with surface observations.
06 Jan 2025
Inverse modelling of New Zealand's carbon dioxide balance estimates a larger than expected carbon sink
Beata Bukosa, Sara Mikaloff-Fletcher, Gordon Brailsford, Dan Smale, Elizabeth D. Keller, W. Troy Baisden, Miko U. F. Kirschbaum, Donna L. Giltrap, Lìyı̌n Liáng, Stuart Moore, Rowena Moss, Sylvia Nichol, Jocelyn Turnbull, Alex Geddes, Daemon Kennett, Dora Hidy, Zoltán Barcza, Louis A. Schipper, Aaron M. Wall, Shin-Ichiro Nakaoka, Hitoshi Mukai, and Andrea Brandon
EGUsphere, https://doi.org/10.5194/egusphere-2024-3866, https://doi.org/10.5194/egusphere-2024-3866, 2025
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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We used atmospheric measurements and inverse modeling to estimate New Zealand's carbon dioxide (CO₂) emissions and removals from 2011 to 2020. Our study reveals that New Zealand's land absorbs more CO₂ than previously estimated, particularly in areas dominated by indigenous forests. Our results highlight gaps in current national CO₂ estimates and methods, suggesting a need for further research to improve emissions reporting and refine approaches to track progress toward climate mitigation goals.
06 Jan 2025
Contributions of primary anthropogenic sources and rapid secondary transformations to organic aerosol pollution in Nanchang, Central China
Wei Guo, Zicong Li, Renguo Zhu, Zhongkui Zhou, Hongwei Xiao, and Huayun Xiao
EGUsphere, https://doi.org/10.5194/egusphere-2024-3793, https://doi.org/10.5194/egusphere-2024-3793, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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Through a comprehensive year-long analysis of major polar organic compounds in PM2.5, we elucidate the complex composition and sources of organic aerosols (OAs) within the urban environment of Nanchang, China. Given the significant health and environmental impacts of PM2.5, our research provides critical insights into the contributions of primary emissions and secondary formation processes to urban OA, and confirm the sources and the influencing factors of OA during pollution episodes.
03 Jan 2025
The subtleties of three-dimensional radiative effects in contrails and cirrus clouds
Julie Carles, Nicolas Bellouin, Najda Villefranque, and Jean-Louis Dufresne
EGUsphere, https://doi.org/10.5194/egusphere-2024-3642, https://doi.org/10.5194/egusphere-2024-3642, 2025
Preprint under review for ACP (discussion: final response, 2 comments)
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Cirrus and contrails affect Earth’s energy balance with a lot of remaining uncertainty. The balance between solar and terrestrial radiation is delicate to calculate, and factors as cloud optical depth, shape, Sun position are crucial to estimate the effect of those clouds on radiation. Also, often neglected three dimensional paths of radiation, or 3D effects, may be important to account for at climatic scale.
03 Jan 2025
Intercomparison of global ground-level ozone datasets for health-relevant metrics
Hantao Wang, Kazuyuki Miyazaki, Haitong Zhe Sun, Zhen Qu, Xiang Liu, Antje Inness, Martin Schultz, Sabine Schröder, Marc Serre, and J. Jason West
EGUsphere, https://doi.org/10.5194/egusphere-2024-3723, https://doi.org/10.5194/egusphere-2024-3723, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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We compare six datasets of global ground-level ozone, developed using geostatistical, machine learning, or reanalysis methods. The datasets show important differences from one another in ozone magnitude, greater than 5 ppb, and trends, globally and regionally. Compared with measurements, performance varies among datasets, and most overestimate ozone, particularly at lower concentrations. These differences among datasets highlight uncertainties for applications to health and other impacts.
03 Jan 2025
Significant contributions of biomass burning to PM2.5-bound aromatic compounds: insights from field observations and quantum chemical calculations
Yanqin Ren, Zhenhai Wu, Fang Bi, Hong Li, Haijie Zhang, Junling Li, Rui Gao, Fangyun Long, Zhengyang Liu, Yuanyuan Ji, and Gehui Wang
EGUsphere, https://doi.org/10.5194/egusphere-2024-3678, https://doi.org/10.5194/egusphere-2024-3678, 2025
Preprint under review for ACP (discussion: final response, 3 comments)
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The daily concentrations of Polycyclic aromatic hydrocarbons (PAHs), oxygenated PAHs (OPAHs), and nitrated phenols (NPs) in PM2.5 were all increased during the heating season. Biomass burning was identified to be the primary source of these aromatic compounds, particularly for PAHs. Phenol and nitrobenzene are two main primary precursors for 4NP, with phenol showing lower reaction barriers. P-Cresol was identified as the primary precursor for the formation of 4-methyl-5-nitrocatechol.
03 Jan 2025
Volcanic emission estimates from the inversion of ACTRIS lidar observations and their use for quantitative dispersion modelling
Anna Kampouri, Vassilis Amiridis, Thanasis Georgiou, Stavros Solomos, Anna Gialitaki, Maria Tsichla, Michael Rennie, Simona Scollo, and Prodromos Zanis
EGUsphere, https://doi.org/10.5194/egusphere-2024-3181, https://doi.org/10.5194/egusphere-2024-3181, 2025
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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This study proposes a novel inverse modeling framework coupled with remote sensing data for improving volcanic ash dispersion forecasts, essential for aviation safety. By integrating FLEXPART dispersion model outputs with ground-based ACTRIS lidar observations, the approach estimates Etna's volcanic particle emissions and highlights significant enhancement of the forecast accuracy.
02 Jan 2025
Preparing for an extensive ∆14CO2 flask sample monitoring campaign over Europe to constrain fossil CO2 emissions
Carlos Gómez-Ortiz, Guillaume Monteil, Ute Karstens, and Marko Scholze
EGUsphere, https://doi.org/10.5194/egusphere-2024-3013, https://doi.org/10.5194/egusphere-2024-3013, 2025
Preprint under review for ACP (discussion: open, 1 comment)
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In 2024, an intensive sampling campaign is being conducted to improve fossil CO₂ emission estimates in Europe using 14C measurements. By testing different strategies for selecting air samples, this study shows that increasing sample frequency and carefully choosing samples based on their fossil fuel and nuclear content leads to more accurate results, reducing the uncertainty and bias of the estimates.
20 Dec 2024
A 60-year atmospheric nitrate isotope record from a Southeast Greenland ice core with minimal post-depositional alteration
Zhao Wei, Shohei Hattori, Asuka Tsuruta, Zhuang Jiang, Sakiko Ishino, Koji Fujita, Sumito Matoba, Lei Geng, Alexis Lamothe, Ryu Uemura, Naohiro Yoshida, Joel Savarino, and Yoshinori Iizuka
EGUsphere, https://doi.org/10.5194/egusphere-2024-3937, https://doi.org/10.5194/egusphere-2024-3937, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Nitrate isotope records in ice cores reveal changes in NOₓ emissions, atmospheric acidity, and oxidation chemistry driven by human activity. However, nitrate in snow can be altered by UV-driven post-depositional processes, making snow accumulation rates critical for preserving these records. This study examines nitrate isotopes in an SE-Dome ice core, where high snow accumulation minimizes these effects, providing a reliable archive of atmospheric nitrogen cycling.
20 Dec 2024
Retention During Freezing of Raindrops, Part II: Investigation of Ambient Organics from Beijing Urban Aerosol Samples
Jackson Seymore, Martanda Gautam, Miklós Szakáll, Alexander Theis, Thorsten Hoffmann, Jialiang Ma, Lingli Zhou, and Alexander Vogel
EGUsphere, https://doi.org/10.5194/egusphere-2024-3940, https://doi.org/10.5194/egusphere-2024-3940, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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We investigated the chemical retention of water-soluble organic compounds in Beijing aerosols using an acoustic levitator and drop freezing experiments. Samples from PM2.5 filter extracts were frozen at -15 °C without artificial nucleators and analyzed using ultra-high resolution mass spectrometry. Our findings reveal a nonnormal distribution of retention coefficients that differs from current literature on cloud droplets.
20 Dec 2024
Natural and anthropogenic influence on tropospheric ozone variability over the Tropical Atlantic unveiled by satellite and in situ observations
Sachiko Okamoto, Juan Cuesta, Gaëlle Dufour, Maxmim Eremenko, Kazuyuki Miyazaki, Cathy Boonne, Hiroshi Tanimoto, Jeff Peischl, and Chelsea Thompson
EGUsphere, https://doi.org/10.5194/egusphere-2024-3758, https://doi.org/10.5194/egusphere-2024-3758, 2024
Preprint under review for ACP (discussion: final response, 6 comments)
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We analyse the distribution of tropospheric ozone over the South and Tropical Atlantic during February 2017 using a multispectral satellite approach called IASI+GOME2, three chemistry reanalysis products and in situ airborne measurements. It reveals that a significant overestimation of three chemistry reanalysis products of lowermost troposphere ozone over the Atlantic in the Northern Hemisphere due to the overestimations of ozone precursors from anthropogenic sources from North America.
20 Dec 2024
CH4 emissions from Northern Europe wetlands: compared data assimilation approaches
Guillaume Monteil, Jalisha Theanutti Kallingal, and Marko Scholze
EGUsphere, https://doi.org/10.5194/egusphere-2024-3122, https://doi.org/10.5194/egusphere-2024-3122, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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Methane is a potent greenhouse gas, emitted both from natural and anthropogenic processes. Large uncertainties remain on its emission budget. Our study compares and combines two approaches to estimate European methane emissions, with a focus on wetlands, based on observed atmospheric CH4 concentrations and in-situ flux measurements. We find a good agreement and complementarity between the approaches, and identify obstacles towards a more integrated data-informed emission estimation system.
20 Dec 2024
Simulated mixing in the UTLS by small-scale turbulence using multi-scale chemistry-climate model MECO(n)
Chun Hang Chau, Peter Hoor, and Holger Tost
EGUsphere, https://doi.org/10.5194/egusphere-2024-3805, https://doi.org/10.5194/egusphere-2024-3805, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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This study examines how the turbulence in the upper troposphere/lower stratosphere could modify the tracer distribution under different situations. Using a multi-scale chemistry model, we find that both the pre-existing tracer gradient and the dynamical and thermodynamically forcing play a role in modifying the tracer distribution. These results allow further research on the UTLS turbulent mixing and its implications for the climate system.
19 Dec 2024
Ice Nucleating Properties of Glassy Organic and Organosulfate Aerosol
Christopher Nathan Rapp, Sining Niu, N. Cazimir Armstrong, Xiaoli Shen, Thomas Berkemeier, Jason D. Surratt, Yue Zhang, and Daniel J. Cziczo
EGUsphere, https://doi.org/10.5194/egusphere-2024-3935, https://doi.org/10.5194/egusphere-2024-3935, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Atmospheric ice formation is initiated by particulate matter suspended in air and has profound impacts on Earth’s climate. This study focuses on examining the effectiveness of ice formation by a subset of particles composed of organic and sulfate. We used experiments and computer modeling to obtain the result that these particles are not effective ice nuclei, suggesting molecular structure is important for ice formation on these types of particles.
19 Dec 2024
Fluorescence spectra of atmospheric aerosols
Jens Reichardt, Felix Lauermann, and Oliver Behrendt
EGUsphere, https://doi.org/10.5194/egusphere-2024-3928, https://doi.org/10.5194/egusphere-2024-3928, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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Optical remote sensing systems, so-called lidars, are used to learn more about aerosols, which play an important role in atmospheric processes. The present study demonstrates that lidars, which measure the backscattering behavior of aerosols over the entire visible wavelength range, can increase our knowledge of the spatial and temporal occurrence of aerosol layers, the type of aerosol and their interaction with clouds. The focus of the publication is on wildfire aerosol and Saharan dust.
19 Dec 2024
Retention During Freezing of Raindrops, Part I: Investigation of Single and Binary Mixtures
Martanda Gautam, Alexander Theis, Jackson Seymore, Moritz Hey, Stephan Borrmann, Karoline Diehl, Subir K. Mitra, and Miklós Szakáll
EGUsphere, https://doi.org/10.5194/egusphere-2024-3917, https://doi.org/10.5194/egusphere-2024-3917, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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We investigated the retention of chemical species and their binary mixtures during freezing of raindrops via acoustic levitation. Our results reveal high retention-nearly all substances being fully retained during freezing. This could be attributed to faster freezing time compared to slower mass expulsion time, along with ice-shell formation during freezing. This result helps improve our understanding of interaction between ice microphysical processes and chemistry in deep convective clouds.
19 Dec 2024
Comparative ozone production sensitivity to NOx and VOCs in Quito, Ecuador and Santiago, Chile: implications for control strategies in times of climate action
María Cazorla, Melissa Trujillo, Rodrigo Seguel, and Laura Gallardo
EGUsphere, https://doi.org/10.5194/egusphere-2024-3720, https://doi.org/10.5194/egusphere-2024-3720, 2024
Revised manuscript under review for ACP (discussion: final response, 12 comments)
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The current climate emergency imposes the need to take actions in cities to curb ozone as a pollutant and a climate forcer. In this work we analyze how reducing the levels of ozone precursor would affect photochemical smog in Quito, Ecuador and Santiago, Chile. Results show that if environmental policy were implemented to reduce only nitrogen oxides, the production of ozone would increase substantially for which more integral solutions are needed.
19 Dec 2024
Quantifying biases in TROPESS AIRS, CrIS, and joint AIRS+OMI tropospheric ozone products using ozonesondes
Elyse A. Pennington, Gregory B. Osterman, Vivienne H. Payne, Kazuyuki Miyazaki, Kevin W. Bowman, and Jessica L. Neu
EGUsphere, https://doi.org/10.5194/egusphere-2024-3701, https://doi.org/10.5194/egusphere-2024-3701, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Tropospheric ozone is a harmful pollutant & powerful greenhouse gas. For satellite products to accurately quantify trends in tropospheric ozone, they must have low bias compared to a reliable source of data. This study compares 3 TROPESS satellite products – CrIS, AIRS, & AIRSOMI – to ozonesonde data. They have low global measurement bias & thus can be used to detect global tropospheric ozone trends, but the measurement bias should be considered in certain regions & time periods.
19 Dec 2024
Iron isotopes reveal significant aerosol dissolution over the Pacific Ocean
Capucine Camin, François Lacan, Catherine Pradoux, Marie Labatut, Anne Johansen, and James W. Murray
EGUsphere, https://doi.org/10.5194/egusphere-2024-3777, https://doi.org/10.5194/egusphere-2024-3777, 2024
Revised manuscript under review for ACP (discussion: final response, 11 comments)
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This manuscript presents the chemical composition of aerosols (> 1µm) over the Equatorial and Tropical Pacific Ocean, presenting the first measurements of iron isotopes in aerosols from this region. Iron concentrations and isotopes were determined using a Neptune MC-ICPMS. Our data analysis reveals that a significant portion of the aerosols undergo dissolution and removal during atmospheric transport. These findings contribute to original conclusions about the chemistry and physics of aerosols.
19 Dec 2024
Relationships Between Surface Fluxes and Boundary Layer Dynamics: Statistics at the Land-Atmosphere Feedback Observatory (LAFO)
Syed Saqlain Abbas, Andreas Behrendt, Oliver Branch, and Volker Wulfmeyer
EGUsphere, https://doi.org/10.5194/egusphere-2024-3878, https://doi.org/10.5194/egusphere-2024-3878, 2024
Revised manuscript under review for ACP (discussion: final response, 5 comments)
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This study investigates turbulence statistics convective boundary layer. For this, we used data of two Doppler lidars, and an eddy covariance station between May to July 2021. We believe that these statistics are important to improve the land-atmosphere characterization in numerical weather prediction models.
18 Dec 2024
Saharan dust linked to European hail events
Killian P. Brennan and Lena Wilhelm
EGUsphere, https://doi.org/10.5194/egusphere-2024-3924, https://doi.org/10.5194/egusphere-2024-3924, 2024
Preprint under review for ACP (discussion: open, 2 comments)
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In this study, we discovered that natural dust carried into Europe significantly increases the likelihood of hailstorms. By analyzing dust data, weather records, and hail reports, we found that moderate dust levels lead to more frequent hail, while very high or low dust amounts reduce it. Adding dust information into statistical models improved forecasting skills. We aimed to understand how dust affects hailstorms.
18 Dec 2024
On the Processes Determining the Slope of Cloud-Water Adjustments in Non-Precipitating Stratocumulus
Fabian Hoffmann, Yao-Sheng Chen, and Graham Feingold
EGUsphere, https://doi.org/10.5194/egusphere-2024-3893, https://doi.org/10.5194/egusphere-2024-3893, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Clouds reflect a substantial portion of the incoming solar radiation back into space. This capacity is determined by the number of cloud droplets, which in turn is influenced by the number of aerosol particles, forming the basis for aerosol-cloud-climate interactions. In this study, we use a simple mixed-layer approach to understand the effect of aerosol on cloud water in non-precipitating stratocumulus.
18 Dec 2024
Magnitude and timescale of liquid water path adjustments to cloud droplet number concentration perturbations for nocturnal non-precipitating marine stratocumulus
Yao-Sheng Chen, Prasanth Prabhakaran, Fabian Hoffmann, Jan Kazil, Takanobu Yamaguchi, and Graham Feingold
EGUsphere, https://doi.org/10.5194/egusphere-2024-3891, https://doi.org/10.5194/egusphere-2024-3891, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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Injecting sea salt aerosols into marine stratiform clouds can distribute the cloud water over more droplets in smaller sizes. This process is expected to make the clouds brighter, allowing them to reflect more sunlight back to space. However, it may also cause the clouds to lose water over time, reducing their ability to reflect sunlight. We use a computer model to show that the loss of cloud water occurs relatively quickly and does not completely offset the initial brightening.
18 Dec 2024
Aircraft Observations of Continental Pollution In the Equatorial Lower Stratosphere over the Tropical Western Pacific During Boreal Winter
Jasna V. Pittman, Bruce C. Daube, Steven C. Wofsy, Elliot L. Atlas, Maria A. Navarro, Eric J. Hintsa, Fred L. Moore, Geoff S. Dutton, James W. Elkins, Troy D. Thornberry, Andrew W. Rollins, Eric J. Jensen, Thaopaul Bui, Jonathan M. Dean-Day, and Leonhard Pfister
EGUsphere, https://doi.org/10.5194/egusphere-2024-3832, https://doi.org/10.5194/egusphere-2024-3832, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Wildfires emit aerosols and precursors that once in the stratosphere could initiate stratospheric ozone loss. The Airborne Tropical TRopopause EXperiment campaign sampled the western Pacific, the dominant longitudes where surface air lofted by convection enters the global stratosphere. Aircraft measurements provided evidence of persistent pollution layers of biomass burning character at these longitudes in the lower stratosphere, largely originating from distant fires over Africa and Indonesia.
17 Dec 2024
Marine emissions and trade winds control the atmospheric nitrous oxide in the Galapagos Islands
Timur Cinay, Dickon Young, Nazaret Narváez Jimenez, Cristina Vintimilla-Palacios, Ariel Pila Alonso, Paul B. Krummel, William Vizuete, and Andrew R. Babbin
EGUsphere, https://doi.org/10.5194/egusphere-2024-3769, https://doi.org/10.5194/egusphere-2024-3769, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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We present the initial 15 months of nitrous oxide measurements from the Galapagos Emissions Monitoring Station. The observed variability in atmospheric mole fractions during this period can be linked to several factors: seasonal variations in trade wind speed and direction across the eastern Pacific, differences in the transport history of air masses sampled, and spatiotemporal heterogeneity in regional marine nitrous oxide emissions from coastal upwelling systems of Peru and Chile.
17 Dec 2024
Sectoral contributions of high-emitting methane point sources from major U.S. onshore oil and gas producing basins using airborne measurements from MethaneAIR
Jack D. Warren, Maryann Sargent, James P. Williams, Mark Omara, Christopher C. Miller, Sebastien Roche, Katlyn MacKay, Ethan Manninen, Apisada Chulakadabba, Anthony Himmelberger, Joshua Benmergui, Zhan Zhang, Luis Guanter, Steve Wofsy, and Ritesh Gautam
EGUsphere, https://doi.org/10.5194/egusphere-2024-3865, https://doi.org/10.5194/egusphere-2024-3865, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Mitigating anthropogenic methane emissions requires a detailed understanding of emitting facilities. We use observations of methane point sources from the MethaneAIR instrument from 2021–2023 that covered ~80 % of U.S. onshore oil and gas production regions. We attribute these observations to facility types to explore how emissions vary by industrial sectors. Oil and gas facilities make up most point source emissions nationally, but in certain basins other sectors can make up the majority.
17 Dec 2024
Evaluating Nitrogen Oxide and α-pinene Oxidation Chemistry: Insights from Oxygen and Nitrogen Stable Isotopes
Wendell W. Walters, Masayuki Takeuchi, Danielle E. Blum, Gamze Eris, David Tanner, Weiqi Xu, Jean Rivera-Rios, Fobang Liu, Tianchang Xu, Greg Huey, Justin B. Min, Rodney Weber, Nga L. Ng, and Meredith G. Hastings
EGUsphere, https://doi.org/10.5194/egusphere-2024-3860, https://doi.org/10.5194/egusphere-2024-3860, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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We studied how chemicals released from plants and pollution interact in the atmosphere, affecting air quality and climate. By combining laboratory experiments and chemistry models, we tracked unique chemical fingerprints to understand how nitrogen compounds transform to form particles in the air. Our findings help explain the role of these reactions in pollution and provide tools to improve predictions for cleaner air and better climate policies.
17 Dec 2024
Impact of Topographic Wind Conditions on Dust Particle Size Distribution: Insights from a Regional Dust Reanalysis Dataset
Xinyue Huang, Wenyu Gao, and Hosein Foroutan
EGUsphere, https://doi.org/10.5194/egusphere-2024-3076, https://doi.org/10.5194/egusphere-2024-3076, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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This study investigates the relationship between wind-blown dust aerosols size distribution and wind conditions over topography at a regional scale, utilizing 10 years of dust reanalysis data. Linear regression models suggest that higher wind speeds and steeper land slopes, particularly under uphill winds, are associated with increased fractions of coarser dust particles. Moreover, these positive correlations weaken during summer and afternoon events, likely related to the haboob storms.
17 Dec 2024
Tropospheric ozone trends and attributions over East and Southeast Asia in 1995–2019: An integrated assessment using statistical methods, machine learning models, and multiple chemical transport models
Xiao Lu, Yiming Liu, Jiayin Su, Xiang Weng, Tabish Ansari, Yuqiang Zhang, Guowen He, Yuqi Zhu, Haolin Wang, Ganquan Zeng, Jingyu Li, Cheng He, Shuai Li, Teerachai Amnuaylojaroen, Tim Butler, Qi Fan, Shaojia Fan, Grant L. Forster, Meng Gao, Jianlin Hu, Yugo Kanaya, Mohd Talib Latif, Keding Lu, Philippe Nédélec, Peer Nowack, Bastien Sauvage, Xiaobin Xu, Lin Zhang, Ke Li, Ja-Ho Koo, and Tatsuya Nagashima
EGUsphere, https://doi.org/10.5194/egusphere-2024-3702, https://doi.org/10.5194/egusphere-2024-3702, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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This study analyzes summertime ozone trends in East and Southeast Asia derived from a comprehensive observational database spanning from 1995 to 2019, incorporating aircraft observations, ozonesonde data, and measurements from 2500 surface sites. Multiple models are applied to attribute to changes in anthropogenic emissions and climate. The results highlight increases in anthropogenic emission are the primary driver of ozone increases both in the free troposphere and at the surface.
16 Dec 2024
Long-term satellite trends of European lower-tropospheric ozone from 1996–2017
Matilda A. Pimlott, Richard J. Pope, Brian J. Kerridge, Richard Siddans, Barry G. Latter, Wuhu Feng, and Martyn P. Chipperfield
EGUsphere, https://doi.org/10.5194/egusphere-2024-3717, https://doi.org/10.5194/egusphere-2024-3717, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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Tropospheric ozone (O3) is a harmful secondary atmospheric pollutant and an important greenhouse gas. Here, we present an in-depth analysis of lower-tropospheric sub-column O3 (LTCO3, surface – 6 km) records from three satellite products produced by the Rutherford Appleton Laboratory (RAL) over Europe between 1996 and 2017. Overall, we detect moderate negative trends in the satellite records, but corresponding model simulations and ozonesonde measurements show negligible trends.
16 Dec 2024
Strong aerosol indirect radiative effect from dynamic-driven diurnal variations of cloud water adjustments
Jiayi Li, Yang Wang, Jiming Li, Weiyuan Zhang, Lijie Zhang, and Yuan Wang
EGUsphere, https://doi.org/10.5194/egusphere-2024-3601, https://doi.org/10.5194/egusphere-2024-3601, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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A key challenge in climate projections is the uncertainty in cloud water response to anthropogenic aerosols, especially its time-dependence on diurnal microphysical-dynamic boundary layer feedback. Geostationary satellite shows neglecting the variations induces a compensation up to 45% of the initial cooling effect from increased cloud droplet concentration. The results provide new insights in aerosol-cloud interactions, verifying this is a significant yet often overlooked source of uncertainty.
16 Dec 2024
Adiabatic and radiative cooling are both important causes of aerosol activation in simulated fog events in Europe
Pratapaditya Ghosh, Ian Boutle, Paul Field, Adrian Hill, Marie Mazoyer, Katherine J. Evans, Salil Mahajan, Hyun-Gyu Kang, Min Xu, Wei Zhang, and Hamish Gordon
EGUsphere, https://doi.org/10.5194/egusphere-2024-3397, https://doi.org/10.5194/egusphere-2024-3397, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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We study the lifecycle of fog events in Europe using a weather and climate model. By incorporating droplet formation and growth driven by radiative cooling, our model better simulates the total liquid water in foggy atmospheric columns. We show that both adiabatic and radiative cooling play significant, often equally important roles in driving droplet formation and growth. We discuss strategies to address droplet number overpredictions, by improving model physics and addressing model artifacts.
16 Dec 2024
High sensitivity of simulated fog properties to parameterized aerosol activation in case studies from ParisFog
Pratapaditya Ghosh, Ian Boutle, Paul Field, Adrian Hill, Anthony Jones, Marie Mazoyer, Katherine J. Evans, Salil Mahajan, Hyun-Gyu Kang, Min Xu, Wei Zhang, Noah Asch, and Hamish Gordon
EGUsphere, https://doi.org/10.5194/egusphere-2024-3376, https://doi.org/10.5194/egusphere-2024-3376, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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We study aerosol-fog interactions near Paris using a weather and climate model with high spatial resolution. We show that our model can simulate fog lifecycle effectively. We find that the fog droplet number concentrations, the amount of liquid water in the fog, and the vertical structure of the fog are highly sensitive to the parameterization that simulates droplet formation and growth. The changes we propose could improve fog forecasts significantly without increasing computational costs.
16 Dec 2024
Uncovering the Impact of Urban Functional Zones on Air Quality in China
Lulu Yuan, Wenchao Han, Jiachen Meng, Yang Wang, Haojie Yu, and Wenze Li
EGUsphere, https://doi.org/10.5194/egusphere-2024-3350, https://doi.org/10.5194/egusphere-2024-3350, 2024
Preprint under review for ACP (discussion: open, 3 comments)
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This study utilizes multi-source data to reveal the impact of various urban functional zones in China on the spatial distribution of pollutants. The findings indicate that the residential and commercial zones see notable air quality gains, but the improvement of air quality in the transportation zone is the least considerable. Moreover, the industrial zone has the most seasonal air quality variation. Therefore, air pollution prevention policies should consider differences in functional zones.
16 Dec 2024
Analysis of raindrop size distribution from the double moment cloud microphysics scheme for monsoon over a tropical station
Kadavathu Sreekumar Apsara, Jayakumar Aravindakshan, Anurose Theethai Jacob, Saji Mohandas, Paul Field, Hamish Gordan, Thara Prabhakaran, Mahen Konwar, and Vijapurap Srinivasa Prasad
EGUsphere, https://doi.org/10.5194/egusphere-2024-3538, https://doi.org/10.5194/egusphere-2024-3538, 2024
Preprint under review for ACP (discussion: final response, 4 comments)
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Science has made significant strides in weather prediction, especially for intense tropical rainfall that can lead to floods and landslides. Our study aims to improve monsoon rainfall forecasts by analyzing raindrop sizes. Using a new approach to model raindrop growth, we achieved a more accurate depiction of large rainfall events. These improvements can be generalized to enhance early warning systems, offering reliable predictions that help reduce risks from severe tropical weather events.
16 Dec 2024
Aerosol hygroscopicity over the South-East Atlantic Ocean during the biomass burning season: Part II – Influence of burning conditions on CCN hygroscopicity
Haochi Che, Lu Zhang, Michal Segal-Rozenhaimer, Caroline Dang, Paquita Zuidema, and Arthur J. Sedlacek III
EGUsphere, https://doi.org/10.5194/egusphere-2024-3304, https://doi.org/10.5194/egusphere-2024-3304, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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We investigated how biomass burning (BB) affects cloud formation in the southeast Atlantic. We found that aerosol hygroscopicity, which influences cloud droplet formation, varied monthly and differed significantly between 2016 and 2017, due to changes in sulfate aerosols. These changes were driven by BB burning conditions, which were likely influenced by meteorological factors. This study highlights the important role of BB in shaping aerosol properties and clouds in the region.
13 Dec 2024
Secondary Organic Aerosol Formation from Nitrate Radical Oxidation of Styrene: Aerosol Yields, Chemical Composition, and Hydrolysis of Organic Nitrates
Yuchen Wang, Xiang Zhang, Yuanlong Huang, Yutong Liang, and Nga L. Ng
EGUsphere, https://doi.org/10.5194/egusphere-2024-3849, https://doi.org/10.5194/egusphere-2024-3849, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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This work provides the first fundamental laboratory data to evaluate SOA production from styrene+NO3 chemistry. Additionally, the formation mechanisms of aromatic ONs are reported for the first time, highlighting that previously identified nitroaromatics in ambient field campaigns can be aromatic ONs. Finally, the hydrolysis lifetime observed for ONs generated from styrene+NO3 oxidation can serve as experimentally constrained parameter for modeling hydrolysis of aromatic ONs in general.
13 Dec 2024
On the impact of thunder on cloud ice crystals and droplets
Konstantinos Kourtidis, Stavros Stathopoulos, and Vassilis Amiridis
EGUsphere, https://doi.org/10.5194/egusphere-2024-3314, https://doi.org/10.5194/egusphere-2024-3314, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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The loud sound of thunder will induce mechanical effects on cloud droplets and ice particles, causing changes in their size distribution.
13 Dec 2024
Hemispheric differences in ozone across the stratosphere-troposphere exchange region
Rodrigo J. Seguel, Charlie Opazo, Yann Cohen, Owen R. Cooper, Laura Gallardo, Björn-Martin Sinnhuber, Florian Obersteiner, Andreas Zahn, Peter Hoor, and Susanne Rohs
EGUsphere, https://doi.org/10.5194/egusphere-2024-3719, https://doi.org/10.5194/egusphere-2024-3719, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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We explored differences in ozone levels between the Northern and Southern Hemispheres in the Stratosphere-troposphere exchange region. Using unique data from a research aircraft, we found significantly lower ozone levels (with stratospheric character) in the Southern Hemisphere, especially during years of severe ozone depletion. A Sudden Stratospheric Warming event in 2019 increased Southern Hemisphere ozone levels, highlighting the relationship between atmospheric events and ozone distribution.
13 Dec 2024
Explaining trends and changing seasonal cycles of surface ozone in North America and Europe over the 2000–2018 period: A global modelling study with NOx and VOC tagging
Tabish Ansari, Aditya Nalam, Aurelia Lupaşcu, Carsten Hinz, Simon Grasse, and Tim Butler
EGUsphere, https://doi.org/10.5194/egusphere-2024-3752, https://doi.org/10.5194/egusphere-2024-3752, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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Surface ozone can travel far from its sources. In recent decades, emissions of ozone-forming gases have decreased in North America and Europe but risen in Asia, alongside rising global methane levels. Using advanced modeling, this study reveals that while local reductions in nitrogen oxides have lowered summer ozone, increases in natural and foreign sources offset these gains. Methane remains important, but its ozone impact has declined with reduced local emissions.
12 Dec 2024
Complementary aerosol mass spectrometry elucidates sources of wintertime sub-micron particle pollution in Fairbanks, Alaska, during ALPACA 2022
Amna Ijaz, Brice Temime-Roussel, Benjamin Chazeau, Sarah Albertin, Stephen R. Arnold, Brice Barrett, Slimane Bekki, Natalie Brett, Meeta Cesler-Maloney, Elsa Dieudonne, Kayane K. Dingilian, Javier G. Fochesatto, Jingqiu Mao, Allison Moon, Joel Savarino, William Simpson, Rodney J. Weber, Kathy S. Law, and Barbara D'Anna
EGUsphere, https://doi.org/10.5194/egusphere-2024-3789, https://doi.org/10.5194/egusphere-2024-3789, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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Fairbanks is among the most polluted cities with the highest particulate matter (PM) levels in the US during winters. Highly time-resolved measurements of the sub-micron PM elucidated residential heating with wood and oil and hydrocarbon-like organics from traffic, as well as sulphur-containing organic aerosol, to be the key pollution sources. Remarkable differences existed between complementary instruments, warranting the deployment of multiple tools at sites with wide-ranging influences.
12 Dec 2024
Seasonal differences in observed versus modeled new particle formation over boreal regions
Carl Svenhag, Pontus Roldin, Tinja Olenius, Robin Wollesen de Jonge, Sara Blichner, Daniel Yazgi, and Moa Sporre
EGUsphere, https://doi.org/10.5194/egusphere-2024-3626, https://doi.org/10.5194/egusphere-2024-3626, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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This study investigates the model representation of how particles are formed and grow in the atmosphere. Using modeled and observed data from two boreal forest stations in 2018, we identify key factors for NPF to improve particle-climate predictions in the global EC-Earth3 model. Comparisons with the detailed ADCHEM model show that adding ammonia improves particle growth predictions, though EC-Earth3 still highly underestimates the number of particles during warmer months.
12 Dec 2024
Advances in CALIPSO (IIR) cirrus cloud property retrievals – Part 2: Global estimates of the fraction of cirrus clouds affected by homogeneous ice nucleation
David L. Mitchell and Anne Garnier
EGUsphere, https://doi.org/10.5194/egusphere-2024-3814, https://doi.org/10.5194/egusphere-2024-3814, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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Arguably the greatest knowledge gap in cirrus cloud research is the relative roles of homogeneous and heterogeneous ice nucleation in cirrus cloud formation. Since this depends on temperature, latitude, season, and topography, a satellite remote sensing method was developed to measure cirrus cloud properties. It was found that cirrus clouds strongly affected by homogeneous ice nucleation may account for over half of the overall cirrus cloud radiative effect during winter outside the tropics.
12 Dec 2024
Advances in CALIPSO (IIR) cirrus cloud property retrievals – Part 1: Methods and testing
David L. Mitchell, Anne Emilie Garnier, and Sarah Woods
EGUsphere, https://doi.org/10.5194/egusphere-2024-3790, https://doi.org/10.5194/egusphere-2024-3790, 2024
Preprint under review for ACP (discussion: open, 1 comment)
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Motivated by the need to better understand the physics of cirrus clouds, a satellite retrieval for cirrus cloud ice water content, ice particle number concentration and effective size was developed by exploiting relationships between cirrus cloud measurements made during field campaigns and cloud radiative properties measured by satellite. These retrievals tested favorably when compared against corresponding aircraft measurements and were found to depend on the visual opacity of the cloud.
12 Dec 2024
BVOC and speciated monoterpene concentrations and fluxes at a Scandinavian boreal forest
Ross Charles Petersen, Thomas Holst, Cheng Wu, Radovan Krejci, Jeremy Chan, Claudia Mohr, and Janne Rinne
EGUsphere, https://doi.org/10.5194/egusphere-2024-3410, https://doi.org/10.5194/egusphere-2024-3410, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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Ecosystem-scale emissions of biogenic volatile organic compounds (BVOCs) are important for atmospheric chemistry. Here we investigate boreal BVOC fluxes from a forest in central Sweden. BVOC fluxes were measured above-canopy using proton-transfer-reaction mass spectrometry, while compound-specific monoterpene (MT) fluxes were assessed using a concentration gradient method. We also evaluate the impact of chemical degradation on observed sesquiterpene (SQT) and nighttime MT fluxes.
11 Dec 2024
Technical note: An interactive dashboard to facilitate quality control of in-situ atmospheric composition measurements
Yuri Brugnara, Martin Steinbacher, Simone Baffelli, and Lukas Emmenegger
EGUsphere, https://doi.org/10.5194/egusphere-2024-3556, https://doi.org/10.5194/egusphere-2024-3556, 2024
Preprint under review for ACP (discussion: open, 1 comment)
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GAW-QC is an interactive dashboard for the quality control of in-situ atmospheric composition measurements made at stations taking part in the Global Atmosphere Watch network. Even though it is mainly targeted at station operators who want to analyze recent, not yet published measurements, it allows anybody to verify the quality of already published measurements using various anomaly detection algorithms as well as visual comparisons.
11 Dec 2024
Source-explicit estimation of brown carbon in the polluted atmosphere over North China Plain: implications for distribution, absorption and direct radiative effect
Jiamao Zhou, Jiarui Wu, Xiaoli Su, Ruonan Wang, Xia Li, Qian Jiang, Ting Zhang, Wenting Dai, Junji Cao, Xuexi Tie, and Guohui Li
EGUsphere, https://doi.org/10.5194/egusphere-2024-3468, https://doi.org/10.5194/egusphere-2024-3468, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Brown carbon (BrC) is a type of airborne particle produced from various combustion sources which is light absorption. Historically, climate models have categorizing organic particles as either non-absorbing or purely reflective. Our study shows that BrC can reduce the usual cooling effect of organic particles. While BrC is often linked to biomass burning, however, BrC from fossil fuels contributes significantly to atmospheric heating.
11 Dec 2024
Enhancing SO3 Hydrolysis and Nucleation: The Role of Formic Sulfuric Anhydride
Rui Wang, Rongrong Li, Shasha Chen, Ruxue Mu, Changming Zhang, Xiaohui Ma, Majid Khan, and Tianlei Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2024-3275, https://doi.org/10.5194/egusphere-2024-3275, 2024
Revised manuscript accepted for ACP (discussion: final response, 16 comments)
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Gaseous results indicated that SO3 hydrolysis with formic sulfuric anhydride (FSA) has a Gibbs free energy barrier as low as 1.5 kcal·mol-1 and can effectively compete with other SO3 hydrolysis, Interfacial BOMD simulations illustrated that FSA-mediated SO3 hydrolysis at the gas-liquid interface occurs through a stepwise mechanism and can be completed within a few picoseconds. ACDC kinetic simulations indicated that FSA significantly enhances cluster formation rates in the H2SO4-NH3 system.
10 Dec 2024
Quantifying cloud masking in a single column
Lukas Kluft, Bjorn Stevens, Manfred Brath, and Stefan A. Buehler
EGUsphere, https://doi.org/10.5194/egusphere-2024-3829, https://doi.org/10.5194/egusphere-2024-3829, 2024
Preprint under review for ACP (discussion: final response, 10 comments)
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Using a single column model, we investigate the effect of the vertical distribution of clouds on climate sensitivity. We show that, depending on their height, clouds can mask or unmask the radiative response of the clear-sky atmosphere. Our single column model yields an all-sky climate sensitivity of 2.2 K, slightly less than the clear-sky value. This value can be interpreted as a baseline to which changes in surface albedo and an assumed reduction in cloud albedo would add.
10 Dec 2024
VOC sources and impacts at an urban Mediterranean area (Marseille – France)
Marvin Dufresne, Thérèse Salameh, Thierry Léonardis, Grégory Gille, Alexandre Armengaud, and Stéphane Sauvage
EGUsphere, https://doi.org/10.5194/egusphere-2024-3576, https://doi.org/10.5194/egusphere-2024-3576, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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This paper is about the eighteen-months measurement of Non-Methane Hydrocarbons (NMHC) at Marseille, were there was no measurement since early 2000 despite the impact of NMHC on air quality and climate. The traffic related sources are the first contributor to NMHC concentrations in Marseille and shipping strongly contribute to the formation of aerosols. Finally, the lockdown due to the Covid-19 had an impact on NMHC concentrations reaching a fifty percents decreasing for traffic-related sources.
10 Dec 2024
Sensitivity of climate-chemistry model simulated atmospheric composition to lightning-produced NOx parameterizations based on lightning frequency
Francisco J. Pérez-Invernón, Francisco J. Gordillo-Vázquez, Heidi Huntrieser, Patrick Jöckel, and Eric J. Bucsela
EGUsphere, https://doi.org/10.5194/egusphere-2024-3348, https://doi.org/10.5194/egusphere-2024-3348, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Lightning plays a significant role in tropospheric chemistry by producing substantial amounts of nitrogen oxides. According to recent estimates, thunderstorms that produce a higher lightning frequency rate also produce less nitrogen oxide per flash. We implemented the dependency of nitrogen oxide production per flash on lightning flash frequency in a chemical atmospheric model.
09 Dec 2024
New insights into the polar ozone and water vapor, radiative effects, and their connection to the tides in the mesosphere-lower thermosphere during major Sudden Stratospheric Warming events
Guochun Shi, Hanli Liu, Masaki Tsutsumi, Njål Gulbrandsen, Alexander Kozlovsky, Dimitry Pokhotelov, Mark Lester, Kun Wu, and Gunter Stober
EGUsphere, https://doi.org/10.5194/egusphere-2024-3749, https://doi.org/10.5194/egusphere-2024-3749, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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People are increasingly concerned about climate change due to its widespread impacts, including rising temperatures, extreme weather events, and ecosystem disruptions. Addressing these challenges requires urgent global action to reduce greenhouse gas emissions and adapt to a rapidly changing environment.
09 Dec 2024
In-cloud characteristics observed in US Northeast and Midwest non-orographic winter storms with implications for ice particle mass growth and residence time
Luke R. Allen, Sandra E. Yuter, Declan M. Crowe, Matthew A. Miller, and K. Lee Thornhill
EGUsphere, https://doi.org/10.5194/egusphere-2024-3808, https://doi.org/10.5194/egusphere-2024-3808, 2024
Revised manuscript under review for ACP (discussion: final response, 8 comments)
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We analyzed in-cloud characteristics using in situ measurements from 42 research flights across two field campaigns into non-orographic, non-lake effect winter storms. Much of the storm volume contains weak vertical motions (a few cm s-1), and most updrafts ≥ 0.5 m s-1 are small (< 1 km). Within 2 km of cloud radar echo top, stronger vertical motions and conditions for ice particle growth are more common. This implies the importance of cloud-top generating cells for production of snow particles.
09 Dec 2024
Microphysical properties of refractory black carbon aerosols for different air masses at a central European background site
Yifan Yang, Thomas Müller, Laurent Poulain, Samira Atabakhsh, Bruna A. Holanda, Jens Voigtländer, Shubhi Arora, and Mira L. Pöhlker
EGUsphere, https://doi.org/10.5194/egusphere-2024-3539, https://doi.org/10.5194/egusphere-2024-3539, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Black carbon (BC) is the major atmospheric aerosol that can absorb light and influence climate. We measured the physical properties of BC at a background site in Germany. In summer, BC particles were smaller and the mixture with other atmospheric components occurred during the daytime. In winter, emissions from residential heating significantly influenced BC's properties. Understanding these characteristics of BC can help improve aerosol optics simulation accuracy.
09 Dec 2024
Constraining elemental mercury air–sea exchange using long-term ground-based observations
Koketso Michelle Molepo, Johannes Bieser, Alkuin Maximilian Koenig, Ian Michael Hedgecock, Ralf Ebinghaus, Aurélien Dommergue, Olivier Magand, Hélène Angot, Oleg Travnikov, Lynwill Martin, Casper Labuschagne, Katie Read, and Yann Bertrand
EGUsphere, https://doi.org/10.5194/egusphere-2024-3722, https://doi.org/10.5194/egusphere-2024-3722, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Mercury exchange between the ocean and atmosphere is poorly understood due to limited in situ data. Here, using atmospheric mercury observations from ground-based monitoring stations along with air mass trajectories, we found that atmospheric Hg levels increase with air mass ocean exposure time, matching predictions for ocean mercury emissions. This finding indicates that ocean emissions directly influence atmospheric mercury levels and enables us to estimate these emissions on a global scale.
09 Dec 2024
Aerosol-cloud interactions in liquid-phase clouds under different meteorological and aerosol backgrounds
Jianqi Zhao, Xiaoyan Ma, and Johannes Quaas
EGUsphere, https://doi.org/10.5194/egusphere-2024-3662, https://doi.org/10.5194/egusphere-2024-3662, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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We conduct a comparative analysis of aerosol-cloud responses in liquid-phase clouds under different aerosol and meteorological conditions based on simulations using the WRF-Chem-SBM model. Our findings highlight the different effects of aerosols on clouds and precipitation, as well as variations in the roles of aerosol and meteorological factors influencing aerosol-cloud interactions, in different environment.
09 Dec 2024
Surface ozone trend variability across the United States and the impact of heatwaves (1990–2023)
Kai-Lan Chang, Brian C. McDonald, and Owen R. Cooper
EGUsphere, https://doi.org/10.5194/egusphere-2024-3674, https://doi.org/10.5194/egusphere-2024-3674, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Exposure to high levels of ozone can be harmful to human health. This study shows consistent and robust evidence of decreasing ozone extremes across much of the United States over 1990–2023, previously attributed to ozone precursor emission controls. Nevertheless, we also show that the increasing heatwave frequencies are likely to contribute to additional ozone exceedances, slowing the progress of decreasing the frequency of ozone exceedances.
09 Dec 2024
Moisture Budget Estimates Derived from Airborne Observations in an Arctic Atmospheric River During its Dissipation
Henning Dorff, Florian Ewald, Heike Konow, Mario Mech, Davide Ori, Vera Schemann, Andreas Walbröl, Manfred Wendisch, and Felix Ament
EGUsphere, https://doi.org/10.5194/egusphere-2024-3632, https://doi.org/10.5194/egusphere-2024-3632, 2024
Preprint under review for ACP (discussion: final response, 4 comments)
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Using observations of an Arctic Atmospheric River (AR) from a long-range research aircraft, we analyse how moisture transported into the Arctic by the AR is transformed and how it interacts with the Arctic environment. The moisture transport divergence is the main driver of local moisture change over time. Surface precipitation and evaporation are rather weak when averaged over extended AR sectors, although considerable heterogeneity of precipitation within the AR is observed.
06 Dec 2024
Evidence of successful methane mitigation in one of Europe's most important oil production region
Gerrit Kuhlmann, Foteini Stavropoulou, Stefan Schwietzke, Daniel Zavala-Araiza, Andrew Thorpe, Andreas Hueni, Lukas Emmenegger, Andreea Calcan, Thomas Röckmann, and Dominik Brunner
EGUsphere, https://doi.org/10.5194/egusphere-2024-3494, https://doi.org/10.5194/egusphere-2024-3494, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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A measurement campaign in 2019 found that methane emissions from oil and gas in Romania were significantly higher than reported. In 2021, our follow-up campaign using airborne remote sensing showed a marked decreases in emissions by 20–60 % due to improved infrastructure. The study highlights the importance of measurement-based emission monitoring and illustrates the value of a multi-scale assessment integrating ground-based observations with large-scale airborne remote sensing campaigns.
06 Dec 2024
Climate Forcing due to Future Ozone Changes: An intercomparison of metrics and methods
William J. Collins, Fiona M. O'Connor, Connor R. Barker, Rachael E. Byrom, Sebastian D. Eastham, Øivind Hodnebrog, Patrick Jöckel, Eloise A. Marais, Mariano Mertens, Gunnar Myhre, Matthias Nützel, Dirk Olivié, Ragnhild Bieltvedt Skeie, Laura Stecher, Larry W. Horowitz, Vaishali Naik, Gregory Faluvegi, Ulas Im, Lee T. Murray, Drew Shindell, Kostas Tsigaridis, Nathan Luke Abraham, and James Keeble
EGUsphere, https://doi.org/10.5194/egusphere-2024-3698, https://doi.org/10.5194/egusphere-2024-3698, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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If reductions aren’t implemented to limit emissions of pollutants that produce ozone then we calculate that this will cause a warming of climate. We assess how the future warming from ozone is affected by changing meteorological variables such as clouds and atmospheric temperatures. We find that reductions in high cloud cover tend to slightly reduce the warming from ozone.
06 Dec 2024
Enrichment of organic nitrogen in fog residuals observed in the Italian Po Valley
Fredrik Mattsson, Almuth Neuberger, Liine Heikkinen, Yvette Gramlich, Marco Paglione, Matteo Rinaldi, Stefano Decesari, Paul Zieger, Ilona Riipinen, and Claudia Mohr
EGUsphere, https://doi.org/10.5194/egusphere-2024-3629, https://doi.org/10.5194/egusphere-2024-3629, 2024
Revised manuscript under review for ACP (discussion: final response, 5 comments)
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This study investigated aerosol-cloud interactions, focusing on organic nitrogen (ON) formation in the aqueous phase. Measurements were conducted in wintertime Italian Po Valley, using aerosol mass spectrometry. The fog was enriched in more hygroscopic inorganic compounds and ON, containing e.g. imidazoles. The formation of imidazole by aerosol-fog interactions could be confirmed for the first time in atmospheric observations. Findings highlight the role of fog in nitrogen aerosol formation.
06 Dec 2024
Kinematic properties of regions that can involve persistent contrails
Sina Maria Hofer and Klaus Martin Gierens
EGUsphere, https://doi.org/10.5194/egusphere-2024-3520, https://doi.org/10.5194/egusphere-2024-3520, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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Ice supersaturation is an immaterial feature, which does not generally move with the wind that carries contrails and cirrus clouds. Here we analyse the different motions and show that ice supersaturated regions (ISSRs) on average move slower than the wind, the direction of movement is usually quite similar and the distributions of both velocities follow Weibull distributions. The almost identical direction of the movements is beneficial for contrail lifetimes.
06 Dec 2024
Quantifying transboundary transport flux of CO over the Tibetan Plateau: variabilities and drivers
Zhenda Sun, Hao Yin, Zhongfeng Pan, Chongyang Li, Xiao Lu, Youwen Sun, and Cheng Liu
EGUsphere, https://doi.org/10.5194/egusphere-2024-3252, https://doi.org/10.5194/egusphere-2024-3252, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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This study investigates the variability and driving force of transboundary transport flux of carbon monoxide (CO) over the Tibetan Plateau from May 2018 to April 2024. We discovered that CO levels peak in late autumn and winter, driven mainly by external influx from South Asia, while internal emissions have decreased slightly. The findings reveal a growing trend in CO concentrations in the region, emphasizing the Tibetan Plateau's role as a significant receptor for transboundary pollutants.
06 Dec 2024
What makes the less urbanized city a deeper ozone trap: implications from a case study in the Sichuan Basin, southwest China
Chenxi Wang, Zheng Jin, Yang Liu, Mengxin Bai, Weijia Wang, Yingzhuo Yu, and Liantang Deng
EGUsphere, https://doi.org/10.5194/egusphere-2024-3180, https://doi.org/10.5194/egusphere-2024-3180, 2024
Preprint under review for ACP (discussion: open, 1 comment)
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Using near surface atmospheric pollutant reanalysis and remote sensing measurements, a dipole-like spatial pattern of near surface ozone trap across two megacities of the Sichuan Basin is demonstrated during 2013–2019. Unexpectedly, Chongqing has the deeper ozone trap compared to Chengdu despite its lower urbanization level. Results showed the ozone trap pattern aligns more closely with meteorological condition rather than chemical condition.
05 Dec 2024
Intended and Unintended Consequences of Atmospheric Methane Oxidation Enhancement
Hannah Marie Horowitz
EGUsphere, https://doi.org/10.5194/egusphere-2024-3139, https://doi.org/10.5194/egusphere-2024-3139, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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Removing the greenhouse gas methane from the atmosphere is being considered as an interim climate change solution. This includes increasing its chemical removal via oxidation. I simulate proposed methods in a computer model of the atmosphere. Results show that some approaches are unable to decrease methane on a global scale, while all increase particulate matter air pollution. There are climate and health tradeoffs of atmospheric oxidation enhancement of methane.
04 Dec 2024
Aerosol Composition Trends during 2000–2020: In depth insights from model predictions and multiple worldwide observation datasets
Alexandra P. Tsimpidi, Susanne M. C. Scholz, Alexandros Milousis, Nikolaos Mihalopoulos, and Vlassis A. Karydis
EGUsphere, https://doi.org/10.5194/egusphere-2024-3590, https://doi.org/10.5194/egusphere-2024-3590, 2024
Preprint under review for ACP (discussion: final response, 4 comments)
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This study examines global changes in air pollution from 2000 to 2020, focusing on fine aerosols that impact climate and health. Using models and global data, it finds organic aerosols dominate in many regions, especially with wildfires or natural emissions. Pollution from sulfate and nitrate has decreased in Europe and North America due to regulations, while trends in Asia are more complex. The findings improve understanding and support policies for cleaner air and healthier environments.
03 Dec 2024
Characterization of reactive nitrogen in the global upper troposphere using recent and historical commercial and research aircraft campaigns and GEOS-Chem
Nana Wei, Eloise A. Marais, Gongda Lu, Robert G. Ryan, and Bastien Sauvage
EGUsphere, https://doi.org/10.5194/egusphere-2024-3388, https://doi.org/10.5194/egusphere-2024-3388, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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This study uses reactive nitrogen observations from NASA DC-8 research aircraft and The In-service Aircraft for a Global Observing System (IAGOS) campaigns to characterise reactive nitrogen seasonality and composition in the global upper troposphere and to diagnose the greatest knowledge gaps from comparison to a state-of-science model GEOS-Chem that need to be resolved for climate, nitrogen cycle and air pollution assessments.
03 Dec 2024
Quantifying the decay rate of volcanic sulfur dioxide in the stratosphere
Paul A. Nicknish, Kane Stone, Susan Solomon, and Simon A. Carn
EGUsphere, https://doi.org/10.5194/egusphere-2024-3525, https://doi.org/10.5194/egusphere-2024-3525, 2024
Preprint under review for ACP (discussion: final response, 6 comments)
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Large volcanic eruptions can inject teragrams of sulfur dioxide (SO2) into the stratosphere, influencing stratospheric chemistry and Earth's climate. This work calculates lifetime of volcanic, gas-phase SO2 in the stratosphere using data from three satellite products. SO2 lifetimes vary significantly between the different products, and this uncertainty limits our ability to attribute an observed SO2 lifetime following an eruption to a specific chemical process.
02 Dec 2024
Analysis of a saline dust storm from the Aralkum Desert – Part 1: Consistency of multisensor satellite aerosol products
Xin Xi, Jun Wang, Zhendong Lu, Andrew Sayer, Jaehwa Lee, Robert Levy, Yujie Wang, Alexei Lyapustin, Hongqing Liu, Istvan Laszlo, Changwoo Ahn, Omar Torres, Sabur Abdullaev, and Ralph Kahn
EGUsphere, https://doi.org/10.5194/egusphere-2024-3416, https://doi.org/10.5194/egusphere-2024-3416, 2024
Revised manuscript under review for ACP (discussion: final response, 9 comments)
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Currently there are a number of satellite aerosol products available for dust research. The consistency between them is generally poor understood. This paper reveals significant inconsistency between different satellite sensors and techniques in observing the wind-blown saline dust from the Aralkum Desert, and demonstrates the potential of a multisensor approach for robust characterization of airborne dust over desert areas.
02 Dec 2024
Decrease of the European NOx anthropogenic emissions between 2005 and 2019 as seen from the OMI and TROPOMI NO2 satellite observations
Audrey Fortems-Cheiney, Grégoire Broquet, Robin Plauchu, Elise Potier, Antoine Berchet, Isabelle Pison, Adrien Martinez, Rimal Abeed, Gaelle Dufour, Adriana Coman, Dilek Savas, Guillaume Siour, Henk Eskes, Hugo A. C. Denier van der Gon, and Stijn N. C. Dellaert
EGUsphere, https://doi.org/10.5194/egusphere-2024-3679, https://doi.org/10.5194/egusphere-2024-3679, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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This study assesses the potential of the OMI and TROPOMI satellite observations to inform about the evolution of NOx anthropogenic emissions between year 2005 and year 2019 at the regional to national scales in Europe. Both the OMI and TROPOMI inversions show decreases in European NOx anthropogenic emission budgets between 2005 and 2019, but with different magnitudes.
02 Dec 2024
Exploring the Aerosol Activation Properties in a Coastal Area Using Cloud and Particle-resolving Models
Ge Yu, Yueya Wang, Zhe Wang, and Xiaoming Shi
EGUsphere, https://doi.org/10.5194/egusphere-2024-3581, https://doi.org/10.5194/egusphere-2024-3581, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Studying the cloud-forming capacity of aerosols is crucial in climate research. The PartMC model can provide detailed particle information and help these studies. This model is integrated with the ideal meteorological Cloud Model 1 (CM1) to simulate the aerosols at cloud-forming locations. Significant changes are revealed in the hygroscopicity distribution of aerosols within ascending air parcels. Additionally, different ascent times also affect aerosol aging processes.
02 Dec 2024
Polar winter climate change: strong local effects from sea ice loss, widespread consequences from warming seas
Tuomas Naakka, Daniel Köhler, Kalle Nordling, Petri Räisänen, Marianne Tronstad Lund, Risto Makkonen, Joonas Merikanto, Bjørn H. Samset, Victoria A. Sinclair, Jennie L. Thomas, and Annica L. M. Ekman
EGUsphere, https://doi.org/10.5194/egusphere-2024-3458, https://doi.org/10.5194/egusphere-2024-3458, 2024
Preprint under review for ACP (discussion: final response, 4 comments)
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The effects on polar climates of warmer sea surface temperatures and decreasing sea ice cover have been studied using four climate models with identical prescribed changes in sea surface temperatures and sea ice cover. The models predict similar changes in air temperature and precipitation in the polar regions in a warmer climate with less sea ice. However, the models disagree on how the atmospheric circulation, i.e. the large-scale winds, will change with warmer temperatures and less sea ice.
29 Nov 2024
Driving factors of aerosol acidity: a new hierarchical quantitative analysis framework and its application in Changzhou, China
Xiaolin Duan, Guangjie Zheng, Chuchu Chen, Qiang Zhang, and Kebin He
EGUsphere, https://doi.org/10.5194/egusphere-2024-3584, https://doi.org/10.5194/egusphere-2024-3584, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Aerosol acidity is an important parameter in atmospheric chemistry, while its driving factors, especially chemical profiles versus meteorological conditions, are not yet fully understood. Here, we established a hierarchical quantitative analysis framework to understand the driving factors of aerosol acidity on different time scales. Its application in Changzhou, China revealed distinct driving factors and corresponding mechanisms of aerosol acidity from annual trends to random residues.
29 Nov 2024
A new aggregation and riming discrimination algorithm based on polarimetric weather radars
Armin Blanke, Mathias Gergely, and Silke Trömel
EGUsphere, https://doi.org/10.5194/egusphere-2024-3336, https://doi.org/10.5194/egusphere-2024-3336, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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The area-wide radar-based distinction between riming and aggregation is crucial for model microphysics and data assimilation. This study introduces a discrimination algorithm based on polarimetric radar networks only. Exploiting the unique opportunity to link fall velocities from Doppler spectra to polarimetric variables in an operational setting enables us to set up and evaluate a well-performing machine learning algorithm.
27 Nov 2024
Regional transport of aerosols from Northern India and its impact on boundary layer dynamics and air quality over Chennai, a coastal megacity in Southern India
Saleem Ali, Chandan Sarangi, and Sanjay Kumar Mehta
EGUsphere, https://doi.org/10.5194/egusphere-2024-3093, https://doi.org/10.5194/egusphere-2024-3093, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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The pollutants over Northern India are transported towards South India under the influence of the prevalent wind system, especially during winter. This long-range transport induces a widespread haziness over southern India, lasting for days. We evaluated the occurrence of such transport episodes over south India using observational methods and found that it suppresses the boundary layer height by ~38 % compared to the clear days while exacerbating the surface pollution by ~30–35 %.
26 Nov 2024
Radiative and climate effects of aerosol scattering in long-wave radiation based on global climate modeling
Thomas Drugé, Pierre Nabat, Martine Michou, and Marc Mallet
EGUsphere, https://doi.org/10.5194/egusphere-2024-3659, https://doi.org/10.5194/egusphere-2024-3659, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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Aerosol scattering in long-wave radiation is often neglected in climate models. In this study, we analyze its impact through a physical modeling of this process in the CNRM ARPEGE-Climat model. It mainly leads to surface LW radiation increases across Sahara, Sahel and Arabian Peninsula, resulting in daily minimum near-surface temperature rises. Other changes in atmospheric fields are also simulated.
26 Nov 2024
Stratospheric Aerosol Intervention Experiment for the Chemistry-Climate Model Intercomparison Project
Simone Tilmes, Ewa M. Bednarz, Andrin Jörimann, Daniele Visioni, Douglas E. Kinnison, Gabriel Chiodo, and David Plummer
EGUsphere, https://doi.org/10.5194/egusphere-2024-3586, https://doi.org/10.5194/egusphere-2024-3586, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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This paper describes the details of a new multi-model intercomparison experiment to assess the effects of Stratospheric Aerosol Injections on stratospheric chemistry and dynamics and, therefore, ozone. In this experiment, all models will use the same prescribed stratospheric aerosol distribution and fixed sea-surface temperatures and sea ice. We discuss the advantages and differences of this more constrained experiment compared to previous more interactive model experiments.
26 Nov 2024
Spatially separate production of hydrogen oxides and nitric oxide in lightning
Jena M. Jenkins and William H. Brune
EGUsphere, https://doi.org/10.5194/egusphere-2024-3579, https://doi.org/10.5194/egusphere-2024-3579, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Both the atmosphere’s primary cleaner, the hydroxyl radical, and nitric oxide are generated in extreme amounts by lightning, and laboratory and modelling experiments demonstrate that these molecules are generated in different places in lightning flashes. Thus the hydroxyl radical is not immediately consumed by the nitric oxide and instead is available to remove other pollutants in the atmosphere. Additionally, substantial nitrous acid is also likely generated by lightning.
26 Nov 2024
Downward and upward revisions of Chinese emissions of black carbon and CO in bottom-up inventories are still required: an integrated analysis of WRF/CMAQ model and EMeRGe observations in East Asia in spring 2018
Phuc Thi Minh Ha, Yugo Kanaya, Kazuyo Yamaji, Syuichi Itahashi, Satoru Chatani, Takashi Sekiya, Maria Dolores Andrés Hernández, John Philip Burrows, Hans Schlager, Michael Lichtenstern, Mira Poehlker, and Bruna Holanda
EGUsphere, https://doi.org/10.5194/egusphere-2024-2064, https://doi.org/10.5194/egusphere-2024-2064, 2024
Preprint under review for ACP (discussion: open, 1 comment)
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Black carbon and CO are important to climate change. EMeRGe airborne observation can identify the suitability of emission inventories used in CMAQv5.0.2 model for Asian polluted regions. GFEDv4.1s is suitable for fire emissions. Anthropogenic BC and CO emissions from Philippines (REASv2.1) are insufficient. The estimated Chinese emissions in 2018 are 0.65±0.25 TgBC, 166±65 TgCO and 12.4±4.8 PgCO2, suggesting a reduction and increment for China's BC and CO emissions in the HTAPv2.2z inventory.
25 Nov 2024
Tracking daily NOx emissions from an urban agglomeration based on TROPOMI NO2 and a local ensemble transform Kalman filter
Yawen Kong, Bo Zheng, and Yuxi Liu
EGUsphere, https://doi.org/10.5194/egusphere-2024-2996, https://doi.org/10.5194/egusphere-2024-2996, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Current high-resolution satellite remote sensing technologies provide a unique opportunity to derive timely, high-resolution emission data. We developed an emission inversion system to assimilate satellite NO2 data to obtain daily, kilometer-scale NOx emission inventories. Our results enhance inventory accuracy, allowing us to capture the effects of pollution control policies on daily emissions (e.g., during COVID-19 lockdown) and improve fine-scale air quality modeling.
25 Nov 2024
Rapid Increases of Ozone Concentrations over Tibetan Plateau Caused by Local and Non-Local Factors
Chenghao Xu, Jintai Lin, Hao Kong, Junli Jin, Lulu Chen, and Xiaobin Xu
EGUsphere, https://doi.org/10.5194/egusphere-2024-3471, https://doi.org/10.5194/egusphere-2024-3471, 2024
Preprint under review for ACP (discussion: final response, 4 comments)
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We observed a strong increase in deseasonalized ozone at urban stations on the Tibetan Plateau from 2015 to 2019, far exceeding the trend at the baseline station Waliguan and the Tibet Plateau average trend of four tropospheric ozone products. By combining multiple datasets and modeling approaches, we identified the main contributing factors as more frequent transport passing through the lower layers of high-emission regions and the rapid increase in anthropogenic nitrogen oxide emissions.
25 Nov 2024
Significant influence of oxygenated volatile organic compounds on atmospheric chemistry analysis: A case study in a typical industrial city in China
Jingwen Dai, Kun Zhang, Yanli Feng, Xin Yi, Rui Li, Jin Xue, Qing Li, Lishu Shi, Jiaqiang Liao, Yanan Yi, Fangting Wang, Liumei Yang, Hui Chen, Ling Huang, Jiani Tan, Yangjun Wang, and Li Li
EGUsphere, https://doi.org/10.5194/egusphere-2024-3201, https://doi.org/10.5194/egusphere-2024-3201, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Oxygenated volatile organic compounds (OVOCs) are important ozone (O3) precursors. However, most of O3 formation analysis based on the box model (OBM) don't include OVOCs constraint To access the interference of OVOCs on O3 simulation, this study conducted field campaign and OBM analysis. The results indicates that no OVOCs constraint in the OBM can lead to overestimate of OVOCs, free radicals, and O3.
25 Nov 2024
First Reported Detection of a Winter Continental Gamma-Ray Glow in Europe
Jakub Šlegl, Zbyněk Sokol, Petr Pešice, Ronald Langer, Igor Strhárský, Jana Popová, Martin Kákona, Iva Ambrožová, and Ondřej Ploc
EGUsphere, https://doi.org/10.5194/egusphere-2024-3075, https://doi.org/10.5194/egusphere-2024-3075, 2024
Revised manuscript under review for ACP (discussion: final response, 5 comments)
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We observed the first-ever gamma-ray glow from a winter thunderstorm in Europe. Typically, these high-energy radiation events are linked to strong electric fields, but we found a surprisingly weak field at ground level. This suggests that the electric field higher up in the cloud plays a key role. Using advanced instruments, we gained new insights into how thunderstorms produce radiation, especially under rare winter conditions. This challenges existing theories.
25 Nov 2024
Technical note: Reconstructing surface missing aerosol elemental carbon data in long-term series with ensemble learning
Qingxiao Meng, Yunjiang Zhang, Sheng Zhong, Jie Fang, Lili Tang, Yongcai Rao, Minfeng Zhou, Jian Qiu, Xiaofeng Xu, Jean-Eudes Petit, Olivier Favez, and Xinlei Ge
EGUsphere, https://doi.org/10.5194/egusphere-2024-2776, https://doi.org/10.5194/egusphere-2024-2776, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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We developed a new method to reconstruct missing elemental carbon (EC) data in four Chinese cities from 2013 to 2023. Using machine learning, we accurately filled data gaps and introduced a new approach to analyze EC trends. Our findings reveal a significant decline in EC due to stricter pollution controls, though this slowed after 2020. This study provides a versatile framework for addressing data gaps and supports strategies to reduce urban air pollution and its climate impacts.
25 Nov 2024
Measurement report: size-resolved particle effective density measured by the AAC-SMPS and implications for chemical composition
Yao Song, Jing Wei, Wenlong Zhao, Jinmei Ding, Xiangyu Pei, Fei Zhang, Zhengning Xu, Ruifang Shi, Ya Wei, Lu Zhang, Lingling Jin, and Zhibin Wang
EGUsphere, https://doi.org/10.5194/egusphere-2024-3298, https://doi.org/10.5194/egusphere-2024-3298, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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This study investigates the size-resolved effective density (ρeff) of aerosol particles in Hangzhou using an AAC-SMPS. The ρeff values ranged from 1.47 to 1.63 g/cm3, increasing with particle diameter. Smaller particles showed significant diurnal density variations. The relationship between ρeff and particle diameter varies due to differences in the chemical composition of the particles. A new method to derive size-resolved chemical composition of particles from ρeff was proposed.
22 Nov 2024
The role of surface-active macromolecules in the ice nucleating ability of lignin, Snomax, and agricultural soil extracts
Kathleen A. Thompson, Paul Bieber, Anna J. Miller, Nicole Link, Benjamin J. Murray, and Nadine Borduas-Dedekind
EGUsphere, https://doi.org/10.5194/egusphere-2024-2827, https://doi.org/10.5194/egusphere-2024-2827, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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Lignin and Snomax are surface-active macromolecules that show a relationship between increasing concentrations, decreasing surface tension, and increasing ice-nucleating ability. However, this relationship did not hold for agricultural soil extracts collected in the UK and Canada. Hydrophobic interfaces play an important role in the ice-nucleating activity of organic matter; as the complexity of the sample increases, the hydrophobic interfaces in the bulk compete with the air-water interface.
21 Nov 2024
Sources and trends of Black Carbon Aerosol in a Megacity of Nanjing, East China After the China Clean Action Plan and Three-Year Action Plan
Abudurexiati Abulimiti, Yanlin Zhang, Mingyuan Yu, Yihang Hong, Yu-Chi Lin, Chaman Gul, and Fang Cao
EGUsphere, https://doi.org/10.5194/egusphere-2024-2503, https://doi.org/10.5194/egusphere-2024-2503, 2024
Revised manuscript accepted for ACP (discussion: final response, 5 comments)
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To improve air quality, the Chinese government implemented strict clean air actions. We explored how black carbon (BC) responded to these actions and found that the reduction in liquid fuel use was the main factor driving the decrease in BC levels. Additionally, meteorological factors also played a significant role in the long-term trends of BC. These factors should be considered in future emission reduction policies to further enhance air quality improvements.
21 Nov 2024
Evaluating spatiotemporal variations and exposure risk of ground-level ozone concentrations across China from 2000 to 2020 using satellite-derived high-resolution data
Qingqing He, Jingru Cao, Pablo E. Saide, Tong Ye, and Weihang Wang
EGUsphere, https://doi.org/10.5194/egusphere-2024-3310, https://doi.org/10.5194/egusphere-2024-3310, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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We explored variations in ground ozone and exposure risk hotspots across China (2000–2020) at multiple spatiotemporal scales using a high-resolution dataset derived from satellite LST via a machine-learning hindcast framework. The dataset was validated using cross-validation and external measurements. A non-monotonous trend emerged, with turning points around 2007 and 2015, showing regional variation. Ozone levels >100 μg/m3 shifted from June to May, while levels >160 μg/m3 expanded in the NCP.
21 Nov 2024
Variation in shortwave water vapour continuum and impact on clear-sky shortwave radiative feedback
Kaah P. Menang, Stefan A. Buehler, Lukas Kluft, Robin J. Hogan, and Florian E. Roemer
EGUsphere, https://doi.org/10.5194/egusphere-2024-3051, https://doi.org/10.5194/egusphere-2024-3051, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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We investigated how the uncertainty in representing water vapour continuum absorption in the shortwave affects clear-sky shortwave radiative feedback. For current surface temperature, the impact is modest (<2 %). In a warmer world, continuum induced error in estimated shortwave feedback is up to ~5 %. Using the MT_CKD model in radiative transfer calculations may lead to an underestimation of the shortwave feedback. Constraining shortwave continuum will contribute to reducing these discrepancies.
20 Nov 2024
Measurement Report: A survey of meteorological and cloud properties during ACTIVATE's postfrontal flights and their suitability for Lagrangian case studies
Florian Tornow, Ann Fridlind, George Tselioudis, Brian Cairns, Andrew Ackerman, Seethala Chellappan, David Painemal, Paquita Zuidema, Christiane Voigt, Simon Kirschler, and Armin Sorooshian
EGUsphere, https://doi.org/10.5194/egusphere-2024-3462, https://doi.org/10.5194/egusphere-2024-3462, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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The recent NASA campaign ACTIVATE (Aerosol Cloud meTeorology Interactions oVer the western ATlantic Experiment) performed 71 tandem flights in mid-latitude marine cold-air outbreaks off the US Eastern seaboard. We provide meteorological and cloud transition stage context, allowing us to identify days that are most suitable for Lagrangian modeling and analysis. Surveyed cloud properties show signatures of cloud microphysical processes, such as cloud-top entrainment and secondary ice formation.
20 Nov 2024
Cold pools mediate mesoscale adjustments of trade-cumulus fields to changes in cloud-droplet number concentration
Pouriya Alinaghi, Fredrik Jansson, Daniel A. Blázquez, and Franziska Glassmeier
EGUsphere, https://doi.org/10.5194/egusphere-2024-3501, https://doi.org/10.5194/egusphere-2024-3501, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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Shallow clouds in the trades are a major source of uncertainty in climate projections. These clouds organize into striking mesoscale patterns that are exactly what climate models lack. This study explores the origin of such patterns and investigates how variations in microscale properties control them. The importance of microscale effects is compared to that of large-scale forcing on the mesoscale organization of trade-cumulus fields.
20 Nov 2024
High-resolution air quality maps for Bucharest using Mixed-Effects Modeling Framework
Camelia Talianu, Jeni Vasilescu, Doina Nicolae, Alexandru Ilie, Andrei Dandocsi, Anca Nemuc, and Livio Belegante
EGUsphere, https://doi.org/10.5194/egusphere-2024-2930, https://doi.org/10.5194/egusphere-2024-2930, 2024
Revised manuscript accepted for ACP (discussion: final response, 7 comments)
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Bucharest, Romania's capital, has successfully used mobile measurements and mixed-effects LUR models to derive seasonal maps of near-surface PM10, NO2, and UFP. The data was collected during two intensive campaigns, covering high-traffic streets, residential, industrial, and commercial districts. The model's performance was evaluated, demonstrating its potential for high-resolution mapping in other cities with well-characterized urban structures and diverse in situ monitoring stations.
20 Nov 2024
Measurement Report: Influence of particle density on secondary ice production by graupel and ice pellet collisions
Sudha Yadav, Lilly Metten, Pierre Grzegorczyk, Alexander Theis, Subir Kumar Mitra, and Miklós Szakáll
EGUsphere, https://doi.org/10.5194/egusphere-2024-3222, https://doi.org/10.5194/egusphere-2024-3222, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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We conducted laboratory studies on the fragmentation of ice particles by collision. Graupels were created by riming at -7 and -15 °C simulating also rotation and tumbling. Ice pellets were generated by freezing water in 3D-printed spherical molds. The number of fragments generated by collision was between 1 and 20, and strongly dependent on the density of the graupel. We also showed that the number of fragments becomes zero when the particle suffers more than three collisions in a row.
20 Nov 2024
Investigating the link between mineral dust hematite content and intensive optical properties by means of lidar measurements and aerosol modelling
Sofía Gómez Maqueo Anaya, Dietrich Althausen, Julian Hofer, Moritz Haarig, Ulla Wandinger, Bernd Heinold, Ina Tegen, Matthias Faust, Holger Baars, Albert Ansmann, Ronny Engelmann, Annett Skupin, Birgit Heese, and Kerstin Schepanski
EGUsphere, https://doi.org/10.5194/egusphere-2024-3159, https://doi.org/10.5194/egusphere-2024-3159, 2024
Revised manuscript under review for ACP (discussion: final response, 6 comments)
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This study investigates how hematite (an iron oxide mineral) in the Saharan Desert dust affects how dust particles interact with radiation. Using lidar data from Cabo Verde (2021–2022) and hematite content from atmospheric model simulations, the results show that higher hematite fraction leads to stronger particle backscattering at specific wavelengths. These findings can improve the representaiton of mineral dust in climate models, particularly regarding their radiative effect.
18 Nov 2024
Dry and warm conditions in Australia exacerbated by aerosol reduction in China
Jiyuan Gao, Yang Yang, Hailong Wang, Pinya Wang, and Hong Liao
EGUsphere, https://doi.org/10.5194/egusphere-2024-3399, https://doi.org/10.5194/egusphere-2024-3399, 2024
Preprint under review for ACP (discussion: final response, 4 comments)
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The decline in aerosols in China altered temperature and pressure gradients between the two hemispheres, which intensified the Southern Trade Winds and caused a moisture divergence in Australia, resulting in less rainfall. Reduced surface moisture led to more energy being converted into sensible heat instead of evaporating as latent heat, which raised near-surface temperatures. Our findings offer insights for managing drought and wildfire risks in Australia.
18 Nov 2024
Understanding Boreal Summer UTLS Water Vapor Variations in Monsoon Regions: A Lagrangian Perspective
Hongyue Wang, Mijeong Park, Mengchu Tao, Cristina Peña-Ortiz, Nuria Pilar Plaza, Felix Ploeger, and Paul Konopka
EGUsphere, https://doi.org/10.5194/egusphere-2024-3260, https://doi.org/10.5194/egusphere-2024-3260, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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We investigated how stratospheric water vapor behaves over the Asian and North American monsoons. Using a method that tracks air movement, we recreated the moisture patterns. Our results show that the moisture in monsoon regions is primarily controlled by largescale air temperatures, while the North American monsoon is influenced by distant transport. These findings enhance our understanding of summertime stratospheric water vapor changes and offer insights into climate feedback mechanisms.
15 Nov 2024
Divergent changes in aerosol optical hygroscopicity and new particle formation induced by heatwaves
Yuhang Hao, Peizhao Li, Yafeng Gou, Zhenshuai Wang, Mi Tian, Yang Chen, Ye Kuang, Hanbing Xu, Fenglian Wan, Yuqian Luo, Wei Huang, and Jing Chen
EGUsphere, https://doi.org/10.5194/egusphere-2024-3242, https://doi.org/10.5194/egusphere-2024-3242, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Intensified heatwaves with the global warming have influenced new particle formation (NPF) and related aerosol physicochemical properties. We show that aerosol optical hygroscopicity (f(RH)) was generally higher on NPF event days than non-event cases, likely due to enhanced secondary formation and subsequent growth of both pre-existing and newly formed particles with stronger photooxidation specifically under persistent heatwaves. This would further impact the aerosol direct radiative forcing.
15 Nov 2024
Estimation of diurnal emissions of CO2 from thermal power plants using spaceborne IPDA lidar
Xuanye Zhang, Hailong Yang, Lingbing Bu, Zengchang Fan, Wei Xiao, Binglong Chen, Lu Zhang, Sihan Liu, Zhongting Wang, Jiqiao Liu, Weibiao Chen, and Xuhui Lee
EGUsphere, https://doi.org/10.5194/egusphere-2024-3152, https://doi.org/10.5194/egusphere-2024-3152, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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This study utilized the IPDA lidar aboard the DQ-1 satellite to monitor emissions from localized strong point sources and, for the first time, observed the diurnal variation of CO2 emissions from a high-latitude power plant, Overall, power plant CO2 emissions were largely consistent with local electricity consumption patterns, with most plants emitting less at night than during the day, and with higher emissions in winter and summer compared to spring and autumn.
15 Nov 2024
A Novel Method to Quantify the Uncertainty Contribution of Aerosol-Radiative Interaction Factors
Bishuo He and Chunsheng Zhao
EGUsphere, https://doi.org/10.5194/egusphere-2024-3441, https://doi.org/10.5194/egusphere-2024-3441, 2024
Revised manuscript under review for ACP (discussion: final response, 5 comments)
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Factor-uncertainty analysis helps us understand their impacts on complex systems. Traditional methods have many limitations. This study introduces a new method to measure how each factor contributes to uncertainty. It gains insights into the role of each variable and works for all multi-factor systems. As an application, we analyzed how aerosols affect solar radiation and identified the key factors. These analyses can improve our understanding of the role of aerosols in climate change.
14 Nov 2024
Enhanced emission of intermediate/semi-volatile organic matters in both gas and particle phases from ship exhausts with low-sulfur fuels
Binyu Xiao, Fan Zhang, Zeyu Liu, Yan Zhang, Rui Li, Can Wu, Xinyi Wan, Yi Wang, Yubao Chen, Yong Han, Min Cui, Libo Zhang, Yingjun Chen, and Gehui Wang
EGUsphere, https://doi.org/10.5194/egusphere-2024-3433, https://doi.org/10.5194/egusphere-2024-3433, 2024
Revised manuscript accepted for ACP (discussion: final response, 10 comments)
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Intermediate/semi-volatile organic compounds in both gas and particle phases from ship exhausts are enhanced due to the switch of fuels from low-sulfur to ultra-low-sulfur. The findings indicate that optimization is necessary for the forthcoming global implementation of an ultra-low-sulfur oil policy. Besides, we find that organic diagnostic markers of hopanes, in conjunction with the ratio of octadecanoic to tetradecanoic could be considered as potential tracers for HFO exhausts.
14 Nov 2024
Investigating the limiting aircraft design-dependent and environmental factors of persistent contrail formation
Liam Megill and Volker Grewe
EGUsphere, https://doi.org/10.5194/egusphere-2024-3398, https://doi.org/10.5194/egusphere-2024-3398, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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This study uses ERA5 data to better understand the relative importance of the factors limiting persistent contrail formation. We develop climatological relationships to estimate potential persistent contrail formation for existing as well as future aircraft and propulsion system designs. We identify latitudes and pressure levels where the introduction of novel aircraft designs would result in significant changes in potential persistent contrail formation compared to conventional aircraft.
14 Nov 2024
Data-driven modeling of environmental factors influencing Arctic methanesulfonic acid aerosol concentrations
Jakob Pernov, William Aeberhard, Michele Volpi, Eliza Harris, Benjamin Hohermuth, Sakiko Ishino, Ragnhild Bieltvedt Skeie, Stephan Henne, Ulas Im, Patricia Quinn, Lucia Upchurch, and Julia Schmale
EGUsphere, https://doi.org/10.5194/egusphere-2024-3379, https://doi.org/10.5194/egusphere-2024-3379, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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MSAp is a vital part of the Arctic climate system. Numerical models struggle to reproduce the seasonal cycle of MSAp. We evaluate three numerical models and one reanalysis product’s ability to simulate MSAp. We develop data-driven models for MSAp at four High Arctic stations. The data-driven models outperform the numerical models and reanalysis product and identified precursor source, chemical processing, and removal-related features as being important for modeling MSAp.
14 Nov 2024
Relationship between latent and radiative heating fields of Tropical cloud systems using synergistic satellite observations
Xiaoting Chen, Claudia J. Stubenrauch, and Giulio Mandorli
EGUsphere, https://doi.org/10.5194/egusphere-2024-3434, https://doi.org/10.5194/egusphere-2024-3434, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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Strongly precipitating mesoscale convective systems produce large diabatic heating of the atmosphere, influencing atmospheric circulation. Their complete 3D description, attained by machine learning techniques in combination with satellite observations, has enabled a detailed study of the relationship between latent and radiative heating in these cloud systems. Convective organization increases both the average and vertical gradient of radiative effects of the mesoscale convective systems.
14 Nov 2024
Soil Deposition of Atmospheric Hydrogen Constrained using Planetary Scale Observations
Alexander Karim Tardito Chaudhri and David S. Stevenson
EGUsphere, https://doi.org/10.5194/egusphere-2024-3247, https://doi.org/10.5194/egusphere-2024-3247, 2024
Revised manuscript under review for ACP (discussion: final response, 6 comments)
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There remains a large uncertainty in the global warming potential of atmospheric hydrogen due to poor constraints on its soil deposition, and therefore its lifetime. A new analysis of the latitudinal variation in the observed seasonality of hydrogen is used to constrain its surface fluxes. This is complemented with a simple latitude-height model where surface fluxes are adjusted from a prototype deposition scheme.
13 Nov 2024
Multi-year precipitation characteristics based on in-situ and remote sensing observations at Ny-Ålesund, Svalbard
Kerstin Ebell, Christian Buhren, Rosa Gierens, Giovanni Chellini, Melanie Lauer, Andreas Walbröl, Sandro Dahlke, Pavel Krobot, and Mario Mech
EGUsphere, https://doi.org/10.5194/egusphere-2024-3368, https://doi.org/10.5194/egusphere-2024-3368, 2024
Preprint under review for ACP (discussion: final response, 4 comments)
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Ground-based observations of precipitation are rare in the Arctic. In 2017, additional precipitation measurements by a precipitation gauge, a laser disdrometer, and a micro rain radar were established at the Arctic station AWIPEV in Ny-Ålesund, Svalbard. We present statistics on precipitation amount, frequency, and type for the first years of data. Large-scale systems like atmospheric rivers and cyclones strongly contribute to precipitation and, in particular, to extreme precipitation events.
12 Nov 2024
Impact of atmospheric turbulence on the accuracy of point source emission estimates using satellite imagery
Michał Gałkowski, Julia Marshall, Blanca Fuentes Andrade, and Christoph Gerbig
EGUsphere, https://doi.org/10.5194/egusphere-2024-2792, https://doi.org/10.5194/egusphere-2024-2792, 2024
Preprint under review for ACP (discussion: final response, 4 comments)
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Observations of GHG emissions are needed to monitor the progress towards Paris Agreement goals. Remote sensing instruments have been used to estimate emissions from the strongest anthropogenic sources. Here, we study the impact of atmospheric turbulence on the estimation of CO2 with a realistic atmospheric model, and we show that the formation of persistent plume structures causes uncertainty on the order of 10 % of total emission that cannot be avoided.
12 Nov 2024
Short lifetimes of organic nitrates in a sub-urban temperate forest indicate efficient assimilation of reactive nitrogen by the biosphere
Simone T. Andersen, Rolf Sander, Patrick Dewald, Laura Wüst, Tobias Seubert, Gunther N. T. E. Türk, Jan Schuladen, Max R. McGillen, Chaoyang Xue, Abdelwahid Mellouki, Alexandre Kukui, Vincent Michoud, Manuela Cirtog, Mathieu Cazaunau, Astrid Bauville, Hichem Bouzidi, Paola Formenti, Cyrielle Denjean, Jean-Claude Etienne, Olivier Garrouste, Christopher Cantrell, Jos Lelieveld, and John N. Crowley
EGUsphere, https://doi.org/10.5194/egusphere-2024-3437, https://doi.org/10.5194/egusphere-2024-3437, 2024
Revised manuscript accepted for ACP (discussion: final response, 9 comments)
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Measurements and modelling of reactive nitrogen gases observed in a suburban temperate forest in Rambouillet, France circa 50 km southwest of Paris in 2022 indicate that the biosphere rapidly scavenges organic nitrates of mixed biogenic and anthropogenic origin, resulting in short lifetimes for e.g. alkyl nitrates and peroxy nitrates.
11 Nov 2024
Ambient and Intrinsic Dependencies of Evolving Ice-Phase Particles within a Decaying Winter Storm During IMPACTS
Andrew DeLaFrance, Lynn McMurdie, Angela Rowe, and Andrew Heymsfield
EGUsphere, https://doi.org/10.5194/egusphere-2024-3423, https://doi.org/10.5194/egusphere-2024-3423, 2024
Revised manuscript under review for ACP (discussion: final response, 6 comments)
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Numerical modeling simulations are used to investigate ice crystal growth and decay processes within a banded region of enhanced precipitation rates during a prominent winter storm. We identify robust primary ice growth in the upper portion of the cloud but decay exceeding 70 % during fallout through a subsaturated layer. The ice fall characteristics and decay rate are sensitive to the ambient cloud properties which has implications for radar-based measurements and precipitation accumulations.
11 Nov 2024
Measurement report: Insight into Greenhouse Gas Emission Characteristics of Light-Duty Vehicles in China Driven by Technological Innovation
Xinping Yang, Jia Ke, Zhihui Huang, Yi Wen, Dailin Yin, Zhen Jiang, Zhigang Yue, Yunjing Wang, Songdi Liao, Hang Yin, and Yan Ding
EGUsphere, https://doi.org/10.5194/egusphere-2024-3095, https://doi.org/10.5194/egusphere-2024-3095, 2024
Preprint under review for ACP (discussion: open, 2 comments)
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Given the limitation of insufficient research on greenhouse gas emission characteristics of light-duty vehicles in China against the dual-carbon background, we conducted chassis dynamometer tests on over ten vehicles and elaborated in detail on the characteristics of greenhouse gas emissions from vehicles driven by technological updates.
11 Nov 2024
Monoterpene oxidation pathways initiated by acyl peroxy radical addition
Dominika Pasik, Thomas Golin Almeida, Emelda Ahongshangbam, Siddharth Iyer, and Nanna Myllys
EGUsphere, https://doi.org/10.5194/egusphere-2024-3464, https://doi.org/10.5194/egusphere-2024-3464, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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We used quantum chemistry methods to investigate the oxidation mechanisms of acyl peroxy radicals (APRs) with various monoterpenes. Our findings reveal unique oxidation pathways for different monoterpenes, leading to either chain-terminating products or highly reactive intermediates that can contribute to particle formation in the atmosphere. This research highlights APRs as potentially significant but underexplored atmospheric oxidants, which may influence future approaches to modeling climate.
11 Nov 2024
Snow Particle Fragmentation Enhances Snow Sublimation
Ning Huang, Jiacheng Bao, Hongxiang Yu, and Guang Li
EGUsphere, https://doi.org/10.5194/egusphere-2024-3218, https://doi.org/10.5194/egusphere-2024-3218, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Particle fragmentation makes snowflakes spherical during wind-drifting snow. However, no drifting snow model has presented this process so far. We established a drifting snow model considering particle fragmentation and investigated the effects of snow particle fragmentation on drifting and blowing snow. Our results show that fragmentation intensifies the sublimation of blowing snow and changes the airborne particle size distribution, which should not be ignored in current blowing snow models.
11 Nov 2024
Advances in characterization of black carbon particles and their associated coatings using the soot particle aerosol mass spectrometer in Singapore, a complex city environment
Mutian Ma, Laura-Hélèna Rivellini, Yichen Zong, Markus Kraft, Liya E. Yu, and Alex King Yin Lee
EGUsphere, https://doi.org/10.5194/egusphere-2024-3240, https://doi.org/10.5194/egusphere-2024-3240, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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This work advances our understanding of emission and atmospheric evolution of black carbon (BC) particles in Singapore, a complex urban environment impacted by multiple local and regional combustion sources, based on the improved source apportionment analysis of real-time aerosol mass spectrometry measurement.
11 Nov 2024
Physical-chemical properties of particles in hailstones from Central Argentina
Anthony C. Bernal Ayala, Angela K. Rowe, Lucia E. Arena, and William O. Nachlas
EGUsphere, https://doi.org/10.5194/egusphere-2024-3215, https://doi.org/10.5194/egusphere-2024-3215, 2024
Revised manuscript under review for ACP (discussion: final response, 3 comments)
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This study analyzed particles in hailstones from Argentina to better understand hail formation and growth. A unique method was used that revealed the particles’ size, composition, and location within the hail, including a variety of particle sizes and compositions linked to local land uses, such as mountainous, agricultural, and urban. The findings highlight the potential impacts of natural and human-related factors on hail formation and provide a new method for studying hail globally.
08 Nov 2024
HOMs and SOA formation from the oxidation of α- and β-phellandrenes by NO3 radicals
Sergio Harb, Manuela Cirtog, Stéphanie Alage, Christopher Cantrell, Mathieu Cazaunau, Vincent Michoud, Edouard Pangui, Antonin Bergé, Chiara Giorio, Francesco Battaglia, and Bénédicte Picquet-Varrault
EGUsphere, https://doi.org/10.5194/egusphere-2024-3419, https://doi.org/10.5194/egusphere-2024-3419, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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We investigated the reactions of α- and β-phellandrenes (from vegetation emissions) with NO3 radicals, a major nighttime oxidant from human activities. Using lab-based simulations, we examined these reactions and measured particle formation and by-products. Our findings reveal that α- and β-phellandrenes are efficient particle sources and enhance our understanding of biogenic-anthropogenic interactions and their contributions to atmospheric changes affecting climate and health.
07 Nov 2024
Significant spatial and temporal variation of the concentrations and chemical composition of ultrafine particulate matter over Europe
Konstantinos Mataras, Evangelia Siouti, David Patoulias, and Spyros Pandis
EGUsphere, https://doi.org/10.5194/egusphere-2024-3357, https://doi.org/10.5194/egusphere-2024-3357, 2024
Preprint under review for ACP (discussion: open, 1 comment)
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Predicted levels of ultrafine particle mass (PM0.1) vary substantially over Europe with higher values in the summer than in the winter. In summer, PM0.1 was mostly comprised of sulfate (38 %) and secondary organics (32 %). During winter the sulfate fraction increased to 47 % and primary organics contributed 23 %. Correlations between PM0.1 and the regulated PM2.5 were low. This suggests that there are significant differences between the dominant sources and processes of PM0.1 and PM2.5.
07 Nov 2024
Multi-year black carbon observations and modeling close to the largest gas flaring and wildfire regions (Western Siberian Arctic)
Olga B. Popovicheva, Marina A. Chichaeva, Nikolaos Evangeliou, Sabine Eckhardt, Evangelia Diapouli, and Nikolay S. Kasimov
EGUsphere, https://doi.org/10.5194/egusphere-2024-3124, https://doi.org/10.5194/egusphere-2024-3124, 2024
Revised manuscript under review for ACP (discussion: final response, 5 comments)
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High-quality measurements of light-absorbing carbon were performed at the polar aerosol station "Island Bely” (Western Siberian Arctic) from 2019 to 2022. The maximum light absorption coefficients were seen in summer due to gas flaring contribution, which is the most significant source in the region. However, the increasing Siberian wildfires had a special share in carbon contribution to this high Arctic station with a persistent smoke layer extending over the whole troposphere in summer.
05 Nov 2024
Seasonal trends in the wintertime photochemical regime of the Uinta Basin, Utah, USA
Marc L. Mansfield and Seth N. Lyman
EGUsphere, https://doi.org/10.5194/egusphere-2024-3114, https://doi.org/10.5194/egusphere-2024-3114, 2024
Preprint under review for ACP (discussion: final response, 6 comments)
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Precursor compounds must be present in the lower atmosphere for ozone to form. Ozone abatement strategies focus on reducing such precursors, but measuring and modeling are necessary to determine the most efficient way to do this. We show that the sensitivity of ozone to various precursors changes over the course of the winter. We also argue that similar seasonal changes probably occur in many regions of the Northern Hemisphere.
05 Nov 2024
Six years of greenhouse gas fluxes at Saclay, France, estimated with the Radon Tracer Method
Camille Yver-Kwok, Michel Ramonet, Léonard Rivier, Jinghui Lian, Claudia Grossi, Roger Curcoll, Dafina Kikaj, Edward Chung, and Ute Karstens
EGUsphere, https://doi.org/10.5194/egusphere-2024-3107, https://doi.org/10.5194/egusphere-2024-3107, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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Here, we use greenhouse gas and radon data from a tall tower in France to estimate their fluxes within the station footprint from January 2017 to December 2022 using the Radon Tracer Method. Using the latest radon exhalation maps and standardized radon measurements, we found the greenhouse gas fluxes to be in agreement with the literature. Compared to inventories, there is a general agreement except for carbon dioxide where we show that the biogenic fluxes are not well represented in the model.
05 Nov 2024
Measurement report: Crustal materials play an increasing role in elevating particle pH: Insights from 12-year records in a typical inland city of China
Hongyu Zhang, Shenbo Wang, Zhangsen Dong, Xiao Li, and Ruiqin Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2024-2869, https://doi.org/10.5194/egusphere-2024-2869, 2024
Preprint under review for ACP (discussion: final response, 6 comments)
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To address this, 12-year observational data in Zhengzhou were investigated and revealed that the resuspension of surrounding soil dust determined the rebound of crustal material concentrations after 2019, further elevating the particle pH. Therefore, the future ammonia reduction policies in North China may not lead to a rapid increase in particle acidity buffering by the crustal materials, but it is necessary to consider synergistic control with dust sources.
05 Nov 2024
Representing improved tropospheric ozone distribution by including lightning NOx emissions in CHIMERE
Sanhita Ghosh, Arineh Cholakian, Sylvain Mailler, and Laurent Menut
EGUsphere, https://doi.org/10.5194/egusphere-2024-3087, https://doi.org/10.5194/egusphere-2024-3087, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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In the study, we estimate the emissions of nitrogen oxides from lightning (LNOx) over the northern hemisphere and study its impact on tropospheric ozone (O3). We evaluate the present state of modelling the lightning, using a classical parametrization scheme and the model CHIMERE. The comparison of the simulated O3 to measurements shows that the inclusion of LNOx emissions remarkably improves the tropospheric O3 distribution, reducing the bias significantly, particularly in the free troposphere.
05 Nov 2024
Highly-resolved satellite remote sensing based land-use change inventory yields weaker surface albedo-induced global cooling
Xiaohu Jian, Xiaodong Zhang, Xinrui Liu, Kaijie Chen, Tao Huang, Shu Tao, Junfeng Liu, Hong Gao, Yuan Zhao, Ruiyu Zhugu, and Jianmin Ma
EGUsphere, https://doi.org/10.5194/egusphere-2024-1497, https://doi.org/10.5194/egusphere-2024-1497, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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We implemented a new global land use change (LUC) dataset on a 5 km×5 km resolution from 1982 to 2010 into a compact earth system model OSCAR and carried out extensive multiple model scenario simulations. Our result reveals that the global radiative forcing (RF) induced by LUC driving surface albedo change is -0.12 W m-2, 20 % lower than IPCC, and vegetation changes play a key role in RF evolution, which provides an important references for the assessment of earth energy balance.
05 Nov 2024
Sensitivity experiments with ICON-LAM to test probable explanations for higher ice crystal number over Arctic sea ice vs. ocean
Iris Papakonstantinou-Presvelou and Johannes Quaas
EGUsphere, https://doi.org/10.5194/egusphere-2024-3293, https://doi.org/10.5194/egusphere-2024-3293, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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As the Arctic warms and the sea ice retreats, more open ocean is exposed, changing how aerosols impact clouds. Our previous 10-year satellite analysis found higher ice crystal numbers over sea ice than over ocean. Using model simulations and aircraft observations we identify here two factors as potential causes at colder temperatures; ice nucleating particles over sea ice and blowing snow. With further sea ice loss, these processes may weaken, leading to fewer ice particles in the future.
04 Nov 2024
Light scattering and microphysical properties of atmospheric bullet rosette ice crystals
Shawn Wendell Wagner, Martin Schnaiter, Guanglang Xu, Franziska Nehlert, and Emma Järvinen
EGUsphere, https://doi.org/10.5194/egusphere-2024-3316, https://doi.org/10.5194/egusphere-2024-3316, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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Understanding the interaction between cirrus clouds and solar radiation is critical for modeling the Earth’s climate. A common crystal type found in cirrus clouds is the bullet rosette. Here, atmospheric bullet rosettes measured from jet aircraft are analyzed for their morphological and radiative properties. Atmospheric bullet rosettes are found to be more morphologically complex than previously assumed. This complexity has a significant impact on their radiative properties.
04 Nov 2024
Uncertainties in the effects of organic aerosol coatings on polycyclic aromatic hydrocarbon concentrations and their estimated health effects
Sijia Lou, Manish Shrivastava, Alexandre Albinet, Sophie Tomaz, Deepchandra Srivastava, Olivier Favez, Huizhong Shen, and Aijun Ding
EGUsphere, https://doi.org/10.5194/egusphere-2024-3269, https://doi.org/10.5194/egusphere-2024-3269, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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PAHs, emitted from incomplete combustion, pose serious health risks due to their carcinogenic properties. This research demonstrates that viscous organic aerosol coatings significantly hinder PAH oxidation, with spatial distributions sensitive to the degradation modelling approach. Our findings underscore the importance of accurately modelling these processes for risk assessments, highlighting the need to consider both fresh and oxidized PAHs in evaluating human exposure and health risks.
04 Nov 2024
Adjustments to an abrupt solar forcing in the CMIP6 abrupt-solm4p experiment
Charlotte Lange and Johannes Quaas
EGUsphere, https://doi.org/10.5194/egusphere-2024-3229, https://doi.org/10.5194/egusphere-2024-3229, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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We studied how the Earth’s climate system adjusts to sudden changes in the energy budget, by analyzing data of four climate models, which simulated a 4 % reduction of incoming solar energy. We found rapid cooling of the atmosphere and shifts in cloud cover and atmospheric circulation patterns like land-sea-circulation. Our research helps to better understand cloud adjustments, which are a main source of uncertainty in climate models. This can improve future climate predictions.
04 Nov 2024
Sensitivity of climate effects of hydrogen to leakage size, location, and chemical background
Ragnhild Bieltvedt Skeie, Marit Sandstad, Srinath Krishnan, Gunnar Myhre, and Maria Sand
EGUsphere, https://doi.org/10.5194/egusphere-2024-3079, https://doi.org/10.5194/egusphere-2024-3079, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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Hydrogen leakages can alter the amount of climate gases in the atmosphere and hence have a climate impact. In this study we investigate, using an atmospheric chemistry model, how this indirect climate effect differs for different amounts of leakages, where the hydrogen leaks and if this effect changes in the future. The effect is largest for emissions far from areas where hydrogen is removed from the atmosphere by the soil, but these are not relevant locations for a future hydrogen economy.
04 Nov 2024
Monitoring of total and off-road NOx emissions from Canadian oil sands surface mining using the Ozone Monitoring Instrument
Chris McLinden, Debora Griffin, Vitali Fioletov, Junhua Zhang, Enrico Dammers, Cristen Adams, Mallory Loria, Nicolay Krotkov, and Lok Lamsal
EGUsphere, https://doi.org/10.5194/egusphere-2024-2856, https://doi.org/10.5194/egusphere-2024-2856, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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The Ozone Monitoring Instrument (OMI) was used to understand the evolution of NOx emissions from the Canadian oil sands. OMI NO2 combined with winds and reported stack emissions, found emissions from the heavy-hauler mine fleet increased by about 20 % since 2005, whereas the total oil sands mined nearly doubled. This difference is a result of emissions standards limiting NOx emissions becoming more stringent over this period confirming the efficacy of the policy enacting these standards.
30 Oct 2024
Quantified ice-nucleating ability of AgI-containing seeding particles in natural clouds
Anna J. Miller, Christopher Fuchs, Fabiola Ramelli, Huiying Zhang, Nadja Omanovic, Robert Spirig, Claudia Marcolli, Zamin A. Kanji, Ulrike Lohmann, and Jan Henneberger
EGUsphere, https://doi.org/10.5194/egusphere-2024-3230, https://doi.org/10.5194/egusphere-2024-3230, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
Short summary
Executive editor
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We analyzed the ability of silver iodide particles to form ice crystals in naturally-occurring liquid clouds below 0 °C and found that ≈0.1−1 % of particles nucleate ice, with a negative dependence on temperature. Contextualizing our results with previous laboratory studies, we help to bridge the gap between laboratory and field experiments and which also helps to inform future cloud seeding projects.
Executive editor
The paper presents the first quantification of the freezing behaviour of siver iodide (AgI) containg seed particles derived from glaciogenic cloud seeding experiments in the real atmosphere. The study uses a unique approach by releasing the seeding particles from an unmanned airborne vehicle in supercooled low stratus clouds and measuring the formed ice crystals by a tethered balloon placed downwind. Based on their unique observation data the authors propose a novel freezing mechanism based on the hygroscopic growth of the particles in to solution droplets, subsequent freezing of droplets and further growth of ice crystals while ruling out competing freezing mechanisms like contact freezing.
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30 Oct 2024
The impact of organic nitrates on summer ozone formation in Shanghai, China
Chunmeng Li, Xiaorui Chen, Haichao Wang, Tianyu Zhai, Xuefei Ma, Xinping Yang, Shiyi Chen, Min Zhou, Shengrong Lou, Xin Li, Limin Zeng, and Keding Lu
EGUsphere, https://doi.org/10.5194/egusphere-2024-3337, https://doi.org/10.5194/egusphere-2024-3337, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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This study reports an observation of organic nitrate (including total peroxy nitrates and total alkyl nitrates) in Shanghai, China during the summer of 2021, by a homemade thermal dissociation cavity-enhanced absorption spectrometer (TD-CEAS, Atmos. Meas. Tech., 14, 4033–4051, 2021). The distribution of organic nitrates and their effects on local ozone production are analyzed based on the field observation in conjunction with model simulation.
30 Oct 2024
Exploring Atmospheric Nitrate Formation Mechanisms during the Winters of 2013 and 2018 in the North China Region via Modeling and Isotopic Analysis
Zhenze Liu, Jianhua Qi, Yuanzhe Ni, Likun Xue, and Xiaohuan Liu
EGUsphere, https://doi.org/10.5194/egusphere-2024-3044, https://doi.org/10.5194/egusphere-2024-3044, 2024
Revised manuscript under review for ACP (discussion: final response, 5 comments)
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Our study explores the formation of nitrate in the atmosphere of inland and coastal cities in China during the winters of 2013 & 2018. Through air quality modelling & isotope analysis, we found regional differences between these cities; coastal cities show another contribution from the heterogeneous reaction of dinitrogen pentoxide (N2O5). It turns out that the combined reduction of nitrogen oxides (NOx), volatile organic compounds (VOCs) and ammonia (NH3) is critical to reducing nitrate levels.
30 Oct 2024
African dust transported to Barbados in the Wintertime Lacks Indicators of Chemical Aging
Haley M. Royer, Michael T. Sheridan, Hope E. Elliott, Nurun Nahar Lata, Zezhen Cheng, Swarup China, Zihua Zhu, Andrew P. Ault, and Cassandra J. Gaston
EGUsphere, https://doi.org/10.5194/egusphere-2024-3288, https://doi.org/10.5194/egusphere-2024-3288, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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Saharan dust transported across the Atlantic to the Caribbean, South America, and North America is hypothesized to undergo chemical processing by inorganic and organic acids that enhances cloud droplet formation, nutrient availability, and reflectivity of. In this study, chemical analysis performed on African dust deposited over Barbados shows that acid tracers are found mostly on sea salt and smoke particles, rather than dust, indicating that dust particles undergo minimal chemical processing.
29 Oct 2024
Identification and Quantification of CH4 Emissions from Madrid Landfills using Airborne Imaging Spectrometry and Greenhouse Gas Lidar
Sven Krautwurst, Christian Fruck, Sebastian Wolff, Jakob Borchardt, Oke Huhs, Konstantin Gerilowski, Michał Gałkowski, Christoph Kiemle, Mathieu Quatrevalet, Martin Wirth, Christian Mallaun, John P. Burrows, Christoph Gerbig, Andreas Fix, Hartmut Bösch, and Heinrich Bovensmann
EGUsphere, https://doi.org/10.5194/egusphere-2024-3182, https://doi.org/10.5194/egusphere-2024-3182, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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Anomalously high CH4 emissions from landfills in Madrid, Spain, have been observed by satellite measurements in recent years. Our investigations of these waste facilities using passive and active airborne remote sensing measurements confirm these high emission rates with values of up to 13 th-1 during the overflight and show excellent agreement between the two techniques. A large fraction of the emissions is attributed to active landfill sites.
29 Oct 2024
Hydrogen Peroxide Photoformation in Particulate Matter and its Contribution to S(IV) Oxidation During Winter in Fairbanks, Alaska
Michael Oluwatoyin Sunday, Laura Marie Dahler Heinlein, Junwei He, Allison Moon, Sukriti Kapur, Ting Fang, Kasey C. Edwards, Fangzhou Guo, Jack Dibb, James H. Flynn III, Becky Alexander, Manabu Shiraiwa, and Cort Anastasio
EGUsphere, https://doi.org/10.5194/egusphere-2024-3272, https://doi.org/10.5194/egusphere-2024-3272, 2024
Revised manuscript accepted for ACP (discussion: final response, 5 comments)
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Hydrogen peroxide (HOOH) is an important oxidant that forms atmospheric sulfate. We demonstrate that illumination of brown carbon can rapidly form HOOH within particles, even under the low sunlight conditions of Fairbanks, Alaska during winter. This in-particle formation of HOOH is fast enough that it forms sulfate at significant rates. In contrast, the formation of HOOH in the gas phase during the campaign is expected to be negligible because of high NOx levels.
29 Oct 2024
Counteracting Influences of Gravitational Settling Modulate Aerosol Impacts on Cloud Base Lowering Fog Characteristics
Nathan H. Pope and Adele L. Igel
EGUsphere, https://doi.org/10.5194/egusphere-2024-3214, https://doi.org/10.5194/egusphere-2024-3214, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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We used PAFOG, an atmospheric model that simulates a single column, to study the sensitivity of marine fog formed through the lowering of the base of a stratus cloud to meteorology and aerosols. We found that higher aerosol concentration reduces the likelihood and duration of fog, but leads to denser fog. This overall trend was caused by multiple physical mechanisms depending on conditions.
29 Oct 2024
A WRF-Chem study of the greenhouse gas column and in situ surface concentrations observed at Xianghe, China. Part 1: Methane (CH4)
Sieglinde Callewaert, Minqiang Zhou, Bavo Langerock, Pucai Wang, Ting Wang, Emmanuel Mahieu, and Martine De Mazière
EGUsphere, https://doi.org/10.5194/egusphere-2024-3228, https://doi.org/10.5194/egusphere-2024-3228, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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We used an atmospheric transport model and satellite data to study CH4 observations at Xianghe, China. Our study shows the key source sectors that influence the concentrations and their respective importance. Furthermore, meteorological factors such as wind direction are discussed. This research highlights the challenges in accurately simulating these kind of measurements and helps us to better understand CH4 variability in the region.
29 Oct 2024
Validation and uncertainty quantification of three state-of-the-art ammonia surface exchange schemes using NH3 flux measurements in a dune ecosystem
Tycho Jongenelen, Margreet C. van Zanten, Enrico Dammers, Roy Wichink Kruit, Arjan Hensen, Leon F. G. Geers, and Jan Willem Erisman
EGUsphere, https://doi.org/10.5194/egusphere-2024-2881, https://doi.org/10.5194/egusphere-2024-2881, 2024
Revised manuscript accepted for ACP (discussion: final response, 5 comments)
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This article compares three ammonia (NH3) deposition models at a dune ecosystem and investigates the uncertainty of these models. The Zhang model aligned best with the measurements, whereas the DEPAC and Massad models overestimated and underestimated the NH3 deposition, respectively. The study found that NH3 exchange with wet plant leaves was an important but uncertain process, and offers recommendations to improve future models and suggest measurements to lower the existing uncertainty.
28 Oct 2024
Numerical Case Study of the Aerosol-Cloud-Interactions in Warm Boundary Layer Clouds over the Eastern North Atlantic with an Interactive Chemistry Module
Hsiang-He Lee, Xue Zheng, Shaoyue Qiu, and Yuan Wang
EGUsphere, https://doi.org/10.5194/egusphere-2024-3199, https://doi.org/10.5194/egusphere-2024-3199, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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The study investigates how aerosol-cloud interactions affect warm boundary layer stratiform clouds over the Eastern North Atlantic. High-resolution WRF-Chem simulations reveal that non-rain clouds at the edges of cloud systems are prone to evaporation, leading to an aerosol drying effect and a transition of aerosols back to accumulation mode for future activation. The study emphasizes that this dynamic behavior is often not adequately represented in most previous prescribed-aerosol simulations.
28 Oct 2024
Effects of sudden stratospheric warmings on the global ionospheric total electron content using a machine learning analysis
Guanyi Ma and Klemens Hocke
EGUsphere, https://doi.org/10.5194/egusphere-2024-3177, https://doi.org/10.5194/egusphere-2024-3177, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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We analyze the influences of sudden stratospheric warming (SSW) on diurnal/semidiurnal variations of ionosphere with the global total electron content (TEC) from 1998 to 2022. We use machine learning (ML) to establish the TEC (ML-TEC) model related to the solar/geomagnetic activities and seasonal change from the TEC data. Subtracting the ML-TEC from the observed TEC, we find a globally SSW-induced enhancement in diurnal/semidiurnal TEC variations.
28 Oct 2024
Building a comprehensive library of observed Lagrangian trajectories for testing modeled cloud evolution, aerosol-cloud interactions, and marine cloud brightening
Ehsan Erfani, Robert Wood, Peter Blossey, Sarah J. Doherty, and Ryan Eastman
EGUsphere, https://doi.org/10.5194/egusphere-2024-3232, https://doi.org/10.5194/egusphere-2024-3232, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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In this study, we explore how marine clouds interact with aerosols. We introduce a novel approach to identify a reduced number of representative cases from a wide array of observed environmental conditions prevalent in the Northeast Pacific. We created over 2200 trajectories from observations and used cloud-resolving simulations to investigate how marine low clouds evolve in two different cases. It is shown that aerosols can delay cloud breakup, but their impact depends on precipitation.
28 Oct 2024
The spatiotemporal evolution of atmospheric boundary layers over a thermally heterogeneous landscape
Mary Rose Mangan, Jordi Vilà-Guerau de Arellano, Bart J. H. van Stratum, Marie Lothon, Guylaine Canut-Rocafort, and Oscar K. Hartogensis
EGUsphere, https://doi.org/10.5194/egusphere-2024-3000, https://doi.org/10.5194/egusphere-2024-3000, 2024
Revised manuscript under review for ACP (discussion: final response, 5 comments)
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Using observations and high-resolution turbulence modeling, we examine the influence of irrigation-driven surface heterogeneity on the atmospheric boundary layer (ABL). We employ different spatial scales of heterogeneity to explore how the influence of surface heterogeneity on the ABL within a single grid cell would change in higher resolution global models. We find that the height of the ABL is highly variable, and that the surface heterogeneity is felt least strongly in the middle of the ABL.
28 Oct 2024
Gas-phase Observations of Accretion Products from Stabilized Criegee Intermediates in Terpene Ozonolysis with Two Dicarboxylic Acids
Yuanyuan Luo, Lauri Franzon, Jiangyi Zhang, Nina Sarnela, Neil M. Donahue, Theo Kurtén, and Mikael Ehn
EGUsphere, https://doi.org/10.5194/egusphere-2024-3323, https://doi.org/10.5194/egusphere-2024-3323, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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This study explores the formation of accretion products from reactions involving highly reactive compounds, Criegee intermediates. We focused on three types of terpenes, common in nature, and their reactions with specific acids. Our findings reveal that these reactions efficiently produce expected compounds. This research enhances our understanding of how these reactions affect air quality and climate by contributing to aerosol formation, crucial for atmospheric chemistry.
25 Oct 2024
A Better Understanding of an Extremely High Ozone Episode with Ensemble Simulation
Jinhui Gao and Hui Xiao
EGUsphere, https://doi.org/10.5194/egusphere-2024-3070, https://doi.org/10.5194/egusphere-2024-3070, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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The ensemble simulation provides a solution to better reproduce and understand the extremely high ozone episode occurred in the GBA when Typhoon NIDA approached South China in summer 2016. Elevated temperatures and weak winds contributed to the increase in ozone precursors, resulting in enhanced ozone production. Large amounts of ozone aloft also contributed to the increase in surface ozone via vertical transport. Notably, ozone from Southeast Asia contributed through this mechanism.
25 Oct 2024
Measurement report: Greenhouse gas profiles and age of air from the 2021 HEMERA-TWIN balloon launch
Tanja J. Schuck, Johannes Degen, Timo Keber, Katharina Meixner, Thomas Wagenhäuser, Mélanie Ghysels, Georges Durry, Nadir Amarouche, Alessandro Zanchetta, Steven van Heuven, Huilin Chen, Johannes C. Laube, Sophie Baartman, Carina van der Veen, Maria Elena Popa, and Andreas Engel
EGUsphere, https://doi.org/10.5194/egusphere-2024-3279, https://doi.org/10.5194/egusphere-2024-3279, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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A balloon was launched in 2021 in the Arctic to carry instruments for trace gase measurements up to 32 km. One purpose was to compare measurement techniques. We focus on the major greenhouse gases. To measure these, air was sampled with the AirCore technique and with flask sampling and analysed after the flight. In flight, observations were done with an optical method. In a companion paper we report on observations of chlorine and bromine containing trace gases.
25 Oct 2024
Influence of atmospheric waves and deep convection on water vapour in the equatorial lower stratosphere seen from long-duration balloon measurements
Sullivan Carbone, Emmanuel D. Riviere, Mélanie Ghysels, Jérémie Burgalat, Georges Durry, Nadir Amarouche, Aurélien Podglajen, and Albert Hertzog
EGUsphere, https://doi.org/10.5194/egusphere-2024-3249, https://doi.org/10.5194/egusphere-2024-3249, 2024
Preprint under review for ACP (discussion: final response, 4 comments)
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During the two first Strateole 2 campaigns, instruments have flown under super pressure balloons between 18 and 20 km for several weeks at the equator and performed in situ measurements of water vapor. The present article exposes the methodology used to quantify the modulation of water vapor by atmospheric waves and deep convective cases. This methodology allows to put to the fore the influence of atmospheric waves and extremely deep convection on the observed water vapor anomalies.
24 Oct 2024
Monitoring and modeling seasonally varying anthropogenic and biogenic CO2 over a large tropical metropolitan area
Rafaela Cruz Alves Alberti, Thomas Lauvaux, Angel Liduvino Vara-Vela, Ricard Segura Barrero, Christoffer Karoff, Maria de Fátima Andrade, Márcia Talita Amorim Marques, Noelia Rojas Benavente, Osvaldo Machado Rodrigues Cabral, Humberto Ribeiro da Rocha, and Rita Yuri Ynoue
EGUsphere, https://doi.org/10.5194/egusphere-2024-3060, https://doi.org/10.5194/egusphere-2024-3060, 2024
Preprint under review for ACP (discussion: final response, 4 comments)
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This study addresses uncertainties in atmospheric models by analyzing CO2 dynamics in a complex urban environment characterized by a dense population and tropical vegetation. High-accuracy sensors were deployed, and the WRF-GHG model was utilized to simulate CO2 transport, capturing variations and assessing contributions from both anthropogenic and biogenic sources.
24 Oct 2024
Local and transboundary contributions to nitrogen loadings across East Asia using CMAQ-ISAM and GEMS-informed emissions inventory during the winter-spring transition
Jincheol Park, Yunsoo Choi, and Sagun Kayastha
EGUsphere, https://doi.org/10.5194/egusphere-2024-3312, https://doi.org/10.5194/egusphere-2024-3312, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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We investigated NOx emissions’ contributions to nitrogen loadings across five regions of East Asia during the 2022 winter-spring transition through chemical transport modeling informed by satellite data. As seasons progress, local contributions within each region to its NOy budget decreased from 32 %–43 % to 23 %–30 %, while transboundary contributions increased from 16 %–33 % to 27 %–37 %, driven by a shift in synoptic settings that allowed pollutants to spread more broadly across the regions.
24 Oct 2024
The evolution of aerosols mixing state derived from a field campaign in Beijing: implications to the particles aging time scale in urban atmosphere
Jieyao Liu, Fang Zhang, Jingye Ren, and Lu Chen
EGUsphere, https://doi.org/10.5194/egusphere-2024-2999, https://doi.org/10.5194/egusphere-2024-2999, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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The particles mixing states and aging time scale are important for the evaluation of aerosols climate effects, but they are poorly parameterized in current models. We unravel the evolution of real-time mixing states and aging time scale of size-resolved particles based on field measurement in urban Beijing. This study provides observational basis for accurately parameterizing the aging time scale of aerosol particles in climate models.
23 Oct 2024
Strong inter-model differences and biases in CMIP6 simulations of PM2.5, aerosol optical depth, and precipitation over Africa
Catherine Anne Toolan, Joe Adabouk Amooli, Laura J. Wilcox, Bjørn H. Samset, Andrew G. Turner, and Daniel M. Westervelt
EGUsphere, https://doi.org/10.5194/egusphere-2024-3057, https://doi.org/10.5194/egusphere-2024-3057, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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Our research explores how well air pollution and rainfall patterns in Africa are represented in current climate models, by comparing model data to observations from 1981 to 2023. While most models capture seasonal air quality changes well, they struggle to replicate the distribution of non-dust pollutants and certain rainfall patterns, especially over east Africa. Improving these models is crucial for better climate predictions and preparing for future risks.
23 Oct 2024
Retrieval of microphysical properties of dust aerosols from extinction, backscattering and depolarization lidar measurements using various particle scattering models
Yuyang Chang, Qiaoyun Hu, Philippe Goloub, Thierry Podvin, Igor Veselovskii, Fabrice Ducos, Gaël Dubois, Masanori Saito, Anton Lopatin, Oleg Dubovik, and Cheng Chen
EGUsphere, https://doi.org/10.5194/egusphere-2024-2655, https://doi.org/10.5194/egusphere-2024-2655, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Our study retrieved dust aerosol microphysical properties from lidar measurements using different scattering models. Numeric simulations and real data applications revealed the importance of considering depolarization measurements and particle non-sphericity to improve retrieval accuracy. Contrasts of the non-spherical scattering models in simulating particle backscattering properties, particularly the depolarization ratio, enlarge the difference of retrievals derived using these models.
22 Oct 2024
Reactivity study of 3,3-dimethylbutanal and 3,3-dimethylbutanone: Kinetic, reaction products, mechanisms and atmospheric implications
Inmaculada Aranda, Sagrario Salgado, Beatriz Cabañas, Florentina Villanueva, and Pilar Martin
EGUsphere, https://doi.org/10.5194/egusphere-2024-3241, https://doi.org/10.5194/egusphere-2024-3241, 2024
Revised manuscript accepted for ACP (discussion: final response, 12 comments)
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3,3-dimethylbutanal and 3,3-dimethylbutanone are compounds that might play a big role in the chemistry of the atmosphere. To better understand their effects, the rate at which these reactions happens was measured and the reaction products were identified. The results of this study show that these compounds degrade near their sources, so they don’t have direct impact on climate. However, they can contribute to the formation of tropospheric O3 and secondary organic aerosols affecting our health.
22 Oct 2024
Sensitivity of ice cloud radiative heating to optical, macro- and microphysical properties
Edgardo I. Sepulveda Araya, Sylvia C. Sullivan, and Aiko Voigt
EGUsphere, https://doi.org/10.5194/egusphere-2024-3212, https://doi.org/10.5194/egusphere-2024-3212, 2024
Revised manuscript under review for ACP (discussion: final response, 3 comments)
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Clouds composed of ice crystals are key when evaluating atmospheric radiation. The morphology of the crystals found in clouds is not clear yet, and even less clear is the impact on cloud heating rate, which is essential to describe precipitation and wind patterns. This motivated us to study how the heating rate behaves under a variety of ice complexity and environmental conditions, finding that increasing complexity in high and dense clouds weakens the heating rate.
22 Oct 2024
Copper accelerates photochemically induced radical chemistry of iron-containing SOA
Kevin Kilchhofer, Markus Ammann, Laura Torrent, Ka Yuen Cheung, and Peter Aaron Alpert
EGUsphere, https://doi.org/10.5194/egusphere-2024-3226, https://doi.org/10.5194/egusphere-2024-3226, 2024
Revised manuscript under review for ACP (discussion: final response, 3 comments)
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Aerosol particles composed of metal complexes generate radicals as the result of photochemical reactions. Reactive species generated are hazardous to human health. We report microscopy data with particles composed of an organic proxy exposed to UV light. We found that copper influenced the reoxidation and initial iron reduction via photolysis of the complex. New model results suggest that we need to account a decreased photochemical activity and use a copper-induced reoxidation reaction.
22 Oct 2024
Heterogeneous Phototransformation of Halogenated Polycyclic Aromatic Hydrocarbons: Influencing Factors, Mechanisms and Products
Yueyao Yang, Yahui Liu, Guohua Zhu, Bingcheng Lin, Shanshan Zhang, Xin Li, Fangxi Xu, He Niu, Rong Jin, and Minghui Zheng
EGUsphere, https://doi.org/10.5194/egusphere-2024-2814, https://doi.org/10.5194/egusphere-2024-2814, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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Halogenated polycyclic aromatic hydrocarbons (XPAHs) are emerging pollutants. The stability during the atmospheric transformation processes is crucial for predicting their environmental fate and assessing associated risks. Here, we conducted field studies and laboratory simulation experiments to reveal the mechanisms, influencing factors and products for XPAHs’ heterogeneous phototransformation. Results revealed that the conversion of XPAHs led to a reduction in environmental risk.
22 Oct 2024
Trends and Drivers of Soluble Iron Deposition from East Asian Dust to the Northwest Pacific: A Springtime Analysis (2001–2017)
Hanzheng Zhu, Yaman Liu, Man Yue, Shihui Feng, Pingqing Fu, Kan Huang, Xinyi Dong, and Minghuai Wang
EGUsphere, https://doi.org/10.5194/egusphere-2024-2293, https://doi.org/10.5194/egusphere-2024-2293, 2024
Revised manuscript accepted for ACP (discussion: final response, 5 comments)
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Dust soluble iron deposition from East Asia plays an important role in the marine ecology of the Northwest Pacific. Using the developed model, our findings highlight a dual trend: a decrease in the overall deposition of soluble iron from dust, but an increase in the solubility of the iron itself due to the enhanced atmospheric processing. It underscores the critical roles of both dust emission and atmospheric processing in soluble iron deposition and marine ecology.
22 Oct 2024
Impact of post monsoon crop residue burning on PM2.5 over North India: Optimizing emissions using a high-density in situ surface observation network
Mizuo Kajino, Kentaro Ishijima, Joseph Ching, Kazuyo Yamaji, Rio Ishikawa, Tomoki Kajikawa, Tanbir Singh, Tomoki Nakayama, Yutaka Matsumi, Koyo Kojima, Prabir K. Patra, and Sachiko Hayashida
EGUsphere, https://doi.org/10.5194/egusphere-2024-1811, https://doi.org/10.5194/egusphere-2024-1811, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Air pollution in Delhi during post monsoon period is severe and association with intensive crop residue burning (CRB) over Punjab state has attracted attention. However, the relationship has been unclear as the CRB emissions conventionally derived from satellites were underestimated due to clouds and haze over the region. We evaluated the impact of CRB on PM2.5 as about 50 %, based on a combination of numerical modeling and high-density observation network using low-cost sensors we installed.
21 Oct 2024
Mixing state, spatial distribution, sources and photochemical enhancement to sulfate formation of black carbon particles in the Arctic Ocean during summer
Longquan Wang, Jinpei Yan, Afeng Chen, Bei Jiang, Fange Yue, Xiawei Yu, and Zhouqing Xie
EGUsphere, https://doi.org/10.5194/egusphere-2024-2706, https://doi.org/10.5194/egusphere-2024-2706, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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Our research analyzes black carbon particles from atmospheric samples to understand their mixing state and sources. We identified six types, with over half originating from biomass burning, significantly impacting the Arctic. These particles also enhance sulfate formation, further affect climate. Our findings highlight the role of black carbon in climate change, emphasizing the need for detailed studies in sensitive regions like the Arctic.
18 Oct 2024
Observation and modelling of atmospheric OH and HO2 radicals at a subtropical rural site and implications for secondary pollutants
Zhouxing Zou, Tianshu Chen, Qianjie Chen, Weihang Sun, Shichun Han, Zhuoyue Ren, Xinyi Li, Wei Song, Aoqi Ge, Qi Wang, Xiao Tian, Chenglei Pei, Xinming Wang, Yanli Zhang, and Tao Wang
EGUsphere, https://doi.org/10.5194/egusphere-2024-3210, https://doi.org/10.5194/egusphere-2024-3210, 2024
Revised manuscript under review for ACP (discussion: final response, 6 comments)
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We measured ambient OH and HO2 concentrations at a subtropical rural site and compared our observations with model results. During warm periods, the model overestimated the concentrations of OH and HO2, leading to overestimation of ozone and nitric acid production. Our findings highlight the need to better understand how OH and HO2are formed and removed, which is important for accurate air quality and climate predictions.
18 Oct 2024
Explaining the period fluctuation of the quasi-biennial oscillation
Young-Ha Kim
EGUsphere, https://doi.org/10.5194/egusphere-2024-3195, https://doi.org/10.5194/egusphere-2024-3195, 2024
Revised manuscript accepted for ACP (discussion: final response, 5 comments)
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Executive editor
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The paper addresses a fundamental but unresolved question about the stratospheric wind oscillation: why does the period of the oscillation fluctuate irregularly? We use global reanalysis data to provide evidence that the oscillation period is primarily modulated by seasonal variations in small-scale atmospheric wave activity. The findings have implications for seasonal and climate predictions.
Executive editor
The cause of fluctuations of the stratospheric quasi-biennial oscillation (QBO) period has been debated since its discovery. Explanations for variations in the QBO period are of great interest given the relevance of the QBO as one of the major modes of atmospheric interannual variability that affects not only the tropics, but also on the surface weather and climate in the extra-tropics. This study analyses the latest versions of atmospheric reanalyses, which resolve a part of the gravity wave spectrum, to show that the period fluctuations can be explained by seasonal variations in the forcing by small-scale (gravity) waves in the equatorial region. In doing so, the study improves our understanding of one of the fundamental modes of stratospheric variability and suggests that improvements in our ability to capture multi-scale interactions in the models can improve the accuracy of seasonal forecasts and the reliability of future climate projections.
18 Oct 2024
Machine Learning Assisted Chemical Characterization and Optical Properties of Atmospheric Brown Carbon in Nanjing, China
Yu Huang, Xingru Li, Dan Dan Huang, Ruoyuan Lei, Binhuang Zhou, Yunjiang Zhang, and Xinlei Ge
EGUsphere, https://doi.org/10.5194/egusphere-2024-2757, https://doi.org/10.5194/egusphere-2024-2757, 2024
Revised manuscript under review for ACP (discussion: final response, 3 comments)
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This work performed a comprehensive investigation on the chemical and optical properties of the brown carbon in PM2.5 samples collected in Nanjing, China. In particular, we used the machine learning approach to identify a list of key BrC species, which can be a good reference for future studies. Our findings extend the understanding on BrC properties and are valuable to the assessment of its impact on air quality and radiative forcing.
17 Oct 2024
Implications of Reduced-Complexity Aerosol Thermodynamics on Organic Aerosol Mass Concentration and Composition over North America
Camilo Serrano Damha, Kyle Gorkowski, and Andreas Zuend
EGUsphere, https://doi.org/10.5194/egusphere-2024-2712, https://doi.org/10.5194/egusphere-2024-2712, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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Executive editor
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Organic aerosol water content impacts the gas–particle partitioning of semivolatile organics. We used an aerosol thermodynamic model in the GEOS-Chem chemical transport model to efficiently account for organic aerosol water uptake and nonideal mixing. This led to a substantial enhancement in mean organic aerosol mass concentration with respect to GEOS-Chem's most advanced scheme. The water-sensitive scheme could be a valuable tool for reconciling model estimations and field measurements.
Executive editor
It is widely accepted that secondary organic aerosols formed from the atmospheric processing of biogenic and anthropogenic VOCs represent a major component of particulate matter globally, affecting air quality, meteorology and climate, but predictive skill in atmospheric models remains poor. It has previously been theorised that water vapour may assist organic molecules forming particulates by condensing together, but until now this process has not generally been implemented in models. This paper demonstrates that by including this process using a new efficient parameterisation in the popular GEOS-CHEM global chemistry model, the effects on predicted aerosol formation can be substantial, so this effect warrants consideration going forward.
17 Oct 2024
Impacts of Sea Ice Leads on Sea Salt Aerosols and Atmospheric Chemistry in the Arctic
Erin Emme and Hannah Horowitz
EGUsphere, https://doi.org/10.5194/egusphere-2024-3147, https://doi.org/10.5194/egusphere-2024-3147, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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There is uncertainty in the sources of Arctic cold season (November-April) sea salt aerosols. Using a chemical transport model and satellite observations, we quantify Arctic-wide sea salt aerosol emissions from fractures in sea ice, called open sea ice leads, and their atmospheric chemistry impacts for the cold season. We show sea ice leads contribute to Arctic sea salt aerosols and bromine, especially in under-observed regions.
16 Oct 2024
Influence of nitrogen oxides and volatile organic compounds emission changes on tropospheric ozone variability, trends and radiative effect
Suvarna Fadnavis, Yasin Elshorbany, Jerald Ziemke, Brice Barret, Alexandru Rap, P. R. Satheesh Chandran, Richard Pope, Vijay Sagar, Domenico Taraborrelli, Eric Le Flochmoen, Juan Cuesta, Catherine Wespes, Folkert Boersma, Isolde Glissenaar, Isabelle De Smedt, Michel Van Roozendael, Hervé Petetin, and Isidora Anglou
EGUsphere, https://doi.org/10.5194/egusphere-2024-3050, https://doi.org/10.5194/egusphere-2024-3050, 2024
Revised manuscript under review for ACP (discussion: final response, 7 comments)
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Satellites and model simulations show enhancement in tropospheric ozone, which is highly impacted by human-produced Nitrous oxides compared to volatile organic compounds. The increased amount of ozone enhances ozone radiative forcing. The ozone enhancement and associated radiative forcing are highest over South and East Asia. The emissions of Nitrous oxides show a higher influence in shifting ozone photochemical regimes than volatile organic compounds.
15 Oct 2024
Measurement report: The influence of particle number size distribution and hygroscopicity on the microphysical properties of cloud droplets at a mountain site
Xiaojing Shen, Quan Liu, Junying Sun, Wanlin Kong, Qianli Ma, Bing Qi, Lujie Han, Yangmei Zhang, Linlin Liang, Lei Liu, Shuo Liu, Xinyao Hu, Jiayuan Lu, Aoyuan Yu, Huizheng Che, and Xiaoye Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2024-2850, https://doi.org/10.5194/egusphere-2024-2850, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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In this work, an automatic switched inlet system was developed and employed to investigate the aerosols and cloud droplets at a mountain site with frequent cloud processes. It showed different characteristics of cloud residual and interstitial particles. Stronger particle hygroscopicity reduced liquid water content and smaller cloud droplet diameters. This investigation contributes to understanding aerosol-cloud interactions by assessing the impact of aerosol particles on cloud microphysics.
15 Oct 2024
The Modulation of Synoptic Weather Patterns and Human Activities on the Diurnal Cycle of Summertime Canopy Urban Heat Island in Yangtze River Delta Urban Agglomeration, China
Tao Shi, Yuanjian Yang, Lian Zong, Min Guo, Ping Qi, and Simone Lolli
EGUsphere, https://doi.org/10.5194/egusphere-2024-3111, https://doi.org/10.5194/egusphere-2024-3111, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Our study explored the daily temperature patterns in urban areas of the Yangtze River Delta, focusing on how weather and human activities impact these patterns. We found that temperatures were higher at night, and weather patterns had a bigger impact during the day, while human activities mattered more at night. This helps us understand and address urban overheating.
15 Oct 2024
Molecular characterization of organic aerosols in urban and forested areas of Paris using high resolution mass spectrometry
Diana L. Pereira, Chiara Giorio, Aline Gratien, Alexander Zherebker, Gael Noyalet, Servanne Chevaillier, Stéphanie Alage, Elie Almarj, Antonin Bergé, Thomas Bertin, Mathieu Cazaunau, Patrice Coll, Ludovico Di Antonio, Sergio Harb, Johannes Heuser, Cécile Gaimoz, Oscar Guillemant, Brigitte Language, Olivier Lauret, Camilo Macias, Franck Maisonneuve, Bénédicte Picquet-Varrault, Raquel Torres, Sylvain Triquet, Pascal Zapf, Lelia Hawkins, Drew Pronovost, Sydney Riley, Pierre-Marie Flaud, Emilie Perraudin, Pauline Pouyes, Eric Villenave, Alexandre Albinet, Olivier Favez, Robin Aujay-Plouzeau, Vincent Michoud, Christopher Cantrell, Manuela Cirtog, Claudia Di Biagio, Jean-François Doussin, and Paola Formenti
EGUsphere, https://doi.org/10.5194/egusphere-2024-3015, https://doi.org/10.5194/egusphere-2024-3015, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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In order to study aerosols in environments influenced by anthropogenic and biogenic emissions, we performed analysis of samples collected during ACROSS (Atmospheric Chemistry Of the Suburban Forest) campaign in the summer 2022 in the Paris greater area. After analysis of the chemical composition by means of total carbon determination and high resolution mass spectrometry, this work highlights the influence of anthropogenic inputs into the chemical composition of both urban and forested areas.
14 Oct 2024
Drivers of change in Peak Season Surface Ozone Concentrations and Impacts on Human Health over the Historical Period (1850–2014)
Steven Turnock, Dimitris Akritidis, Larry Horowitz, Mariano Mertens, Andrea Pozzer, Carly Reddington, Hantao Wang, Putian Zhou, and Fiona O'Connor
EGUsphere, https://doi.org/10.5194/egusphere-2024-2732, https://doi.org/10.5194/egusphere-2024-2732, 2024
Revised manuscript under review for ACP (discussion: final response, 5 comments)
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We assess the drivers behind changes in peak season surface zone concentrations and risk to human health between 1850 and 2014. Substantial increases in surface ozone have occurred over this period resulting in a significant increase in the risk to human health, mainly driven by increases in anthropogenic NOx emissions and global CH4 concentrations. Fixing anthropogenic NOx emissions at 1850 values in the near present-day period can eliminate the risk to human health.
14 Oct 2024
Increase in Carbon Monoxide (CO) and Aerosol Optical Depth (AOD) observed by satellite in the northern hemisphere over the summers of 2008–2023, linked to an increase in wildfires
Antoine Ehret, Solène Turquety, Maya George, Juliette Hadji-Lazaro, and Cathy Clerbaux
EGUsphere, https://doi.org/10.5194/egusphere-2024-3128, https://doi.org/10.5194/egusphere-2024-3128, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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Biomass burning has a considerable effect on the chemical composition of the atmosphere and climate, due to the emission of trace gases and aerosols. We examine the relationship between fire variability and the values of carbon monoxide and aerosol optical depth observed by satellite. The observed increase in wildfires has led to a corresponding rise in the mean and extreme values of carbon monoxide and aerosol optical depth during the summer and early autumn across the northern hemisphere.
14 Oct 2024
Toward a Learnable Artificial Intelligence Model for Aerosol Chemistry and Interactions (AIMACI) based on the Multi-Head Self-Attention Algorithm
Zihan Xia, Chun Zhao, Zining Yang, Qiuyan Du, Jiawang Feng, Chen Jin, Jun Shi, and Hong An
EGUsphere, https://doi.org/10.5194/egusphere-2024-2860, https://doi.org/10.5194/egusphere-2024-2860, 2024
Revised manuscript under review for ACP (discussion: final response, 3 comments)
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Traditional numerical scheme of aerosol chemistry and interactions (ACI) in atmospheric model is computationally intensive, often being simplified or omitted, thus introducing considerable uncertainties. We are the first to successfully use AI scheme to replace numerical scheme for ACI within atmospheric model. This innovation provides fast, accurate, and stable aerosol simulation, expected to enhancing both accuracy and efficiency in climate model.
11 Oct 2024
Analysis of ship emission effects on clouds over the southeastern Atlantic using geostationary satellite observations
Nikos Benas, Jan Fokke Meirink, Rob Roebeling, and Martin Stengel
EGUsphere, https://doi.org/10.5194/egusphere-2024-3135, https://doi.org/10.5194/egusphere-2024-3135, 2024
Revised manuscript under review for ACP (discussion: final response, 6 comments)
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This study examines how ship emissions affect clouds over a shipping corridor in the southeastern Atlantic. Using satellite data from 2004 to 2023, we find that ship emissions increase the number of cloud droplets while reducing their size, and slightly decrease cloud water content. Effects on seasonal and daily patterns vary based on regional factors. The impact of emissions weakened after stricter regulations were implemented in 2020.
11 Oct 2024
High-resolution mapping of on-road vehicle emissions with real-time traffic datasets based on big data
Yujia Wang, Hongbin Wang, Bo Zhang, Peng Liu, Xinfeng Wang, Shuchun Si, Likun Xue, Qingzhu Zhang, and Qiao Wang
EGUsphere, https://doi.org/10.5194/egusphere-2024-2791, https://doi.org/10.5194/egusphere-2024-2791, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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This study established a bottom-up approach that employs real-time traffic flows and interpolation to obtain a spatially continuous on-road vehicle emission mapping for the main urban area of Jinan. The diurnal variation, spatial distribution, and emission hotspots were analyzed with clustering and hotspot analysis, showing unique fine-scale variation characteristics of on-road vehicle emissions. Future scenario analysis demonstrates remarkable benefits of electrification on emission reduction.
11 Oct 2024
How to trace the origins of short-lived atmospheric species in the Arctic
Anderson Da Silva, Louis Marelle, Jean-Christophe Raut, Yvette Gramlich, Karolina Siegel, Sophie L. Haslett, Claudia Mohr, and Jennie L. Thomas
EGUsphere, https://doi.org/10.5194/egusphere-2024-2839, https://doi.org/10.5194/egusphere-2024-2839, 2024
Revised manuscript accepted for ACP (discussion: final response, 5 comments)
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Particles sources in polar climates are unclear, affecting climate representation in models. This study introduces an evaluated method for tracking particles with backtrajectory modeling. Tests on simulated particles allowed to show that traditional detection methods often misidentify sources. An improved method that accurately traces origins of aerosol particles in the Arctic is presented. The study recommends using this enhanced method for better source identification of atmospheric species.
09 Oct 2024
Evaluation and updates to the oxidized reactive nitrogen trace gas dry deposition parameterization from the GEOS-Chem CTM, including a pathway for ground surface NO2 hydrolysis
Brian L. Boys, Randall V. Martin, and Trevor C. VandenBoer
EGUsphere, https://doi.org/10.5194/egusphere-2024-2994, https://doi.org/10.5194/egusphere-2024-2994, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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A widely used dry deposition parameterization for NO2 is updated by including a well-known heterogeneous hydrolysis reaction on deposition surfaces. This mechanistic update eliminates a large low bias of -80 % in simulated NO2 nocturnal deposition velocities evaluated against long-term eddy covariance flux observations over Harvard Forest. We highlight the importance of canopy surface area effects as well as soil NO emission in formulating and evaluating NO2 dry deposition parameterizations.
09 Oct 2024
Spectral optical properties of soot: laboratory investigation of propane flame particles and their link to composition
Johannes Heuser, Claudia Di Biagio, Jerome Yon, Mathieu Cazaunau, Antonin Bergé, Edouard Pangui, Marco Zanatta, Laura Renzi, Angela Marinoni, Satoshi Inomata, Chenjie Yu, Vera Bernardoni, Servanne Chevaillier, Daniel Ferry, Paolo Laj, Michel Maillé, Dario Massabò, Federico Mazzei, Gael Noyalet, Hiroshi Tanimoto, Brice Temime-Roussel, Roberta Vecchi, Virginia Vernocchi, Paola Formenti, Bénédicte Picquet-Varrault, and Jean-François Doussin
EGUsphere, https://doi.org/10.5194/egusphere-2024-2381, https://doi.org/10.5194/egusphere-2024-2381, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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The spectral optical properties of combustion soot aerosols with varying black (BC) and brown carbon (BrC) content were studied in an atmospheric simulation chamber. Measurements of the mass spectral absorption cross section (MAC), supplement by literature data, allowed to establish a generalized exponential relationship between the spectral MAC and the elemental-to-total carbon ratio (EC/TC) in soot. This relationship can provide a useful tool for modelling the properties of soot.
09 Oct 2024
Dimethyl sulfide chemistry over the industrial era: comparison of key oxidation mechanisms and long-term observations
Ursula A. Jongebloed, Jacob I. Chalif, Linia Tashmim, William C. Porter, Kelvin H. Bates, Qianjie Chen, Erich C. Osterberg, Bess G. Koffman, Jihong Cole-Dai, Dominic A. Winksi, David G. Ferris, Karl J. Kreutz, Cameron P. Wake, and Becky Alexander
EGUsphere, https://doi.org/10.5194/egusphere-2024-3026, https://doi.org/10.5194/egusphere-2024-3026, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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Marine phytoplankton emit dimethyl sulfide (DMS), which forms methanesulfonic acid (MSA) and sulfate. MSA concentrations in ice cores decreased over the industrial era, which has been attributed to pollution-driven changes in DMS chemistry. We use a models to investigate DMS chemistry compared to observations of DMS, MSA, and sulfate. We find that modeled DMS, MSA, and sulfate are influenced by pollution-sensitive oxidant concentrations, characterization of DMS chemistry, and other variables.
09 Oct 2024
Ozone dry deposition through plant stomata: Multi-model comparison with flux observations and the role of water stress as part of AQMEII4 Activity 2
Anam M. Khan, Olivia E. Clifton, Jesse O. Bash, Sam Bland, Nathan Booth, Philip Cheung, Lisa Emberson, Johannes Flemming, Erick Fredj, Stefano Galmarini, Laurens Ganzeveld, Orestis Gazetas, Ignacio Goded, Christian Hogrefe, Christopher D. Holmes, Laszlo Horvath, Vincent Huijnen, Qian Li, Paul A. Makar, Ivan Mammarella, Giovanni Manca, J. William Munger, Juan L. Perez-Camanyo, Jonathan Pleim, Limei Ran, Roberto San Jose, Donna Schwede, Sam J. Silva, Ralf Staebler, Shihan Sun, Amos P. K. Tai, Eran Tas, Timo Vesala, Tamas Weidinger, Zhiyong Wu, Leiming Zhang, and Paul C. Stoy
EGUsphere, https://doi.org/10.5194/egusphere-2024-3038, https://doi.org/10.5194/egusphere-2024-3038, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Vegetation removes tropospheric ozone through stomatal uptake, and accurately modeling the stomatal uptake of ozone is important for modeling dry deposition and air quality. We evaluated the stomatal component of ozone dry deposition modeled by atmospheric chemistry models at six sites. We find that models and observation-based estimates agree at times during the growing season at all sites, but some models overestimated the stomatal component during the dry summers at a seasonally dry site.
08 Oct 2024
Two-years of stratospheric chemistry perturbations from the 2019/2020 Australian wildfire smoke
Kane Stone, Susan Solomon, Pengfei Yu, Daniel M. Murphy, Douglas Kinnison, and Jian Guan
EGUsphere, https://doi.org/10.5194/egusphere-2024-2948, https://doi.org/10.5194/egusphere-2024-2948, 2024
Preprint under review for ACP (discussion: final response, 4 comments)
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The Australian 2019/2020 wildfires injected a substantial amount of smoke into the upper atmosphere, causing unusual chemical reactions that altered the chemical makeup of the upper atmosphere. This led to ozone depletion in the Southern hemisphere midlatitudes which likely didn't fully recover until 2 years after the initial event due to the persistent chemical effects of the smoke.
08 Oct 2024
Shallow cloud variability in Houston, Texas during the ESCAPE and TRACER field experiments
Zackary Mages, Pavlos Kollias, Bernat Puigdomenech Treserras, Paloma Borque, and Mariko Oue
EGUsphere, https://doi.org/10.5194/egusphere-2024-2984, https://doi.org/10.5194/egusphere-2024-2984, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Convective clouds are a key component of the climate system. Using remote sensing observations during two field experiments in Houston, Texas, we identify four diurnal patterns of shallow convective clouds. We find areas more frequently experiencing shallow convective clouds, and we find areas where the vertical extent of shallow convective clouds is higher and where they are more likely to precipitate. This provides insight into the complicated environment that forms these clouds in Houston.
08 Oct 2024
Dust-producing weather patterns of the North American Great Plains
Stuart Evans
EGUsphere, https://doi.org/10.5194/egusphere-2024-2820, https://doi.org/10.5194/egusphere-2024-2820, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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This study of the North American Great Plains identifies the various weather patterns responsible for blowing dust in all parts of the region using a weather pattern classification. In the southwest plains passing cold fronts are the primary cause of dust; in the understudied northern plains, summertime patterns and southerly pre-frontal winds are most important in the west and east, respectively. These results are valuable to understanding and forecasting dust in this complex source region.
07 Oct 2024
Natural Surface Emissions Dominate Anthropogenic Emissions Contributions to Total Gaseous Mercury (TGM) at Canadian Rural Sites
Irene Cheng, Amanda Cole, Leiming Zhang, and Alexandra Steffen
EGUsphere, https://doi.org/10.5194/egusphere-2024-2895, https://doi.org/10.5194/egusphere-2024-2895, 2024
Preprint under review for ACP (discussion: final response, 4 comments)
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Using the Positive Matrix Factorization (PMF) model and observations, we showed natural surface emission (wildfires and re-emitted Hg) dominated anthropogenic contributions to total gaseous mercury (TGM). Decreasing TGM was due to reduced shipping and regional emissions. This has led to increasing relative contributions from natural surface emissions of 1.0–1.6 % yr-1. Results showed Hg control measures have been effective, but greater attention is needed on monitoring surface re-emissions.
07 Oct 2024
Measurement report: Wintertime aerosol characterization at an urban traffic site in Helsinki Finland
Kimmo Teinilä, Sanna Saarikoski, Henna Lintusaari, Teemu Lepistö, Petteri Marjanen, Minna Aurela, Heidi Hellén, Toni Tykkä, Markus Lampimäki, Janne Lampilahti, Luis Barreira, Timo Mäkelä, Leena Kangas, Juha Hatakka, Sami Harni, Joel Kuula, Jarkko V. Niemi, Harri Portin, Jaakko Yli-Ojanperä, Ville Niemelä, Milja Jäppi, Katrianne Lehtipalo, Joonas Vanhanen, Liisa Pirjola, Hanna E. Manninen, Tuukka Petäjä, Topi Rönkkö, and Hilkka Timonen
EGUsphere, https://doi.org/10.5194/egusphere-2024-2235, https://doi.org/10.5194/egusphere-2024-2235, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Physical and chemical properties of particulate matter and concentrations of trace gases were measured in a street canyon in Helsinki, Finland and an urban background site in January–February 2022 to investigate the effect of wintertime conditions on pollutants. State-of-the-art instruments, a mobile laboratory was used, and the measurement data was further analysed with modelling tools like positive matrix factorization (PMF) and pollution detection algorithm (PDA).
02 Oct 2024
CloudViT: classifying cloud types in global satellite data and in kilometre-resolution simulations using vision transformers
Julien Lenhardt, Johannes Quaas, Dino Sejdinovic, and Daniel Klocke
EGUsphere, https://doi.org/10.5194/egusphere-2024-2724, https://doi.org/10.5194/egusphere-2024-2724, 2024
Revised manuscript under review for ACP (discussion: final response, 6 comments)
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Clouds come in various shapes and sizes and constitute a fundamental element of the Earth’s climate system. Different cloud types show variable impacts on climate change. We present a new cloud type classification method called CloudViT relying on spatial patterns of cloud properties obtained from satellite data using machine learning. We can thus help understanding the effects of different cloud types on climate change.
01 Oct 2024
Chemistry-climate feedback of atmospheric methane in a methane emission flux driven chemistry-climate model
Laura Stecher, Franziska Winterstein, Patrick Jöckel, Michael Ponater, Mariano Mertens, and Martin Dameris
EGUsphere, https://doi.org/10.5194/egusphere-2024-2938, https://doi.org/10.5194/egusphere-2024-2938, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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Methane, the second most important anthropogenic greenhouse gas, is chemically decomposed in the atmosphere. The chemical sink of atmospheric methane is not constant, but depends on the temperature and on the abundance of its reaction partners. In this study, we use a global chemistry-climate model to assess the feedback of atmospheric methane induced by changes of the chemical sink in a warming climate, and its implications for the chemical composition and the surface air temperature change.
01 Oct 2024
Measurement report: Characterization of Aerosol Hygroscopicity over Southeast Asia during the NASA CAMP2Ex Campaign
Genevieve Rose Lorenzo, Luke D. Ziemba, Avelino F. Arellano, Mary C. Barth, Ewan C. Crosbie, Joshua P. DiGangi, Glenn S. Diskin, Richard Ferrare, Miguel Ricardo A. Hilario, Michael A. Shook, Simone Tilmes, Jian Wang, Qian Xiao, Jun Zhang, and Armin Sorooshian
EGUsphere, https://doi.org/10.5194/egusphere-2024-2604, https://doi.org/10.5194/egusphere-2024-2604, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Novel aerosol hygroscopicity analysis of CAMP2Ex field campaign data show low aerosol hygroscopicity values in Southeast Asia. Organic carbon from smoke decreases hygroscopicity to levels more like those in continental than in polluted marine regions. Hygroscopicity changes at cloud level demonstrate how surface particles impact clouds in the region affecting model representation of aerosol and cloud interactions in similar polluted marine regions with high organic carbon emissions.
01 Oct 2024
Quantifying the sources of increasing stratospheric water vapour concentrations in the 21st century
Patrick E. Sheese, Kaley A. Walker, Chris D. Boone, and David A. Plummer
EGUsphere, https://doi.org/10.5194/egusphere-2024-2946, https://doi.org/10.5194/egusphere-2024-2946, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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Observations from ACE-FTS are used to examine global stratospheric water vapour trends for 2004–2021. The satellite measurements are used to quantify trend contributions arising from changes in tropical tropopause temperatures, general circulation patterns, and methane concentrations. While most of the observed trends can be explained by these changes, there remains an unaccounted for and increasing source of water vapour in the lower mid-stratosphere at midlatitudes, which is discussed.
30 Sep 2024
Shortwave Radiative Impacts of the Asian Tropopause Aerosol Layer (ATAL) using Balloon-borne In-situ measurements at three distinct locations in India
Vadassery Neelamana Santhosh, Bomidi Lakshmi Madhavan, Sivan Thankamani Akhil Raj, Madineni Venkat Ratnam, Jean-Paul Vernier, and Frank Gunther Wienhold
EGUsphere, https://doi.org/10.5194/egusphere-2024-2861, https://doi.org/10.5194/egusphere-2024-2861, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Our study examines a lesser-known atmospheric feature, the Asian Tropopause Aerosol Layer, located high above Earth. We investigated how different aerosols, such as sulfates, nitrates, and pollutants, influence heat entering and leaving the atmosphere. The results show that these particles can alter temperature patterns, especially during the Asian summer monsoon. This research improves our understanding of how human activities may affect regional climate.
30 Sep 2024
Measurement report: Aircraft observations of aerosol and microphysical quantities of stratocumulus in autumn over Guangxi Province, China: Diurnal variation, vertical distribution and aerosol-cloud relationship
Sihan Liu, Honglei Wang, Delong Zhao, Wei Zhou, Yuanmou Du, Zhengguo Zhang, Peng Cheng, Tianliang Zhao, Yue Ke, Zihao Wu, and Mengyu Huang
EGUsphere, https://doi.org/10.5194/egusphere-2024-2756, https://doi.org/10.5194/egusphere-2024-2756, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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To understand the effect of aerosols on the vertical distribution of stratocumulus microphysical quantities in southwest China, the daily variation characteristics and formation mechanism of the vertical profiles of stratocumulus microphysical characteristics in this region were described by using the data of 9 cloud-crossing aircraft observations over Guangxi from October 10 to November 3, 2020.
30 Sep 2024
Locating and quantifying CH4 sources within a wastewater treatment plant based on mobile measurements
Junyue Yang, Zhengning Xu, Zheng Xia, Xiangyu Pei, Yunye Yang, Botian Qiu, Shuang Zhao, Yuzhong Zhang, and Zhibin Wang
EGUsphere, https://doi.org/10.5194/egusphere-2024-2522, https://doi.org/10.5194/egusphere-2024-2522, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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CH4 mobile measurements are conducted in a wastewater treatment plant in the summer and winter of Hangzhou 2023. The multi-source Gaussian plume model combined with a genetic algorithm inversion framework is used to locate major sources in the plant and quantify the CH4 emissions. Results indicate the summer CH4emissions (603.33 ± 152.66 t a-1) is 2.8 times that of the inventory, and the winter (418.95 ± 187.59 t a-1) is twice. The main sources are the screen and primary clarifier.
27 Sep 2024
Arctic Multilayer Clouds Require Accurate Thermodynamic Profiles and Efficient Primary and Secondary Ice Processes for a Realistic Structure and Composition
Gabriella Wallentin, Annika Oertel, Luisa Ickes, Peggy Achtert, Matthias Tesche, and Corinna Hoose
EGUsphere, https://doi.org/10.5194/egusphere-2024-2988, https://doi.org/10.5194/egusphere-2024-2988, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Multilayer clouds are common in the Arctic but remain understudied. We use an atmospheric model to simulate multilayer cloud cases from the Arctic expedition MOSAiC 2019/2020. We find that it is complex to accurately model these cloud layers due to the lack of correct temperature and humidity profiles. The model also struggles to capture the observed cloud phase, the relative concentration of cloud droplets and cloud ice. We constrain our model to measured aerosols to mitigate this issue.
26 Sep 2024
High-resolution greenhouse gas flux inversions using a machine learning surrogate model for atmospheric transport
Nikhil Dadheech, Tai-Long He, and Alexander J. Turner
EGUsphere, https://doi.org/10.5194/egusphere-2024-2918, https://doi.org/10.5194/egusphere-2024-2918, 2024
Revised manuscript accepted for ACP (discussion: final response, 7 comments)
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We developed an efficient GHG flux inversion framework using a machine learning emulator (FootNet) as a surrogate for an atmospheric transport model, resulting in a 650× speedup. Paradoxically, the flux inversion using the ML-model outperforms the full-physics model in our case study. We attribute this to the ML model mitigating transport errors in the GHG flux inversion.
25 Sep 2024
Measurement report: In-depth characterization of ship emissions during operations in a Mediterranean port
Lise Le Berre, Brice Temime-Roussel, Grazia Maria Lanzafame, Barbara D’Anna, Nicolas Marchand, Stéphane Sauvage, Marvin Dufresne, Liselotte Tinel, Thierry Leonardis, Joel Ferreira de Brito, Alexandre Armengaud, Grégory Gille, Ludovic Lanzi, Romain Bourjot, and Henri Wortham
EGUsphere, https://doi.org/10.5194/egusphere-2024-2903, https://doi.org/10.5194/egusphere-2024-2903, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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A summer campaign in a Mediterranean port examined pollution caused by ships. Two stations in the port measured pollution levels and captured over 350 ship plumes to study their chemical composition. Results showed that pollution levels, like ultra-fine particles, were higher in the port than in the city and offer a strong support to improve emission inventories. These findings may also serve as reference for assessing the benefits of a Sulphur Emission Control Area in the Mediterranean in 2025.
24 Sep 2024
Marine Organic Aerosols at Mace Head: Effects from Phytoplankton and Source Region Variability
Emmanuel Chevassus, Kirsten N. Fossum, Darius Ceburnis, Lu Lei, Chunshui Lin, Wei Xu, Colin D. O’ Dowd, and Jurgita Ovadnevaite
EGUsphere, https://doi.org/10.5194/egusphere-2024-2890, https://doi.org/10.5194/egusphere-2024-2890, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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This study presents the first source apportionment of OA at Mace Head via high-resolution mass spectrometry. Introducing transfer entropy as a novel method reveals that aged OA originate from open ocean ozonolysis and local peat burning oxidation. Methanesulphonic acid OA and primary marine OA both mirror phytoplankton activity as observed with their chemical makeup, with MSA-OA closely tied to coccolithophore blooms and PMOA linked to diatoms, chlorophytes, and cyanobacteria.
23 Sep 2024
Response of the link between ENSO and the East Asian winter monsoon to Asian anthropogenic aerosols
Zixuan Jia, Massimo A. Bollasina, Wenjun Zhang, and Ying Xiang
EGUsphere, https://doi.org/10.5194/egusphere-2024-2770, https://doi.org/10.5194/egusphere-2024-2770, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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Using multi-model mean data from regional aerosol perturbation experiments, we find that increased Asian sulfate aerosols strengthen the link between ENSO and the East Asian winter monsoon. In coupled simulations, aerosol-induced broad cooling increases ENSO amplitude by affecting the tropical Pacific mean state, contributing to increase monsoon interannual variability. These results provide important implications to reduce uncertainties in future projections of regional extreme variability.
23 Sep 2024
Effects of Ozone-Climate Interactions on the Temperature Variation in the Arctic Stratosphere
Siyi Zhao, Jiankai Zhang, Chongyang Zhang, and Zhe Wang
EGUsphere, https://doi.org/10.5194/egusphere-2024-2740, https://doi.org/10.5194/egusphere-2024-2740, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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By isolating the ozone-cycle coupling process, the study discusses how ozone-climate interaction affects the long-term change of the Arctic stratospheric temperature (AST). From 1980 to 1999, ozone-climate interactions increased AST by promoting upwave propagation and Brewer-Dobson circulation in early winter and reduced AST by reducing ozone shortwave heating in late winter and spring. Our results highlight the effect of ozone-climate interactions on intra-seasonal reversals of AST trends.
20 Sep 2024
Large Reductions in Satellite-Derived and Modelled European Lower Tropospheric Ozone During and After the COVID-19 Pandemic (2020–2022)
Matilda A. Pimlott, Richard J. Pope, Brian J. Kerridge, Richard Siddans, Barry G. Latter, Lucy J. Ventress, Wuhu Feng, and Martyn P. Chipperfield
EGUsphere, https://doi.org/10.5194/egusphere-2024-2736, https://doi.org/10.5194/egusphere-2024-2736, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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Globally, lockdowns were implemented to limit the spread of COVID-19, leading to a decrease in emissions of key air pollutants. Here, we use novel satellite data and a chemistry model to investigate the impact of the pandemic on tropospheric ozone (O3), a key pollutant, in 2020. Overall, we found substantial decreases of up to 20 %, 2/3s of which came from emission reductions while 1/3 was due to a decrease in the stratospheric ozone flux into the troposphere.
19 Sep 2024
Revisiting the high tropospheric ozone over Southern Africa: overestimated biomass burning and underestimated anthropogenic emissions
Yufen Wang, Ke Li, Xi Chen, Zhenjiang Yang, Minglong Tang, Pascoal M. D. Campos, Yang Yang, Xu Yue, and Hong Liao
EGUsphere, https://doi.org/10.5194/egusphere-2024-2576, https://doi.org/10.5194/egusphere-2024-2576, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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The impact of biomass burning and anthropogenic emissions on high tropospheric ozone was not well studied in Southern Africa. We combined the model simulation with recent observations at the surface and from space to quantify tropospheric ozone and its main drivers in Southern Africa. Our work focuses on the impact of emissions from different sources at different spatial scales, contributing to a comprehensive understanding of air pollution drivers and their uncertainties in Southern Africa.
18 Sep 2024
The monitoring network of greenhouse gas (CO2, CH4) in the Paris' region
Josselin Doc, Michel Ramonet, François-Marie Bréon, Delphine Combaz, Mali Chariot, Morgan Lopez, Marc Delmotte, Cristelle Cailteau-Fischbach, Guillaume Nief, Nathanaël Laporte, Thomas Lauvaux, and Philippe Ciais
EGUsphere, https://doi.org/10.5194/egusphere-2024-2826, https://doi.org/10.5194/egusphere-2024-2826, 2024
Preprint under review for ACP (discussion: open, 2 comments)
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Description of the network for measuring greenhouse gas concentrations in the Paris region and analysis of eight years of continuous monitoring.
18 Sep 2024
Source contribution to ozone pollution during June 2021 in Arizona: Insights from WRF-Chem tagged O3 and CO
Yafang Guo, Mohammad Amin Mirrezaei, Armin Sorooshian, and Avelino F. Arellano
EGUsphere, https://doi.org/10.5194/egusphere-2024-2617, https://doi.org/10.5194/egusphere-2024-2617, 2024
Revised manuscript accepted for ACP (discussion: final response, 9 comments)
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We assess the contributions of fire and anthropogenic emissions to O3 levels in Phoenix Arizona during a period of intense heat and drought conditions. We find that fire exacerbates O3 pollution and that interactions between weather, climate, and air chemistry are important to consider. This has implications to activities related to formulating emission reduction strategies in areas that are currently under-studied yet becoming relevant due to reports of increasing global aridity.
16 Sep 2024
Influence of Temperature and Humidity on Contrail Formation Regions in EMAC: A Spring Case Study
Patrick Peter, Sigrun Matthes, Christine Frömming, Patrick Jöckel, Luca Bugliaro, Andreas Giez, Martina Krämer, and Volker Grewe
EGUsphere, https://doi.org/10.5194/egusphere-2024-2142, https://doi.org/10.5194/egusphere-2024-2142, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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Our study examines how temperature and humidity representations influence contrail (-cirrus) formation criteria. Using various model setups, we identified biases that lead to overestimation of contrail formation areas. By comparing simulations with in-flight and satellite observations, we confirmed that humidity threshold choices greatly affect contrail predictions. These findings can help develop strategies for climate-optimized flight routes, potentially reducing aviation's climate effect.
16 Sep 2024
A Comprehensive Global Modelling Assessment of Nitrate Heterogeneous Formation on Desert Dust
Rubén Soussé-Villa, Oriol Jorba, María Gonçalves Ageitos, Dene Bowdalo, Marc Guevara, and Carlos Pérez García-Pando
EGUsphere, https://doi.org/10.5194/egusphere-2024-2310, https://doi.org/10.5194/egusphere-2024-2310, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Desert dust forms nitrate coatings as it travels through the atmosphere. However, current models that predict this process vary greatly due to different methods and inaccuracies. We examined how nitrate forms in a global model, focusing on how gases condense on dust, the lifespan of different particles, and the impact of alkalinity. Our findings show that models work best when they consider reversible gas condensation with alkalinity. This should lead to better estimates of climate impacts.
10 Sep 2024
Modeling CMAQ dry deposition treatment over Western Pacific: A distinct characteristic of mineral dust and anthropogenic aerosol
Steven Soon-Kai Kong, Joshua S. Fu, Neng-Huei Lin, Guey-Rong Sheu, and Wei-Syun Huang
EGUsphere, https://doi.org/10.5194/egusphere-2024-2549, https://doi.org/10.5194/egusphere-2024-2549, 2024
Preprint under review for ACP (discussion: final response, 6 comments)
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The accuracy of the chemical transport model, a key focus of our research, is strongly dependent on the dry deposition parameterization. Our finding shows that the refined CMAQ dust model correlated well with the ground and high altitude in-situ measurements by implementing the suggested dry deposition schemes. Furthermore, we reveal the mixing state of two types of aerosols at the upper level, a finding supported by both the optimized model and measurement.
09 Sep 2024
Spatiotemporal variations in atmospheric CH4 concentrations and enhancements in northern China based on a comprehensive dataset: Ground-based observations, TROPOMI data, inventory data and inversions
Pengfei Han, Ning Zeng, Bo Yao, Wen Zhang, Weijun Quan, Pucai Wang, Ting Wang, Minqiang Zhou, Qixiang Cai, Yuzhong Zhang, Ruosi Liang, Wanqi Sun, and Shengxiang Liu
EGUsphere, https://doi.org/10.5194/egusphere-2024-2162, https://doi.org/10.5194/egusphere-2024-2162, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Methane (CH4) is a potent greenhouse gas. Northern China contributes a large proportion of CH4 emissions yet large observation gaps are existed. Here we compiled a comprehensive dataset which is publicly available including ground-based, satellite-based, inventory and modeling results, to show the CH4 concentrations, enhancements and spatial-temporal variations. The data can benefit the research community, and policy makers for future observations, atmospheric inversions and policy-making.
09 Sep 2024
Technical note: A comparative study of chemistry schemes for volcanic sulfur dioxide in Lagrangian transport simulations: a case study of the 2019 Raikoke eruption
Mingzhao Liu, Lars Hoffmann, Jens-Uwe Grooß, Zhongyin Cai, Sabine Grießbach, and Yi Heng
EGUsphere, https://doi.org/10.5194/egusphere-2024-2596, https://doi.org/10.5194/egusphere-2024-2596, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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We studied the transport and chemical decomposition of volcanic SO2, focusing on the 2019 Raikoke event. By comparing two different chemistry modeling schemes, we found that including complex chemical reactions leads to a more accurate prediction of how long SO2 stays in the atmosphere. This research helps improve our understanding of volcanic pollution and its impact on air quality and climate, providing better tools for scientists to track and predict the movement of these pollutants.
09 Sep 2024
Aerosol Indirect Effects on Cirrus Clouds Based on Global-Scale Airborne Observations and Machine Learning Models
Derek Ngo, Minghui Diao, Ryan J. Patnaude, Sarah Woods, and Glenn Diskin
EGUsphere, https://doi.org/10.5194/egusphere-2024-2122, https://doi.org/10.5194/egusphere-2024-2122, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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Key controlling factors of cirrus clouds were individually quantified using machine learning models, based on global-scale in-situ observations compiled from 12 flight campaigns at 67° S – 87° N. Relative humidity shows much larger effects on cirrus occurrences than vertical velocity. Aerosol indirect effects are seen from both large and small aerosols, which affect predictions of cirrus occurrences. Large aerosols significantly improve predictions of ice water content but not small aerosols.
06 Sep 2024
Evaluating tropospheric nitrogen dioxide in UKCA using OMI satellite retrievals over South and East Asia
Alok K. Pandey, David S. Stevenson, Alcide Zhao, Richard J. Pope, Ryan Hossaini, Krishan Kumar, and Marytn P. Chipperfield
EGUsphere, https://doi.org/10.5194/egusphere-2024-2686, https://doi.org/10.5194/egusphere-2024-2686, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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Nitrogen dioxide is an air pollutant largely controlled by human activity that affects ozone, methane and aerosols. Satellite instruments can quantify column NO2, and by carefully matching the time and location of measurements, enable evaluation of model simulations. NO2 over SE Asia is assessed, showing that the model captures many features of the measurements, but also important differences that suggest model deficiencies in representing several aspects of the atmospheric chemistry of NO2.
05 Sep 2024
Opinion: The Impact of AerChemMIP on Climate and Air Quality Research
Paul T. Griffiths, Laura J. Wilcox, Robert J. Allen, Vaishali Naik, Fiona M. O'Connor, Michael J. Prather, Alexander T. Archibald, Florence Brown, Makoto Deushi, William Collins, Stephanie Fiedler, Naga Oshima, Lee T. Murray, Christopher J. Smith, Steven T. Turnock, Duncan Watson-Parris, and Paul J. Young
EGUsphere, https://doi.org/10.5194/egusphere-2024-2528, https://doi.org/10.5194/egusphere-2024-2528, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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The Aerosol Chemistry Model Intercomparison Project (AerChemMIP) aimed to quantify the climate and air quality impacts of aerosols and chemically reactive gases. In this paper, we review its contribution to AR6, and the wider understanding of the role of these species in climate and climate change. We identify remaining challenges concluding with recommendations aimed to improve the utility and uptake of climate model data to address the role of short-lived climate forcers in the Earth system.
04 Sep 2024
Hygroscopic Aerosols Amplify Longwave Downward Radiation in the Arctic
Denghui Ji, Mathias Palm, Matthias Buschmann, Kerstin Ebell, Marion Maturilli, Xiaoyu Sun, and Justus Notholt
EGUsphere, https://doi.org/10.5194/egusphere-2024-2241, https://doi.org/10.5194/egusphere-2024-2241, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Our study explores how certain aerosols, like sea salt, affect infrared heat radiation in the Arctic, potentially speeding up warming. We used advanced technology to measure aerosol composition and found that these particles grow with humidity, significantly increasing their heat-trapping effect in the infrared region, especially in winter. Our findings suggest these aerosols could be a key factor in Arctic warming, emphasizing the importance of understanding aerosols for climate prediction.
03 Sep 2024
The importance of burning conditions on the composition of domestic biomass burning organic aerosol and the impact of atmospheric aging
Rhianna Louise Evans, Daniel Jack Bryant, Aristeidis Voliotis, Dawei Hu, Huihui Wu, Sara Aisyah Syafira, Osayomwanbor Ebenezer Oghama, Gordon McFiggans, Jacqueline Fiona Hamilton, and Andrew Robert Rickard
EGUsphere, https://doi.org/10.5194/egusphere-2024-2642, https://doi.org/10.5194/egusphere-2024-2642, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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The chemical composition of organic aerosol derived from wood burning emissions under different burning conditions was characterised. Fresh emissions from flaming and smouldering were largely aromatic in nature whereas upon aging the aromatic content decreased. This decrease was greater for smouldering due to the loss of toxic polyaromatic species. Whereas under flaming conditions highly toxic polyaromatic species were produced. These differences present an important challenge for policy.
03 Sep 2024
A Data-Efficient Deep Transfer Learning Framework for Methane Super-Emitter Detection in Oil and Gas Fields Using Sentinel-2 Satellite
Shutao Zhao, Yuzhong Zhang, Shuang Zhao, Xinlu Wang, and Daniel J. Varon
EGUsphere, https://doi.org/10.5194/egusphere-2024-2565, https://doi.org/10.5194/egusphere-2024-2565, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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We target at the challenge of detecting methane super-emitters in oil and gas fields, which is critical for mitigating climate change. Traditional satellite-based detectors struggle due to interference from complex surfaces. We developed a novel method using deep-transfer-learning that improves detection efficiency and accuracy by reducing artifacts and adapting methane knowledge to different regions. Application revealed significant methane emissions, demonstrating the potential of our method.
03 Sep 2024
Observational Constraints Suggest a Smaller Effective Radiative Forcing from Aerosol-Cloud Interactions
Chanyoung Park, Brian J. Soden, Ryan J. Kramer, Tristan S. L’Ecuyer, and Haozhe He
EGUsphere, https://doi.org/10.5194/egusphere-2024-2547, https://doi.org/10.5194/egusphere-2024-2547, 2024
Preprint under review for ACP (discussion: final response, 9 comments)
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This study addresses the challenge of quantifying the impact of aerosol-cloud interactions. By analyzing satellite data and reanalysis, we examine cloud responses to aerosols by incorporating aerosol-to-cloud droplet activation rates. Our "perfect-model" validation reveals a smaller, less uncertain impact of aerosol-cloud interactions than previously estimated. This breakthrough suggests a reduced role of aerosol-cloud interactions in determining climate sensitivity.
02 Sep 2024
Investigating ice formation pathways using a novel two-moment multi-class cloud microphysics scheme
Tim Lüttmer, Peter Spichtinger, and Axel Seifert
EGUsphere, https://doi.org/10.5194/egusphere-2024-2157, https://doi.org/10.5194/egusphere-2024-2157, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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We investigate ice formation pathways in idealized convective clouds using a novel microphysics scheme, that distinguishes between five ice classes each with their unique formation mechanism. Ice crystals from rime splintering forms the lowermost layer of ice crystals around the updraft core. The majority of ice crystals in the anvil of the convective cloud stems from frozen droplets. Ice stemming from homogeneous and deposition nucleation was only relevant in the overshoot.
02 Sep 2024
Modelling of atmospheric variability of gas and aerosols during the ACROSS campaign 2022 in the greater Paris area: evaluation of the meteorology, dynamics and chemistry
Ludovico Di Antonio, Matthias Beekmann, Guillaume Siour, Vincent Michoud, Christopher Cantrell, Astrid Bauville, Antonin Bergé, Mathieu Cazaunau, Servanne Chevaillier, Manuela Cirtog, Joel F. de Brito, Paola Formenti, Cecile Gaimoz, Olivier Garret, Aline Gratien, Valérie Gros, Martial Haeffelin, Lelia N. Hawkins, Simone Kotthaus, Gael Noyalet, Diana Pereira, Jean-Eudes Petit, Eva Drew Pronovost, Véronique Riffault, Chenjie Yu, Gilles Foret, Jean-François Doussin, and Claudia Di Biagio
EGUsphere, https://doi.org/10.5194/egusphere-2024-2175, https://doi.org/10.5194/egusphere-2024-2175, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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Summer 2022 has been considered a proxy for future climate scenarios, given the registered hot and dry conditions. In this paper, we used the measurements from the ACROSS campaign, occurred over the Paris area in June–July 2022, in addition to observations from existing networks, to evaluate the WRF–CHIMERE model simulation over France and the Ile-de-France regions. Results over the Ile–de–France show to be satisfactory, allowing to explain the gas and aerosol variability at the ACROSS sites.
02 Sep 2024
Recommendations on benchmarks for chemical transport model applications in China – Part 2: Ozone and Uncertainty Analysis
Ling Huang, Xinxin Zhang, Chris Emery, Qing Mu, Greg Yarwood, Hehe Zhai, Zhixu Sun, Shuhui Xue, Yangjun Wang, Joshua S. Fu, and Li Li
EGUsphere, https://doi.org/10.5194/egusphere-2024-2199, https://doi.org/10.5194/egusphere-2024-2199, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Serious air pollution problems have occurred in many regions of China for the past decade and chemical transport models (CTMs) are being applied more frequently to address diverse scientific and regulatory compliance associated with deteriorated air quality in China. We provided benchmarks for model performance evaluation of CTM applications in China to demonstrate model robustness.
30 Aug 2024
Constraining Aerosol-Cloud Adjustments by Uniting Surface Observations with a Perturbed Parameter Ensemble
August Mikkelsen, Daniel T. McCoy, Trude Eidhammer, Andrew Gettelman, Ci Song, Hamish Gordon, and Isabel L. McCoy
EGUsphere, https://doi.org/10.5194/egusphere-2024-2158, https://doi.org/10.5194/egusphere-2024-2158, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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The largest uncertainty in inferring the magnitude of future warming comes from ambiguity in the strength of cooling in the historical record from aerosols. Aerosols are small liquid and solid particles that are important for cloud formation. The interactions between aerosols and clouds are complex and difficult to observe. In this study, we use surface observations of cloud and precipitation properties to constrain a climate model and interpret causality in complex aerosol-cloud interactions.
29 Aug 2024
The Critical Number and Size of Precipitation Embryos to Accelerate Warm Rain Initiation
Jung-Sub Lim, Yign Noh, Hyunho Lee, and Fabian Hoffmann
EGUsphere, https://doi.org/10.5194/egusphere-2024-2636, https://doi.org/10.5194/egusphere-2024-2636, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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The onset of rain is not fully understood. In this study, we address the impact of comparably large particles (precipitation embryos), speculated to initiate rain in clouds that do not contain ice. We showed that these particles can accelerate rain initiation only if their size and number exceed a threshold. As this threshold depends on the cloud's micro- and macrostructure, the impact of large particles on rain initiation is situation-dependent.
28 Aug 2024
Observed impacts of aerosol concentration on maritime tropical convection within constrained environments using airborne radiometer, radar, lidar, and dropsondes
Corey G. Amiot, Timothy J. Lang, Susan C. van den Heever, Richard A. Ferrare, Ousmane O. Sy, Lawrence D. Carey, Sundar A. Christopher, John R. Mecikalski, Sean W. Freeman, George Alexander Sokolowsky, Chris A. Hostetler, and Simone Tanelli
EGUsphere, https://doi.org/10.5194/egusphere-2024-2384, https://doi.org/10.5194/egusphere-2024-2384, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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Decoupling aerosol and environmental impacts on convection is challenging. Using airborne data, we correlated microwave-frequency convective metrics with aerosol concentrations in several different environments. Medium-to-high aerosol concentrations were often strongly and positively correlated with convective intensity and frequency, especially in favorable environments based on temperature lapse rates and K-Index. Storm environment is important to consider when evaluating aerosol effects.
27 Aug 2024
Invisible aerosol layers: improved lidar detection capabilities by means of laser-induced aerosol fluorescence
Benedikt Gast, Cristofer Jimenez, Albert Ansmann, Moritz Haarig, Ronny Engelmann, Felix Fritzsch, Athena Augusta Floutsi, Hannes Griesche, Kevin Ohneiser, Julian Hofer, Martin Radenz, Holger Baars, Patric Seifert, and Ulla Wandinger
EGUsphere, https://doi.org/10.5194/egusphere-2024-2586, https://doi.org/10.5194/egusphere-2024-2586, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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In this study, we discuss the enhanced detection capabilities of a fluorescence lidar in the case of optically thin aerosol layers in the upper troposphere and lower stratosphere (UTLS) region. Our results suggest that such thin aerosol layers are not so rare in the UTLS and can potentially trigger and impact cirrus cloud formation through heterogeneous ice nucleation. By altering the microphysical cloud properties, this could affect cloud evolution and lifetime, and thus their climate effect.
27 Aug 2024
Measurement Report: Diurnal Variability of NO2 and HCHO Lower Tropospheric Vertical Profiles in Southeastern Los Angeles
Peter Peterson, Lisa Hernandez, Leslie Tanaka, and Alejandro Dunnick
EGUsphere, https://doi.org/10.5194/egusphere-2024-1460, https://doi.org/10.5194/egusphere-2024-1460, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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This work uses spectroscopy to examine the vertical distribution of nitrogen dioxide and formaldehyde in southeastern Los Angeles, USA, a region heavily impacted by ozone pollution. We examine how both the amount and vertical profile of the two species varies throughout the day, finding that differences between the two species impact the utilization of satellite-based measurements to diagnose ozone production chemistry and these impacts are variable depending on the time of day.
26 Aug 2024
Multi-observational estimation of regional and sectoral emission contributions to the persistent high growth rate of atmospheric CH4 for 2020–2022
Yosuke Niwa, Yasunori Tohjima, Yukio Terao, Tazu Saeki, Akihiko Ito, Taku Umezawa, Kyohei Yamada, Motoki Sasakawa, Toshinobu Machida, Shin-Ichiro Nakaoka, Hideki Nara, Hiroshi Tanimoto, Hitoshi Mukai, Yukio Yoshida, Shinji Morimoto, Shinya Takatsuji, Kazuhiro Tsuboi, Yousuke Sawa, Hidekazu Matsueda, Kentaro Ishijima, Ryo Fujita, Daisuke Goto, Xin Lan, Kenneth Schuldt, Michal Heliasz, Tobias Biermann, Lukasz Chmura, Jarsolaw Necki, and Irène Xueref-Remy
EGUsphere, https://doi.org/10.5194/egusphere-2024-2457, https://doi.org/10.5194/egusphere-2024-2457, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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This study estimated regional and sectoral emission contributions to the unprecedented surge of atmospheric methane for 2020–2022. The methane is the second most important greenhouse gas and its emissions reduction is urgently required to mitigate the global warming. Numerical modeling-based estimates with three different sets of atmospheric observations consistently suggested large contributions of biogenic emissions from South Asia and Southeast Asia to the surge of atmospheric methane.
26 Aug 2024
Cirrus formation regimes – Data driven identification and quantification of mineral dust effect
Kai Jeggle, David Neubauer, Hanin Binder, and Ulrike Lohmann
EGUsphere, https://doi.org/10.5194/egusphere-2024-2559, https://doi.org/10.5194/egusphere-2024-2559, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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This work uncovers the formation regimes of cirrus clouds and how dust particles influence their properties. By applying machine learning to a combination of satellite and reanalysis data, cirrus clouds are classified into different formation regimes. Depending on the regime, increasing dust aerosol concentrations can either decrease or increase the number of ice crystals. This challenges the idea of using cloud seeding to cool the planet, as it may unintentionally lead to warming instead.
23 Aug 2024
Source apportionment and ecotoxicity of particulate pollution events in a Major Southern Hemisphere Megacity: influence of biomass burning and a biofuel impacted fleet
Guilherme Martins Pereira, Leonardo Yoshiaki Kamigauti, Rubens Fabio Pereira, Djacinto Monteiro dos Santos, Thayná da Silva Santos, José Vinicius Martins, Célia Alves, Cátia Gonçalves, Ismael Casotti Rienda, Nora Kováts, Thiago Nogueira, Luciana Rizzo, Paulo Artaxo, Regina Maura de Miranda, Marcia Akemi Yamasoe, Edmilson Dias de Freitas, Pérola de Castro Vasconcellos, and Maria de Fatima Andrade
EGUsphere, https://doi.org/10.5194/egusphere-2024-2212, https://doi.org/10.5194/egusphere-2024-2212, 2024
Revised manuscript accepted for ACP (discussion: final response, 5 comments)
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The chemical composition of fine particulate matter was studied in the megacity of São Paulo (Brazil) during a polluted period. Vehicular-related sources were dominant; however, a high contribution of biomass burning was observed and correlated with sample ecotoxicity. Emerging biomass burning sources, such as forest fires and sugarcane bagasse-based power plants, highlight the need for additional control measures alongside stricter rules concerning vehicular emissions.
22 Aug 2024
Long-term trends in aerosol properties derived from AERONET measurements
Zhenyu Zhang, Jing Li, Huizheng Che, Yueming Dong, Oleg Dubovik, Thomas Eck, Pawan Gupta, Brent Holben, Jhoon Kim, Elena Lind, Trailokya Saud, Sachchida Nand Tripathi, and Tong Ying
EGUsphere, https://doi.org/10.5194/egusphere-2024-2533, https://doi.org/10.5194/egusphere-2024-2533, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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We used ground-based remote sensing data from the Aerosol Robotic Network to examine long-term trends in aerosol characteristics. We found aerosol loadings generally decreased globally, and aerosols became more scattering. These changes are closely related to variations in aerosol compositions, such as decreased anthropogenic emissions over East Asia, Europe, and North America, increased anthropogenic source over North India, increased dust activities over the Arabian Peninsula, etc.
20 Aug 2024
Air Pollution in The Upper Troposphere: Insights from In-Situ Airplane Measurements (1991–2018)
Kuo-Ying Wang, Philippe Nedelec, Valerie Thouret, Hannah Clark, Andreas Wahner, and Andreas Petzold
EGUsphere, https://doi.org/10.5194/egusphere-2024-2414, https://doi.org/10.5194/egusphere-2024-2414, 2024
Revised manuscript under review for ACP (discussion: final response, 12 comments)
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We use routine in-service commercial passenger airplanes Airbus A340 and A330 to collect air pollutants in the upper troposphere. The beauty in using commercial airplanes is that these commercial airplanes, like taxi on the ground, keep flying all the time. We find that short-lived air pollutants are very sensitive to ground-level emissions. Effective regulation in ground-level emissions can help to reduce air pollution in the upper troposphere.
20 Aug 2024
Mechanisms of surface solar irradiance variability under broken clouds
Wouter Mol and Chiel van Heerwaarden
EGUsphere, https://doi.org/10.5194/egusphere-2024-2396, https://doi.org/10.5194/egusphere-2024-2396, 2024
Revised manuscript accepted for ACP (discussion: final response, 5 comments)
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Sunlight varies often and quickly under broken cloud cover, and every cloud field creates a unique pattern of sunlight on the surface below. These variations affect many processes in the Earth system, from photosynthesis and chemistry, to cloud formation itself. The exact way in which cloud particles interact with sunlight is complex and expensive to calculate. We demonstrate a simplified framework which explains how sunlight changes for potentially any cloud field.
20 Aug 2024
Evidence of an Ozone Mini-Hole Structure in the Early Hunga Plume Above the Indian Ocean
Tristan Millet, Hassan Bencherif, Thierry Portafaix, Nelson Bègue, Alexandre Baron, Valentin Duflot, Cathy Clerbaux, Pierre-François Coheur, Andrea Pazmino, Michaël Sicard, Jean-Marc Metzger, Guillaume Payen, Nicolas Marquestaut, and Sophie Godin-Beekmann
EGUsphere, https://doi.org/10.5194/egusphere-2024-2350, https://doi.org/10.5194/egusphere-2024-2350, 2024
Revised manuscript under review for ACP (discussion: final response, 6 comments)
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On 15 January 2022, the Hunga volcano erupted, releasing aerosols, sulfur dioxide, and water vapor into the stratosphere, impacting ozone levels over the Indian Ocean. MLS and IASI data show that the volcanic plume decreased ozone levels within the stratospheric ozone layer, shaping a structure similar to an ozone mini-hole. A stable stratosphere, free of dynamical barriers, enabled the volcanic plume's transport over the Indian Ocean.
20 Aug 2024
Variations in Turbulence Characteristics of Head Fires Induced by Background Wind and Fuel Loading Levels
Chuanying Lin, Xingdong Li, Hongyang Zhao, and Dandan Li
EGUsphere, https://doi.org/10.5194/egusphere-2024-2252, https://doi.org/10.5194/egusphere-2024-2252, 2024
Preprint under review for ACP (discussion: final response, 5 comments)
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The temporal characteristics mainly refer to the differences between the periods before, during, and after the fire, whereas the spatial characteristics primarily denote the trend of turbulence characteristics with respect to the distance from the ignition boundary during the combustion period.
19 Aug 2024
Water Vapor Transport and its Influence on Water Stable Isotope in Dongting Lake Basin
Xiong Xiao, Xinping Zhang, Zhuoyong Xiao, Zhongli Liu, Dizhou Wang, Cicheng Zhang, Zhiguo Rao, Xinguang He, and Huade Guan
EGUsphere, https://doi.org/10.5194/egusphere-2024-2215, https://doi.org/10.5194/egusphere-2024-2215, 2024
Revised manuscript accepted for ACP (discussion: final response, 10 comments)
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Our study reveals how water vapor, directed by seasonal winds, shapes precipitation isotopes in China's Dongting Lake Basin. We traced water vapor paths, showing their impact on water supply and climate. This insight is key for predicting future water resources and climate patterns, offering a clearer understanding of our interconnected environmental systems.
16 Aug 2024
Water vapour isotopes over West Africa as observed from space: which processes control tropospheric H2O/HDO pair distributions?
Christopher Johannes Diekmann, Matthias Schneider, Peter Knippertz, Tim Trent, Hartmut Boesch, Amelie Ninja Roehling, John Worden, Benjamin Ertl, Farahnaz Khosrawi, and Frank Hase
EGUsphere, https://doi.org/10.5194/egusphere-2024-1613, https://doi.org/10.5194/egusphere-2024-1613, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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The West African Monsoon is the main source of rainfall over West Africa, and understanding the development of the monsoon remains challenging due to complex interactions of atmospheric processes. We make use of new satellite datasets of isotopes in tropospheric water vapour to bring new insights into processes controlling the monsoon convection. We find that comparing different water vapour isotopes reveals effects of rain-vapour interactions and air mass transport.
15 Aug 2024
Responses of polar energy budget to regional SST changes in extra-polar regions
Qingmin Wang, Yincheng Liu, Lujun Zhang, and Chen Zhou
EGUsphere, https://doi.org/10.5194/egusphere-2024-2379, https://doi.org/10.5194/egusphere-2024-2379, 2024
Revised manuscript accepted for ACP (discussion: final response, 7 comments)
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Our research explores how SST changes in non-polar regions impact the polar energy budget. Through idealized SST experiments, we found that warming in tropical and midlatitude oceans raises polar temperatures via enhanced atmospheric energy transport, leading to surface warming and top-of-atmosphere cooling in polar areas. This study highlights the distinct impacts of tropical Pacific and Indian Ocean SST changes on Arctic and Antarctic climates.
14 Aug 2024
Causal Analysis of Aerosol Impacts on Isolated Deep Convection: Findings from TRACER
Dié Wang, Roni Kobrosly, Tao Zhang, Tamanna Subba, Susan van den Heever, Siddhant Gupta, and Michael Jensen
EGUsphere, https://doi.org/10.5194/egusphere-2024-2436, https://doi.org/10.5194/egusphere-2024-2436, 2024
Preprint under review for ACP (discussion: final response, 4 comments)
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We use a new method to understand how tiny particles in the air, called aerosols, affect rain clouds in the Houston-Galveston area. Aerosols generally do not make these clouds grow much taller, with an average height increase of about 1 km under certain conditions. However, their effects on rainfall strength and cloud expansion are less certain. Clouds influenced by sea breezes show a stronger aerosol impact, possibly due to unaccounted factors like vertical winds in near-surface layers.
14 Aug 2024
Phase matrix characterization of long-range transported Saharan dust using multiwavelength polarized polar imaging nephelometry
Elena Bazo, Daniel Perez-Ramirez, Antonio Valenzuela, Vanderlei Martins, Gloria Titos, Alberto Cazorla, Fernando Rejano, Diego Patrón, Arlett Diaz-Zurita, Francisco Jose Garcia-Izquierdo, David Fuertes, Lucas Alados-Arboledas, and Francisco Jose Olmo
EGUsphere, https://doi.org/10.5194/egusphere-2024-2080, https://doi.org/10.5194/egusphere-2024-2080, 2024
Revised manuscript accepted for ACP (discussion: final response, 8 comments)
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This works analyses aerosol scattering phase function for transported Saharan dust to the city of Granada – located in southwestern Europe. We use the novel technique polar imaging nephelometry that helps to determine the phase functions using a CCD camara. The capability of measuring with polarized light helps to inferr new properties about the mixture of Saharan dust particles with other of anthropogenic origin.
12 Aug 2024
Impact on the stratocumulus-to-cumulus transition of the interaction of cloud microphysics and macrophysics with large-scale circulation
Je-Yun Chun, Robert Wood, Peter N. Blossey, and Sarah J. Doherty
EGUsphere, https://doi.org/10.5194/egusphere-2024-2439, https://doi.org/10.5194/egusphere-2024-2439, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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This study explores how aerosols affect clouds transitioning from stratocumulus to cumulus along trade winds under varying atmospheric conditions. We found that aerosols typically reduce precipitation and raise cloud height, but their impact changes when subsidence changes by aerosol enhancement are considered. Our findings indicate that the cooling effect of aerosols might be overestimated if these atmospheric changes are not accounted for.
12 Aug 2024
Water Vapor climatologies in the extra-tropical Upper Troposphere and Lower Stratosphere derived from a Synthesis of Passenger and Research Aircraft Measurements
Patrick Konjari, Christian Rolf, Michaela Imelda Hegglin, Susanne Rohs, Yun Li, Andreas Zahn, Harald Bönisch, Martina Krämer, and Andreas Petzold
EGUsphere, https://doi.org/10.5194/egusphere-2024-2360, https://doi.org/10.5194/egusphere-2024-2360, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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This study introduces a new method to deriving adjusted water vapor (H2O) climatologies for the upper tropopshere and lower statosphere (UT/LS) using data from 60,000 flights under the IAGOS program. Biases in the IAGOS water vapor dataset are adjusted, based on the more accurate IAGOS-CARIBIC data. The resulting highly resolved H2O climatologies will contribute to a better understanding of the H2O variability in the UT/LS and its connection to various transport and mixing processes.
09 Aug 2024
Modeling simulation of aerosol light absorption over the Beijing-Tianjin-Hebei region: the impact of mixing state and aging processes
Huiyun Du, Jie Li, Xueshun Chen, Gabriele Curci, Fangqun Yu, Yele Sun, Xu Dao, Song Guo, Zhe Wang, Wenyi Yang, Lianfang Wei, and Zifa Wang
EGUsphere, https://doi.org/10.5194/egusphere-2024-1432, https://doi.org/10.5194/egusphere-2024-1432, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Inadequate consideration of mixing state and coatings on BC hinders aerosol radiation forcing quantification. While core-shell mixing results match observations closely, partial internal mixing and coating are more realistic. The fraction of embedded BC and coating aerosols resolved by a microphysics module were used to constrain the mixing state. This led to a 30~43 % absorption enhancement decrease over Northern China, offering valuable insights for the assessment of BC's radiative effects.
09 Aug 2024
Urban Area Observing System (UAOS) Simulation Experiment Using DQ-1 Total Column Concentration Observations
Jinchun Yi, Yiyang Huang, Zhipeng Pei, and Ge Han
EGUsphere, https://doi.org/10.5194/egusphere-2024-2495, https://doi.org/10.5194/egusphere-2024-2495, 2024
Preprint under review for ACP (discussion: open, 2 comments)
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The ODIAC inventory overestimated emissions in Beijing and Riyadh by 10–20 % and underestimated emissions in Cairo by 10–30 %. The biosphere flux has a 20–40 % impact on emissions in Beijing during certain periods. Moreover, using night-time and day-time biosphere flux data separately can improve the simulation accuracy of the same orbit by 20–70 % compared to using daily average data.
09 Aug 2024
State-wide California 2020 Carbon Dioxide Budget Estimated with OCO-2 and OCO-3 satellite data
Matthew S. Johnson, Sofia D. Hamilton, Seongeun Jeong, Yuyan Cui, Dien Wu, Alex Turner, and Marc Fischer
EGUsphere, https://doi.org/10.5194/egusphere-2024-2152, https://doi.org/10.5194/egusphere-2024-2152, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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Satellites, such as NASA’s Orbiting Carbon Observatory-2 and -3 (OCO-2/3), retrieve carbon dioxide (CO2) concentrations which provide vital information for estimating surface CO2 emissions. Here we investigate the ability of OCO-2/3 retrievals to constrain CO2 emissions for the state of California for the major emission sectors (i.e., fossil fuels, net ecosystem exchange, wildfire).
08 Aug 2024
Determination of the Atmospheric Volatility of Pesticides using Chemical Ionisation Mass Spectrometry
Olivia Mae Jackson, Aristeidis Voliotis, Thomas J. Bannan, Simon P. O'Meara, Gordon McFiggans, Dave Johnson, and Hugh Coe
EGUsphere, https://doi.org/10.5194/egusphere-2024-2380, https://doi.org/10.5194/egusphere-2024-2380, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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The paper details a method of measuring volatility of pesticides using chemical ionisation mass spectrometry (CIMS) to calculate vapour pressure. This was then compared to current literature values and commonly used models. The exact nature of the literature values often remain uncertain due to being hidden in industrial reports. The results show that the method used primarily matches current literature values and any difference can be explained by method differences either in the methodology.
06 Aug 2024
Isomer Molecular Structures and Formation Pathways of Oxygenated Organic Molecules in Newly Formed Biogenic Particles
Vignesh Vasudevan-Geetha, Lee Tiszenkel, Zhizhao Wang, Robin Russo, Daniel Bryant, Julia Lee-Taylor, Kelley Barsanti, and Shan-Hu Lee
EGUsphere, https://doi.org/10.5194/egusphere-2024-2454, https://doi.org/10.5194/egusphere-2024-2454, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Our laboratory experiments using two high-resolution mass spectrometers show that these OOMs can also form within the particle phase, in addition to gas-to-particle conversion processes. Our results demonstrate that particle-phase formation processes can contribute to the formation and growth of new particles in biogenic environments.
05 Aug 2024
Warm-phase Microphysical Evolution in Large Eddy Simulations of Tropical Cumulus Congestus: Constraining Drop Size Distribution Evolution using Polarimetery Retrievals and a Thermal-Based Framework
McKenna Stanford, Ann Fridlind, Andrew Ackerman, Bastiaan van Diedenhoven, Qian Xiao, Jian Wang, Toshihisa Matsui, Daniel Hernandez-Deckers, and Paul Lawson
EGUsphere, https://doi.org/10.5194/egusphere-2024-2413, https://doi.org/10.5194/egusphere-2024-2413, 2024
Revised manuscript under review for ACP (discussion: final response, 3 comments)
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The evolution of cloud droplets, from the point they are activated by atmospheric aerosol to the formation of precipitation, is an important process relevant to understanding cloud-climate feedbacks. This study demonstrates a benchmark framework for using novel airborne measurements and retrievals to constrain high-resolution simulations of moderately deep cumulus clouds and pathways for scaling results to large-scale models and space-based observational platforms.
05 Aug 2024
A-year Continuous Observations of Near-Surface Atmospheric Water Vapor Stable Isotopes at Matara, Sri Lanka
Yuqing Wu, Jing Gao, Aibin Zhao, Xiaowei Niu, Yigang Liu, Disna Ratnasekera, Tilak Priyadarshana Gamage, and Amarasinghe Hewage Ruwan Samantha
EGUsphere, https://doi.org/10.5194/egusphere-2024-1840, https://doi.org/10.5194/egusphere-2024-1840, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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This study monitored atmospheric water vapor isotopes for a year at Matara, Sri Lanka. It found clear seasonal variations in δ18O, δD, and d-excess. There showed depleted δ18O during the southwest monsoon, while had enriched δ18O and higher d-excess during the northeast monsoon. Sea surface condition and regional convective activity significantly influenced the isotopic compositions, improving understanding of monsoon and local meteorological condition impacts on tropical water vapor.
02 Aug 2024
Impacts of irrigation on ozone and fine particulate matter (PM2.5) air quality: Implications for emission control strategies for intensively irrigated regions in China
Tiangang Yuan, Amos P. K. Tai, Tzung-May Fu, Aoxing Zhang, David H. Y. Yung, Jin Wu, and Sien Li
EGUsphere, https://doi.org/10.5194/egusphere-2024-1557, https://doi.org/10.5194/egusphere-2024-1557, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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This study utilizes a regional climate-air quality coupled model to first investigate the complex interaction between irrigation, climate, and air quality in China. We found that large-scale irrigation practices reducing summertime surface ozone while raising second inorganic aerosol concentration via complicated physical and chemical processes. Our results emphasize the importance to make a tradeoff between air pollution control and sustainable agricultural development.
01 Aug 2024
How the representation of microphysical processes affects tropical condensate in a global storm-resolving model
Ann Kristin Naumann, Monika Esch, and Bjorn Stevens
EGUsphere, https://doi.org/10.5194/egusphere-2024-2268, https://doi.org/10.5194/egusphere-2024-2268, 2024
Revised manuscript accepted for ACP (discussion: final response, 5 comments)
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This study explores how uncertainties in the representation of microphysical processes affect the tropical condensate distribution in the global storm-resolving model ICON. The results point to the importance of the fall speed of hydrometeor particles and to a simple relationship: the faster a condensate falls, the less there is of it. Implications for the energy balance and precipitation properties are discussed.
30 Jul 2024
Estimation of the radiation budget during MOSAiC based on ground-based and satellite remote sensing observations
Carola Barrientos-Velasco, Christopher J. Cox, Hartwig Deneke, J. Brant Dodson, Anja Hünerbein, Matthew D. Shupe, Patrick C. Taylor, and Andreas Macke
EGUsphere, https://doi.org/10.5194/egusphere-2024-2193, https://doi.org/10.5194/egusphere-2024-2193, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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Understanding how clouds affect the climate, especially in the Arctic, is crucial. This study used data from the largest polar expedition in history, MOSAiC, and the CERES satellite to analyse the impact of clouds on radiation. Simulations showed accurate results, aligning with observations. Over the year, clouds caused the atmospheric-surface system to lose 5.2 W/m² of radiative energy to space, while the surface gained 25 W/m², and the atmosphere cooled by 30.2 W/m².
29 Jul 2024
Thermospheric nitric oxide NO during solar minimum modulated by O/O2 ratio and thermospheric transport and mixing
Miriam Sinnhuber, Christina Arras, Stefan Bender, Bernd Funke, Hanli Liu, Daniel R. Marsh, Thomas Reddmann, Eugene Rozanov, Timofei Sukhodolov, Monika E. Szelag, and Jan Maik Wissing
EGUsphere, https://doi.org/10.5194/egusphere-2024-2256, https://doi.org/10.5194/egusphere-2024-2256, 2024
Preprint under review for ACP (discussion: final response, 2 comments)
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Formation of nitric oxide NO in the upper atmosphere varies with solar activity. Observations show that it starts a chain of processes in the entire atmosphere affecting the ozone layer and climate system. This is often underestimated in models. We compare five models which show large differences in simulated NO. Analysis of results point out problems related to the oxygen balance, and to the impact of atmospheric waves on dynamics. Both must be modeled well to reproduce the downward coupling.
24 Jul 2024
Size-resolved process understanding of stratospheric sulfate aerosol following the Pinatubo eruption
Allen Hu, Xiaohong Liu, Ziming Ke, Benjamin Wagman, Hunter Brown, Zheng Lu, Diana Bull, and Kara Peterson
EGUsphere, https://doi.org/10.5194/egusphere-2024-2227, https://doi.org/10.5194/egusphere-2024-2227, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Volcanic eruptions have a major effect on temperature throughout the atmosphere and can be studied as a proxy for geo-engineering. The aerosol module in the Energy Exascale Earth System Model (E3SM) was originally intended for simulation of tropospheric aerosols and has problems handling stratospheric sulfate aerosols due to volcanic eruptions. We have made alterations to the aerosol module to overcome these problems, with simulation results more closely reproducing observations.
24 Jul 2024
Formation drivers and photochemical effects of ClNO2 in a coastal city of Southeast China
Gaojie Chen, Xiaolong Fan, Haichao Wang, Yee Jun Tham, Ziyi Lin, Xiaoting Ji, Lingling Xu, Baoye Hu, and Jinsheng Chen
EGUsphere, https://doi.org/10.5194/egusphere-2024-1638, https://doi.org/10.5194/egusphere-2024-1638, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Our study revealed that the nighttime heterogeneous N2O5 uptake process was the major contributor of ClNO2 sources, while nitrate photolysis promoted the elevation of daytime ClNO2 concentrations. The rates of alkane oxidation by Cl radical in the early morning exceeded those by OH radical, significantly promoted the formation of ROx and O3, further enhanced the atmospheric oxidation capacity levels.
23 Jul 2024
Multi-model assessment of climatologies in the upper troposphere–lower stratosphere using the IAGOS data
Yann Cohen, Didier Hauglustaine, Nicolas Bellouin, Marianne Tronstad Lund, Sigrun Matthes, Agnieszka Skowron, Robin Thor, Ulrich Bundke, Andreas Petzold, Susanne Rohs, Valérie Thouret, Andreas Zahn, and Helmut Ziereis
EGUsphere, https://doi.org/10.5194/egusphere-2024-2208, https://doi.org/10.5194/egusphere-2024-2208, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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The chemical composition of the atmosphere near the tropopause is a key parameter for evaluating the climate impact of subsonic aviation pollutants. This study uses in-situ data on board passenger aircraft to assess the ability of 5 chemistry-climate models to reproduce (bi-)decadal climatologies in ozone, carbon monoxide, water vapour, and reactive nitrogen in this region. The models reproduce well the very distinct ozone seasonality in the upper troposphere and in the lower stratosphere.
22 Jul 2024
Age of air from ACE-FTS measurements of sulfur hexafluoride
Laura N. Saunders, Kaley A. Walker, Gabriele P. Stiller, Thomas von Clarmann, Florian Haenel, Hella Garny, Harald Bönisch, Chris D. Boone, Ariana E. Castillo, Andreas Engel, Johannes C. Laube, Marianna Linz, Felix Ploeger, David A. Plummer, Eric A. Ray, and Patrick E. Sheese
EGUsphere, https://doi.org/10.5194/egusphere-2024-2117, https://doi.org/10.5194/egusphere-2024-2117, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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We present a 17-year stratospheric age of air dataset derived from ACE-FTS satellite measurements of sulfur hexafluoride. This is the longest continuous, global, and vertically resolved age of air time series available to date. In this paper, we show that this dataset agrees well with age of air datasets based on measurements from other instruments. We also present trends in the midlatitude lower stratosphere that indicate changes in the global circulation that are predicted by climate models.
22 Jul 2024
New Particle Formation Events Observed during the COALA-2020 Campaign
Jhonathan Ramirez-Gamboa, Clare Paton-Walsh, Melita Keywood, Ruhi Humphries, Asher Mouat, Jennifer Kaiser, Malcom Possell, Jack Simmons, and Travis Naylor
EGUsphere, https://doi.org/10.5194/egusphere-2024-2062, https://doi.org/10.5194/egusphere-2024-2062, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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Tiny air particles (aerosols) influence clouds, sunlight, and air chemistry. Our study examined how these particles form in a plant-rich region of Southeast Australia. We found frequent new particle formation (NPF) events, often linked to pollution plumes. VOCs from plants and other factors like humidity influence NPF and aerosol growth. Nighttime NPF requires further study. Overall, plant emissions play a key role in aerosol formation in this region.
15 Jul 2024
An Investigation of the Impact of Canadian wildfires on US Air Quality using Satellite, Model and Ground Measurements
Zhixin Xue, Nair Udaysankar, and Sundar Christopher
EGUsphere, https://doi.org/10.5194/egusphere-2024-1781, https://doi.org/10.5194/egusphere-2024-1781, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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Canadian wildfires degrade US air quality through long-range smoke transport. This study uses surface, satellite, and numerical models to assess the PM2.5 increase due to Canadian fires during 2018 fire season. Satellite data, often limited by cloud cover, was supplemented with high-resolution simulated data to fill gaps. Weather systems significantly influenced smoke movement. Canadian fires led to a notable rise in PM2.5 levels across various US regions during the 2018 summer wildfire events.
15 Jul 2024
Combined CO2 measurement record indicates decreased Amazon forest carbon uptake, offset by Savannah carbon release
Santiago Botía, Saqr Munassar, Thomas Koch, Danilo Custodio, Luana S. Basso, Shujiro Komiya, Jost V. Lavric, David Walter, Manuel Gloor, Giordane Martins, Stijn Naus, Gerbrand Koren, Ingrid Luijkx, Stijn Hantson, John B. Miller, Wouter Peters, Christian Rödenbeck, and Christoph Gerbig
EGUsphere, https://doi.org/10.5194/egusphere-2024-1735, https://doi.org/10.5194/egusphere-2024-1735, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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This study uses CO2 data from the Amazon Tall Tower Observatory and airborne profiles to estimate net carbon exchange. We found that the biogeographic Amazon is a net carbon sink, while the Cerrado and Caatinga biomes are net carbon sources, resulting in an overall neutral balance. To further reduce the uncertainty in our estimates we call for an expansion of the monitoring capacity, especially in the Amazon-Andes foothills.
09 Jul 2024
Weak surface temperature effects of recent reductions in shipping SO2 emissions, with quantification confounded by internal variability
Duncan Watson-Parris, Laura J. Wilcox, Camilla W. Stjern, Robert J. Allen, Geeta Persad, Massimo A. Bollasina, Annica M. L. Ekman, Carley E. Iles, Manoj Joshi, Marianne T. Lund, Daniel McCoy, Daniel Westervelt, Andrew Williams, and Bjørn H. Samset
EGUsphere, https://doi.org/10.5194/egusphere-2024-1946, https://doi.org/10.5194/egusphere-2024-1946, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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In 2020, regulations by the International Maritime Organization aimed to reduce aerosol emissions from ships. These aerosols previously had a cooling effect, which the regulations might reduce, revealing more greenhouse gas warming. Here we find that while there is regional warming, the global 2020–2040 temperature rise is only +0.03°C. This small change is difficult to distinguish from natural climate variability, indicating the regulations have had a limited effect on observed warming to date.
09 Jul 2024
Momentum flux characteristics of vertical propagating Gravity Waves
Prosper K. Nyassor, Cristiano M. Wrasse, Igo Paulino, Cosme A. O. B. Figueiredo, Ricardo A. Buriti, Hisao Takahashi, Delano Gobbi, and Gabriel A. Giongo
EGUsphere, https://doi.org/10.5194/egusphere-2024-1982, https://doi.org/10.5194/egusphere-2024-1982, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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This work studies the dynamics of momentum and energy of upward and downward GW. From photometer, the vertical component of GWs were observed and horizontal component from an all-sky imager. Using these parameters from these two instruments and wind from meteor radar, the momentum flux and energy of the waves were determined and studied. It was observed that the dynamics of the downward GWs is opposite to that of the upward GWs.
08 Jul 2024
Australian Bushfire Emissions Result in Enhanced Polar Stratospheric Ice Clouds
Srinivasan Prasanth, Narayana Sarma Anand, Kudilil Sunilkumar, Subin Jose, Kenath Arun, Sreedharan K. Satheesh, and Krishnaswamy K. Moorthy
EGUsphere, https://doi.org/10.5194/egusphere-2024-1849, https://doi.org/10.5194/egusphere-2024-1849, 2024
Revised manuscript under review for ACP (discussion: final response, 8 comments)
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We study the impact of the 2019/2020 Australian bushfires on stratospheric chemistry and polar stratospheric cloud (PSC) dynamics. During Austral winter 2020, 82% of liquid nitric acid trihydrate (LNAT) PSC nucleated on bushfire aerosols, and 77% of ice PSC formed on these LNAT. This rapid conversion mechanism of LNAT to ice resulted in high anomalous ice PSC. This study sheds light on interactions between bushfire aerosols, and PSC microphysics which has significant global climate implications.
05 Jul 2024
Impact of wildfire smoke on Arctic cirrus formation, part 2: simulation of MOSAiC 2019−2020 cases
Albert Ansmann, Cristofer Jimenez, Daniel A. Knopf, Johanna Roschke, Johannes Bühl, Kevin Ohneiser, and Ronny Engelmann
EGUsphere, https://doi.org/10.5194/egusphere-2024-2009, https://doi.org/10.5194/egusphere-2024-2009, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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In this study, we focus on the potential impact of wildfire smoke on cirrus formation. Aerosol and cirrus observations with lidar and radar during the MOSAiC expedition, presented in part 1 (egusphere-2024-2008) are closely linked to comprehensive modeling of ice nucleation in cirrus evolution processes, presented in this part 2 (egusphere-2024-2009). A clear impact of wildfire smoke on cirrus formation was found.
05 Jul 2024
Impact of wildfire smoke on Arctic cirrus formation, part 1: analysis of MOSAiC 2019–2020 observations
Albert Ansmann, Cristofer Jimenez, Johanna Roschke, Johannes Bühl, Kevin Ohneiser, Ronny Engelmann, Martin Radenz, Hannes Griesche, Julian Hofer, Dietrich Althausen, Daniel A. Knopf, Sandro Dahlke, Tom Gaudek, Patric Seifert, and Ulla Wandinger
EGUsphere, https://doi.org/10.5194/egusphere-2024-2008, https://doi.org/10.5194/egusphere-2024-2008, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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In this study, we focus on the potential impact of wildfire smoke on cirrus formation. For the first time, state-of-the-art aerosol and cirrus observations with lidar and radar, presented in part 1 of a series of two articles, are closely linked to comprehensive modeling of gravity-wave-induced ice nucleation in cirrus evolution processes, presented in part 2. We found a clear impact of wildfire smoke on cirrus evolution.
05 Jul 2024
How atmospheric CO2 can inform us on annual and decadal shifts in the biospheric carbon uptake period
Theertha Kariyathan, Ana Bastos, Markus Reichstein, Wouter Peters, and Julia Marshall
EGUsphere, https://doi.org/10.5194/egusphere-2024-1382, https://doi.org/10.5194/egusphere-2024-1382, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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The carbon uptake period (CUP) refers to the time of the year when there is net absorption of CO2 from the atmosphere to the land. Several studies have assessed changes in CUP based on seasonal metrics from CO2 mole fraction measurements to understand the response of terrestrial biosphere to climate variations. However, we find that the CUP derived from CO2 mole fraction measurements are not likely to provide an accurate magnitude of the actual changes occurring over the surface.
04 Jul 2024
Measurement report: TURBAN observation campaign combining street-level low-cost air quality sensors and meteorological profile measurements in Prague
Petra Bauerová, Josef Keder, Adriana Šindelářová, Ondřej Vlček, William Patiño, Jaroslav Resler, Pavel Krč, Jan Geletič, Hynek Řezníček, Martin Bureš, Kryštof Eben, Michal Belda, Jelena Radović, Vladimír Fuka, Radek Jareš, and Igor Ezau
EGUsphere, https://doi.org/10.5194/egusphere-2024-1222, https://doi.org/10.5194/egusphere-2024-1222, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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We implemented an observation campaign focused on street-level air quality and vertical meteorological profile measurement in Prague using low-cost sensors and remote sensing devices. Low-cost sensors have undergone long-term field testing, own data correction and drift evaluation procedures. A high level of NO2 pollution was confirmed due to the traffic load in streets, peaks of aerosol pollution appeared more under inversion conditions. The data will be further used for PALM model validation.
03 Jul 2024
Disentangling the chemistry and transport impacts of the Quasi-Biennial Oscillation on stratospheric ozone
Jinbo Xie, Qi Tang, Michael Prather, Jadwiga Richter, and Shixuan Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2024-1927, https://doi.org/10.5194/egusphere-2024-1927, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Analysis of the interaction between the climate and ozone in the stratosphere is complicated by the in-ability climate model in simulating the Quasi-Biennial Oscillation (QBO) – an important climate mode in the stratosphere. We use a set of model simulation that realistically simulate QBO and a novel ozone diagnostic tool to separate the temperature and circulation-driven QBO impact. These are important for diagnosing model-model differences in the QBO-ozone responses for climate projections.
27 Jun 2024
Global carbon emission accounting: national-level assessment of wildfire CO2 emission – a case study of China
Xuehong Gong, Zeyu Liu, Jie Tian, Qiyuan Wang, Guohui Li, Zhisheng An, and Yongming Han
EGUsphere, https://doi.org/10.5194/egusphere-2024-1684, https://doi.org/10.5194/egusphere-2024-1684, 2024
Preprint under review for ACP (discussion: open, 2 comments)
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Our study analyzed CO2 emissions from wildfires in China from 2001 to 2022. Cropland and forest fires contributed the most, while grassland fires were the least. Emissions from forest and shrub fires decreased significantly, while cropland fires increased. The highest emissions were in Heilongjiang and Inner Mongolia. China's effective policy management has reduced wildfire-related CO2 emissions, aiding global climate change efforts.
27 Jun 2024
Extreme Heat and Wildfire Emissions Enhance Volatile Organic Compounds: Insights on Future Climate
Christian Mark Garcia Salvador, Jeffrey D. Wood, Emma Grace Cochran, Hunter A. Seubert, Bella D. Kamplain, Sam S. Overby, Kevin R. Birdwell, Lianhong Gu, and Melanie A. Mayes
EGUsphere, https://doi.org/10.5194/egusphere-2024-1808, https://doi.org/10.5194/egusphere-2024-1808, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Critical volatile organic compounds were continuously measured in a temperate deciduous and juniper forest in the midwestern US using PTR-ToF-MS. The forest included several sources of biogenic compounds and was influenced by short- and long-range transport of anthropogenic emissions. Extreme heat and wildfire emissions impacted the atmospheric conditions of the forest during the field measurement; such emissions are vital phenomena that provide insights into future climate.
25 Jun 2024
Unheralded contributions of biogenic volatile organic compounds from urban greening to ozone pollution: a high-resolution modeling study
Haofan Wang, Yuejin Li, Yiming Liu, Xiao Lu, Yang Zhang, Qi Fan, Tianhang Zhang, and Chong Shen
EGUsphere, https://doi.org/10.5194/egusphere-2024-1163, https://doi.org/10.5194/egusphere-2024-1163, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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This study explores how urban green spaces in Guangzhou influence ozone levels. By using advanced models, we found that natural emissions from these areas can significantly affect air quality. Our results suggest the design and planning of urban green spaces should not only consider aesthetics and social factors but also their environmental impacts on air quality.
24 Jun 2024
Surface Observation Constrained High Frequency Coal Mine Methane Emissions in Shanxi China Reveal More Emissions than Inventories, Consistency with Satellite Inversion
Fan Lu, Kai Qin, Jason Blake Cohen, Qin He, Pravash Tiwari, Wei Hu, Chang Ye, Yanan Shan, Qing Xu, Shuo Wang, and Qiansi Tu
EGUsphere, https://doi.org/10.5194/egusphere-2024-1784, https://doi.org/10.5194/egusphere-2024-1784, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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This work describes a field campaign and new fast emissions estimation approach to attribute methane from a large known and previously unknown coal mine in Shanxi China. The emissions computed are shown to be larger than known oil and gas sources, indicating that methane from coal mines may play a larger role in the global methane budget. The results are found to be slightly larger than or similar to satellite observational campaigns over the same region.
24 Jun 2024
Measurement Report: Long-term Assessment of Primary and Secondary Organic Aerosols in Shanghai Megacity throughout China’s Clean Air Actions since 2010
Haifeng Yu, Yunhua Chang, Lin Cheng, Yusen Duan, and Jianlin Hu
EGUsphere, https://doi.org/10.5194/egusphere-2024-1488, https://doi.org/10.5194/egusphere-2024-1488, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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This study presents long-term measurements and comprehensive analysis of carbonaceous aerosols in PM2.5 in Shanghai. We further estimated POC and SOC levels, examining their temporal variations on interannual, monthly, seasonal, and diurnal scales. Through rigorous statistical analysis and correlation studies with meteorological parameters and pollutant concentrations, the origins, formation mechanisms, and spatial distribution patterns of SOC were elucidated.
21 Jun 2024
AERO-MAP: A data compilation and modelling approach to understand spatial variability in fine and coarse mode aerosol composition
Natalie M. Mahowald, Longlei Li, Julius Vira, Marje Prank, Douglas S. Hamilton, Hitoshi Matsui, Ron L. Miller, Louis Lu, Ezgi Akyuz, Daphne Meidan, Peter G. Hess, Heikki Lihavainen, Christine Wiedinmyer, Jenny Hand, Maria Grazia Alaimo, Célia Alves, Andres Alastuey, Paulo Artaxo, Africa Barreto, Francisco Barraza, Silvia Becagli, Giulia Calzolai, Shankararaman Chellam, Ying Chen, Patrick Chuang, David D. Cohen, Cristina Colombi, Evangelia Diapouli, Gaetano Dongarra, Konstantinos Eleftheriadis, Johann Engelbrecht, Corinne Galy-Lacaux, Cassandra Gaston, Dario Gomez, Yenny González Ramos, Roy M. Harrison, Chris Heyes, Barak Herut, Philip Hopke, Christoph Hüglin, Maria Kanakidou, Zsofia Kertesz, Zbigniew Klimont, Katriina Kyllönen, Fabrice Lambert, Xiaohong Liu, Remi Losno, Franco Lucarelli, Willy Maenhaut, Beatrice Marticorena, Randall V. Martin, Nikolaos Mihalopoulos, Yasser Morera-Gomez, Adina Paytan, Joseph Prospero, Sergio Rodríguez, Patricia Smichowski, Daniela Varrica, Brenna Walsh, Crystal Weagle, and Xi Zhao
EGUsphere, https://doi.org/10.5194/egusphere-2024-1617, https://doi.org/10.5194/egusphere-2024-1617, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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Aerosol particles are an important part of the Earth system, but their concentrations are spatially and temporally heterogeneous, as well as variable in size and composition. Here we present a new compilation of PM2.5 and PM10 aerosol observations, focusing on the spatial variability across different observational stations, including composition, and demonstrate a method for comparing the datasets to model output.
17 Jun 2024
Impact of Arctic Amplification variability on the chemical composition of the snowpack in Svalbard
Azzurra Spagnesi, Elena Barbaro, Matteo Feltracco, Federico Scoto, Marco Vecchiato, Massimiliano Vardè, Mauro Mazzola, François Yves Burgay, Federica Bruschi, Clara Jule Marie Hoppe, Allison Bailey, Andrea Gambaro, Carlo Barbante, and Andrea Spolaor
EGUsphere, https://doi.org/10.5194/egusphere-2024-1393, https://doi.org/10.5194/egusphere-2024-1393, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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Svalbard is a relevant area to evaluate changes in local environmental processes induced by Arctic Amplification (AA). By comparing the snow chemical composition of the 2019–20 season with 2018–19 and 2020–21, we provide an overview of the potential impacts of AA on the Svalbard snowpack, and associated changes in aerosol production process, influenced by a complex interplay between atmospheric patterns, local and oceanic conditions that jointly drive snowpack impurity amounts and composition.
10 Jun 2024
Isolating aerosol-climate interactions in global kilometre-scale simulations
Ross J. Herbert, Andrew I. L. Williams, Philipp Weiss, Duncan Watson-Parris, Elisabeth Dingley, Daniel Klocke, and Philip Stier
EGUsphere, https://doi.org/10.5194/egusphere-2024-1689, https://doi.org/10.5194/egusphere-2024-1689, 2024
Preprint under review for ACP (discussion: final response, 4 comments)
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Clouds exist at scales that climate models struggle to represent, limiting our knowledge of how climate change may impact clouds. Here we use a new km-scale global model representing an important step towards the necessary scale. We focus on how aerosol particles modify clouds, radiation, and precipitation. We find the magnitude and manner of responses tend to vary from region to region, highlighting the potential of global km-scale simulations and a need to represent aerosols in climate models.
06 Jun 2024
Protection without poison: Why tropical ozone maximizes in the interior of the atmosphere
Aaron Match, Edwin P. Gerber, and Stephan Fueglistaler
EGUsphere, https://doi.org/10.5194/egusphere-2024-1552, https://doi.org/10.5194/egusphere-2024-1552, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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Explanations for the tropical ozone maximum at 26 km have fragmented into two paradigms, shown to represent limiting regimes of ozone photochemistry with production by UV and generalized destruction by catalytic cycles and transport. Paradoxically, neither paradigm explains the observed ozone peak, motivating a new theory: peak ozone occurs precisely at the transition between these regimes. An idealized analytical ozone profile is derived, helping to interpret sensitivities to UV perturbations.
03 Jun 2024
Estimation of seasonal methane fluxes over a Mediterranean rice paddy area using the Radon Tracer Method (RTM)
Roger Curcoll, Josep-Anton Morguí, Alba Àgueda, Lídia Cañas, Sílvia Borràs, Arturo Vargas, and Claudia Grossi
EGUsphere, https://doi.org/10.5194/egusphere-2024-1370, https://doi.org/10.5194/egusphere-2024-1370, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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In this work, the methane emissions from the rice crops of the Ebro Delta were estimated with the Radon Tracer Method, using backtrajectories and radon and methane observations. Estimated fluxes show a strong seasonality with maximums in October, corresponding with the period of harvest and straw incorporation. The estimated annual methane emission was about 262.8 kg CH4 ha‑1. Results were compared with fluxes obtained with static chambers showing a stunning agreement between both methodologies.
30 May 2024
Technical note: Theoretical and experimental investigation of isotopic exchange between water vapour and droplets under isothermal saturation conditions
Wenwen Bai, Jiahua Wei, Sanchuan Ni, Zhanyu Yao, Yifeng Liu, Jingjing Ding, Kaiyu Wang, Nan Liu, Liner Wang, and Miao Wu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2024-4, https://doi.org/10.5194/acp-2024-4, 2024
Revised manuscript not accepted (discussion: closed, 5 comments)
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To explore influence of exchange process on vapour isotopes, IECEWV was derived based on mass conservation, indoor experiments were designed and conducted. The calculated isotopes in water vapour was consistent with experimental value, isotopes exchange can lead to the hydrogen and oxygen isotope line of vapour deviate from the origin, water vapour d-excess remains essentially constant. Combined IECEWV with the Rayleigh fractionation, vapour and precipitation isotope variation can be explored.
27 May 2024
Lagrangian Coherent Structures to Examine Mixing in the Stratosphere
Jezabel Curbelo and Marianna Linz
EGUsphere, https://doi.org/10.5194/egusphere-2024-1348, https://doi.org/10.5194/egusphere-2024-1348, 2024
Revised manuscript accepted for ACP (discussion: final response, 3 comments)
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Studying stratospheric mixing is crucial for understanding atmospheric dynamics and chemical transport. We propose a new Lagrangian metric based on the density of transport barriers, attracting/repelling coherent structures, to analyze mixing in the Whole Atmosphere Community Climate Model. Our metric is a promising tool for stratospheric analysis, consistent with commonly used metrics to quantify mixing while also providing the advantage of reflecting Lagrangian transport in physical latitude.
21 May 2024
Long-lasting high-latitude volcanic eruptions as a trigger for sudden stratospheric warmings: An idealized model experiment
Hera Guðlaugsdóttir, Yannick Peings, Davide Zanchettin, and Guðrún Magnúsdóttir
EGUsphere, https://doi.org/10.5194/egusphere-2024-1302, https://doi.org/10.5194/egusphere-2024-1302, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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Here we use an Earth System Model to simulate a long-lasting volcanic eruption at 65° N to assess its climate effects. We show a Polar Vortex strengthening in winter 1 and a weakening in winters 2–3 due to surface cooling that further causes an increase in sudden stratospheric warmings. This can cause severe cold weather events in the northern hemisphere. Our motivation is to understand how such eruptions impact the climate system for improving decadal climate predictability.
17 May 2024
The evolution of warm rain in trade-wind cumulus during EUREC4A
Gary Lloyd, Alan Blyth, Zhiqiang Cui, Thomas Choularton, Keith Bower, Martin Gallagher, Michael Flynn, Nicholas Marsden, Leif Denby, and Peter Gallimore
EGUsphere, https://doi.org/10.5194/egusphere-2024-142, https://doi.org/10.5194/egusphere-2024-142, 2024
Preprint under review for ACP (discussion: final response, 4 comments)
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Clouds that develop in the tropical trade-wind regions are extensive and persistent in nature. They are important for understanding how the magnitude of warming by these cloud systems might change in a warming climate. This paper describes measurements of common cloud types in these regions (shallow cumulus clouds) and the way in which they produce rainfall. During different periods, with different amounts of particulate in the air, the characteristics of the clouds were very different.
07 May 2024
Vertical Profiles of Liquid Water Content in fog layers during the SOFOG3D experiment
Théophane Costabloz, Frédéric Burnet, Christine Lac, Pauline Martinet, Julien Delanoë, Susana Jorquera, and Maroua Fathalli
EGUsphere, https://doi.org/10.5194/egusphere-2024-1344, https://doi.org/10.5194/egusphere-2024-1344, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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This study documents vertical profiles of liquid water content (LWC) in fogs from in situ measurements collected during the SOFOG3D field campaign in 2019–2020. The analysis of 140 vertical profiles reveals a reverse trend in LWC, maximum values at ground decreasing with height, during stable conditions in optically thin fogs, evolving towards quasi-adiabatic characteristics when fogs become thick. These results offer new perspectives for better constraining fog numerical simulations.
06 May 2024
Measurement report: Temporal variability of vertical profiles of CO2 and CH4 over urban environment
Mirosław Zimnoch, Michał Gałkowski, Piotr Sekuła, Łukasz Chmura, Jakub Bartyzel, Alina Jasek-Kamińska, Alicja Skiba, Jarosław Nęcki, Przemysław Wachniew, and Paweł Jagoda
EGUsphere, https://doi.org/10.5194/egusphere-2024-1167, https://doi.org/10.5194/egusphere-2024-1167, 2024
Preprint under review for ACP (discussion: final response, 3 comments)
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The manuscript presents the dataset collected in the urban area of Krakow city containing several measurement campaigns focused on the investigation of vertical CO2 and CH4 profiles supplemented by set of meteorological parameters (e.g. temperature, pressure) measured along the profiles up to ca. 280 m a.g.l. The presented data collection explains the dynamics of the lower atmosphere on a daily and seasonal scale providing the three dimensional dataset that can be used for model validation.
06 May 2024
Spatial-temporal patterns of anthropogenic and biomass burning contributions on air pollution and mortality burden changes in India from 1995 to 2014
Bin Luo, Yuqiang Zhang, Tao Tang, Hongliang Zhang, Jianlin Hu, Jiangshan Mu, Wenxing Wang, and Likun Xue
EGUsphere, https://doi.org/10.5194/egusphere-2024-974, https://doi.org/10.5194/egusphere-2024-974, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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India is facing a severe air pollution crisis that poses significant health risks, particularly from PM2.5 and O3. Our study reveals rising levels of both pollutants from 1995 to 2014, leading to increased premature mortality. While anthropogenic emissions play a significant role, biomass burning also impacts air quality, in particular seasons and regions in India. This study highlights the urgent need for localized policies to protect public health amid escalating environmental challenges.
19 Apr 2024
Assessing the global contribution of marine, terrestrial bioaerosols, and desert dust to ice-nucleating particle concentrations
Marios Chatziparaschos, Stelios Myriokefalitakis, Nikos Kalivitis, Nikos Daskalakis, Athanasios Nenes, María Gonçalves Ageitos, Montserrat Costa-Surós, Carlos Pérez García-Pando, Mihalis Vrekoussis, and Maria Kanakidou
EGUsphere, https://doi.org/10.5194/egusphere-2024-952, https://doi.org/10.5194/egusphere-2024-952, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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We show distinct seasonal and geographical patterns in the contributions of mineral dust, marine and terrestrial biological particles to ice-nucleating particles (INP) concentrations that lead to atmospheric ice formation, a major source of uncertainty in climate predictions. Bioaerosols are the major source of INP at high temperatures, while mineral dust influences the global INP population at lower temperatures. These particles can satisfactorily reproduce INP in a climate model.
18 Apr 2024
How does the lifetime of detrained cirrus impact the high cloud radiative effect in the tropics?
George Horner and Edward Gryspeerdt
EGUsphere, https://doi.org/10.5194/egusphere-2024-1090, https://doi.org/10.5194/egusphere-2024-1090, 2024
Revised manuscript accepted for ACP (discussion: final response, 8 comments)
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This work tracks the lifecycle of thin cirrus clouds that flow out of tropical convective storms. These cirrus clouds are found to have a warming effect on the atmosphere over their whole lifetime. Thin cirrus that originate from land origin convection warm more than those of ocean origin. Moreover, if the lifetime of these cirrus clouds increase, the warming they exert over their whole lifetime also increases. These results help us understand how these clouds might change in a future climate.
16 Apr 2024
Urban morphology modulates thunderstorm process and associatied cloud-to-ground lightning activity over Beijing metropolitan region
Tao Shi, Yuanjian Yang, Gaopeng Lu, Zuofang Zheng, Yucheng Zi, Ye Tian, Lei Liu, and Simone Lolli
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2024-3, https://doi.org/10.5194/acp-2024-3, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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This study found that CG lightning tends to cluster around the outer boundaries of large cities, but gathers within small cities. The urban underlying surface can contribute to the separation of cold pools, weakening vertical airflow, and triggering thunderstorm bifurcation. The density of buildings also influences the barrier effect. This research provides a foundation for predicting and assessing urban CG lightning risks.
10 Apr 2024
Pollution affects Arabian and Saharan dust optical properties in the Eastern Mediterranean
Marilena Teri, Josef Gasteiger, Katharina Heimerl, Maximilian Dollner, Manuel Schöberl, Petra Seibert, Anne Tipka, Thomas Müller, Sudharaj Aryasree, Konrad Kandler, and Bernadett Weinzierl
EGUsphere, https://doi.org/10.5194/egusphere-2024-701, https://doi.org/10.5194/egusphere-2024-701, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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The A-LIFE aircraft field experiment was carried out in the Eastern Mediterranean in 2017. Using A-LIFE data, we studied the change in mineral dust optical properties due to mixing with anthropogenic aerosols. We found that increasing pollution affects dust optical properties which has implications for identifying dust events and understanding their climate effects. We also show that optical properties of Saharan and Arabian dust are similar when comparing cases with equal pollution content.
12 Mar 2024
Regional and sectoral contributions of NOx and reactive carbon emission sources to global trends in tropospheric ozone during the 2000–2018 period
Aditya Nalam, Aura Lupascu, Tabish Ansari, and Timothy Butler
EGUsphere, https://doi.org/10.5194/egusphere-2024-432, https://doi.org/10.5194/egusphere-2024-432, 2024
Revised manuscript accepted for ACP (discussion: final response, 6 comments)
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Tropospheric O3 molecules are labelled with the identity of their precursor source in CAM-Chem to quantify the contribution from various emission sources to the tropospheric O3 burden (TOB) and its trends. With an equatorward shift, anthropogenic NOx emissions become significantly more efficient at producing O3 and play a major role in driving TOB trends. This is due to larger convection at the tropics effectively lifting O3 and its precursors to the free troposphere where O3 lifetime is longer.
02 Feb 2024
Emission Inventory Development for Spatiotemporal Release of Vanadium from Anthropogenic Sources in China
Han Zhang, Baogang Zhang, Bo Jiang, Qimin Li, Xuewen Hu, and Yi Xing
EGUsphere, https://doi.org/10.5194/egusphere-2024-10, https://doi.org/10.5194/egusphere-2024-10, 2024
Revised manuscript accepted for ACP (discussion: final response, 4 comments)
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We developed the vanadium emission inventories of anthropogenic sources in China during 2015–2019. We identified five major emission sources, including coal combustion, oil burning, transportation, industrial manufacture, and waste handling. Emission outputs were calculated by integrating the emission factors and activity levels of vanadium related processes. Our results identified the key emitters and highlighted the spatial and temporal patterns of vanadium releases.
26 Jan 2024
Investigating the role of stratospheric ozone as a driver of inter-model spread in CO2 effective radiative forcing
Rachael Byrom, Gunnar Myhre, Dirk Olivié, and Michael Schulz
EGUsphere, https://doi.org/10.5194/egusphere-2024-111, https://doi.org/10.5194/egusphere-2024-111, 2024
Revised manuscript accepted for ACP (discussion: final response, 7 comments)
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Addressing the cause of model spread in CO2 effective radiative forcing is important for reducing uncertainty in climate change. We investigate stratospheric ozone as a driver of this spread by changing its concentration by 50 % and analysing the impact on CO2 forcing. Our idealised experiments show a significant impact on stratospheric temperature but a minimal impact on CO2 forcing due to the combined effect on longwave emission and gaseous spectral overlap.
23 Jan 2024
Technical Note: General Formulation For the Distribution Problem: Prognostic Assumed PDF Approach Based on The Maximum–Entropy Principle and The Liouville Equation
Jun-Ichi Yano, Vince Larson, and Vaughan T. J. Phillips
EGUsphere, https://doi.org/10.5194/egusphere-2023-2278, https://doi.org/10.5194/egusphere-2023-2278, 2024
Revised manuscript under review for ACP (discussion: final response, 4 comments)
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The distribution problems appear in atmospheric sciences at almost every corner for describing diverse processes. This manuscript presents a general formulation for addressing all these problem.
09 Nov 2023
Prominent role of organics in aerosol liquid water content over the south-eastern Atlantic during biomass burning season
Lu Zhang, Michal Segal-Rozenhaimer, Haochi Che, Caroline Dang, Junying Sun, Ye Kuang, and Paola Formenti
EGUsphere, https://doi.org/10.5194/egusphere-2023-2319, https://doi.org/10.5194/egusphere-2023-2319, 2023
Revised manuscript under review for ACP (discussion: final response, 3 comments)
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Our study examined the interaction between atmospheric particles and moisture over the south-eastern Atlantic Ocean during the biomass burning seasons in Africa. We found that organic components of these particles play a more important role in aerosol-moisture interactions than previously expected. This discovery is important as such interactions impact radiation and climate. Current climate models might need better representations of the moisture-absorbing properties of organic aerosols.
08 Mar 2023
Technical Note: The impact of industrial activity on the amount of atmospheric O2
Mark O. Battle, Raine Raynor, Stephen Kesler, and Ralph Keeling
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-765, https://doi.org/10.5194/acp-2022-765, 2023
Preprint withdrawn (discussion: closed, 4 comments)
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For decades, we have used measurements of atmospheric oxygen to understand how much carbon dioxide leaves the atmosphere and enters the land biosphere and the oceans. Until now, these calculations have ignored the release of oxygen associated with the refining of iron, aluminum and copper from their ores. In this article, we show that this release of oxygen is indeed much smaller than all of the other terms that have been included in the calculations and the earlier calculations are valid.
07 Feb 2023
Impact of the Atmospheric Boundary Layer Height on the Concentration of Chemical Species in Numerical Model Simulations
Shuzhan Ren and Craig A. Stroud
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2023-37, https://doi.org/10.5194/acp-2023-37, 2023
Revised manuscript not accepted (discussion: closed, 4 comments)
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The atmospheric boundary layer height is involved in the turbulence parameterization scheme employed in numerical models. It affects the concentration of chemical species by changing the vertical diffusivity and the volume of tracer in the atmosphere. There exists large uncertainties in the boundary layer height. The impacts of the uncertainties on the model simulation of concentration of chemical species are examined. The results show different impacts in different parameterization scheme.
23 Jan 2023
Research on the unusual spring 2020 Arctic stratospheric ozone depletion above Ny-Ålesund, Norway
Qidi Li, Yuhan Luo, Yuanyuan Qian, Chen Pan, Ke Dou, Xuewei Hou, Fuqi Si, and Wenqing Liu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-859, https://doi.org/10.5194/acp-2022-859, 2023
Revised manuscript not accepted (discussion: closed, 7 comments)
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We found that all instruments recorded severe ozone depletion from March 18 to April 18, 2020. The effect of the polar vortex on ozone depletion in the stratosphere was clear. Additionally, the SD-WACCM model results indicated that both ClO and BrO concentrations peaked in late March. Before chlorine activation began, bromine mainly existed as HOBr; however, after chlorine activation, bromine mainly existed in the form of BrCl.
03 Jan 2023
What is the cause(s) of ozone trends in three megacity clusters in eastern China during 2015–2020?
Tingting Hu, Yu Lin, Run Liu, Yuepeng Xu, Boguang Wang, Yuanhang Zhang, and Shaw Chen Liu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-781, https://doi.org/10.5194/acp-2022-781, 2023
Revised manuscript not accepted (discussion: closed, 6 comments)
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We hypothesize that the cause of the worsening O3 trends in the Beijing-Tianjin-Hebei region, the Yangtze River Delta, and the Pearl River Delta from 2015 to 2020 is attributable to the increased occurrence of meteorological conditions of high solar radiation and positive temperature anomaly under the influence of West Pacific Subtropical High, tropical cyclones as well as mid-high latitude wave activities.
20 Dec 2022
Enhanced behaviors of optical properties and the radiative effects of molecular-specific brown carbon from dung combustion in the Tibetan Plateau
Qian Zhang, Yujie Zhang, Zhichun Wu, Bin Zhang, Yaling Zeng, Jian Sun, Hongmei Xu, Qiyuan Wang, Zhihua Li, Junji Cao, and Zhenxing Shen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-801, https://doi.org/10.5194/acp-2022-801, 2022
Revised manuscript not accepted (discussion: closed, 4 comments)
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We identified the brown carbon (BrC) molecules and their absorbing abilities on a molecular level from animal dung fuel combustion over the Tibetan Plateau region in China. The ultra-high performance liquid chromatography quadrupole time-of-flight mass spectrometer coupled with the partial least squares regression were precisely applied to characterize the molecular absorptions, key molecular markers, and radiative effects of BrC from household combustion scenarios at the high-altitude area.
19 Dec 2022
Secondary Aerosol Formation in Incense Burning Particles by Ozonolysis and Photochemical Oxidation
Zhancong Liang, Liyuan Zhou, Xinyue Li, Rosemarie Ann Infante Cuevas, Rongzhi Tang, Mei Li, Chunlei Cheng, Yangxi Chu, and Chak Keung Chan
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-838, https://doi.org/10.5194/acp-2022-838, 2022
Preprint withdrawn (discussion: closed, 6 comments)
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Incense burning is a common religious ritual, especially in Asian and African communities, with massive particles emitted. While previous research mainly focused on the chemical compositions and potential health impacts of fresh incense particles, our work reveals that nitrate, accompanied by SOA, can rapidly form in incense-burning particles upon photochemical oxidation in the atmosphere. This finding could deepen our understanding of air pollution caused by religious activities.
14 Dec 2022
On the Quasi-2-Day Planetary Waves in the Middle Atmosphere During Different QBO Phases
Liang Tang, Sheng-Yang Gu, Shu-Yue Zhao, and Dong Wang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-778, https://doi.org/10.5194/acp-2022-778, 2022
Revised manuscript not accepted (discussion: closed, 9 comments)
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We found that the interannual difference of the W3 and W4 Q2DW is significantly correlated with the Quasi-Biennial Oscillation westerly (QBOW) and easterly (QBOE) phase. In addition, planetary waves gain stronger source activity during the QBOW phase to provide sufficient energy for propagation and amplification. Overall, this study reveals a difference between the dynamics of mid-latitude westward planetary waves in the QBOW and QBOE phases.
01 Nov 2022
Assessment of the impacts of cloud chemistry on surface SO2 and sulfate levels in typical regions of China
Jian-yan Lu, Sunling Gong, Chun-hong Zhou, Jian Zhang, Jian-min Chen, and Lei Zhang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-716, https://doi.org/10.5194/acp-2022-716, 2022
Revised manuscript not accepted (discussion: closed, 4 comments)
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A regional online chemical weather model WRF/ CUACE was used to assess the contributions of cloud chemistry to the SO2 and sulfate levels in typical regions in China. The cloud chemistry scheme in CUACE was evaluated, and well reproduces the cloud chemistry processes. During cloud availability in a heavy pollution episode, the sulfate production increases 40–80 % and SO2 reduces over 80 %. This study provides a way to analyze the over-estimate phenomenon of SO2 in many chemical transport models.
04 Oct 2022
Possible evidence of increased global cloudiness due to aerosol-cloud interactions
Alyson Rose Douglas and Tristan L'Ecuyer
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-688, https://doi.org/10.5194/acp-2022-688, 2022
Revised manuscript not accepted (discussion: closed, 7 comments)
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Aerosol, or small particles released by human activities, enter the atmosphere and eventually interact with clouds in what we term aerosol-cloud interactions. As more aerosol enter a cloud, they act as cloud droplet nuclei, increasing the number of cloud droplets in a cloud and delaying rain formation, leading to a larger cloud. We use machine learning and found that these interactions lead to 1.27 % more cloudiness on Earth and offset ~1/4 of the warming due to CO2.
21 Sep 2022
Latitudinal Dependence of the Geomagnetic and Solar Activity Effect on Sporadic-E layer
Qiong Tang, Chen Zhou, Huixin Liu, Yi Liu, Jiaqi Zhao, Zhibin Yu, Zhengyu Zhao, and Xueshang Feng
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-534, https://doi.org/10.5194/acp-2022-534, 2022
Preprint withdrawn (discussion: closed, 3 comments)
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The geomagnetic and solar effect on Es is studied. The negative correlation between Es and geomagnetic activity at mid-latitude is related to the decreased meteor rate during storm period. The increased Es occurrence in high latitude relates to the changing electric field. The positive correlation between Es and solar activity at high latitude is due to the enhanced IMF in solar maximum. The negative correlation in mid and low latitudes relates to the decreased meteor rate during solar activity.
19 Sep 2022
Predicted and Observed Changes in Summertime Biogenic and Total Organic Aerosol in the Southeast United States from 2001 to 2010
Brian T. Dinkelacker, Pablo Garcia Rivera, Ksakousti Skyllakou, Peter J. Adams, and Spyros N. Pandis
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-648, https://doi.org/10.5194/acp-2022-648, 2022
Revised manuscript not accepted (discussion: closed, 4 comments)
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A number of factors have influenced the biogenic secondary organic aerosol (SOA) levels in the southeastern US from 2001 to 2010. The increases in temperature have led to an increase of the emissions of biogenic volatile organic compounds by trees and a corresponding increase of the SOA. However, this increase has been balanced by the reductions in the anthropogenic emissions of organic gases and particulate matter as well as of the oxides of nitrogen keeping the biogenic SOA roughly constant.
12 Sep 2022
Gravity waves generated by the high graupel/hail loading through buoyancy oscillations in an overshooting hailstorm
Xin Guo, Xueliang Guo, and Danhong Fu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-559, https://doi.org/10.5194/acp-2022-559, 2022
Preprint withdrawn (discussion: closed, 7 comments)
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We report that downward propagating gravity waves can be generated by the high graupel/hail loading through buoyancy oscillations in an overshooting hailstorm, and have important impacts on the storm itself and the stratospheric atmosphere through the surface reflection. The finding has potential applications in storm tracking and forecasting, as well as momentum, energy and pollution transport from the low to high atmosphere in the continental region.
12 Sep 2022
Characteristics of Aeolian sediments transported above a gobi surface
Zhengcai Zhang, Yan Zhang, and Kaijia Pan
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-485, https://doi.org/10.5194/acp-2022-485, 2022
Revised manuscript not accepted (discussion: closed, 6 comments)
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In this study, we measured sediment transport by the wind above gobi surfaces in the field, and found high sand transport rates and saltation (hopping) heights above the gobi surfaces. The change of the transport rate with height could be expressed as a Gaussian peak function. The observed sediment transport results from the nature of the gravel surface and from soil crusts, which cause higher saltation above a gobi surface than above mobile sand.
06 Sep 2022
Impact of cruising speed on the ship-based sampling of marine fog frequency
Li Yi and King-Fai Li
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-593, https://doi.org/10.5194/acp-2022-593, 2022
Preprint withdrawn (discussion: closed, 3 comments)
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Thorough understanding of the climatology of marine fog is highly relevant to marine traffic safety under global change. The definition of marine fog frequency commonly used in previous research has ignored the fact that marine fog itself impacts the cruising speeds of the ships due to human’s decisions on safety, which lead to a sampling bias in fog conditions and hence the apparent frequency of the marine fog occurrences, especially in coastal regions with heavy marine traffic.
15 Aug 2022
Nonlinear resonant interactions of atmospheric tides with annual oscillation based on meteor radar observation and reanalysis data
Xiansi Huang, Kaiming Huang, Hao Cheng, Shaodong Zhang, Wei Cheng, Chunming Huang, and Yun Gong
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-407, https://doi.org/10.5194/acp-2022-407, 2022
Revised manuscript not accepted (discussion: closed, 7 comments)
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Using radar observations and reanalysis data for 9 years, we demonstrate clearly for the first time that resonant interactions between tides and annual and semiannual oscillations do occur in the mesosphere and lower thermosphere. The resonant matching conditions of frequency and wavenumber are exactly satisfied for the interacting triad. At some altitudes, the secondary waves are stronger than the tides, thus in tidal studies, the secondary waves may be mistaken for the tides if no carefully.
10 Aug 2022
Measurement Report: Observed Increase in Southern Hemisphere Reflected Energy from Clouds During December 2020 and 2021
Jay Herman, Liang Huang, David Hafner, and Adam Szabo
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-481, https://doi.org/10.5194/acp-2022-481, 2022
Publication in ACP not foreseen (discussion: closed, 4 comments)
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The research object is to see if reflections from clouds by the DSCOVR satellite at the Earth-Sun Lagrange point are enhanced as the backscattering angle nears 180 degrees. The 388 nm wavelength channel sees almost nothing from the Earth's surface. The result is that the Southern Hemisphere radiance increase in December 2020 and 2021 is likely caused by cloud amount increase and not by enhanced reflectivity at a 178-degree backscatter angle.
02 Aug 2022
Seasonal variation in size-resolved particle deposition and the effect of environmental conditions on dry deposition in a pine forest
Erin K. Boedicker, Holly M. DeBolt, Ryan Fulgam, Ethan W. Emerson, and Delphine K. Farmer
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-431, https://doi.org/10.5194/acp-2022-431, 2022
Preprint withdrawn (discussion: closed, 3 comments)
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We present particle flux and size-resolved dry deposition measurements from a pine forest for all four major seasons. Dry deposition of particles was highest in the winter and was significantly elevated compared to the summer data. Several mechanisms were investigated to determine what effects were driving the enhanced deposition in the winter. We show that the wintertime changes are likely caused by changes in plant physiology and needle structure that increase the influence of interception.
28 Jul 2022
High variations of BVOC emissions from Norway spruce in boreal forests
Hannele Hakola, Ditte Taipale, Arnaud Praplan, Simon Schallhart, Steven Thomas, Toni Tykkä, Aku Helin, Jaana Bäck, and Heidi Hellén
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-478, https://doi.org/10.5194/acp-2022-478, 2022
Revised manuscript not accepted (discussion: closed, 4 comments)
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Norway spruce is one of the main tree species growing in the boreal area. We show that volatile organic compound emission potentials and compound composition vary a lot. We have investigated if e.g. growing location or age of a tree could explain the variations. Recognizing this observed large variability in spruce BVOC emissions (precursors for new particle formation processes), we also tested the consequences of this variability in simulations of aerosol formation.
25 Jul 2022
Water enhances the formation of fragmentation products via the cross-reactions of RO2 and HO2 in the photooxidation of isoprene
Jiayun Xu, Zhongming Chen, Xuan Qin, and Ping Dong
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-444, https://doi.org/10.5194/acp-2022-444, 2022
Revised manuscript not accepted (discussion: closed, 4 comments)
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We investigated the photooxidation of isoprene in the presence of water. We found that water enhanced the formation of methacrolein and methyl vinyl ketone in the first-generation reactions by changing the structures of the reaction intermediates and raised formic acid and acetic acid yields considerably in the multi-generation reactions. The results of this study help understand the fate of isoprene in the atmosphere and improve the effect of the atmospheric simulations.
18 Jul 2022
Low contributions of dimethyl sulfide (DMS) chemistry to atmospheric aerosols over the high Arctic Ocean
Miming Zhang, Jinpei Yan, Qi Lin, Hongguo Zheng, Keyhong Park, Shuhui Zhao, Suqing Xu, Meina Ruan, Shanshan Wang, Xinlin Zhong, and Suli Zhao
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-454, https://doi.org/10.5194/acp-2022-454, 2022
Revised manuscript not accepted (discussion: closed, 4 comments)
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Extremely low contribution of DMS chemistry to the aerosols over the high AO was determined by the inhibition of marine phytoplankton, which extends the knowledge how will biogenic sulfur cycle impact the regional climate as AO sea ice retreat in the future.
12 Jul 2022
High accuracy calculation and data quality evaluation of ship emissions based on the sniffer method
Letian Zhu and Fan Zhou
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-452, https://doi.org/10.5194/acp-2022-452, 2022
Revised manuscript not accepted (discussion: closed, 6 comments)
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Increasing amounts of ship exhaust gases emitted worldwide have been increasing, generating an impact on the environment and human health and we propose a high accuracy calculation method of ship emission factor and an evaluation of the quality of measurement data that reduces the uncertainty in the current sniffer technique monitoring ship emission research. This method can help people evaluate the ship's emission inventory more accurately.
04 Jul 2022
Contribution of marine biological emissions to gaseous methylamines in the atmosphere: an emission inventory based on satellite data
Qi Zhang, Shiguo Jia, Weihua Chen, Jingying Mao, Liming Yang, Padmaja Krishnan, Sayantan Sarkar, Min Shao, and Xuemei Wang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-394, https://doi.org/10.5194/acp-2022-394, 2022
Revised manuscript not accepted (discussion: closed, 6 comments)
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We use satellite data in the establishment of methylamines marine biological emission (MBE) inventory for the first time, which considers effects of actual marine environment on methylamines emission fluxes. MBE fluxes of monomethylamine and trimethylamines can be comparable with or even higher than that of terrestrial anthropogenic emissions , while for dimethylamines, the ocean acts as a sink. Wind and Chlorophyll-a were potentially the most important factors affecting MBE fluxes.
27 Jun 2022
Daily evolution of VOCs in Beijing: chemistry, emissions, transport, and policy implications
Marios Panagi, Roberto Sommariva, Zoë L. Fleming, Paul S. Monks, Gongda Lu, Eloise A. Marais, James R. Hopkins, Alastair C. Lewis, Qiang Zhang, James D. Lee, Freya A. Squires, Lisa K. Whalley, Eloise J. Slater, Dwayne E. Heard, Robert Woodward-Massey, Chunxiang Ye, and Joshua D. Vande Hey
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-379, https://doi.org/10.5194/acp-2022-379, 2022
Revised manuscript not accepted (discussion: closed, 5 comments)
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A dispersion model and a box model were combined to investigate the evolution of VOCs in Beijing once they are emitted from anthropogenic sources. It was determined that during the winter time the VOC concentrations in Beijing are driven predominantly by sources within Beijing and by a combination of transport and chemistry during the summer. Furthermore, the results in the paper highlight the need for a season specific policy.
23 Jun 2022
Variations and correlations of CO, C2H2, C2H6, H2CO and HCN columns derived from three years of ground-based FTIR measurements at Xianghe, China
Minqiang Zhou, Bavo Langerock, Pucai Wang, Corinne Vigouroux, Qichen Ni, Christian Hermans, Bart Dils, Nicolas Kumps, Weidong Nan, and Martine De Mazière
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-354, https://doi.org/10.5194/acp-2022-354, 2022
Revised manuscript not accepted (discussion: closed, 4 comments)
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The ground-based FTIR measurements at Xianghe provide carbon monoxide (CO), acetylene (C2H2), ethane (C2H6), formaldehyde (H2CO), and hydrogen cyanide (HCN) total columns between June 2018 and November 2021. The retrieval strategies, retrieval information, and uncertainties of these five important trace gases are presented and discussed. This study provides an insight into the time series, variations, and correlations of these five species in North China.
16 Jun 2022
Current and future prediction of inter-provincial transport of ambient PM2.5 in China
Shansi Wang, Siwei Li, Jia Xing, Yu Ding, Senlin Hu, Shuchang Liu, Yu Qin, Zhaoxin Dong, Jiaxin Dong, Ge Song, and Lechao Dong
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-368, https://doi.org/10.5194/acp-2022-368, 2022
Preprint withdrawn (discussion: closed, 7 comments)
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Future warming meteorological conditions may enhance the influence of regional transport on PM2.5 pollution. Our results prove that climate-friendly policy could lead to considerable co-benefits in mitigating the regional transport of PM2.5 in future. Meanwhile, climate change will exert larger impacts on across-regional (long-distance) transport than inner (neighboring provinces) regional transport, highlighting the significance of multi-regional cooperation in the future.
03 Jun 2022
How extreme apparitions of the volcanic and anthropogenic south east Asian aerosol plume trigger and sustain: El Niño and Indian Ocean Dipole events; and drought in south eastern Australia. First attribution and mechanism using Global Volcanism Program, Last Millennium Ensemble, MERRA-2 reanalysis and NASA satellite data
Keith Alan Potts
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-362, https://doi.org/10.5194/acp-2022-362, 2022
Revised manuscript not accepted (discussion: closed, 3 comments)
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El Niño events, the greatest inter-annual variation in the global climate, are and always have been caused by volcanic aerosols in south east Asia. Recently the volcanic aerosols have been augmented by anthropogenic aerosols especially 15 from September to November which has intensified ENSO events. The same aerosol plume also creates drought in south eastern Australia and Indian Ocean Dipole events simultaneously. Volcanic, modelling, reanalysis and measured data all show the same results.
01 Jun 2022
Evidence for mass independent fractionation of even mercury isotopes in the troposphere
Shuyuan Huang, Yunlong Huo, Heng Sun, Supeng Lv, Yuhan Zhao, Kunning Lin, Yaojin Chen, and Yuanbiao Zhang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-284, https://doi.org/10.5194/acp-2022-284, 2022
Revised manuscript not accepted (discussion: closed, 3 comments)
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The Hg sources and atmospheric transformations in the marine boundary layer of the open ocean is revealed by Hg stable isotopes. Anthropogenic emissions are responsible for high Hg concentrations, while photoreduction of Hg(II) and Hg(0) oxidation play important role in shifting Hg isotopic compositions. Mass independent fractionation signatures are useful in quantifying contributions of various atmospheric transformations of Hg.
30 May 2022
Water uptake and the gas-particle partitioning of nitrate aerosols
Hoang Duong Do, Yong Bin Lim, and Yong Pyo Kim
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-364, https://doi.org/10.5194/acp-2022-364, 2022
Revised manuscript not accepted (discussion: closed, 3 comments)
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Using HTDMA measurements and thermodynamic model simulations we found that 1) Nitrate aerosols maintain deliquescence in the entire range of 10–90% RH; 2) ALWC and nitrates in ammonium-sulfate-nitrate aerosols simultaneously evaporate; 3) Glyoxal exhibits a synergetic effect on ALWC formation with ammonium sulfates; and 4) In NH4-SO4-NO3-glyoxal aerosols, more ALWC and nitrates form above 50 % RH.
18 May 2022
Detection of Stratospheric Air Intrusion Events From Ground-based High-resolution 10Be / 7Be by Accelerator Mass Spectrometry
Xu-Ke Liu, Yun-Chong Fu, Li Zhang, George S. Burr, Yan-Ting Bi, and Guo-Qing Zhao
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-282, https://doi.org/10.5194/acp-2022-282, 2022
Revised manuscript not accepted (discussion: closed, 6 comments)
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Based on the high-precision analysis of the accelerator mass spectrometer, the stratospheric air intrusion process of different intensities throughout the year was recorded for the first time with the daily resolution beryllium-10 / beryllium-7 ratio. The local weak stratospheric intrusion events in the Chinese Loess Plateau were directly detected on the ground, and it was found that these processes has a significant contribution to surface ozone.
17 May 2022
Seasonal characteristics of atmospheric formaldehyde (HCHO) in a coastal city of southeast China: Formation mechanism and photochemical effects
Taotao Liu, Yiling Lin, Jinsheng Chen, Gaojie Chen, Chen Yang, Lingling Xu, Mengren Li, Xiaolong Fan, Yanting Chen, Liqian Yin, Yuping Chen, Xiaoting Ji, Ziyi Lin, Fuwang Zhang, Hong Wang, and Youwei Hong
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-292, https://doi.org/10.5194/acp-2022-292, 2022
Revised manuscript not accepted (discussion: closed, 4 comments)
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Field observations and models analysis were carried out in a coastal city to study HCHO formation mechanism and its impacts on photochemistry. HCHO contributed to atmospheric oxidation by around 10 %, reflecting its significance in photochemistry. Disabling HCHO mechanism made net O3 production rates decrease by 31 %, which were dominated by the reductions of pathways relating to radical reactions, indicating the HCHO affected O3 mainly by controlling the efficiencies of radical propagation.
16 May 2022
Interannual variability of winds in the Antarctic mesosphere and lower thermosphere over Rothera (67° S, 68° W) in radar observations and WACCM-X
Phoebe Noble, Neil Hindley, Corwin Wright, Chihoko Cullens, Scott England, Nicholas Pedatella, Nicholas Mitchell, and Tracy Moffat-Griffin
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-150, https://doi.org/10.5194/acp-2022-150, 2022
Revised manuscript not accepted (discussion: closed, 4 comments)
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We use long term radar data and the WACCM-X model to study the impact of dynamical phenomena, including the 11-year solar cycle, ENSO, QBO and SAM, on Antarctic mesospheric winds. We find that in summer, the zonal wind (both observationally and in the model) is strongly correlated with the solar cycle. We also see important differences in the results from the other processes. In addition we find important and large biases in the winter model zonal winds relative to the observations.
13 May 2022
Technical note: Identification and quantification of gaseous and particulate organic compounds from cooking fumes by comprehensive two-dimensional gas chromatography-mass spectrometry
Yuanzheng Gong, Kai Song, Song Guo, Daqi Lv, Yuan Zhang, Zichao Wan, Wenfei Zhu, Hui Wang, Ying Yu, Rui Tan, Ruizhe Shen, Sihua Lu, Shuangde Li, and Yunfa Chen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-326, https://doi.org/10.5194/acp-2022-326, 2022
Preprint withdrawn (discussion: closed, 1 comment)
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Herein we applied thermal desorption comprehensive two-dimensional gas chromatography-mass spectrometer (TD-GCxGC-MS) for synchronous analysis of gaseous and particulate organics emitted from cooking fumes. With a systematic 4-step qualitative procedure and precise quantitative and semi-quantitative method, 170 and 352 compounds from C2 (acetic acids) – C30 (squalene) occupying 95 % and 90 % of the total ion current for gaseous and particulate samples were identified and quantified.
10 May 2022
Measurement report: Structure of the atmospheric boundary layer and its relationship with the land-atmosphere interaction on the Tibetan Plateau
Maoshan Li, Wei Fu, Na Chang, Ming Gong, Pei Xu, Yaoming Ma, Zeyong Hu, Yaoxian Yang, and Fanglin Sun
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-257, https://doi.org/10.5194/acp-2022-257, 2022
Revised manuscript not accepted (discussion: closed, 5 comments)
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Compared with the plain area, the land-atmosphere interaction on the Tibetan Plateau (TP) is intense and complex, which affects the structure of the boundary layer. The observed height of the convective boundary layer on the TP under the influence of the southern branch of the westerly wind was higher than that during the Asian monsoon season. The height of the boundary layer was positively correlated with the sensible heat flux and negatively correlated with latent heat flux.
06 May 2022
The Information Content of Dense Carbon Dioxide Measurements from Space: A High-Resolution Inversion Approach with Synthetic Data from the OCO-3 Instrument
Dustin Roten, John C. Lin, Lewis Kunik, Derek Mallia, Dien Wu, Tomohiro Oda, and Eric A. Kort
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-315, https://doi.org/10.5194/acp-2022-315, 2022
Revised manuscript not accepted (discussion: closed, 3 comments)
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The systems used to monitor carbon dioxide (CO2) emissions from urban areas provides a means to observe and quantify emissions reductions from policy-related reduction efforts. Space-based instruments, such as NASA's Orbiting Carbon Observatory-3 (OCO-3), provides detailed "snapshots" of CO2 emissions from many megacities around the world. This work quantifies the amount of emission "information" contained in these snapshots and uses this information to update previous estimates of urban CO2.
26 Apr 2022
Diagnosing the stratospheric proportion in tropospheric ozone using triple oxygen isotopes as tracers
Hao Xu, Urumu Tsunogai, Fumiko Nakagawa, Keiichi Sato, and Hiroshi Tanimoto
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-1099, https://doi.org/10.5194/acp-2021-1099, 2022
Revised manuscript not accepted (discussion: closed, 4 comments)
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Using triple oxygen isotopic composition (Δ17O) of ozone as a new tracer, we estimated the absolute concentrations of stratospheric ozone supplied through stratosphere-troposphere transport in the troposphere. We observed the diurnal variations in the Δ17O of ozone, which could have affected studies (field measurements, atmospheric modeling) using Δ17O to constrain atmospheric chemical paths. Our study provides an important basis for a better understanding of ozone behavior in the troposphere.
22 Apr 2022
Long-term variation study of fine-mode particle size and regional characteristics using AERONET data
Juseon Shin, Juhyeon Sim, Naghmeh Dehkhoda, Sohee Joo, Taekyung Kim, Gahyung Kim, Detlef Müller, Matthias Tesche, Sungkyun Shin, Dongho Shin, and Youngmin Noh
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-219, https://doi.org/10.5194/acp-2022-219, 2022
Preprint withdrawn (discussion: closed, 2 comments)
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We analyzed long-term AERONET sun/sky radiometer for 6 continentals to verify the trend of aerosol physical properties depending on sources (dust or pollution) and size (fine or coarse mode). We identified the trend of classified aerosol optical depth (AOD) and size change over 9 years. Especially, we find out aerosol properties causing AOD variations are different from regions and fine aerosol particle in most regions has become smaller using MK-test for trend analysis.
22 Apr 2022
Process-based microphysical characterization of a strong mid-latitude convective system using aircraft in situ cloud measurements
Mireia Papke Chica, Valerian Hahn, Tiziana Braeuer, Elena de la Torre Castro, Florian Ewald, Mathias Gergely, Simon Kirschler, Luca Bugliaro Goggia, Stefanie Knobloch, Martina Kraemer, Johannes Lucke, Johanna Mayer, Raphael Maerkl, Manuel Moser, Laura Tomsche, Tina Jurkat-Witschas, Martin Zoeger, Christian von Savigny, and Christiane Voigt
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-255, https://doi.org/10.5194/acp-2022-255, 2022
Preprint withdrawn (discussion: closed, 4 comments)
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The mixed-phase temperature regime in convective clouds challenges our understanding of microphysical and radiative cloud properties. We provide a rare and unique dataset of aircraft in situ measurements in a strong mid-latitude convective system. We find that mechanisms initiating ice nucleation and growth strongly depend on temperature, relative humidity, and vertical velocity and variate within the measured system, resulting in altitude dependent changes of the cloud liquid and ice fraction.
11 Apr 2022
Radical chemistry at a UK coastal receptor site – Part 1: observations of OH, HO2, RO2, and OH reactivity and comparison to MCM model predictions
Robert Woodward-Massey, Roberto Sommariva, Lisa K. Whalley, Danny R. Cryer, Trevor Ingham, William J1 Bloss, Sam Cox, James D. Lee, Chris P. Reed, Leigh R. Crilley, Louisa J. Kramer, Brian J. Bandy, Grant L. Forster, Claire E. Reeves, Paul S. Monks, and Dwayne E. Heard
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-207, https://doi.org/10.5194/acp-2022-207, 2022
Preprint withdrawn (discussion: closed, 4 comments)
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We measured radicals (OH, HO2, RO2) and OH reactivity at a UK coastal site and compared our observations to the predictions of an MCMv3.3.1 box model. We find variable agreement between measured and modelled radical concentrations and OH reactivity, where the levels of agreement for individual species display strong dependences on NO concentrations. The most substantial disagreement is found for RO2 at high NO (> 1 ppbv), when RO2 levels are underpredicted by a factor of ~10–30.
11 Apr 2022
Insight into seasonal aerosol concentrations, meteorological influence, and transport over the Pan-Third Pole region using multi-sensors satellite and model simulation
Mukesh Rai, Shichang Kang, Junhua Yang, Maheswar Rupakheti, Dipesh Rupakheti, Lekhendra Tripathee, Yuling Hu, and Xintong Chen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-199, https://doi.org/10.5194/acp-2022-199, 2022
Revised manuscript not accepted (discussion: closed, 4 comments)
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Our study revealed distinctive seasonality with the maximum and minimum aerosol concentrations during the winter and summer seasons respectively. However, interestingly summer high (AOD > 0.8) was observed over South Asia. The highest aerosols are laden over South Asia and East China within 1–2 km, however, aerosol overshooting found up to 10 km due to the deep convection process. Whereas, integrated aerosol transport for OC during spring was found to be 5 times higher than the annual mean.
21 Mar 2022
How volcanic eruption latitudes diversify surface climate responses
Seungmok Paik, Seung-Ki Min, Seok-Woo Son, Soon-Il An, Jong-Seong Kug, and Sang-Wook Yeh
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-187, https://doi.org/10.5194/acp-2022-187, 2022
Revised manuscript not accepted (discussion: closed, 5 comments)
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This paper investigates Earth’s surface climate response to volcanic eruptions at different latitudes. By analyzing last millennium ensemble simulations of a coupled climate model, we have identified physical processes associated with the diverse impacts of volcanic eruption latitudes, focusing on the tropical ocean surface warming and the stratospheric polar vortex intensification. Our results provide important global implications for atmospheric responses to future volcanic aerosols.
21 Mar 2022
Solitary wave characteristics on the fine structure of mesospheric sporadic sodium layer
Shican Qiu, Mengxi Shi, Willie Soon, Mingjiao Jia, Xianghui Xue, Tao Li, Peng Ju, and Xiankang Dou
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-1085, https://doi.org/10.5194/acp-2021-1085, 2022
Revised manuscript not accepted (discussion: closed, 6 comments)
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The solitary wave theory is applied for the first time to study the sporadic sodium layers (NaS). We perform soliton fitting processes on the observed data from the Andes Lidar Observatory, and find out that 24/27 NaS events exhibit similar features to a soliton. Time series of the net anomaly reveal the same variation process to the solution of a five-order KdV equation. Our results suggest the NaS phenomenon would be an appropriate tracer for nonlinear wave studies in the atmosphere.
21 Mar 2022
Insights on estimating urban CO2 emissions using eddy-covariance flux measurements
Kyung-Eun Min, Junphil Mun, Begie Perdigones, Soojin Lee, and Kyung-Hwan Kwak
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-205, https://doi.org/10.5194/acp-2022-205, 2022
Revised manuscript not accepted (discussion: closed, 4 comments)
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For knowing the accurate amount of human-induced CO2, emission strengths of individual activities were assessed via direct eddy-covariance observations at urban-atmosphere interface. This work extracted emission factors (EFs) with minimized seasonal effects through day of the week difference with varying wind sectors. Our work urges the need for not only emission inventory validation but also seasonal bias free EFs estimations for establishing effective climate mitigation strategies.
11 Mar 2022
Relationships linking satellite-retrieved ocean color data with atmospheric components in the Arctic
Marjan Marbouti, Sehyun Jang, Silvia Becagli, Gabriel Navarro, Rita Traversi, Kitack Lee, Tuomo Nieminen, Lisa J. Beck, Markku Kulmala, Veli-Matti Kerminen, and Mikko Sipilä
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-52, https://doi.org/10.5194/acp-2022-52, 2022
Publication in ACP not foreseen (discussion: closed, 2 comments)
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This research was done to understand and investigate the roles of Chl-a, PP and sea ice extent in controlling and producing the in-situ measured MSA, SA, HIO3, HOM and aerosol concentrations over the Greenland and Barents Seas. Our results provide strong support to the hypothesis that MSA, SA and small-particle concentrations in the Svalbard area are directly linked to ocean biological activity and sea ice melting during springtime.
09 Mar 2022
Measurement Report: Real-Time Remote Sensing of the Coastal Boundary Layer and its Interaction with Meteorology at Cape Grim, Australia
Zhenyi Chen, Robyn Schofield, Melita Keywood, Sam Cleland, Alastair G. Williams, Alan Griffiths, Stephen Wilson, Peter Rayner, and Xiaowen Shu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-104, https://doi.org/10.5194/acp-2022-104, 2022
Revised manuscript not accepted (discussion: closed, 4 comments)
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This study studied the marine boundary layer (MBL) process and aerosol properties in the Southern Ocean using miniMPL, ceilometer and sodar. Compared to the gradient method, the Image Edge Detection Algorithm provides more reliable boundary layer height estimations, especially when a convective MBL with stratification existed. The diurnal characteristic of BLH with the veering of the wind vector was also observed. Under the continental sources, the MBL maintained a well-mixed layer of 0.3 km.
02 Mar 2022
Tropical cirrus clouds of convective and non-convective origins
Qin Huang and Tra Dinh
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-146, https://doi.org/10.5194/acp-2022-146, 2022
Revised manuscript not accepted (discussion: closed, 4 comments)
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The roles of convection and non-convective processes in driving the occurrence of cirrus clouds in the tropics are quantified. We found that three quarters of tropical cirrus originate from convection. The remaining cirrus are driven by negative temperature anomalies associated with waves and/or the adiabatic cooling associated with the upwelling of the Brewer–Dobson circulation. The findings would be helpful to guide development of models to improve their representation of cirrus clouds.
22 Feb 2022
Long-term visibility variation at the Ebro Observatory (1960–2020)
Juan José Curto and Nicolás Tacoronte
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-1092, https://doi.org/10.5194/acp-2021-1092, 2022
Revised manuscript has not been submitted (discussion: closed, 2 comments)
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Long term variation of surface horizontal visibility is a clear indicator of atmospheric quality and it does not depend on any measurement device susceptible of lack of calibration. In this paper we present visibility series measured at Ebro Observatory (Spain), in the western part of Mediterranean area. Although these observations being performed in a priori “clean” location, no natural causes can explain the visibility trends and the anthropogenic activity is the most probable cause.
18 Feb 2022
Carbon dioxide variations in the upper troposphere and lower stratosphere from GOSAT TANSO-FTS TIR profile data
Akihiro Honda, Nawo Eguchi, and Naoko Saitoh
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-46, https://doi.org/10.5194/acp-2022-46, 2022
Revised manuscript not accepted (discussion: closed, 6 comments)
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The intra-seasonal, seasonal and inter-annual variations of carbon dioxide (CO2) at the upper troposphere and lower stratosphere (UTLS) are investigated by the CO2 profile data derived from the thermal infrared spectra of TANSO-FTS instrument onboard GOSAT satellite, for understanding of the missing sink of CO2 and detail exchange process between UT and LS. There are new findings on the intra-seasonal and inter-annual variations associated with Asian summer monsoon and ENSO, respectively.
15 Feb 2022
Possible controls on Arctic clouds by natural aerosols from long-range transport of biogenic emissions and ozone depletion events
Rupert Holzinger, Oliver Eppers, Kouji Adachi, Heiko Bozem, Markus Hartmann, Andreas Herber, Makoto Koike, Dylan B. Millet, Nobuhiro Moteki, Sho Ohata, Frank Stratmann, and Atsushi Yoshida
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-95, https://doi.org/10.5194/acp-2022-95, 2022
Revised manuscript not accepted (discussion: closed, 3 comments)
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In spring 2018 the research aircraft Polar 5 conducted flights in the Arctic atmosphere. The flight operation was from Station Nord in Greenland, 1700 km north of the Arctic Circle (81°43'N, 17°47'W). Using a mass spectrometer we measured more than 100 organic compounds in the air. We found a clear signature of natural organic compounds that are transported from forests to the high Arctic. These compounds have the potential to change the cloud cover and energy budget of the Arctic region.
11 Feb 2022
Measurements of ice crystal fluxes from the surface at a mountain top site
Waldemar Schledewitch, Gary Lloyd, Keith Bower, Thomas Choularton, Michael Flynn, and Martin Gallagher
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-69, https://doi.org/10.5194/acp-2022-69, 2022
Publication in ACP not foreseen (discussion: closed, 2 comments)
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Ice crystals on the surface of ice and snow covered terrain are thought to be transported into clouds that cover the surface. This has important implications for the properties of clouds in these regions. This research measured the potential transport of surface based ice crystals into the surrounding clouds at a mountain top site.
08 Feb 2022
PM2.5 Source Apportionment using Organic Marker-based CMB Modeling: Influence of Inorganic Markers and Sensitivity to Source Profiles
Yingze Tian, Xiaoning Wang, Peng Zhao, Zongbo Shi, and Roy M. Harrison
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-1007, https://doi.org/10.5194/acp-2021-1007, 2022
Revised manuscript not accepted (discussion: closed, 4 comments)
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Chemical mass balance (CMB) is a widely used method to apportion the sources of PM2.5. We explore the sensitivity of CMB results to input data of organic markers only (OM-CMB) with a combination of organic and inorganic markers (IOM-CMB), as well as using different chemical profiles for sources. Our results indicate the superiority of combining inorganic and organic tracers and using locally-relevant source profiles in source apportionment of PM.
03 Feb 2022
Technical Note: A High-Resolution Autonomous Record of Ice Nuclei Concentrations for Fall and Winter at Storm Peak Laboratory
Anna L. Hodshire, Ezra J. T. Levin, A. Gannet Hallar, Christopher N. Rapp, Dan R. Gilchrist, Ian McCubbin, and Gavin R. McMeeking
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-29, https://doi.org/10.5194/acp-2022-29, 2022
Preprint withdrawn (discussion: closed, 4 comments)
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The new Continuous Flow Diffusion Chamber-Ice Activation Spectrometer collected 4 months of ice nucleating particle (INP) measurements at a 5-minute resolution at the mountainside Storm Peak Laboratory. Most long-term INP measurements are at a time resolution of a day or longer: our instrument is a promising advance towards high-resolution long-term INP measurements. We observe higher peak INP concentrations than previous mountain studies, possibly due to the higher time resolution of our data.
01 Feb 2022
Estimation of isentropic stirring and mixing and their diagnosis for the stratospheric polar vortex
Zhiting Wang, Nils Hase, Wenshou Tian, and Mengchu Tao
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-1096, https://doi.org/10.5194/acp-2021-1096, 2022
Publication in ACP not foreseen (discussion: closed, 2 comments)
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The distribution of trace gases in the stratosphere impacts the thermal and dynamical structures of the atmosphere. The spatial structure of the trace gases is determined by the residual circulation and stirring and mixing processes. Currently the stirring is purely constrained due to lack of observation. Here we develop a diagnosis for stirring mainly based on the trace gas contour. The method is applied for estimating stirring and mixing effects on methane concentration in a polar vortex.
31 Jan 2022
Modelling the atmospheric 34S-sulfur budget in a column model under volcanically quiescent conditions
Juhi Nagori, Narcisa Nechita-Bândă, Sebastian Oscar Danielache, Masumi Shinkai, Thomas Röckmann, and Maarten Krol
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-68, https://doi.org/10.5194/acp-2022-68, 2022
Publication in ACP not foreseen (discussion: closed, 5 comments)
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The sulfur isotopes (32S and 34S) were studied to understand the sources, sinks and processes of carbonyl sulphide (COS) in the atmosphere. COS is an important source of sulfur aerosol in the stratosphere (SSA). Few measurements of COS and SSA exist, but with our 1D model, we were able to match them and show the importance of COS to sulfate formation. Moreover, we are able to highlight some important processes for the COS budget and where measurements may fill a gap in current knowledge.
03 Jan 2022
Non-reversible aging can increase solar absorption in African biomass burning aerosol plumes of intermediate age
Amie Dobracki, Paquita Zuidema, Steve Howell, Pablo Saide, Steffen Freitag, Allison C. Aiken, Sharon P. Burton, Arthur J. Sedlacek III, Jens Redemann, and Robert Wood
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-1081, https://doi.org/10.5194/acp-2021-1081, 2022
Preprint withdrawn (discussion: closed, 4 comments)
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The global maximum of shortwave-absorbing aerosol above cloud occurs above the southeast Atlantic, where the biomass-burning aerosol provides a distinct aerosol radiative warming of regional climate. The smoke aerosols are unusually highly absorbing of sunlight. This study seeks to understand the cause. We conclude the aerosol is already strongly absorbing at the fire emission source, but that chemical aging, through encouraging a net loss of organic aerosol, also contributes.
23 Dec 2021
Identifying Source Region Elemental Indicators in Aged Saharan Dust Plumes Over the Tropical Atlantic
Daniel E. Yeager and Vernon R. Morris
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-932, https://doi.org/10.5194/acp-2021-932, 2021
Preprint withdrawn (discussion: closed, 2 comments)
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This work examines the spatial dependency of Saharan dust aerosol composition over the Tropical Atlantic Ocean using observations collected during the 2015 Aerosols and Ocean Science Expedition. We find that source region elemental signatures remain detectable in airborne dust samples collected far into the Tropical Atlantic Ocean. These observations could validate assessments of Saharan dust aerosol effects on regional climate, ocean ecosystems, satellite observations, and air quality.
02 Dec 2021
Autoxidation of terpenes, a common pathway in tropospheric and low temperature combustion conditions: the case of limonene and α-pinene
Roland Benoit, Nesrine Belhadj, Maxence Lailliau, and Philippe Dagaut
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-964, https://doi.org/10.5194/acp-2021-964, 2021
Revised manuscript not accepted (discussion: closed, 8 comments)
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While the oxidation kinetics of alpha-pinene and limonene have been extensively studied and mechanisms of OH and/or ozone oxidation have been proposed, further studies are needed to better understand their oxidation pathways. This work provides further insight into the oxidation mechanisms of alpha-pinene and limonene, particularly autoxidation, and presents graphical tools that are increasingly used for the processing of high resolution mass spectrometry data.
29 Nov 2021
Observation Based Budget and Lifetime of Excess Atmospheric Carbon Dioxide
Stephen E. Schwartz
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-924, https://doi.org/10.5194/acp-2021-924, 2021
Revised manuscript not accepted (discussion: closed, 8 comments)
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Carbon dioxide is central to anthropogenic climate change, but the response of CO2 to potential reductions in emissions is quite uncertain. Current model estimates of the lifetime of excess atmospheric CO2 above preindustrial range from about 150 years to upwards of 500 years. Based on a global budget and a compartment model this lifetime is constrained here to 110 ± 30 years. These results demonstrate that reduction of CO2 emissions could yield tangible results within a human lifespan.
25 Nov 2021
Aerosol radiative effects with dual view AOD retrievals
Stefan Kinne, Peter North, Kevin Pearson, and Thomas Popp
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-954, https://doi.org/10.5194/acp-2021-954, 2021
Publication in ACP not foreseen (discussion: closed, 4 comments)
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To monitor aerosol properties and quantify aerosol climate impacts, ESA's Climate Change Initiative (CCI) supported the retrieval development for their dual-view sensors. Global maps of monthly AOD and AODf data are presented for 4 years: 1998 using ATSR-2, 2008 using AATSR and 2019 and 2020 using SLSTR sensor data. Application goals of this paper are to address decadal aerosol trends, to identify possible Covid-19 impacts in 2020 and to associate retrieved AOD with climate impacts.
15 Nov 2021
Role of emission sources and atmospheric sink on the seasonal cycle of CH4 and δ13-CH4: analysis based on the atmospheric chemistry transport model TM5
Vilma Kangasaho, Aki Tsuruta, Leif Backman, Pyry Mäkinen, Sander Houweling, Arjo Segers, Maarten Krol, Ed Dlugokencky, Sylvia Michel, James White, and Tuula Aalto
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-843, https://doi.org/10.5194/acp-2021-843, 2021
Revised manuscript not accepted (discussion: closed, 4 comments)
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Understanding the composition of carbon isotopes can help to better understand the changes in methane budgets. This study investigates how methane sources affect the seasonal cycle of the methane carbon-13 isotope during 2000–2012 using an atmospheric transport model. We found that emissions from both anthropogenic and natural sources contribute. The findings raise a need to revise the magnitudes, proportion, and seasonal cycles of anthropogenic sources and northern wetland emissions.
01 Nov 2021
Formation characteristics of aerosol triplet state and coupling effect between the separated components with different polarity
Dongjie Guan, Qingcai Chen, Jinwen Li, Hao Li, Lixin Zhang, Yuqin Wang, Xiaofei Li, and Tian Chang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-842, https://doi.org/10.5194/acp-2021-842, 2021
Preprint withdrawn (discussion: closed, 3 comments)
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The photochemical reactions of atmospheric aerosols are complicated, some reaction processes exist which have not been identified at present. This study focuses on a new mechanism of photochemical reactions, namely triplet reactions (3C*), and its potential impact on aerosol aging. This study demonstrate the coupling effect of 3C* formation between different aerosol components. The result is novel and useful in explaining how complex components affect photochemical aging of atmospheric aerosol.
29 Oct 2021
Technical note: Investigating sub-city gradients of air quality: lessons learned with low-cost PM2.5 and AOD monitors and machine learning
Michael Cheeseman, Bonne Ford, Zoey Rosen, Eric Wendt, Alex DesRosiers, Aaron J. Hill, Christian L'Orange, Casey Quinn, Marilee Long, Shantanu H. Jathar, John Volckens, and Jeffrey R. Pierce
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-751, https://doi.org/10.5194/acp-2021-751, 2021
Revised manuscript not accepted (discussion: closed, 3 comments)
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This article predicts concentrations of airborne particulate matter over wintertime Denver, CO, USA, using meteorological and geographic information, as well as low-cost aerosol optical depth (AOD) measurements captured by citizen scientists. Machine learning methods revealed that low boundary layer heights and stagnant air were the best predictors of poor air quality, while AOD provided little skill in predicting particulate matter for this location and time period.
25 Oct 2021
Contribution of the gas-phase reaction between hydroxyl radical and sulfur dioxide to the sulfate aerosol over West Pacific
Yu-Wen Chen, Yi-Chun Chen, Charles C.-K. Chou, Hui-Ming Hung, Shih-Yu Chang, Lisa Eirenschmalz, Michael Lichtenstern, Helmut Ziereis, Hans Schlager, Greta Stratmann, Katharina Kaiser, Johannes Schneider, Stephan Borrmann, Florian Obersteiner, Eric Förster, Andreas Zahn, Wei-Nai Chen, Po-Hsiung Lin, Shuenn-Chin Chang, Maria Dolores Andrés Hernández, Pao-Kuan Wang, and John P. Burrows
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-788, https://doi.org/10.5194/acp-2021-788, 2021
Preprint withdrawn (discussion: closed, 2 comments)
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By presenting an approach using EMeRGe-Asia airborne field measurements and surface observations, this study shows that the fraction of OH reactivity due to SO2-OH reaction has a significant correlation with the sulfate concentration. Approximately 30 % of sulfate is produced by SO2-OH reaction. Our results underline the importance of SO2-OH gas-phase oxidation in sulfate formation, and demonstrate that the method can be applied to other regions and under different meteorological conditions.
25 Oct 2021
MAX-DOAS observations of formaldehyde and nitrogen dioxide at three sites in Asia and comparison with the global chemistry transport model CHASER
Hossain M. S. Hoque, Kengo Sudo, Hitoshi Irie, Alessandro Damiani, and Al Mashroor Fatmi
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-815, https://doi.org/10.5194/acp-2021-815, 2021
Revised manuscript not accepted (discussion: closed, 4 comments)
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Nitrogen dioxide (NO2) and formaldehyde (HCHO) profiles, retrieved from remote sensing observations, are used to evaluate the global chemistry transport model CHASER. Overall, CHASER has demonstrated good skills in reproducing the seasonal climatology of NO2 and HCHO on a local scale at sites in South and East Asia. Around mountainous terrains, the model performs better on a regional scale. The improved spatial resolution of CHASER can likely reduce the observed discrepancies in the datasets.
18 Oct 2021
Biomass burning events measured by lidars in EARLINET – Part 2: Optical properties investigation
Mariana Adam, Iwona S. Stachlewska, Lucia Mona, Nikolaos Papagiannopoulos, Juan Antonio Bravo-Aranda, Michaël Sicard, Doina N. Nicolae, Livio Belegante, Lucja Janicka, Dominika Szczepanik, Maria Mylonaki, Christina-Anna Papanikolaou, Nikolaos Siomos, Kalliopi Artemis Voudouri, Luca Alados-Arboledas, Arnoud Apituley, Ina Mattis, Anatoli Chaikovsky, Constantino Muñoz-Porcar, Aleksander Pietruczuk, Daniele Bortoli, Holger Baars, Ivan Grigorov, and Zahary Peshev
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-759, https://doi.org/10.5194/acp-2021-759, 2021
Revised manuscript not accepted (discussion: closed, 3 comments)
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Results over 10 years of biomass burning events measured by EARLINET are analysed by means of the intensive parameters, based on the methodology described in Part I. Smoke type is characterized for each of the four geographical regions based on continental smoke origin. Relationships between intensive parameters or colour ratios are shown. The smoke is labelled in average as aged smoke.
11 Oct 2021
Measurement report: Determination of Black Carbon concentration in PM2.5 fraction by Multi-wavelength absorption black carbon instrument (MABI)
Anna Ryś and Lucyna Samek
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-766, https://doi.org/10.5194/acp-2021-766, 2021
Preprint withdrawn (discussion: closed, 4 comments)
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This study shows how the contributions of biomass burning and fossil fuel/traffic to PM2.5 mass can be assessed. The samples of PM2.5 fraction were collected from February 1, 2020 to March 27, 2021 every third day. About 18 % of PM2.5 mass belongs to eBC. The eBC contribution is the significant part of PM2.5 mass and we observed seasonal variation of the eBC concentration during the year with the peak in winter.
05 Oct 2021
Measurement Report: Strong Valley Wind Events during the International Collaborative Experiment – PyeongChang 2018 Olympic and Paralympic Winter Games Project
Paul Joe, Gyuwon Lee, and Kwonil Kim
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-620, https://doi.org/10.5194/acp-2021-620, 2021
Preprint withdrawn (discussion: closed, 4 comments)
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Strong gusty wind events were responsible for poor performance of competitors and schedule changes during the PyeongChang 2018 Olympic and Paralympic Winter Games. Three events were investigated and documented to articulate the challenges confronting forecasters which is beyond what they normally do. Quantitative evidence of the challenge and recommendations for future Olympics are provided.
01 Oct 2021
Understanding the influence of combustion on atmospheric CO2 over Europe by using satellite observations of CO2 and reactive trace gases
Mehliyar Sadiq, Paul I. Palmer, Mark F. Lunt, Liang Feng, Ingrid Super, Stijn N. C. Dellaert, and Hugo A. C. Denier van der Gon
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-816, https://doi.org/10.5194/acp-2021-816, 2021
Publication in ACP not foreseen (discussion: closed, 4 comments)
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We make use of high-resolution emission inventory of CO2 and co-emitted tracers, satellite measurements, together with nested atmospheric transport model simulation, to investigate how reactive trace gases such as nitrogen dioxide and carbon monoxide can be used as proxies to determine the combustion contribution to atmospheric CO2 over Europe. We find stronger correlation in ratios of nitrogen dioxide and carbon dioxide between emission and satellite observed and modelled column concentration.
01 Sep 2021
Occurrence of new particle formation events in Siberian and Finnish boreal forest
Helmi Uusitalo, Jenni Kontkanen, Ilona Ylivinkka, Ekaterina Ezhova, Anastasiia Demakova, Mikhail Arshinov, Boris Denisovich Belan, Denis Davydov, Nan Ma, Tuukka Petäjä, Alfred Wiedensohler, Markku Kulmala, and Tuomo Nieminen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-530, https://doi.org/10.5194/acp-2021-530, 2021
Publication in ACP not foreseen (discussion: closed, 4 comments)
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Characteristics of formation of atmospheric aerosol at four boreal forest sites in Finland and Russian Siberia was analyzed. Our results provide information on the governing processes of atmospheric aerosol formation in the boreal forest area, which a substantial part of the continental biosphere. Aerosol formation was occurring less frequently at Siberian than in Finnish sites, which was affected by the lower particle growth rates and higher loss rates in Siberia.
30 Aug 2021
Impact of the COVID-19 pandemic on the observed vertical distributions of PM2.5, NOx, and O3 from a tower in the Pearl River Delta
Lei Li, Chao Lu, Pak-Wai Chan, Zi-Juan Lan, Wen-Hai Zhang, Hong-Long Yang, and Hai-Chao Wang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-579, https://doi.org/10.5194/acp-2021-579, 2021
Revised manuscript not accepted (discussion: closed, 6 comments)
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The COVID-19 induced lockdown provided a time-window to study the impact of emission decrease on atmospheric environment. A 350 m meteorological tower in the Pearl River Delta recorded the vertical distribution of pollutants during the lockdown period. The observation confirmed that an extreme emission reduction, can reduce the concentrations of fine particles and the peak concentration of ozone at the same time, which had been taken as difficult to realize in the past in many regions.
16 Aug 2021
Atmospheric stratification over Namibia and the southeast Atlantic Ocean
Danitza Klopper, Stuart J. Piketh, Roelof Burger, Simon Dirkse, and Paola Formenti
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-668, https://doi.org/10.5194/acp-2021-668, 2021
Revised manuscript not accepted (discussion: closed, 4 comments)
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The western coast of southern Africa is a key region of the Earth, with persistent clouds and particles also transported from distant forest fires. The atmosphere is stratified as a result of the different temperatures of the cold Atlantic ocean and the warm semi-arid land, and that affects how the particles will be distributed whilst in the atmosphere and how long they will persist. We used long term satellite and in situ observations to describe, for the first time, those main features.
02 Aug 2021
Assessment of strict autumn-winter emission controls on air quality in the Beijing-Tianjin-Hebei region
Gongda Lu, Eloise A. Marais, Tuan V. Vu, Jingsha Xu, Zongbo Shi, James D. Lee, Qiang Zhang, Lu Shen, Gan Luo, and Fangqun Yu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-428, https://doi.org/10.5194/acp-2021-428, 2021
Revised manuscript not accepted (discussion: closed, 3 comments)
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Emission controls were imposed in Beijing-Tianjin-Hebei in northern China in autumn-winter 2017. We find that regional PM2.5 targets (15 % decrease relative to previous year) were exceeded. Our analysis shows that decline in precursor emissions only leads to less than half (43 %) the improved air quality. Most of the change (57 %) is due to interannual variability in meteorology. Stricter emission controls may be necessary in years with unfavourable meteorology.
26 Jul 2021
Measurement report: Summertime and wintertime VOCs in Houston: Source apportionment and spatial distribution of source origins
Bavand Sadeghi, Arman Pouyaei, Yunsoo Choi, and Bernhard Rappenglueck
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-565, https://doi.org/10.5194/acp-2021-565, 2021
Revised manuscript not accepted (discussion: closed, 4 comments)
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The most significant contributions of VOCs over the Houston Ship Channel came from alkanes. Light alkanes were dominant sources in both seasons. We explored the photochemical reaction of organic compounds and studied their contributions to ozone formation. Ethylene and propylene have the highest. Through weighted trajectory, VOCs at Lynchburg Ferry site was influenced by petrochemical sectors of Baytown and Galveston Bay refineries and industrial facilities of the Bayport industrial district.
21 Jul 2021
Convection-Aerosol Interactions in the United Arab Emirates: A Sensitivity Study
Ricardo Fonseca, Diana Francis, Michael Weston, Narendra Nelli, Sufian Farah, Youssef Wehbe, Taha AlHosari, Oriol Teixido, and Ruqaya Mohamed
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-597, https://doi.org/10.5194/acp-2021-597, 2021
Revised manuscript not accepted (discussion: closed, 4 comments)
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High-sensitivity of summer convection and precipitation over the United Arab Emirates to aerosols properties and loadings.
16 Jul 2021
The influence of weather-driven processes on tropospheric ozone
Tamara Emmerichs, Bruno Franco, Catherine Wespes, Vinod Kumar, Andrea Pozzer, Simon Rosanka, and Domenico Taraborrelli
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-584, https://doi.org/10.5194/acp-2021-584, 2021
Revised manuscript not accepted (discussion: closed, 3 comments)
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Near-surface ozone is a harmful air pollutant and it is strongly affected by radical reactions and surface-atmosphere exchanges which in turn are modulated, directly and indirectly, by weather. Understanding the impact of weather on ozone, and air quality, is thus important also in view of weather extremes. The inclusion of additional ozone-weather links in the global model yields a 2-fold reduction of the ozone bias towards satellite observations.
11 Jun 2021
Introducing Ice Nucleating Particles functionality into the Unified Model and its impact on the Southern Ocean short-wave radiation biases
Vidya Varma, Olaf Morgenstern, Kalli Furtado, Paul Field, and Jonny Williams
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-438, https://doi.org/10.5194/acp-2021-438, 2021
Revised manuscript not accepted (discussion: closed, 4 comments)
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We introduce a simple parametrisation whereby the immersion freezing temperature in the model is linked to the mineral dust distribution through a diagnostic function, thus invoking regional differences in the nucleation temperatures instead of the global default value of −10 °C. This provides a functionality to mimic the role of Ice Nucleating Particles in the atmosphere on influencing the short-wave radiation over the Southern Ocean region by impacting the cloud phase.
08 Jun 2021
Surface charge of environmental and radioactive airborne particles
Gyoung Gug Jang, Alexander I. Wiechert, Austin P. Ladshaw, Tyler Spano, Joanna McFarlane, Kristian Myhre, Sotira Yiacoumi, and Costas Tsouris
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-417, https://doi.org/10.5194/acp-2021-417, 2021
Revised manuscript not accepted (discussion: closed, 3 comments)
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This manuscript is focused on the charge of particles in the atmosphere, including radioactive particles subjected to self-charging and diffusion-charging mechanisms. The microphysical charge and morphology characterization can be used to improve predictions of charged particle transport in the atmosphere including radioactive particles originating from nuclear accidents, such as the recent accident of Fukushima, Japan, or deliberate explosions of radiological dispersal devices.
27 May 2021
Towards monitoring CO2 source-sink distribution over India via inverse modelling: Quantifying the fine-scale spatiotemporal variability of atmospheric CO2 mole fraction
Vishnu Thilakan, Dhanyalekshmi Pillai, Christoph Gerbig, Michal Galkowski, Aparnna Ravi, and Thara Anna Mathew
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-392, https://doi.org/10.5194/acp-2021-392, 2021
Revised manuscript not accepted (discussion: closed, 6 comments)
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This paper demonstrates how we can make use of atmospheric observations to improve the CO2 flux estimates of India. This is achieved by improving the representation of terrain, mesoscale transport and flux variations. We quantify the impact of unresolved variations in the current models on optimally estimated fluxes via inverse modelling and quantify the associated flux uncertainty. We illustrate how a parameterization scheme captures this variability in the coarse models.
17 May 2021
Inter-annual, seasonal and diurnal features of the cloud liquid water path over the land surface and various water bodies in Northern Europe as obtained from the satellite observations by the SEVIRI instrument in 2011–2017
Vladimir S. Kostsov, Anke Kniffka, and Dmitry V. Ionov
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-387, https://doi.org/10.5194/acp-2021-387, 2021
Revised manuscript not accepted (discussion: closed, 7 comments)
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Studying interactions between different components of the climate system (the atmosphere, the hydrosphere, and the land surface) is an important scientific task due to the involvement of many processes. Cloud liquid water path (LWP) can be an indicator of some of these processes relevant to an exchange of moisture and heat between surface and atmosphere. The goal of the present study is to analyse the LWP horizontal inhomogeneities in the vicinity of various water bodies in Northern Europe.
04 May 2021
Measurement Report: Spatial and vertical variability of aerosol optical properties during MOABAI mobile on-road campaign in North China Plain
Ioana Elisabeta Popovici, Zhaoze Deng, Philippe Goloub, Xiangao Xia, Hongbin Chen, Luc Blarel, Thierry Podvin, Yitian Hao, Hongyan Chen, Disong Fu, Nan Yin, Benjamin Torres, Stéphane Victori, and Xuehua Fan
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-1269, https://doi.org/10.5194/acp-2020-1269, 2021
Preprint withdrawn (discussion: closed, 2 comments)
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This study reports results from MOABAI campaign (Mobile Observation of Atmosphere By vehicle-borne Aerosol measurement Instruments) in North China Plain in may 2017, a unique campaign involving a van equipped with remote sensing and in situ instruments to perform on-road mobile measurements. Aerosol optical properties and mass concentration profiles were derived, capturing the fine spatial distribution of pollution and concentration levels.
26 Apr 2021
Radiative energy budget and cloud radiative forcing in the daytime marginal sea ice zone during Arctic spring and summer
Johannes Stapf, André Ehrlich, Christof Lüpkes, and Manfred Wendisch
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-279, https://doi.org/10.5194/acp-2021-279, 2021
Preprint withdrawn (discussion: closed, 2 comments)
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Airborne observations of the surface radiative energy budget in the marginal sea ice zone (the region between open ocean and closed sea ice) are presented. Atmospheric thermodynamic profiles and surface properties change on small spatial scales in this area and influence the impact of clouds on the radiative energy budget. The radiation budget over sea ice is compared to available studies in the Arctic and the influence of cold air outbreaks and warm air intrusions is illustrated.
08 Apr 2021
Dust transport and horizontal fluxes measurement with spaceborne lidars ALADIN, CALIOP and model reanalysis data
Guangyao Dai, Kangwen Sun, Xiaoye Wang, Songhua Wu, Xiangying E, Qi Liu, and Bingyi Liu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-219, https://doi.org/10.5194/acp-2021-219, 2021
Revised manuscript not accepted (discussion: closed, 6 comments)
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In this paper, a Sahara dust event is tracked with the spaceborne lidars ALADIN and CALIOP and the models ECMWF and HYSPLIT. The capability in calculating the dust horizontal fluxes with the joint measurements from ALADIN and CALIOP coupled with the data from ECMWF and HYSPLIT is demonstrated. The complement of Aeolus data products will improve the accuracy of dust horizontal flux estimations and contribute to the research on the dust fertilization impacts on the primary productivity of oceans.
07 Apr 2021
Roles of the Inner Eyewall Structure in the Secondary Eyewall Formation of Simulated Tropical Cyclones
Nannan Qin, Liguang Wu, and Qingyuan Liu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-147, https://doi.org/10.5194/acp-2021-147, 2021
Revised manuscript not accepted (discussion: closed, 8 comments)
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Understanding of the secondary eyewall formation is a critical issue to improve the prediction of tropical cyclone intensity. Numerical experiments are conducted to explore the roles of the inner eyewall structure in the secondary eyewall formation. It is found that the inner eyewall structure plays an important role in the secondary eyewall formation of the simulated tropical cyclone.
26 Mar 2021
Shift in seasonal snowpack melt-out date due to light-absorbing particles at a high-altitude site in Central Himalaya
Johan Ström, Jonas Svensson, Henri Honkanen, Eija Asmi, Nathaniel B. Dkhar, Shresth Tayal, Ved P. Sharma, Rakesh Hooda, Outi Meinander, Matti Leppäranta, Hans-Werner Jacobi, Heikki Lihavainen, and Antti Hyvärinen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-158, https://doi.org/10.5194/acp-2021-158, 2021
Revised manuscript not accepted (discussion: closed, 3 comments)
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Snow darkening in the Himalaya results from the deposition of different particles. Here we assess the change in the seasonal snow cover duration due to the presence of mineral dust and black carbon particles in the snow of Sunderdhunga valley, Central Himalaya, India. With the use of in situ weather station data, the snow melt-out date is estimated to be shifted ~13 days earlier due to the presence of the particles in the snow.
24 Mar 2021
Physical and chemical constraints on transformation and mass-increase of fine aerosols in northeast Asia
Saehee Lim, Meehye Lee, Paolo Laj, Sang-Woo Kim, Kang-Ho Ahn, Junsoo Gil, Xiaona Shang, Marco Zanatta, and Kyeong-Sik Kang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-1247, https://doi.org/10.5194/acp-2020-1247, 2021
Preprint withdrawn (discussion: closed, 5 comments)
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This study identifies the main drivers of the formation and transformation processes of submicron particles and highlights that the thick coating of rBC was a result of active conversion of hygroscopic inorganic salts leading to fine aerosol pollution. Consequently, we suggest BC particles as a key contributor to PM2.5 mass increase, which implies that BC reduction is an effective mitigation against haze pollution as well as climate change in Northeast Asia.
25 Feb 2021
Observational study for strong downslope wind event under fine weather
condition during ICE-POP 2018
Chia-Lun Tsai, Kwonil Kim, Yu-Chieng Liou, Jung-Hoon Kim, YongHee Lee, and GyuWon Lee
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-100, https://doi.org/10.5194/acp-2021-100, 2021
Preprint withdrawn (discussion: closed, 4 comments)
Short summary
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This study examines a strong downslope wind event during ICE-POP 2018 using Doppler lidars, and observations. 3D winds can be well retrieved by
WISSDOM. This is first time to document the mechanisms of strong wind in observational aspect under fine weather. The PGF causing by adiabatic warming and channeling effect are key factors to dominate the strong wind. The values of this study are improving our understanding of the strong wind and increase the predictability of the weather forecast.
11 Feb 2021
Intercomparison of wind observations from ESA's satellite mission
Aeolus, ERA5 reanalysis and radiosonde over China
Boming Liu, Jianping Guo, Wei Gong, Yong Zhang, Lijuan Shi, Yingying Ma, Jian Li, Xiaoran Guo, Ad Stoffelen, Gerrit de Leeuw, and Xiaofeng Xu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-41, https://doi.org/10.5194/acp-2021-41, 2021
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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Vertical wind profiles are crucial to a wide range of atmospheric disciplines. Aeolus is the first satellite mission to directly observe wind profile information on a global scale. However, Aeolus wind products over China were thus far not evaluated by in-situ comparison. This work is expected to let the public and science community better know the Aeolus wind products and to encourage use of these valuable data in future researches and applications.
04 Feb 2021
Climatology of migrating and non-migrating tides observed by three meteor radars in the southern equatorial region
Jianyuan Wang, Wen Yi, Jianfei Wu, Tingdi Chen, Xianghui Xue, Robert A. Vincent, Iain M. Reid, Paulo P. Batista, Ricardo A. Buriti, Toshitaka Tsuda, and Xiankang Dou
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-33, https://doi.org/10.5194/acp-2021-33, 2021
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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In this study, we report the climatology of migrating and non-migrating tides in mesopause winds estimated using multiyear observations from three meteor radars in the southern equatorial region. The results reveal that the climatological patterns of tidal amplitudes by meteor radars is similar to the Climatological Tidal Model of the Thermosphere (CTMT) results and the differences are mainly due to the effect of the stratospheric sudden warming (SSW) event.
04 Feb 2021
Energetic analysis of succinic acid in water droplets: insight into the
size-dependent solubility of atmospheric nanoparticles
Chuchu Chen, Xiaoxiang Wang, Kurt Binder, Mohammad Mehdi Ghahremanpour, David van der Spoel, Ulrich Pöschl, Hang Su, and Yafang Cheng
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-1329, https://doi.org/10.5194/acp-2020-1329, 2021
Publication in ACP not foreseen (discussion: closed, 3 comments)
Short summary
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Size dependence of succinic acid solvation in the nanoparticles is investigated based on the molecular dynamics (MD) simulation and energetic analysis. The results show a stronger surface preference and a weaker internal bulk volume solvation of succinic acid in the smaller droplets, which may explain the previously observed size-dependent phase-state of aerosol nanoparticles containing organic molecules, fundamentally promoting a better understanding of atmospheric aerosols.
29 Jan 2021
Dynamical and chemical processes contributing to ozone loss in
exceptional Arctic stratosphere winter-spring of 2020
Sergei P. Smyshlyaev, Pavel N. Vargin, Alexander N. Lukyanov, Natalia D. Tsvetkova, and Maxim A. Motsakov
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-11, https://doi.org/10.5194/acp-2021-11, 2021
Revised manuscript not accepted (discussion: closed, 8 comments)
Short summary
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The dynamical processes and changes in Arctic ozone during the winter-spring season 2019–2020 were analyzed using ozonesondes, reanalysis data and numerical experiments with chemistry-transport and trajectory models. The results of numerical experiments indicated that dynamical processes predominate in ozone loss, and the chemical ozone depletion is determined not only by heterogeneous processes on the surface of the polar stratospheric clouds, but by the gas-phase destruction as well.
22 Dec 2020
Measurement report: Spectral actinometry at SMEAR-Estonia
Andres Kuusk and Joel Kuusk
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-1173, https://doi.org/10.5194/acp-2020-1173, 2020
Publication in ACP not foreseen (discussion: closed, 3 comments)
Short summary
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Systematic spectral measurements of global and diffuse solar radiation have been carried out at SMEAR-Estonia research station in south east Estonia during vegetation period for 8 years. Spectral range 300–2160 nm, spectral resolution 3–16 nm. Unique data have been collected and quantitative description of the variability of the measured spectra is provided. Spectral actinometry supports the research program of ecosystem-atmosphere relation at SMEAR-Estonia.
11 Dec 2020
Estimates of mass absorption cross sections of black carbon for filter-based
absorption photometers in the Arctic
Sho Ohata, Tatsuhiro Mori, Yutaka Kondo, Sangeeta Sharma, Antti Hyvärinen, Elisabeth Andrews, Peter Tunved, Eija Asmi, John Backman, Henri Servomaa, Daniel Veber, Makoto Koike, Yugo Kanaya, Atsushi Yoshida, Nobuhiro Moteki, Yongjing Zhao, Junji Matsushita, and Naga Oshima
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-1190, https://doi.org/10.5194/acp-2020-1190, 2020
Preprint withdrawn (discussion: closed, 3 comments)
Short summary
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Reliable values of mass absorption cross sections (MAC) of black carbon (BC) are required to determine mass concentrations of BC at Arctic sites using different types of filter-based absorption photometers. We successfully estimated MAC values for these instruments through comparison with independent measurements of BC by continuous soot monitoring system called COSMOS. These MAC values are consistent with each other and applicable to study spatial and temporal variation of BC in the Arctic.
08 Dec 2020
Long-term measurements (2009–2015) of non-methane hydrocarbons
(NMHCs) in a megacity of China: implication for emission validation
and source control
Yarong Peng, Hongli Wang, Qian Wang, Shengao Jing, Jingyu An, Yaqin Gao, Cheng Huang, Rusha Yan, Haixia Dai, Tiantao Cheng, Qiang Zhang, Meng Li, Li Li, Shengrong Lou, Shikang Tao, Qinyao Hu, Jun Lu, and Changhong Chen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-1108, https://doi.org/10.5194/acp-2020-1108, 2020
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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The evolution of NMHCs emissions and the effectiveness of control measures were investigated based on long term measurements in a megacity of China. Discrepancies between measurements and emission inventories emphasized the need for emission validation both in speciation and sources. Varied trends of NMHCs speciation and sources suggested the differential effect of the past control measures, which provided new insights into future clean air policies in polluted region including China.
23 Nov 2020
Analysis of variability in divergence and turn-over induced by three
idealized convective systems with a 3D cloud resolving model
Edward Groot and Holger Tost
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-1142, https://doi.org/10.5194/acp-2020-1142, 2020
Publication in ACP not foreseen (discussion: closed, 4 comments)
Short summary
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Sensitivities and variability of upper tropospheric flow (~10 km height) resulting immediately and as a direct consequence of (thunder)storm activity have been modeled in detail down to resolutions of 100–200 m and explored for different (organisation/) storm types. It is shown that the amount of water condensation explains much of emerging variability in upper atmospheric flow. Part of the effects on the nearby upper atmospheric flow is suggested to be explained by (organisation/) storm type.
16 Nov 2020
Meteorological formation mechanism of regional transport in winter
heavy air pollution events in the middle Yangtze River area, China
Yongqing Bai, Tianliang Zhao, Yue Zhou, Jie Xiong, Weiyang Hu, Yao Gu, Lin Liu, Shaofei Kong, and Huang Zheng
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-708, https://doi.org/10.5194/acp-2020-708, 2020
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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Heavy air pollution over central China with regional transport of PM2.5 during January of 2015-2019 were studied by using MV-EOF with multi-source observation data. It is revealed that the 3-D meteorological structure biulding a receptor region in regional transport of air pollutants over China for improving our our understanding on meteorological mechanism of regional transport of source-receptor air pollutants.
03 Nov 2020
Contribution of air-mass transport via the South Asia High to
the deep stratosphere in summer
Yu Liu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-990, https://doi.org/10.5194/acp-2020-990, 2020
Revised manuscript not accepted (discussion: closed, 6 comments)
Short summary
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In order to aviod uncertainty in the estimatione of contribution of air-mass transport from the South Asia High (SAH) to the deep stratosphere, I proposed a new method. Results show that the SAH is the most important air-mass transport pathway from the troposphere to the deep stratosphere in summer. This suggests that the impact of pollutants from Asia on the stratosphere is greater than that reported by previous studies.
02 Nov 2020
Dust emission in farmland caused by aerodynamic entrainment and
surface renewal
Hongchao Dun and Ning Huang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-1021, https://doi.org/10.5194/acp-2020-1021, 2020
Revised manuscript not accepted (discussion: closed, 4 comments)
27 Oct 2020
Study of second-order wind statistics in the mesosphere and lower
thermosphere region from multistatic specular meteor radar
observations during the SIMONe 2018 campaign
Harikrishnan Charuvil Asokan, Jorge L. Chau, Raffaele Marino, Juha Vierinen, Fabio Vargas, Juan Miguel Urco, Matthias Clahsen, and Christoph Jacobi
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-974, https://doi.org/10.5194/acp-2020-974, 2020
Preprint withdrawn (discussion: closed, 11 comments)
Short summary
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This paper explores the dynamics of gravity waves and turbulence present in the mesosphere and lower thermosphere (MLT) region. We utilized two different techniques on meteor radar observations and simulations to obtain power spectra at different horizontal scales. The techniques are applied to a special campaign conducted in northern Germany in November 2018. The study revealed the dominance of large-scale structures with horizontal scales larger than 500 km during the campaign period.
27 Oct 2020
Seasonal characteristics of emission, distribution and radiative effect of marine organic aerosols
over the western Pacific Ocean: an analysis combining observations with regional modeling
Jiawei Li, Zhiwei Han, Pingqing Fu, and Xiaohong Yao
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-1016, https://doi.org/10.5194/acp-2020-1016, 2020
Revised manuscript not accepted (discussion: closed, 3 comments)
Short summary
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Organic aerosols of marine origin are so far poorly understood. An on-line coupled regional chemistry-climate model is developed to firstly explore and characterize the seasonality and annual feature of emission, distribution and radiative effects of marine organic aerosols specifically for the western Pacific over East Asia. This study reveals an important role of marine organic aerosols in radiation and cloud and would be valuable for climate research at both regional and global scales.
27 Oct 2020
Departure from K-theory in the planetary boundary layer
Pedro Santos, Alfredo Peña, and Jakob Mann
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-960, https://doi.org/10.5194/acp-2020-960, 2020
Preprint withdrawn (discussion: closed, 3 comments)
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We show that the vector of vertical flux of horizontal momentum and the vector of the mean vertical gradient of horizontal velocity are not aligned, based on Doppler wind lidar observations up to 500 m, both offshore and onshore. We illustrate that a mesoscale model output matches the observed mean wind speed and momentum fluxes well, but that this model output as well as idealized large-eddy simulations have deviations with the observations when looking at the turning of the wind.
22 Oct 2020
An Estimate of Global, Regional and Seasonal Cirrus Cloud
Radiative Effects Contributed by Homogeneous Ice Nucleation
David L. Mitchell, John Mejia, Anne Garnier, Yuta Tomii, Martina Krämer, and Farnaz Hosseinpour
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-846, https://doi.org/10.5194/acp-2020-846, 2020
Publication in ACP not foreseen (discussion: closed, 3 comments)
Short summary
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This may be the first estimate of the radiative contribution of homogeneous ice nucleation in cirrus clouds on a global, regional and seasonal scale. This is achieved by constraining an atmospheric global climate model with measured cirrus cloud properties via satellite remote sensing. The results show that the overall radiative warming contributed by homogeneous ice nucleation at the top of the atmosphere is 2.4 W m-2 outside the ± 30° latitude zone during non-summer months (JJA).
21 Oct 2020
Mesoscale simulations of tropical cyclone Enawo (March 2017)
and its impact on TTL water vapor
Damien Héron, Stephanie Evan, Joris Pianezze, Thibaut Dauhut, Jerome Brioude, Karen Rosenlof, Vincent Noel, Soline Bielli, Christelle Barthe, and Jean-Pierre Cammas
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-870, https://doi.org/10.5194/acp-2020-870, 2020
Publication in ACP not foreseen (discussion: closed, 3 comments)
Short summary
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Upward transport within tropical cyclones of water vapor from the low troposphere into the colder upper troposphere/lower stratosphere can result in the moistening of this region. Balloon observations and model simulations of tropical cyclone Enawo in the less-observed Southwest Indian Ocean (the third most tropical cyclone active region on Earth) are used to show how convective overshoots within Enawo penetrate the tropopause directly, injecting water/ice into the stratosphere.
12 Oct 2020
Global aeolian dust variations and trends: a revisit of dust event and visibility observations from surface weather stations
Xin Xi
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-813, https://doi.org/10.5194/acp-2020-813, 2020
Preprint withdrawn (discussion: closed, 6 comments)
07 Oct 2020
Estimating daily full-coverage and high-accuracy 5-km ambient particulate matters across China: considering their precursors and chemical compositions
Yuan Wang, Qiangqiang Yuan, Tongwen Li, Siyu Tan, and Liangpei Zhang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-1004, https://doi.org/10.5194/acp-2020-1004, 2020
Revised manuscript not accepted (discussion: closed, 6 comments)
Short summary
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Estimating ambient PM2.5 and PM10 considering their precursors and chemical compositions instead of AOD products; Both remote sensing (Sentinel-5P) and assimilated data (GEOS-FP) are adopted; Sample-based Cross-Validation R2s and RMSEs are 0.93 (0.9) and 8.982 (17.604) μg/m3 for PM2.5 (PM10), respectively; Achieving better performance compared to the baseline (AOD-based) in different cases (e.g., overall and seasonal).
10 Sep 2020
Implementing Gas-to-Particle Partitioning of Semi-Volatile Inorganic Compounds in UCLALES-SALSA
Innocent Kudzotsa, Harri Kokkola, Juha Tonttila, Tomi Raatikainen, and Sami Romakkaniemi
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-851, https://doi.org/10.5194/acp-2020-851, 2020
Publication in ACP not foreseen (discussion: closed, 4 comments)
10 Sep 2020
Exploration of the atmospheric chemistry of nitrous acid in a coastal city of southeastern China: Results from measurements across four seasons
Baoye Hu, Jun Duan, Youwei Hong, Lingling Xu, Mengren Li, Yahui Bian, Min Qin, Wu Fang, Pinhua Xie, and Jinsheng Chen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-880, https://doi.org/10.5194/acp-2020-880, 2020
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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There has been a lack of research into HONO in coastal cities with low concentrations of NOx and PM2.5, but strong sunlight and high humidity. Insufficient research on coastal cities with good air quality has resulted in certain obstacles to assessing the photochemical processes in these areas. Furthermore, HONO contributes to the atmospheric photochemistry depending on the season. Therefore, observations of HONO across four seasons in the southeastern coastal area of China are urgently needed.
31 Aug 2020
On the relationship between tropospheric CO and CO2 during KORUS-AQ
and its role in constraining anthropogenic CO2
Wenfu Tang, Benjamin Gaubert, Louisa Emmons, Yonghoon Choi, Joshua P. DiGangi, Glenn S. Diskin, Xiaomei Xu, Cenlin He, Helen Worden, Simone Tilmes, Rebecca Buchholz, Hannah S. Halliday, and Avelino F. Arellano
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-864, https://doi.org/10.5194/acp-2020-864, 2020
Revised manuscript not accepted (discussion: closed, 6 comments)
Short summary
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A specific demonstration of the potential use of correlative information from carbon monoxide to refine estimates of regional carbon dioxide emissions from fossil fuel combustion.
31 Aug 2020
Improvement of inorganic aerosol component in PM2.5 by constraining aqueous-phase formation of sulfate in cloud with satellite retrievals: WRF-Chem simulations
Tong Sha, Xiaoyan Ma, Jun Wang, Rong Tian, Jianqi Zhao, Fang Cao, and Yan-Lin Zhang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-760, https://doi.org/10.5194/acp-2020-760, 2020
Preprint withdrawn (discussion: closed, 6 comments)
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Most numerical models perform poorly on simulating the inorganic chemical components in PM2.5 (sulfate, nitrate, and ammonium (SNA)), generally underestimate sulfate but overestimate nitrate concentrations in haze events. Our work aims at investigating the role of cloud water in simulating SNA. We find that the uncertainties of cloud water can lead to model bias in simulating SNA, and can be reduced by constraining the modeled cloud water with MODIS satellite observations.
31 Aug 2020
Aqueous phase oxidation of bisulfite influenced by nitrate photolysis
Lu Chen, Lingdong Kong, Songying Tong, Kejing Yang, Shengyan Jin, Chao Wang, and Lin Wang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-806, https://doi.org/10.5194/acp-2020-806, 2020
Revised manuscript not accepted (discussion: closed, 5 comments)
Short summary
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The role of nitrate aerosol in atmospheric SO2 oxidation remains unclear. We investigated the effects of nitrate on the aqueous phase oxidation of bisulfite under different conditions. We found the important roles of nitrate photolysis, pH, ammonium and O2 in the oxidation of bisulfite to sulfate, the generation of H2O2, and the synergism with halogen chemistry. These results provide a new insight into the heterogeneous aqueous phase oxidation of SO2 in cloud and fog droplets and haze particles.
27 Aug 2020
Evaluating the sensitivity of fine particulate matter (PM2.5) simulations to chemical mechanism in Delhi
Chinmay Jena, Sachin D. Ghude, Rachana Kulkarni, Sreyashi Debnath, Rajesh Kumar, Vijay Kumar Soni, Prodip Acharja, Santosh H. Kulkarni, Manoj Khare, Akshara J. Kaginalkar, Dilip M. Chate, Kaushar Ali, Ravi S. Nanjundiah, and Madhavan N. Rajeevan
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-673, https://doi.org/10.5194/acp-2020-673, 2020
Publication in ACP not foreseen (discussion: closed, 2 comments)
Short summary
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Simulations of atmospheric particulate matter (PM2.5) with WRF-Chem model with three different aerosol mechanisms coupled with gas-phase chemical schemes are compared to understand the spatial and temporal variability of PM2.5 over the Indo-Gangetic Plain (IGP) in the winter season. All three chemical schemes underestimate the observed concentrations of major aerosol composition and precursor gases over IGP which in turn affect the optical depth and overall performance of the model for PM2.5.
25 Aug 2020
Organized Variations in MBL Cloud Microphysical Properties Observed by Aircraft and Satellite and Simulated by Model
Dale M. Ward, Xiquan Dong, Baike Xi, Peng Wu, Xiaojian Zheng, and Yuan Wang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-817, https://doi.org/10.5194/acp-2020-817, 2020
Preprint withdrawn (discussion: closed, 2 comments)
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Marine boundary layer clouds in subtropical regions strongly impact global energy balance, but complete understanding of the processes that control their development remain elusive. We analyze aircraft in-situ measurements of clouds collected in a field campaign for cases that contain organized structures tens of kilometres in extent embedded within a larger overcast cloud field. Failure to account for these structures can lead to misrepresentation in models and satellite retrievals.
24 Aug 2020
Occurrence of discontinuities in the ozone concentration data from three reanalyses
Peter Krizan, Michal Kozubek, and Jan Lastovicka
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-551, https://doi.org/10.5194/acp-2020-551, 2020
Publication in ACP not foreseen (discussion: closed, 2 comments)
Short summary
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This paper is devoted to the occurrence of discontinuities in the ozone concentration data from the selected reanalyses, because they have large impact to the results of trend studies. The discontinuity occurrence is reanalyse dependant. The discontinuities frequently occur at the middle stratosphere and in the troposphere for a certain reanalyses. According our opinion, the reanalyses data can be used in trend studies especially in the lower stratosphere.
18 Aug 2020
Observed changes in the temperature dependence response of surface ozone under NOx reductions
Noelia Otero, Henning W. Rust, and Tim Butler
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-691, https://doi.org/10.5194/acp-2020-691, 2020
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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Surface ozone concentrations are strongly correlated with temperature in summertime. Using long-term measurements, we investigate changes in the observed relationship between ozone and temperature over Germany. We propose a new statistical approach based on Generalized Additive Models (GAMs) to describe ozone production rates as a function of nitrogen oxides (NOx) and temperature. Our results suggest that NOx reductions alone can not explain the changes in the temperature dependence of ozone.
12 Aug 2020
Influence of Saharan dust on Atlantic tropical cyclones
Zhenxi Zhang and Wen Zhou
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-761, https://doi.org/10.5194/acp-2020-761, 2020
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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The influence of Saharan dust outbreaks on summertime Atlantic tropical cyclone (TC) activity is explored using continuous atmospheric reanalysis products and TC track data from 1980 to 2019. Analyses reveal that the Saharan dust plume over the tropical Atlantic can affect TC activity by affecting the atmospheric hydrology and radiation absorbed by the earth's surface.
10 Aug 2020
Measurement Report: Size distributions of inorganic and organic components in particulate matter from a megacity in northern China: dependence upon seasons and pollution levels
Yingze Tian, Yinchang Feng, Yongli Liang, Yixuan Li, Qianqian Xue, Zongbo Shi, Jingsha Xu, and Roy M. Harrison
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-507, https://doi.org/10.5194/acp-2020-507, 2020
Revised manuscript not accepted (discussion: closed, 6 comments)
Short summary
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Size distributions of inorganic and organic components in particulate matter (PM) can provide critical information on sources and pollution processes. Ions, elements, carbon fractions, n-alkanes, PAHs, hopanes and steranes in size-resolved PM were analyzed during one year in a northern Chinese megacity. Results reveal that size distributions of inorganic and organic aerosol components are dependent on seasons and pollution levels as a result of differing sources and physicochemical processes.
27 Jul 2020
Biomass burning events measured by lidars in EARLINET. Part II. Results and discussions
Mariana Adam, Doina Nicolae, Livio Belegante, Iwona S. Stachlewska, Lucja Janicka, Dominika Szczepanik, Maria Mylonaki, Christiana Anna Papanikolaou, Nikos Siomos, Kalliopi Artemis Voudouri, Luca Alados-Arboledas, Juan Antonio Bravo-Aranda, Arnoud Apituley, Nikolaos Papagiannopoulos, Lucia Mona, Ina Mattis, Anatoli Chaikovsky, Michaël Sicard, Constantino Muñoz-Porcar, Aleksander Pietruczuk, Daniele Bortoli, Holger Baars, Ivan Grigorov, and Zahary Peshev
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-647, https://doi.org/10.5194/acp-2020-647, 2020
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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Results over 10 years of biomass burning events measured by EARLINET are analysed by means of the intensive parameters based on the methodology described in Part I. Smoke type is characterized for each of the four geographical regions based on continental smoke origin. Relationships between intensive parameters or colour ratios are shown. The smoke is labelled in average as aged smoke. The local smoke has a smaller lidar ratio while the depolarization is smaller for long range transported smoke.
21 Jul 2020
Fine particle pH and sensitivity to NH3 and HNO3 over summertime South Korea during KORUS-AQ
Ifayoyinsola Ibikunle, Andreas Beyersdorf, Pedro Campuzano-Jost, Chelsea Corr, John D. Crounse, Jack Dibb, Glenn Diskin, Greg Huey, Jose-Luis Jimenez, Michelle J. Kim, Benjamin A. Nault, Eric Scheuer, Alex Teng, Paul O. Wennberg, Bruce Anderson, James Crawford, Rodney Weber, and Athanasios Nenes
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-501, https://doi.org/10.5194/acp-2020-501, 2020
Publication in ACP not foreseen (discussion: closed, 8 comments)
Short summary
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Analysis of observations over South Korea during the NASA/NIER
KORUS-AQ field campaign show that aerosol is fairly acidic (mean pH 2.43 ± 0.68). Aerosol formation is always sensitive to HNO3 levels, especially in highly polluted regions, while it is only exclusively sensitive to NH3 in some rural/remote regions. Nitrate levels accumulate because dry deposition velocity is low. HNO3 reductions achieved by NOx controls can be the most effective PM reduction strategy for all conditions observed.
13 Jul 2020
An assessment of the impact of a nation-wide lockdown on air pollution – a remote sensing perspective over India
Mahesh Pathakoti, Aarathi Muppalla, Sayan Hazra, Mahalakshmi Dangeti, Raja Shekhar, Srinivasulu Jella, Sesha Sai Mullapudi, Prasad Andugulapati, and Uma Vijayasundaram
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-621, https://doi.org/10.5194/acp-2020-621, 2020
Revised manuscript not accepted (discussion: closed, 5 comments)
Short summary
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Present work carried out analysis of Air pollution over the Indian region in connection with nation's lockdown due to outbreak of COVID-19. We studied air pollutants namely NO2, CO and AOD using the remote sensing data. During the exhaustive 40 days of lock down in India, we observed significant reduction in air pollutants during lock down period compared to no lock down period. This study further shows the effect of lock down on short-term climatological variability of these pollutants.
08 Jul 2020
Black Carbon Seasonal and Diurnal Variation in surface
snow in Svalbard and its
Connections to Atmospheric Variables
Michele Bertò, David Cappelletti, Elena Barbaro, Cristiano Varin, Jean-Charles Gallet, Krzysztof Markowicz, Anna Rozwadowska, Mauro Mazzola, Stefano Crocchianti, Luisa Poto, Paolo Laj, Carlo Barbante, and Andrea Spolaor
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-574, https://doi.org/10.5194/acp-2020-574, 2020
Preprint withdrawn (discussion: closed, 2 comments)
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We present the daily and seasonal variability of Black carbon inferred from two specific experiment based on the hourly and daily time resolution sampling strategy. These unique datasets give us for the first time the opportunity to evaluate the associations between the observed surface snow rBC mass concentration and a set of predictors corresponding to the considered meteorological and snow physico-chemical parameters, via a multiple linear regression approach.
06 Jul 2020
Effect of NOX, O3 and NH3 on sulfur isotope composition during
heterogeneous oxidation of SO2: a laboratory investigation
Zhaobing Guo, Mingyi Xu, Yuxuan He, Shuo Gao, Chenmin Xu, Bin Zhu, Qingjun Guo, Xiaoyu Shen, Shuang Zhao, and Pengxiang Qiu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-506, https://doi.org/10.5194/acp-2020-506, 2020
Revised manuscript not accepted (discussion: closed, 7 comments)
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In order to gain insight into the formation mechanism of sulfate, stable sulfur isotope and Rayleigh distillation were applied to investigate the isotopic fractionations controlled by the oxidation pathways. The processes of SO2 oxidation on the surface of α-Fe2O3 with different chemical condition (NOX, O3 and NH3) were conducted in laboratory to study mechanism of SO2 oxidation. It was found that nitrogen oxides contributed primarily to the formation of sulfate among NOX, O3 and NH3 pathways.
01 Jul 2020
Seventeen years of ozone sounding at L'Aquila, Italy: evidence of mid-latitude stratospheric ozone recovery and tropospheric profile changes
Daniele Visioni, Giovanni Pitari, Vincenzo Rizi, Marco Iarlori, Irene Cionni, Ilaria Quaglia, Hideharu Akiyoshi, Slimane Bekki, Neal Butchart, Martin Chipperfield, Makoto Deushi, Sandip S. Dhomse, Rolando Garcia, Patrick Joeckel, Douglas Kinnison, Jean-François Lamarque, Marion Marchand, Martine Michou, Olaf Morgenstern, Tatsuya Nagashima, Fiona M. O'Connor, Luke D. Oman, David Plummer, Eugene Rozanov, David Saint-Martin, Robyn Schofield, John Scinocca, Andrea Stenke, Kane Stone, Kengo Sudo, Taichu Y. Tanaka, Simone Tilmes, Holger Tost, Yousuke Yamashita, and Guang Zeng
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-525, https://doi.org/10.5194/acp-2020-525, 2020
Preprint withdrawn (discussion: closed, 2 comments)
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In this work we analyse the trend in ozone profiles taken at L'Aquila (Italy, 42.4° N) for seventeen years, between 2000 and 2016 and compare them against already available measured ozone trends. We try to understand and explain the observed trends at various heights in light of the simulations from seventeen different model, highlighting the contribution of changes in circulation and chemical ozone loss during this time period.
01 Jul 2020
Measurement report: Immediate impact of the Taal volcanic eruption on atmospheric temperature observed from COSMIC-2 RO measurements
Saginela Ravindra Babu and Yuei-An Liou
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-513, https://doi.org/10.5194/acp-2020-513, 2020
Revised manuscript not accepted (discussion: closed, 4 comments)
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This is the first paper to utilize the high-resolution temperature measurements from the recently launched COSMIC-2 radio occultation data to delineate the detailed vertical structure and day-to-day temperature variability in response to the eruption of the Taal volcano in January 2020.
30 Jun 2020
Retrieval of microphysical dust particle properties from SALTRACE lidar observations: Case studies
Stefanos Samaras, Christine Böckmann, Moritz Haarig, Albert Ansmann, Adrian Walser, and Bernadett Weinzierl
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-459, https://doi.org/10.5194/acp-2020-459, 2020
Preprint withdrawn (discussion: closed, 3 comments)
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We retrieve microphysical properties of Saharan dust particles after a long-range transport over the Atlantic Ocean to Barbados using three depolarization channels of a Raman lidar. The retrievals are performed with a spheroidal software tool by regularization. For the first time we retrieve simultaneously a shape- and size-dependent particle distribution and compare it with the polarization lidar-photometer networking method, ground-based photometer and airborne in situ particle counter data.
08 Jun 2020
Impact of organic acids on chloride depletion of inland transported sea spray aerosols
Bojiang Su, Zeming Zhuo, Yuzhen Fu, Wei Sun, Ying Chen, Xubing Du, Yuxiang Yang, Si Wu, Fugui Huang, Duohong Chen, Lei Li, Guohua Zhang, Xinhui Bi, and Zhen Zhou
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-443, https://doi.org/10.5194/acp-2020-443, 2020
Revised manuscript not accepted (discussion: closed, 3 comments)
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In this study, chemical composition, mixing state and aging degree of individual sea spray aerosol (SSA) were measured by single particle aerosol mass spectrometer (SPAMS) during summer monsoon in southern China. Our results show that organic acids has significant contribution to chloride depletion of SSA. A class of biological SSA underwent relative weak chloride depletion compare to other SSA types, which may attribute to organic species (i.e. organic nitrogen and biological phosphate).
26 May 2020
A set of methods to quantitatively evaluate the below-cloud evaporation effect on precipitation isotopic composition: a case study in a city located in the semi-arid regions of Chinese Loess Plateau
Meng Xing, Weiguo Liu, and Jing Hu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-312, https://doi.org/10.5194/acp-2020-312, 2020
Preprint withdrawn (discussion: closed, 2 comments)
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Our results proved that below-cloud (BC) evaporation is the dominant BC processes in our study regions,reminding us to cautiously use the precipitation isotopic results;the impact of BC evaporation on the snowfall samples is weak,enhancing the confidence by using ice-cores to reconstruct the paleoclimates;and the isotopic method is more suitable to compute the evaporation remaining fraction in the high latitude areas,helping us to better evaluate the hydrological cycling processes.
25 May 2020
Biomass burning aerosols in the southern hemispheric midlatitudes as observed with a multiwavelength polarization Raman lidar
Athena Augusta Floutsi, Holger Baars, Martin Radenz, Moritz Haarig, Zhenping Yin, Patric Seifert, Cristofer Jimenez, Ulla Wandinger, Ronny Engelmann, Boris Barja, Felix Zamorano, and Albert Ansmann
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-453, https://doi.org/10.5194/acp-2020-453, 2020
Preprint withdrawn (discussion: closed, 5 comments)
07 May 2020
Transport model diagnosis of the mean age of air derived from stratospheric samples in the tropics
Hanh T. Nguyen, Kentaro Ishijima, Satoshi Sugawara, and Fumio Hasebe
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-380, https://doi.org/10.5194/acp-2020-380, 2020
Revised manuscript not accepted (discussion: closed, 4 comments)
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The velocity of stratospheric circulation is often measured by the time since the air entered the stratosphere. This study tries to understand its vertical profile in the tropics by comparing observational data and model simulations. Our interpretation mutually consistent among them is encouraging, while some limitations such as the treatment of seasonal variation of CO2 and mesospheric loss of SF6 are reconfirmed stressing a need of using multiple variables in the future.
05 May 2020
On the spatial variability of the regional aerosol distribution as
determined from ceilometers
Matthias Wiegner, Alexander Geiß, Ina Mattis, Fred Meier, and Thomas Ruhtz
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-332, https://doi.org/10.5194/acp-2020-332, 2020
Publication in ACP not foreseen (discussion: closed, 4 comments)
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We investigated ceilometer signals from 2 testbeds in Munich and Berlin, Germany, with respect to their representativeness. For each testbed data of 24 months from 6 ceilometers were available. Two parameters were discussed: the mixing layer height (MLH) as an indicator for the vertical distribution and the integrated backscatter as a proxy for the amount of aerosols in the mixing layer. We found that only the MLH determined from a single ceilometer is applicable for a whole metropolitan area.
23 Apr 2020
Kinetics of dimethyl sulfide (DMS) reactions with isoprene-derived Criegee intermediates studied with direct UV absorption
Mei-Tsan Kuo, Isabelle Weber, Christa Fittschen, and Jim Jr-Min Lin
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-326, https://doi.org/10.5194/acp-2020-326, 2020
Preprint withdrawn (discussion: closed, 2 comments)
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Dimethyl sulfide (DMS) is the major sulfur-containing species in the troposphere. Previous work by Newland et al. [Atmos. Chem. Phys., 15, 9521–9536, 2015] reported very high reactivity of isoprene-derived Criegee intermediates (CIs) towards DMS. By monitoring CIs with direct UV absorption, we found CI + DMS reactions are very slow, in contrast to the results of Newland et al., suggesting these CIs would not oxidize atmospheric DMS at any substantial level.
22 Apr 2020
The trend of the oxidants in boreal forest over 2007–2018: comprehensive modelling study with long-term measurements at SMEAR II, Finland
Dean Chen, Putian Zhou, Tuomo Nieminen, Pontus Roldin, Ximeng Qi, Petri Clusius, Carlton Xavier, Lukas Pichelstorfer, Markku Kulmala, Pekka Rantala, Juho Aalto, Nina Sarnela, Pasi Kolari, Petri Keronen, Matti P. Rissanen, Metin Baykara, and Michael Boy
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-128, https://doi.org/10.5194/acp-2020-128, 2020
Preprint withdrawn (discussion: closed, 4 comments)
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Atmospheric oxidants OH, O3 and NO3 dominate the atmospheric oxidation capacity, and sulfuric acid (H2SO4) is considered as a main driver for new particle formation events. We studied how the trends of these atmospheric oxidants and H2SO4 changed in southern Finland during the past 12 years and discussed how these trends related to decreasing emissions of air pollutants in Europe. Our results showed that OH increased by 1.56 % yr−1 at daytime and NO3 decreased by 3.92 % yr−1 at nighttime.
21 Apr 2020
Investigating emission sources and transport of aerosols in Siberia using airborne and spaceborne LIDAR measurements
Antonin Zabukovec, Gerard Ancellet, Iwan E. Penner, Mikhail Arshinov, Valery Kozlov, Jacques Pelon, Jean-Daniel Paris, Grigory Kokhanenko, Yuri S. Balin, Dmitry Chernov, and Boris D. Belan
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-195, https://doi.org/10.5194/acp-2020-195, 2020
Preprint withdrawn (discussion: closed, 4 comments)
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Description of two aircraft campaigns results carried out over Siberia in 2013 and 2017 to characterize aerosol emission. A methodology is proposed to derive the aerosol types using transport model and satellite observations. The extinction to backscatter ratio for each aerosol types is reported as it is a key parameter to constrain their radiative impact. These results are compared to previous work conducted in other regions and to aerosol data products observed by spaceborne lidars.
20 Apr 2020
A plasmachemical axially symmetric self-consistent model of daytime sprite
Andrey Evtushenko, Fedor Kuterin, and Ekaterina Svechnikova
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-1196, https://doi.org/10.5194/acp-2019-1196, 2020
Revised manuscript not accepted (discussion: closed, 3 comments)
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The paper presents the results of self-consistent axially symmetric modelling of a daytime sprite. Perturbations of the concentrations of ions, neutral compounds, excited atoms and molecules along with disturbances of the electric field are studied.
The possibility of the initiation of a daytime sprite by an extremely intense lightning discharge leading to a significant long-term perturbation of atmospheric chemical balance is demonstrated.
17 Apr 2020
Measurement report: Characteristics and sources of non-methane VOCs and their roles in SOA formation during autumn in a central Chinese city
Haixu Zhang, Chunrong Chen, Weijia Yan, Nana Wu, Yu Bo, Qiang Zhang, and Kebin He
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-280, https://doi.org/10.5194/acp-2020-280, 2020
Revised manuscript not accepted (discussion: closed, 3 comments)
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In this work, we provide first-hand information on VOC characters in a central Chinese city. Although benzenoids has the largest SOA formation potential, their weight decline with the aggravation of pollution, while the role of VOCs as oxidant producers of SOA formation is critical, especially in hazy periods. Furthermore, solvent evaporation is estimated as the top source for SOA formation considering the above dual roles of VOCs, which would assist to mitigate pollution in China.
14 Apr 2020
Using a global network of temperature lidars to identify temperature biases in the upper stratosphere in ECMWF reanalyses
Graeme Marlton, Andrew Charlton-Perez, Giles Harrison, Inna Polichtchouk, Alain Hauchecorne, Philippe Keckhut, and Robin Wing
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-254, https://doi.org/10.5194/acp-2020-254, 2020
Preprint withdrawn (discussion: closed, 1 comment)
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A network of Rayleigh lidars have been used to infer the middle atmosphere temperature bias in ECMWF ERA-5 and ERA-interim reanalyses during 1990–2017. Results show that ERA-interim exhibits a cold bias of −3 to −4 K between 10 and 1 hPa. Comparisons with ERA-5 found a smaller bias of 1 K which varies between cold and warm between 10 and 3 hPa, indicating a good thermal representation of the atmosphere to 3 hPa. These biases must be accounted for in stratospheric studies using these reanalyses.
25 Mar 2020
Do large-scale wind farms affect air quality forecast? Modeling evidence in Northern China
Si Li, Tao Huang, Jingyue Mo, Jixiang Li, Xiaodong Zhang, Jiao Du, Shu Tao, Junfeng Liu, Wanyanhan Jiang, Lulu Lian, Hong Gao, Xiaoxuan Mao, Yuan Zhao, and Jianmin Ma
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-991, https://doi.org/10.5194/acp-2019-991, 2020
Revised manuscript not accepted (discussion: closed, 6 comments)
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Wind power provides clean energy and gets rapid development worldwide in the past decades, which helps to reduce air pollutants and CO2 emissions. This study shows that, because wind farm alters underlying surface characteristics and spinning turbine rotors generate atmospheric turbulence, the altered winds and temperatures forced by turbulence affect transport and diffusion of air pollutants near and hundreds km downstream of the wind farm, bringing uncertainties to the air quality forecast.
23 Mar 2020
Sensitivity of WRF-Chem model resolution in simulating particulate matter in South-East Asia
Adedayo Rasak Adedeji, Lalit Dagar, Mohammad Iskandar Petra, Liyanage C. De Silva, and Zhining Tao
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-692, https://doi.org/10.5194/acp-2019-692, 2020
Publication in ACP not foreseen (discussion: closed, 5 comments)
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We have simulated the particulate matter levels and distribution during the haze event across the Southeast Asia region in June 2013, caused mainly by the intense biomass burning emissions. We analyzed the response of meteorology and particulate matter simulation to horizontal grid resolutions, and the relative positioning of station to variable staggering on grids. Also, the simulations emphasized the requirement of biomass burning enhancements in the WRF-Chem model.
06 Mar 2020
Finely laminated Arctic mixed-phase clouds occur frequently and are correlated with snow
Emily M. McCullough, Robin Wing, and James R. Drummond
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-186, https://doi.org/10.5194/acp-2020-186, 2020
Revised manuscript not accepted (discussion: closed, 3 comments)
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Very thin (< 10 m) laminations in Arctic mixed phase clouds are detected at Eureka, Nunavut on 52 % of measured days, and 62 % of cloudy measured days during a 3.5-year study by the CANDAC Rayleigh-Mie-Raman lidar (CRL) at the Polar Environment Atmospheric Research Laboratory (PEARL). Precipitating snow reported by Environment and Climate Change Canada is strongly correlated with laminated clouds, and anti-correlated with non-laminated clouds, yielding constraints on precipitation formation.
25 Feb 2020
Defining aerosol layer height for UVAI interpretation using aerosol vertical distributions characterized by MERRA-2
Jiyunting Sun, J. Pepijn Veefkind, Peter van Velthoven, L. Gijsbert Tilstra, Julien Chimot, Swadhin Nanda, and Pieternel F. Levelt
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-39, https://doi.org/10.5194/acp-2020-39, 2020
Revised manuscript not accepted (discussion: closed, 4 comments)
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ALH is one of the major concerns in quantifying aerosol absorption from the ultra-violet aerosol index (UVAI). The UVAI has a global daily record since 1978, whereas a corresponding ALH data set is limited. In this paper, we attempt to construct a global long-term ALH data set derived from the MERRA-2 aerosol fields that can be favorable in interpreting aerosol absorption from UVAI. We also give comments on several satellite ALH products in terms of the UVAI altitude dependence.
25 Feb 2020
The consistency between observations (TCCON, surface measurements and satellites) and CO2 models in reproducing global CO2 growth rate
Lev D. Labzovskii, Samuel Takele Kenea, Jinwon Kim, Haeyoung Lee, Shanlan Li, Young-Hwa Byun, Tae-Young Goo, and Young-Suk Oh
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-114, https://doi.org/10.5194/acp-2020-114, 2020
Revised manuscript not accepted (discussion: closed, 8 comments)
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Global CO2 growth rate is a key indicator of the balance between carbon sources and sinks but there are few observational methods to quantify this rate. We proved that the estimates of global CO2 growth rate are consistent across wide range of data sources. This finding is essential given recently shown disagreement between CO2 models in simulating global CO2 growth rate, lack of consensus about the method for quantifying this rate and dearth of observational methods to infer global CO2 growth.
20 Feb 2020
Role of black carbon in the formation of primary organic aerosols: Insights from molecular dynamics simulations
Xiaoqi Zhou, Yulu Zhou, Sylvain Picaud, Michel Devel, Jesús Carrete, Georg K. H. Madsen, and Zhao Wang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-81, https://doi.org/10.5194/acp-2020-81, 2020
Revised manuscript not accepted (discussion: closed, 5 comments)
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Molecular simulations confirm the catalytic role of black carbon precursors in the primary formation of aerosols from VOCs. Aromatic and aliphatic compounds are found to exhibit different clustering manners that lead to differences in the thermal stability of the formed PMs. A layer-by-layer formation process is also suggested in keeping with experimental measurements. These results shed light on the microscopic mechanisms of the formation of primary organic aerosol PMs.
17 Feb 2020
Mixing state of black carbon and its impact on optical properties and radiative forcing over East Asia
Xiaoyan Ma, Hailing Jia, Rong Tian, Fangqun Yu, and Jiagnan Li
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-54, https://doi.org/10.5194/acp-2020-54, 2020
Preprint withdrawn (discussion: closed, 2 comments)
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BC Mixing state, is one of critical microphysical properties to modulate optical properties, radiative forcing (RF), and climatic effect. However, it has been simply assumed previously as either external or internal mixing. In this study, by employing a nested GEOS-Chem-APM with predicted BC mixing state, we examined the effect of mixing state on aerosol optical properties, RF, and heating rate over East Asia. This will improve the predictions of aerosol climatic effect in the future.
04 Feb 2020
Chemical characteristics of PM2.5: Impact of biomass burning at an agricultural site of the North China Plain during a season of transition
Linlin Liang, Guenter Engling, Chang Liu, Wanyun Xu, Xuyan Liu, Yuan Cheng, Zhenyu Du, Gen Zhang, Junying Sun, and Xiaoye Zhang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-19, https://doi.org/10.5194/acp-2020-19, 2020
Revised manuscript not accepted (discussion: closed, 4 comments)
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Our study captured an episode with extreme biomass burning tracer level at an agricultural site in North China, with concentrations of levoglucosan as high as 4.37 μg m−3. Based on comparison of the chemical composition between different biomass burning periods, it appeared that biomass burning can obviously elevate the levels of organic components, but seems to have no significant effect on the production of secondary inorganic ions, although their precursors increased during the episode.
03 Feb 2020
Long-term energy and CO2 flux observations over an agricultural field in southeastern Tibetan Plateau
Anlun Xu and Jian Li
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-1131, https://doi.org/10.5194/acp-2019-1131, 2020
Revised manuscript not accepted (discussion: closed, 4 comments)
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Based on 12-year eddy covariance measurement over an agricultural field, we investigated the diurnal, seasonal and inter-annual changes in sensible heat flux, latent heat flux and carbon dioxide flux and their meteorological controls on multiple timescales. We found that each control has distinct effect on turbulent heat and dioxide flux over different temporal scales. Our results are useful for improving the numerical modelling of physical atmosphere-land processes over the complex terrain.
29 Jan 2020
A 10-year climatology of globally distributed ice cloud properties inferred from the CALIPSO observations
Honglin Pan, Xinghua Yang, Kanike Raghavendra Kumar, Ali Mamtimin, Minzhong Wang, Chenglong Zhou, Fan Yang, Wen Hou, Chaofan Li, Jiantao Zhang, and Lu Meng
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-1116, https://doi.org/10.5194/acp-2019-1116, 2020
Revised manuscript not accepted (discussion: closed, 4 comments)
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Among several active remote sensors, the CALIPSO instrument can better observe the vertical structure of ice clouds and as well as its diurnal changes. Here, we studied the climatology (2007–2016) of spatiotemporal and vertical distributions characteristics of ice clouds for three ice cloud categories (sub-visual, thin, and opaque) based on the CALIPSO data. The mean profiles of diurnal variability for the ice clouds and relationship with meteorological variables were also investigated.
24 Jan 2020
Triplet State Formation of Chromophoric Dissolved Organic Matter in Atmospheric Aerosols: Characteristics and Implications
Qingcai Chen, Zhen Mu, Li Xu, Mamin Wang, Jin Wang, Ming Shan, Xudong Yang, Xingjun Fan, Jianzhong Song, Yuqin Wang, Pengchuan Lin, Lixin Zhang, Zhenxing Shen, and Lin Du
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-1032, https://doi.org/10.5194/acp-2019-1032, 2020
Preprint withdrawn (discussion: closed, 4 comments)
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It is important to study the formation characteristics and mechanism of triplet state in aerosols to quantify the effect of chromophore substances on the global climate and atmospheric environmental quality. The result of this study reveals that chromophore substances contributes significantly to aerosol photochemistry and plays an important role in aerosol aging. The global models may need to include those potential effects in the future.
14 Jan 2020
Amine and guanidine emissions from a boreal forest floor
Marja Hemmilä, Ulla Makkonen, Aki Virkkula, Georgia Panagiotopoulou, Juho Aalto, Markku Kulmala, Tuukka Petäjä, Hannele Hakola, and Heidi Hellén
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-1157, https://doi.org/10.5194/acp-2019-1157, 2020
Publication in ACP not foreseen (discussion: closed, 2 comments)
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Amines are atmospheric bases, which can affect to nucleation of aerosols. Lately, a computational study showed that guanidine could be even more effective to stabilize sulphuric acid clusters. In this paper we used a a dynamic flow-through chamber with an online ion chromatograph MARGA coupled with a mass spectrometer (MARGA-MS). We studied amine and guanidine emission from a boreal forest floor in Finland, and find out, that the boreal forest floor is a source of amines and guanidine.
13 Jan 2020
Year-round record of near-surface ozone and O3 enhancement events(OEEs) at Dome A, East Antarctica
Minghu Ding, Biao Tian, Michael Ashley, Zhenxi Zhu, Lifan Wang, Shihai Yang, Chuanjin Li, Cunde Xiao, and Dahe Qin
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-1042, https://doi.org/10.5194/acp-2019-1042, 2020
Revised manuscript not accepted (discussion: closed, 9 comments)
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In 2016, the first observation of near-surface ozone was made at Dome A, the inaccessible pole. And based on the ERA-interim meteorological reanalysis data, we clearly found that there was strong transportation from stratosphere to troposphere during polar night at Dome A. This work provides unique information of ozone variation in Dome A and expands our knowledge in Antarctica.
18 Dec 2019
Statistical characteristics of raindrop size distribution over Western Ghats of India: wet versus dry spells of Indian Summer Monsoon
Uriya Veerendra Murali Krishna, Subrata Kumar Das, Ezhilarasi Govindaraj Sulochana, Bhowmik Utsav, Sachin Madhukar Deshpande, and Govindan Pandithurai
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-832, https://doi.org/10.5194/acp-2019-832, 2019
Revised manuscript not accepted (discussion: closed, 4 comments)
16 Dec 2019
The role of HONO in O3 formation and insight into its formation mechanism during the KORUS-AQ Campaign
Junsu Gil, Jeonghwan Kim, Meehye Lee, Gangwoong Lee, Dongsoo Lee, Jinsang Jung, Joonyeong An, Jinkyu Hong, Seogju Cho, Jeonghoon Lee, and Russell Long
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-1012, https://doi.org/10.5194/acp-2019-1012, 2019
Preprint withdrawn (discussion: closed, 6 comments)
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During the KORUS-AQ campaign, nitrous acid (HONO) concentrations in Seoul were higher in high-O3 episodes than non-episodes. The photochemical model simulation demonstrates the role of HONO in promoting O3 formation through OH production and subsequent VOCs oxidation. The ambient HONO concentrations were reasonably represented by an Artificial Neural Network model, highlighting NOx, surface area, and relative humidity as crucial parameters for HONO formation in Seoul under high NOx conditions.
03 Dec 2019
Effects of Liquid Phase Cloud Microphysical Processes in Mixed Phase Cumulus Clouds over the Tibetan Plateau
Xiaoqi Xu, Chunsong Lu, Yangang Liu, Wenhua Gao, Yuan Wang, Yueming Cheng, Shi Luo, and Kwinten Van Weverberg
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-1063, https://doi.org/10.5194/acp-2019-1063, 2019
Preprint withdrawn (discussion: closed, 4 comments)
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A typical summer plateau precipitation event was simulated with the WRF model by introducing different parameterizations of liquid-phase microphysical processes and found that the low resolution is one reason responsible for the overprediction of precipitation over the Tibet Plateau. The inaccurate parameterization of accretion is another reason. It is critical to consider rain and cloud drop sizes in accretion parameterizations, which can suppress artificial accretion when drops are too small.
03 Dec 2019
The complex origin and spatial distribution of non-pure sulfate particles (NSPs) in the stratosphere
Jean-Baptiste Renard, Gwenaël Berthet, Anny-Chantal Levasseur-Regourd, Sergey Beresnev, Alain Miffre, Patrick Rairoux, Damien Vignelles, and Fabrice Jégou
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-904, https://doi.org/10.5194/acp-2019-904, 2019
Revised manuscript not accepted (discussion: closed, 4 comments)
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Water and sulfuric acid droplets are the main component of stratospheric aerosols. Field measurements have shown that non-sulfate materials (NSPs) are also present. NSPs, released from Earth and from space, present a wide variety of sizes, compositions and shapes. New balloon counting measurements have shown the presence of enhanced-concentrations layers. We may conclude that the concentrations and the vertical distributions of NSPs are highly variable and mainly originate from Earth.
02 Dec 2019
Influence of Asian Summer Monsoon Anticyclone on the Trace gases and Aerosols over Indian region
Ghouse Basha, M. Venkat Ratnam, Pangaluru Kishore, S. Ravindrababu, and Isabella Velicogna
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-743, https://doi.org/10.5194/acp-2019-743, 2019
Preprint withdrawn (discussion: closed, 4 comments)
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The Asian Summer Monsoon Anticyclone (ASMA) plays an important role in confining the trace gases and aerosols for a longer period. This study explores the variability of tropopause parameters, trace gases and aerosols and its relation with ENSO and QBO in ASMA. Further, the influence of the Indian summer monsoon activity on the ASMA trace gases and aerosols is studied with respect to active and break spells of monsoon, strong and weak monsoon years and strong La Niña, El Niño years.
26 Nov 2019
Space-time variability of ambient PM2.5 diurnal pattern over India from 18-years (2000–2017) of MERRA-2 reanalysis data
Kunal Bali, Sagnik Dey, Dilip Ganguly, and Krik R. Smith
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-731, https://doi.org/10.5194/acp-2019-731, 2019
Revised manuscript not accepted (discussion: closed, 4 comments)
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The ambient PM2.5 concentration has been observed using various in-situ instruments and satellites over India. But none of these observations have been able to cover the complete spatiotemporal coverage. So, here we tried to cover these gaps by using the hourly MERRA-2 aerosol reanalysis data over the Indian region. We hope these results will help formulate better air pollution mitigation plans so that the national burden of disease attributed to ambient air pollution could be decreased.
21 Nov 2019
A Global Analysis of Dust Diurnal Variability Using CATS Observations
Yan Yu, Olga V. Kalashnikova, Michael J. Garay, Huikyo Lee, Myungje Choi, Gregory S. Okin, John E. Yorks, and James R. Campbell
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-975, https://doi.org/10.5194/acp-2019-975, 2019
Preprint withdrawn (discussion: closed, 3 comments)
Short summary
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Given the current uncertainties in the simulated diurnal variability of global dust mobilization and concentration, observational characterization of the variations in dust mobilization and concentration will provide a valuable benchmark for evaluating and constraining such model simulations. The current study investigates the diurnal cycle of dust loading across the global tropics, sub-tropics, and mid-latitudes by analyzing aerosol observations from the International Space Station.
08 Nov 2019
Contribution of horizontal and vertical advection to the formation of
small-scale vertical structures of ozone in the lower and middle
stratosphere at Fairbanks, Alaska
Miho Yamamori, Yasuhiro Murayama, Kazuo Shibasaki, Isao Murata, and Kaoru Sato
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-837, https://doi.org/10.5194/acp-2019-837, 2019
Preprint withdrawn (discussion: closed, 3 comments)
Short summary
Short summary
The contribution of vertical and horizontal advection to the production of small-scale vertical ozone structures in the stratosphere is investigated using data from an ozonesonde observation performed at intervals of 3 h in Fairbanks, Alaska. A case is reported in which horizontal advection due to an inertia gravity wave with near-inertial frequency mainly contributes to the formation of a small-scale vertical ozone structure in the middle stratosphere.
06 Nov 2019
Impact of atomic chlorine on the modelling of total methane and its 13C : 12C isotopic ratio at global scale
Joël Thanwerdas, Marielle Saunois, Antoine Berchet, Isabelle Pison, Didier Hauglustaine, Michel Ramonet, Cyril Crevoisier, Bianca Baier, Colm Sweeney, and Philippe Bousquet
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-925, https://doi.org/10.5194/acp-2019-925, 2019
Revised manuscript not accepted (discussion: closed, 3 comments)
Short summary
Short summary
Oxidation by the hydroxyl radical (OH) is the dominant atmospheric sink for methane, contributing to approximately 90 % of the total methane loss. Chemical losses by reaction with atomic oxygen (O1D) and chlorine radicals (Cl) in the stratosphere are other sinks, contributing about 3 % to the total methane destruction. We assess here the impact of atomic Cl on atmospheric methane mixing ratios, methane atmospheric loss and atmospheric isotopic δ13C-CH4 values.
06 Nov 2019
Signs of reduced biospheric activity with progressing global warming: evidence from long-term records of atmospheric CO2 mixing ratios in Central-Eastern Europe
Łukasz Chmura, Michał Gałkowski, Piotr Sekuła, Mirosław Zimnoch, Jarosław Nęcki, Jakub Bartyzel, Damian Zięba, Kazimierz Różański, Wojciech Wołkowicz, and Laszlo Haszpra
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-748, https://doi.org/10.5194/acp-2019-748, 2019
Revised manuscript not accepted (discussion: closed, 8 comments)
Short summary
Short summary
The rise of temperatures across the globe, mainly attributed to the anthropogenic emissions of greenhouse gases, is predicted to have an increased impact on ecosystems over the next century. One of the manifestations of this anthropogenic global warming will be the increased occurrence of prolonged droughts in the temperate climate zones. In the current study we present the evidence of an increased impact of droughts on the annual cycle of carbon dioxide over Central-Eastern Europe.
30 Sep 2019
Particulate organic nitrates in eastern China: variation characteristics and effects of anthropogenic activities
Jun Zhang, Xinfeng Wang, Rui Li, Shuwei Dong, Yingnan Zhang, Penggang Zheng, Min Li, Tianshu Chen, Yuhong Liu, Likun Xue, Wei Nie, Aijun Ding, Mingjin Tang, Xuehua Zhou, Lin Du, Qingzhu Zhang, and Wenxing Wang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-757, https://doi.org/10.5194/acp-2019-757, 2019
Preprint withdrawn (discussion: closed, 6 comments)
Short summary
Short summary
This study presents the concentrations, variation characteristics, and key influencing factors of particulate organic nitrates at four urban and rural sites in eastern China. The effects of anthropogenic activities (i.e. biomass burning and coal combustion) and meteorological conditions (in particular the humidity) on the secondary formation of organic nitrates have been investigated. The results highlight the greater role of SO2 in organic nitrate chemistry than previously assumed.
23 Aug 2019
A numerical modelling study of the physical mechanisms causing radiation to accelerate tropical cyclogenesisand cause diurnal cycles
Melville E. Nicholls, Warren P. Smith, Roger A. Pielke Sr., Stephen M. Saleeby, and Norman B. Wood
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-569, https://doi.org/10.5194/acp-2019-569, 2019
Preprint withdrawn (discussion: closed, 2 comments)
Short summary
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Numerical modeling simulations indicate that radiation significantly accelerates tropical cyclogenesis. This study provides evidence that the primary physical mechanism is nocturnal longwave cooling of the environment. This generates weak upward motion in the core of the system that over the course of a night promotes convective activity and is responsible for a diurnal cycle. Understanding the role of radiation is likely to lead to improved forecasting of these major weather events.
15 Aug 2019
Modeling of Gas-Wall Partitioning of Organic Compounds Using a Quantitative Structure–Activity Relationship
Sanghee Han, Myoseon Jang, and Huanhuan Jiang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-550, https://doi.org/10.5194/acp-2019-550, 2019
Revised manuscript not accepted (discussion: closed, 6 comments)
Short summary
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The gas-wall process (GWP) is the potential source of underestimation in the prediction of the formation of secondary organic aerosol (SOA). In this study, the GWP of semivolatile organic compounds varying in chemical functionalities and volatility was predicted by estimating their GW partitioning constant and accommodation coefficient using a quantitative structure–activity relationship method. The GWP model of this study will improve the model parameters used for SOA predictions.
06 Aug 2019
Geographical distributions of mesospheric gravity wave activity
before and after major sudden stratospheric warmings observed by
Aura/MLS
Klemens Hocke, Jonas Hagen, Franziska Schranz, and Leonie Bernet
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-630, https://doi.org/10.5194/acp-2019-630, 2019
Preprint withdrawn (discussion: closed, 3 comments)
Short summary
Short summary
The dense sampling of geopotential height (GPH) profiles of the microwave limb sounder (MLS) on NASA's satellite Aura is appropriate for detection of mesospheric gravity waves. Up to now, the global distribution of mesospheric gravity wave activity is relatively unknown. The study focuses on the relation of mesospheric gravity waves to major sudden stratospheric warmings.
17 Jul 2019
The Impact of CCN Concentrations on the Thermodynamic and Turbulent State of Arctic Mixed-Phase Clouds
Jan Chylik, Stephan Mertes, and Roel A. J. Neggers
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-637, https://doi.org/10.5194/acp-2019-637, 2019
Preprint withdrawn (discussion: closed, 4 comments)
Short summary
Short summary
Arctic low-levels clouds play an important role in the Arctic warming, however they are not properly represented in weather and climate models. Among other issues, there are difficulties with balance of ice and liquid in clouds, as well as interaction between clouds and aerosols. In this model study, we focus on the way that variation in the concentration of aerosols affect the evolution of clouds and the turbulence. Model scenarios are based on the observations during the ACLOUD campaign.
08 Jul 2019
The effect of low density over the “roof of the world” Tibetan Plateau on the triggering of convection
Yinjun Wang, Xiangde Xu, Mingyu Zhou, Donald H. Lenschow, Xueliang Guo, Yang Zhao, and Bin Chen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-273, https://doi.org/10.5194/acp-2019-273, 2019
Revised manuscript not accepted (discussion: closed, 8 comments)
Short summary
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We study the relationships between convective characteristics and air density over the Tibetan Plateau from the perspective of both climate statistics and large eddy simulation. We find that smaller air density lead to stronger thermal turbulence which favors the formation and development of convective cloud. The original fixed parameter values in subcloud convective velocity scaling scheme may not adequate in case of lower relative humidity and weaker thermal turbulence in the subcloud layer.
01 Jul 2019
Dynamic shape factor and mixing state of refractory
black carbon particles in winter in Beijing using an
AAC-DMA-SP2 tandem system
Xiaole Pan, Hang Liu, Yu Wu, Yu Tian, Yele Sun, Conghui Xie, Xiaoyong Liu, Tianhai Cheng, and Zifa Wang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-433, https://doi.org/10.5194/acp-2019-433, 2019
Revised manuscript not accepted (discussion: closed, 8 comments)
17 Jun 2019
Morphology, mixing state, and hygroscopicity of primary biological
aerosol particles from a Chinese boreal forest
Weijun Li, Lei Liu, Qi Yuan, Liang Xu, Yanhong Zhu, Bingbing Wang, Hua Yu, Xiaokun Ding, Jian Zhang, Dao Huang, Dantong Liu, Wei Hu, Daizhou Zhang, Pingqing Fu, Maosheng Yao, Min Hu, Xiaoye Zhang, and Zongbo Shi
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-539, https://doi.org/10.5194/acp-2019-539, 2019
Preprint withdrawn (discussion: closed, 6 comments)
Short summary
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The real state of individual primary biological aerosol particles (PBAPs) derived from natural sources is under mystery, although many studies well evaluate the morphology, mixing state, and elemental composition of anthropogenic particles. It induces that some studies mislead some anthropogenic particles into biological particles through electron microscopy. Here we firstly estimate the full database of individual PBAPs through two microscopic instruments. The database is good for research.
24 May 2019
Sensitivity of CHIMERE to changes in model resolution and chemistry over the northwestern Iberian Peninsula
Swen Brands, Guillermo Fernández-García, Marcos Tesouro Montecelo, Nuria Gallego Fernández, Anthony David Saunders Estévez, Pablo Enrique Carracedo García, Anabela Neto Venancio, Pedro Melo da Costa, Paula Costa Tomé, Christina Otero, María Luz Macho, and Juan Taboada
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-351, https://doi.org/10.5194/acp-2019-351, 2019
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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The capability of numerical models used to predict air quality depends on many factors. Here, the role of model resolution and model chemistry is assessed for the CHIMERE model and the northwestern Iberian Peninsula. Forecasts are improved particularly by increasing the vertical resolution in the lower and middle troposphere. This finding might help to achieve better forecasts in other regions as well.
20 May 2019
The roles of island size and orography on tropical convection and aerosol transport
Stacey Kawecki and Susan van den Heever
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-399, https://doi.org/10.5194/acp-2019-399, 2019
Preprint withdrawn (discussion: closed, 4 comments)
Short summary
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This work examines how the topographic height and diameter of an island influence where and when precipitation falls, and why these patterns change. Using a numerical weather model, we systematically increased island orographic heights and diameters. We find that increasing orography increases precipitation amounts, regardless of island diameter size. Precipitation increases because changing the topography alters where moisture and lift occur, which are the prime ingredients for precipitation.
17 May 2019
Segregation in the Atmospheric Boundary Layer: The Case of OH – Isoprene
Ralph Dlugi, Martina Berger, Chinmay Mallik, Anywhere Tsokankunku, Michael Zelger, Otávio C. Acevedo, Efstratios Bourtsoukidis, Andreas Hofzumahaus, Jürgen Kesselmeier, Gerhard Kramm, Daniel Marno, Monica Martinez, Anke C. Nölscher, Huug Ouwersloot, Eva Y. Pfannerstill, Franz Rohrer, Sebastian Tauer, Jonathan Williams, Ana-Maria Yáñez-Serrano, Meinrat O. Andreae, Hartwig Harder, and Matthias Sörgel
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-1325, https://doi.org/10.5194/acp-2018-1325, 2019
Publication in ACP not foreseen (discussion: closed, 4 comments)
Short summary
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Incomplete mixing (segregation) results in reduced chemical reaction rates compared to those expected from mean values and rate constants. Segregation has been suggested to cause discrepancies between modelled and measured OH radical concentrations. In this work, we summarize the intensities of segregation for the reaction of OH and isoprene for different field and modelling studies and compare those to our results from measurements in a pristine environment.
13 May 2019
Is the photochemistry activity weak during haze events? – A novel exploration on the photoinduced heterogeneous reaction of NO2 on mineral dust
Tao Wang, Yangyang Liu, Yue Deng, Hanyun Cheng, Yang Yang, Yiqing Feng, Muhammad Ali Tahir, Xiaozhong Fang, Xu Dong, Kejian Li, Saira Ajmal, Aziz-Ur-Rahim Bacha, Iqra Nabi, Hongbo Fu, Liwu Zhang, and Jianmin Chen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-315, https://doi.org/10.5194/acp-2019-315, 2019
Revised manuscript not accepted (discussion: closed, 9 comments)
Short summary
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We studied the heterogeneous formation of nitrate and nitrite aerosols by in-situ laboratory tests and field observations. Sunlight becomes the protagonist under weak illumination, while a costar under strong irradiation, attributing to the balance between NO2 adsorption and the formation of photoinduced active species. Meanwhile, sunlight determines the association between atmospheric nitrate and nitrite. We hope this work offer more suggestions for modelling studies.
10 May 2019
Enhancement of biogenic emissions of VOCs in the semi-arid region of India during
winter to summer transition period: Role of meteorological conditions
Nidhi Tripathi and Lokesh Kumar Sahu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-335, https://doi.org/10.5194/acp-2019-335, 2019
Preprint withdrawn (discussion: closed, 6 comments)
Short summary
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This is the first study presenting the dependence of monoterpene on meteorology during winter-to-summer transition period at urban region of western India. The estimated contribution from local biogenic sources to ambient monoterpene increased from 31 % in first half of February to 67 % in second half of March. This study is important to validate the model and also to identify the anthropogenic and biogenic precursors of ozone and secondary organic aerosols over tropical semi-arid urban region.
06 May 2019
Molecular Characterization of Organosulfates in Arctic Ocean and
Antarctic atmospheric aerosols
Yuqing Ye, Zhouqing Xie, Ming Zhu, and Xinming Wang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-410, https://doi.org/10.5194/acp-2019-410, 2019
Preprint withdrawn (discussion: closed, 4 comments)
Short summary
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Aerosol samples from the Arctic Ocean and Antarctic atmosphere were analysed by ultrahigh resolution mass spectrometry coupled with negative ion mode electrospray ionization. Hundreds of organic compounds, including organosulfates, nitrooxy-organosulfates, organonitrates and oxygenated hydrocarbons, were detected. Our study presents the first overview of OSs and ONs in the polar regions and promotes the understanding of their characteristics and sources.
17 Apr 2019
Global modeling of fungal spores with the EMAC chemistryclimate model: uncertainties in emission parametrizations and observations
Meryem Tanarhte, Sara Bacer, Susannah M. Burrows, J. Alex Huffman, Kyle M. Pierce, Andrea Pozzer, Roland Sarda-Estève, Nicole J. Savage, and Jos Lelieveld
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-251, https://doi.org/10.5194/acp-2019-251, 2019
Publication in ACP not foreseen (discussion: closed, 2 comments)
Short summary
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Bioaerosols have been an important topic in atmospheric science in the last two decades. This paper compares different emission parametrizations used in fungal spores modeling and compare their results to two sets of new observational datasets. It emphasises their uncertainties in order to improve their modeling in the future. This comparison is addressed primarily to the scientific community (publishing in ACP) interested in this type of modeling and the related experimental work in this field.
29 Mar 2019
Evaluation of Anthropogenic Emissions and Ozone Pollution in the North China Plain: Insights from the Air Chemistry Research in Asia (ARIAs) Campaign
Hao He, Xinrong Ren, Sarah E. Benish, Zhanqing Li, Fei Wang, Yuying Wang, Timothy P. Canty, Xiaobo Dong, Feng Lv, Yongtao Hu, Tong Zhu, and Russell R. Dickerson
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-248, https://doi.org/10.5194/acp-2019-248, 2019
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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We conducted aircraft measurements of air pollution in the North China Plain. Concentrations of air pollutants higher than the air quality standards were observed. Our modeling study indicates that the rate of ozone (one major air pollutant) production is determined by volatile organic compounds (VOCs), which is confirmed by satellite observations. Currently, VOCs are not well regulated in China, so this study suggests the future direction of control measures to improve air quality in China.
19 Mar 2019
Properties of biomass burning aerosol mixtures derived at fine temporal and spatial scales from Raman lidar measurements: Part I optical properties
Lucja Janicka and Iwona S. Stachlewska
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-207, https://doi.org/10.5194/acp-2019-207, 2019
Revised manuscript not accepted (discussion: closed, 6 comments)
Short summary
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The fine temporal and spatial scale analysis of the aerosol optical properties is presented based on the lidar measurements in Warsaw during the heat wave on August 9th–11th, 2015. The signals from quasi-continuous PollyXT-UW lidar measurements provided the high quality sets of profiles. In the study the statistical approach to aerosol layers characterization by the means of optical properties were adopted. Obtained data set have the potential to use in the fine scale microphysical retrieval.
19 Mar 2019
Decadal Trends and Variability in Intermountain West Surface Ozone near Oil and Gas Extraction Fields
Ying Zhou, Huiting Mao, and Barkley C. Sive
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-164, https://doi.org/10.5194/acp-2019-164, 2019
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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Ozone is a detrimental air pollutant affecting the public health. Elevated ozone episodes have been reported in oil and natural gas basins. However, there have not any studies investigating the long term impact of expanded oil and gas extraction activities on ozone. Our study suggests that emissions from oil and gas extraction have likely played a significant role in shaping decadal trends in ozone design values in the Intermountain West. The findings of this study are highly policy relevant.
18 Mar 2019
Soil emissions, soil air dynamics and model simulation of gaseous mercury in subtropical forest
Jun Zhou, Zhangwei Wang, Xiaoshan Zhang, Charles Driscoll, and Che-Jen Lin
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-161, https://doi.org/10.5194/acp-2019-161, 2019
Preprint withdrawn (discussion: closed, 4 comments)
Short summary
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Previous studies showed that Hg emissions from the natural resource exists large uncertainty, which was mainly derived from the forest with a large uncertainty range. Long-term and multi-plot (five) study of soil-air fluxes and the vertical distribution of Hg in a subtropical forest were conducted to reduce the uncertainty. Additionally, The Hg diffusion coefficients (Ds) between soil and atmosphere was investigated, which should provide a foundation for future model development.
22 Feb 2019
Atmospheric observations and emission estimates of ozone-depleting chlorocarbons from India
Daniel Say, Anita L. Ganesan, Mark F. Lunt, Matthew Rigby, Simon O'Doherty, Chris Harth, Alistair J. Manning, Paul B. Krummel, and Stephane Bauguitte
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-1287, https://doi.org/10.5194/acp-2018-1287, 2019
Publication in ACP not foreseen (discussion: closed, 3 comments)
Short summary
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India is a potentially significant source of chlorocarbons, gases typically used as solvents and feedstocks. Given the potential for these species to deplete stratospheric ozone, understanding their sources is important. We use flask measurements collected from an aircraft to infer India's chlorocarbon emissions. We link emissions of carbon tetrachloride to the industrial production of other chloromethanes, and provide evidence for rapid growth in India's emissions of dichloromethane.
23 Jan 2019
Characterizations and source analysis of atmospheric inorganic ions
at a national background site in the northeastern Qinghai-Tibet
Plateau: insights into the influence of anthropogenic emissions on a
high-altitude area of China
Bin Han, Jing Wang, Xueyan Zhao, Baohui Yin, Xinhua Wang, Xiaoyan Dou, Wen Yang, and Zhipeng Bai
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-1345, https://doi.org/10.5194/acp-2018-1345, 2019
Revised manuscript not accepted (discussion: closed, 7 comments)
Short summary
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The Qinghai-Tibet Plateau (QTP) is an ideal location for characterizing aerosol properties. This study investigated the characterizations, formation, and sources of inorganic water-soluble ions associated with autumn PM2.5 at a background site in the QTP. One of our results suggests that the conversion of NO2 to NO3− is only promoted by photochemical reactions in the QTP, while particulate SO42− forms via both photochemical and heterogeneous reactions.
15 Jan 2019
Freezing from the inside. Ice nucleation in Escherichia coli and
Escherichia coli ghosts by inner membrane bound ice
nucleation protein InaZ
Johannes Kassmannhuber, Sergio Mauri, Mascha Rauscher, Nadja Brait, Lea Schöner, Angela Witte, Tobias Weidner, and Werner Lubitz
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-23, https://doi.org/10.5194/acp-2019-23, 2019
Preprint withdrawn (discussion: closed, 2 comments)
Short summary
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Empty cell envelopes of E. coli, called Bacterial Ghosts (BGs), carrying the ice nucleation protein of P. syringae on their inner membrane were successfully tested for their ability to act as ice nuclei at low subzero temperature (−6 °C) using a freezing droplet assay. Influence of airborne ice-active bacteria on cloud condensation and rain promotion within troposphere is well known. Illustrated by our results, BGs prove themselves as promising and environmental-friendly tool for cloud seeding.
15 Jan 2019
Impact of Atmospheric and Aerosol Optical Depth Observations on Aerosol Initial Conditions in a strongly-coupled data assimilation
system
Milija Zupanski, Anton Kliewer, Ting-Chi Wu, Karina Apodaca, Qijing Bian, Sam Atwood, Yi Wang, Jun Wang, and Steven D. Miller
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-2, https://doi.org/10.5194/acp-2019-2, 2019
Revised manuscript not accepted (discussion: closed, 3 comments)
Short summary
Short summary
The problem of under-observed aerosol observations and in particular the vertical distribution of aerosols is addressed using a strongly coupled atmosphere-aerosol data assimilation system. In the strongly coupled system the atmospheric observations, which are more numerous in general, can impact the aerosol initial conditions. In an application over a coastal zone, results indicate that atmospheric observations have a positive impact on aerosols.
21 Dec 2018
Elevated atmospheric mercury concentrations at the Russian polar
station Amderma during Icelandic volcanoes' eruptions
Fidel Pankratov, Alexander Mahura, Tuukka Petäjä, Valentin Popov, and Vladimir Masloboev
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-1228, https://doi.org/10.5194/acp-2018-1228, 2018
Revised manuscript not accepted (discussion: closed, 6 comments)
Short summary
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Analysis of long-term observations for atmospheric mercury in the Russian Arctic, considering inter-annual, seasonal and monthly variabilities is in focus. Linkage of elevated concentrations with volcanic eruptions in Iceland is explored. Results showed that active volcanoes can play a role of sources for increased mercury levels in the Northern Hemisphere due to long-range atmospheric transport of volcanic clouds towards the Arctic.
18 Dec 2018
Estimates of sub-national methane emissions from inversion modelling
Sarah Connors, Alistair J. Manning, Andrew D. Robinson, Stuart N. Riddick, Grant L. Forster, Anita Ganesan, Aoife Grant, Stephen Humphrey, Simon O'Doherty, Dave E. Oram, Paul I. Palmer, Robert L. Skelton, Kieran Stanley, Ann Stavert, Dickon Young, and Neil R. P. Harris
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-1187, https://doi.org/10.5194/acp-2018-1187, 2018
Preprint withdrawn (discussion: closed, 4 comments)
Short summary
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Methane is an important greenhouse gas & reducing its emissions is a vital part of climate change mitigation to limit global temperature increase to 1.5 °C or 2.0 °C. This paper explains a way to estimate emitted methane over a sub-national area by combining measurements & computer dispersion modelling in a so-called
inversiontechnique. Compared with the current national inventory, our results show lower emissions for Cambridgeshire, possibly due to waste sector emission differences.
17 Dec 2018
RAMS-MLEF Atmosphere-Aerosol Coupled Data Assimilation: A Case Study of A
Dust Event over the Arabian Peninsula on 4 August 2016
Ting-Chi Wu, Milija Zupanski, Stephen Saleeby, Anton Kliewer, Lewis Grasso, Qijing Bian, Samuel A. Atwood, Yi Wang, and Jun Wang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-1249, https://doi.org/10.5194/acp-2018-1249, 2018
Revised manuscript not accepted (discussion: closed, 3 comments)
10 Dec 2018
Experimental and model assessment of PM2.5 and BC emissions and concentrations in a Brazilian city – the Curitiba case study
Lars Gidhagen, Patricia Krecl, Admir Créso Targino, Gabriela Polezer, Ricardo H. M. Godoi, Francisco Castelhano, Erika Felix, Yago Alonso Cipoli, Francisco Malucelli, Alyson Wolf, Marcelo Alonso, David Segersson, Jorge Humberto Amorim, and Francisco Mendonça
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-1094, https://doi.org/10.5194/acp-2018-1094, 2018
Preprint withdrawn (discussion: closed, 4 comments)
Short summary
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Exposure to atmospheric fine particles constitutes a threat to health for urban citizens. Data on airborne fine particle emissions and concentrations in cities are valuable to traffic and air quality managers, urban planners, health practitioners, as well as to legislators and decision makers, however this type of data are lacking in most Brazilian cities. The integrated and comparatively rapid methodology described can be applied to other cities requiring a diagnostic air pollution assessment.
06 Dec 2018
Nutrients Dissolution Kinetics of Aerosols at Qianliyan Island, the Yellow Sea by a High Time-resolution Nutrient Dissolution Experiment, Potential Linkages with Inorganic Compositions and P solubility controlled factors
Ke Zhang, Lijun Han, Sumei Liu, and Lingyan Wang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-985, https://doi.org/10.5194/acp-2018-985, 2018
Preprint withdrawn (discussion: closed, 14 comments)
Short summary
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We did high time-resolution nutrient dissolution experiments used aerosols collected on atmospheric mass transport path over the East Asian to West Pacific at Qianliyan island. We obtained the rapid dissolution of inorganic N species and slow dissolution of inorganic P and Si, depicted nutrient dissolution curves by math Equations and explained dissolution patterns by linkages with aerosol inorganic components and their dissolution properties.
03 Dec 2018
The intensification of metallic layered phenomena above
thunderstorms through the modulation of atmospheric tides
Bingkun Yu, Xianghui Xue, Chengling Kuo, Gaopeng Lu, Xiankang Dou, Qi Gao, Jianfei Wu, Mingjiao Jia, Chao Yu, and Xiushu Qie
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-1025, https://doi.org/10.5194/acp-2018-1025, 2018
Preprint withdrawn (discussion: closed, 3 comments)
Short summary
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This paper explores the relationship between the intensifications of atomic sodium layer and Es layer in the Mesosphere/Lower Thermosphere (MLT) region (the earth's upper atmosphere at altitudes between 90 and 130 km above ground). The multi-instrument experiment of sodium lidar observations, ionospheric observations and sodium chemical simulations advances our understanding of the dynamical and chemical coupling processes in the mesosphere and ionosphere above thunderstorms.
29 Nov 2018
Validating the water vapour content from a reanalysis product and a
regional climate model over Europe based on GNSS observations
Julie Berckmans, Roeland Van Malderen, Eric Pottiaux, Rosa Pacione, and Rafiq Hamdi
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-1097, https://doi.org/10.5194/acp-2018-1097, 2018
Preprint withdrawn (discussion: closed, 2 comments)
Short summary
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The use of ground-based observations is suitable for the assessment of atmospheric water vapour in climate models. We used water vapour observations from 100 European sites to evaluate two models: a reanalysis product and a regional climate model. The results reveal patterns in the water vapour distribution both in time and space that are relevant as water vapour plays a key role in the feedback process of a changing climate.
21 Nov 2018
Interpreting the time variability of world-wide GPS and GOME/SCIAMACHY integrated water vapour retrievals, using reanalyses as auxiliary tools
Roeland Van Malderen, Eric Pottiaux, Gintautas Stankunavicius, Steffen Beirle, Thomas Wagner, Hugues Brenot, and Carine Bruyninx
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-1170, https://doi.org/10.5194/acp-2018-1170, 2018
Revised manuscript not accepted (discussion: closed, 7 comments)
Short summary
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The study investigates the long-term time variability of the integrated water vapour retrieved by different techniques (GPS, UV/VIS satellites and numerical weather prediction reanalyses) for a global dataset of almost 120 sites and for the time period 1995–2010. A stepwise multiple linear regression technique is applied to ascribe the time variability of integrated water vapour to surface measurements at the sites, but also using teleconnection patterns or climate/oceanic indices.
13 Nov 2018
Bias correction in assimilation of AOD observations with WRF-Chem
Anton Kliewer, Milija Zupanski, Qijing Bian, Sam Atwood, Yi Wang, and Jun Wang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-1156, https://doi.org/10.5194/acp-2018-1156, 2018
Revised manuscript not accepted (discussion: closed, 3 comments)
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This research is focused on improving numerical weather prediction by including data regarding aerosols in the atmosphere. Using weather prediction models along with data assimilation (the process of marrying observations with a model prediction), a better representation of the atmosphere can be described. As no model or observational platform is ever perfect, the aerosol observations have to be de-biased (adjusting for systematic error). Here we look at two such methods.
12 Nov 2018
The impact of mineral dust on the day-to-day variability of stratiform cloud glaciation occurrence
Diego Villanueva, Bernd Heinold, Patric Seifert, Hartwig Deneke, Martin Radenz, and Ina Tegen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-1074, https://doi.org/10.5194/acp-2018-1074, 2018
Revised manuscript not accepted (discussion: closed, 8 comments)
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Two different satellite products were analysed together with an atmospheric composition model to assess the global frequency of ice and liquid stratiform clouds. This analysis showed that at equal temperature the average occurrence of fully glaciated stratiform clouds was found to increase for higher dust mixing-ratios on a day-to-day basis in the mid- and high latitudes. This indicates that mineral dust may have a strong impact in the occurrence of ice clouds even in remote areas.
24 Sep 2018
Carbon dioxide emissions in Northern China based on atmospheric
observations from 2005 to 2009
Archana Dayalu, J. William Munger, Yuxuan Wang, Steven C. Wofsy, Yu Zhao, Thomas Nehrkorn, Chris Nielsen, Michael B. McElroy, and Rachel Chang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-632, https://doi.org/10.5194/acp-2018-632, 2018
Revised manuscript not accepted (discussion: closed, 6 comments)
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China has pledged reduction of carbon dioxide emissions per unit GDP by 60–65 % relative to 2005 levels, and to peak carbon emissions overall by 2030. Disagreement among available inventories of Chinese emissions makes it difficult for China to track progress toward its goals and evaluate the efficacy of regional control measures. This study uses a unique set of historical atmospheric observations for the key period from 2005–2009 to independently evaluate three different CO2 emissions estimates.
10 Sep 2018
Tracer study to estimate the transport of cruise altitude aviation
emissions in Northern Hemisphere
Lakshmi Pradeepa Vennam, William Vizuete, and Saravanan Arunachalam
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-601, https://doi.org/10.5194/acp-2018-601, 2018
Revised manuscript not accepted (discussion: closed, 7 comments)
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This study uses tagged tracer simulations to quantify the magnitudes of upper altitude aviation emissions that get transported to the surface. We show that only 0.6 % of these are found at surface after 90 days, and 30–40 % remain in mid-troposphere. Our findings will challenge prior studies that showed high aviation-attributable health risk, elucidate the role of aviation emissions in atmospheric composition and surface air quality, and help put these in context with other anthropogenic sources.
04 Sep 2018
Diagnosis of dust- and haze pollution-impacted PM10, PM2.5, and PM1 aerosols observed at Gosan Climate Observatory
Xiaona Shang, Meehye Lee, Saehee Lim, Örjan Gustafsson, Gangwoong Lee, and Limseok Chang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-721, https://doi.org/10.5194/acp-2018-721, 2018
Preprint withdrawn (discussion: closed, 5 comments)
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At Gosan Climate Observatory, the three main sources including anthropogenic pollution, soil dust, and agricultural fertilizer were distinguished for PM10, PM2.5, and PM1, which accounted for 71 % of the total variances for their mass and composition. The mass of mean + σ were comparable to the 90th percentile and the top 10 % implies the substantial impact of soil dust and haze pollution. In PM2.5, the contribution from non-combustion source such as soil dust should not be ignored.
28 Aug 2018
Evolutionary Characteristics of Lightning and Radar Echo Structure in Thunderstorms Based on the TRMM satellite
Xueke Wu, Tie Yuan, Rubin Jiang, and Jinliang Li
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-778, https://doi.org/10.5194/acp-2018-778, 2018
Preprint withdrawn (discussion: closed, 4 comments)
27 Aug 2018
Formation mechanism and source apportionment of water-soluble organic carbon in PM1, PM2.5 and PM10 in Beijing during haze episodes
Qing Yu, Jing Chen, Weihua Qin, Yuepeng Zhang, Siming Cheng, Mushtaq Ahmad, Xingang Liu, and Hezhong Tian
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-675, https://doi.org/10.5194/acp-2018-675, 2018
Preprint withdrawn (discussion: closed, 3 comments)
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Large-scale regional haze characterized by high concentrations of PM2.5 has frequently occurred in North China in recent years. Water soluble organic carbon (WSOC) in atmospheric aerosols may pose significant impacts on haze formation, climate change, and human health. This study investigated the distribution characteristics and sources of WSOC in Beijing during haze episodes in an effort to reveal the sources and formation mechanism of WSOC in a typical polluted megacity.
20 Aug 2018
Hygroscopic growth effect on aerosol light scattering in the urban area of Beijing: a long-term measurement by a wide-range and high-resolution humidified nephelometer system
Pusheng Zhao, Jing Ding, Xiang Du, and Jie Su
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-794, https://doi.org/10.5194/acp-2018-794, 2018
Preprint withdrawn (discussion: closed, 4 comments)
20 Aug 2018
Morphology, Chemical Composition and Mixing State of
Atmospheric Aerosols from Two Contrasting Environments in
Southern India
Chandrika Rajendran Hariram, Gaurav Govardhan, Mohanan Remani Manoj, Narayana Sarma Anand, Karuppiah Kannan, Sreedharan Krishnakumari Satheesh, and Krishnaswamy Krishna Moorthy
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-745, https://doi.org/10.5194/acp-2018-745, 2018
Revised manuscript not accepted (discussion: closed, 6 comments)
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The knowledge on the realistic state of mixing of aerosols is inevitable for climate studies. Our paper unravels the existing uncertainties regarding the morphology and mixing state of aerosols, hitherto unexplained. To the best of our knowledge, this is a first-of-its kind study over the Indian region, coupling realistic aerosol observations, advanced spectroscopic, microscopic and image processing techniques on atmospheric aerosols at single particle resolution.
17 Aug 2018
Annual cycle of water vapour in the lower stratosphere over the Indian Peninsula derived from Cryogenic Frost-point Hygrometer observations
Maria Emmanuel, Sukumarapillai V. Sunilkumar, Muhsin Muhammed, Buduru Suneel Kumar, Nagendra Neerudu, Geetha Ramkumar, Kunjukrishnapillai Rajeev, and Krishnasamyiyer Parameswaran
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-630, https://doi.org/10.5194/acp-2018-630, 2018
Revised manuscript not accepted (discussion: closed, 4 comments)
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Annual variation of lower stratospheric water vapour over two tropical stations Trivandrum (South west Peninsular India) and Hyderabad (South central India) in Indian Peninsula is studied using Cryogenic Frost point Hygrometer observations during the period 2015–2016. Though the mean annual cycle in lower stratospheric water vapour is determined by the annual cycle in the CPT temperature and large scale dynamics, local processes also modulates it in the altitude region just above the tropopause.
07 Aug 2018
Variations in the physicochemical and optical properties of
natural aerosols in Puerto Rico – Implications for climate
Héctor Rivera, John A. Ogren, Elisabeth Andrews, and Olga L. Mayol-Bracero
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-791, https://doi.org/10.5194/acp-2018-791, 2018
Preprint withdrawn (discussion: closed, 2 comments)
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This paper is about the variations of the physicochemical and optical properties of natural aerosols in Puerto Rico. We compare/contrast the implications of the loads, sizes, scattering, and absorbing properties of marine, African dust, and volcanic aerosols in the radiative forcing efficiency. We discuss how we classified these aerosols by source and their relative contribution to the radiative forcing efficiency. We contrast the change in temperature due to African dust and volcanic aerosols.
30 Jul 2018
Global XCO2 anomalies as seen by Orbiting Carbon Observatory-2
Janne Hakkarainen, Iolanda Ialongo, Shamil Maksyutov, and David Crisp
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-649, https://doi.org/10.5194/acp-2018-649, 2018
Revised manuscript not accepted (discussion: closed, 3 comments)
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We provide a global (60° S–60° N) view of the XCO2 anomalies, indicators of CO2 emissions to and removal from the atmosphere, and study their annual variations and seasonal patterns. We see that positive anomalies correspond to the emissions from fossil fuel combustion over the major industrial areas as well as biomass burning during different fire seasons. The largest negative anomalies correspond to the growing seasons in the middle latitudes. The results are achieved using NASA's OCO-2 data.
02 Jul 2018
New Particle Formation at a High Altitude Site in India:
Impact of Fresh Emissions and Long Range Transport
Vyoma Singla, Subrata Mukherjee, Adam Kristensson, Govindan Pandithurai, Kundan K. Dani, and Vasudevan Anil Kumar
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-637, https://doi.org/10.5194/acp-2018-637, 2018
Preprint withdrawn (discussion: closed, 4 comments)
25 Jun 2018
Satellite observations of aerosols and clouds over South China from
2006 to 2015: analysis of changes and possible interactions
Nikos Benas, Jan Fokke Meirink, Karl-Göran Karlsson, Martin Stengel, and Piet Stammes
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-554, https://doi.org/10.5194/acp-2018-554, 2018
Preprint withdrawn (discussion: closed, 4 comments)
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In this study we analyse aerosol and cloud changes over South China and investigate their possible interactions. The results show decreasing aerosol loads and increasing liquid clouds. Further analysis of these changes based on various satellite data sets show consistency with the aerosol semi-direct effect, whereby less absorbing aerosols in the cloud layer would lead to an overall decrease in evaporation of cloud droplets, thus increasing cloud amount and cover.
25 Jun 2018
Secondary organic aerosol formation from photooxidation of furan:
effects of NOx level and humidity
Xiaotong Jiang, Narcisse T. Tsona, Long Jia, Shijie Liu, Yongfu Xu, and Lin Du
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-477, https://doi.org/10.5194/acp-2018-477, 2018
Revised manuscript not accepted (discussion: closed, 4 comments)
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The roles of NOx level and RH on the formation of SOA from the photooxidation of furan in the presence of NaCl seed particles were elucidated. The aerosol liquid water (ALW) effects on SOA mass concentration and yield were also evaluated. The chemical composition of furan SOA was investigated by ESI-Exactive-Orbitrap MS, with focus on the formation of organic nitrates. Strong evidences indicate that both the RH and different NOx levels have a significant effect on SOA formation.
21 Jun 2018
Summer ozone variation in North China based on satellite and site observations
Lihua Zhou, Jing Zhang, Hui Wang, Wenhao Xue, Xiaohui Zheng, and Siguang Zhu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-537, https://doi.org/10.5194/acp-2018-537, 2018
Preprint retracted (discussion: closed, 4 comments)
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In this study, tropospheric ozone pollution in North China in the past 12 years has been evaluated with satellite observations to find out the cause of long-term pollution changes. And the factors influencing ozone pollution were analyzed with the ground observations in the past 3 years. In this paper, meteorological conditions and trace gases (nitrogen dioxide, sulfur dioxide, carbon monoxide, formaldehyde, PM2.5, temperature, solar radiation and relative humidity) were taken into account.
20 Jun 2018
Temporal evolution of chlorine and minor species related to ozone
depletion observed with ground-based FTIR at Syowa Station, Antarctica and satellites during austral fall to spring in 2007 and 2011
Hideaki Nakajima, Isao Murata, Yoshihiro Nagahama, Hideharu Akiyoshi, Kosuke Saeki, Masanori Takeda, Yoshihiro Tomikawa, and Nicholas B. Jones
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-505, https://doi.org/10.5194/acp-2018-505, 2018
Revised manuscript not accepted (discussion: closed, 9 comments)
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This paper presents characteristics of temporal evolution of stratospheric chlorine and minor species related to Antarctic ozone depletion, based on both ground-based FTIR and satellite measurements by MLS and MIPAS in 2007 and 2011. After chlorine reservoir species (HCl or ClONO2) were processed on PSCs and active ClO was formed, different chlorine deactivation pathways into reservoir species were identified, depending on availability of ambient available O3 and NOx amounts.
11 Jun 2018
Vehicular volatile organic compounds (VOCs)-NOx-CO emissions in a tunnel study in northern China: emission factors, profiles, and source apportionment
Congbo Song, Yan Liu, Shida Sun, Luna Sun, Yanjie Zhang, Chao Ma, Jianfei Peng, Qian Li, Jinsheng Zhang, Qili Dai, Baoshuang Liu, Peng Wang, Yi Zhang, Ting Wang, Lin Wu, Min Hu, and Hongjun Mao
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-387, https://doi.org/10.5194/acp-2018-387, 2018
Revised manuscript not accepted (discussion: closed, 4 comments)
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Vehicular emission is a key contributor to ambient volatile organic compounds (VOCs) and NOx in Chinese megacities. Information on real-world emission factors (EFs) for a typical urban fleet is still limited. We found that improvement of fuel quality can significantly reduce feet-average EFs of VOCs (especially for BTEX). Our study provided implications for O3 control in China from the view of primary emission, and highlighted the importance of further control of evaporative emissions.
06 Jun 2018
Fine particles from Independence Day fireworks events: chemical characterization and source apportionment
Jie Zhang, Sara Lance, Jeffrey M. Freedman, Yele Sun, Brian A. Crandall, Xiuli Wei, and James J. Schwab
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-529, https://doi.org/10.5194/acp-2018-529, 2018
Preprint retracted (discussion: closed, 4 comments)
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The impact of fireworks (FW) events on air quality was studied using a High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS) and collocated instruments during the Independence Day (July 4) holiday. The Independence Day FW events resulted in significant increases in both organic and inorganic (potassium, sulfate, chloride) chemical components, and the contribution from different aerosol sources was discussed.
25 May 2018
Aerosol acidity in a megacity with high ambient temperature and relative humidity of Central China: temporal variation, determining factors and pollution transition effect
Mingming Zheng, Shaofei Kong, Jianguo Bao, Ke Xu, Shurui Zheng, Guowei Yang, Jihong Quan, Lianxin Yuan, Nan Chen, Yiping Tian, Huang Zheng, Jian Wu, Dantong Liu, Delong Zhao, Qin Yan, Tianliang Zhao, and Shihua Qi
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-367, https://doi.org/10.5194/acp-2018-367, 2018
Preprint retracted (discussion: closed, 6 comments)
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In this paper, we study the aerosol acidity for different time scales, pollution episodes and air mass directions in a megacity of central China with high ambient temperature and relative humidity, and the impacting factors of pH were identified. This research is the first study concerning the aerosol acidity based on one-year online monitoring dataset with high resolution in central China, which is an important supplementary for the current aerosol acidity study around the world.
25 May 2018
Estimates of direct radiative forcing due to aerosols from the
MERRA-2 reanalysis over the Amazon region
Brunna Penna, Dirceu Herdies, and Simone Costa
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-355, https://doi.org/10.5194/acp-2018-355, 2018
Revised manuscript has not been submitted (discussion: closed, 3 comments)
08 May 2018
Global modeling of primary biological particle concentrations with the
EMAC chemistry-climate model
Meryem Tanarhte, Sara Bacer, Susannah M. Burrows, J. Alex Huffman, Kyle M. Pierce, Andrea Pozzer, Roland Sarda-Estève, Nicole J. Savage, and Jos Lelieveld
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-361, https://doi.org/10.5194/acp-2018-361, 2018
Revised manuscript not accepted (discussion: closed, 7 comments)
02 May 2018
February 2017 extreme Saharan dust outbreak in the Iberian
Peninsula: from lidar-derived optical properties to evaluation
of forecast models
Alfonso J. Fernández, Michaël Sicard, Maria J. Costa, Juan L. Guerrero-Rascado, José L. Gómez-Amo, Francisco Molero, Rubén Barragán, Daniele Bortoli, Andrés E. Bedoya-Velásquez, María P. Utrillas, Pedro Salvador, María J. Granados-Muñoz, Miguel Potes, Pablo Ortiz-Amezcua, José A. Martínez-Lozano, Begoña Artíñano, Constantino Muñoz-Porcar, Rui Salgado, Roberto Román, Francesc Rocadenbosch, Vanda Salgueiro, José A. Benavent-Oltra, Alejandro Rodríguez-Gómez, Lucas Alados-Arboledas, Adolfo Comerón, and Manuel Pujadas
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-370, https://doi.org/10.5194/acp-2018-370, 2018
Revised manuscript not accepted (discussion: closed, 8 comments)
02 May 2018
On the role of the south Pacific subtropical high at the onset of El Niño events
Youjia Zou and Xiangying Xi
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-82, https://doi.org/10.5194/acp-2018-82, 2018
Revised manuscript not accepted (discussion: closed, 7 comments)
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The cause of El Niño is under debate with no scientific consensus. By providing observational data and modelling experiments, we reveal that the southward shift of the south Pacific subtropical high is not a passive result of El Niño, but is driving El Niño. The "westerly wind burst" is actually a result of the weakening of the easterly winds. However, it is found by other authors that the southward movements of the south Pacific subtropical high are closely associated with the solar activities.
02 May 2018
Long-term trends of global marine primary and secondary aerosol production during the recent global warming hiatus (2000–2015)
Sang-Keun Song, Zang-Ho Shon, Yu-Na Choi, Young-Baek Son, Minsung Kang, Seung-Beom Han, and Min-Suk Bae
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-322, https://doi.org/10.5194/acp-2018-322, 2018
Revised manuscript not accepted (discussion: closed, 3 comments)
Short summary
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Over the past few decades, the Earth’s climate system has undergone substantial changes due to increases in atmospheric concentrations of greenhouse gases and aerosols. However, according to a recent study, the global mean surface air temperature has remained flat since around 2001, reflecting a hiatus in global warming. Thus, the long-term trends and impacts of global marine aerosol emissions and DMS fluxes on aerosol were evaluated loading during the recent warming hiatus period (2000-2015).
02 May 2018
Air Quality Predictions with an Analog Ensemble
Luca Delle Monache, Stefano Alessandrini, Irina Djalalova, James Wilczak, and Jason C. Knievel
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-1214, https://doi.org/10.5194/acp-2017-1214, 2018
Preprint withdrawn (discussion: closed, 4 comments)
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The authors demonstrate how the analog ensemble (AnEn) can efficiently generate deterministic and probabilistic forecasts of air quality. The method avoids the complexity and real-time computational expense of dynamical (i.e., model-based) ensembles. AnEn deterministic predictions have lower errors and are better correlated with observations. Probabilistic forecasts from AnEn are statistically consistent, reliable, and sharp, and they quantify the uncertainty of the underlying prediction.
24 Apr 2018
Fossil and Non-fossil Sources of Organic and Elemental Carbon Aerosols in Beijing, Shanghai and Guangzhou: Seasonal Variation of Carbon Source
Di Liu, Matthias Vonwiller, Jun Li, Junwen Liu, Sönke Szidat, Yanlin Zhang, Chongguo Tian, Yinjun Chen, Zhineng Cheng, Guangcai Zhong, Pingqing Fu, and Gan Zhang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-295, https://doi.org/10.5194/acp-2018-295, 2018
Revised manuscript not accepted (discussion: closed, 3 comments)
23 Apr 2018
River Breezes for Pollutant Dispersion in GoAmazon2014/5
Adan S. S. Medeiros, Igor O. Ribeiro, Marcos V. B. Morais, Rita V. Andreoli, Jorge A. Martins, Leila D. Martins, Carla E. Batista, Patrícia C. Guimarães, Scot T. Martin, and Rodrigo A. F. Souza
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-347, https://doi.org/10.5194/acp-2018-347, 2018
Revised manuscript not accepted (discussion: closed, 6 comments)
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The study evaluates the river breezes influence on pollutant plume dispersion or canalization in central amazon, using atmospheric chemistry modelling. Manaus, a 2 million people city, is considered herein for be a major city surrounded by pristine forest and large rivers. The main conclusion is that Manaus pollution plume dispersion could at times be partially canalized leading to significant changes of surface river concentration, even most of Manaus plume following prevailing trade winds.
23 Apr 2018
Mercury fluxes, budgets and pools in forest ecosystems of China: A critical review
Jun Zhou, Buyun Du, Zhangwei Wang, Lihai Shang, and Jing Zhou
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-794, https://doi.org/10.5194/acp-2017-794, 2018
Preprint withdrawn (discussion: closed, 4 comments)
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The current knowledge concerning mercury budgets and pools of forest in China is reviewed, including THg and MeHg input fluxes by precipitation, throughfall and litterfall, output by runoffs and soil-atmosphere exchange fluxes, Hg storage in soils and biomass, and their risk assessment. The annual THg retentions at forests of China are about 1.2 to 7.9-fold higher compared to those in North America, and THg retention in forest is much high than that in global scale estimated by models.
16 Apr 2018
Multiday haze in the East Asia:
Transport and chemical aging of hygroscopic particles
Yong Bin Lim, Jihoon Seo, Jin Young Kim, and Barbara J. Turpin
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-364, https://doi.org/10.5194/acp-2018-364, 2018
Revised manuscript not accepted (discussion: closed, 4 comments)
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Currently high concentration PM formation in East Asia (China and Korea) is poorly understood. Furthermore, the combination of the transport from China and the local formation complicates PM formation in Korea. Based on our field and smog chamber studies, water in particles plays an important role. Transported wet particles take up HNO3 at Seoul characterized by high NOx/RH and photochemistry. Accumulated nitrates take up water and facilitate aqueous chemistry leading to secondary formation.
16 Apr 2018
Modeling tropospheric O3 evolution during the 2016 Group of Twenty summit in Hangzhou, China
Zhi-zhen Ni, Kun Luo, Yang Gao, Fei Jiang, Xiang Gao, Jian-ren Fan, and Chang-hong Chen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-76, https://doi.org/10.5194/acp-2018-76, 2018
Revised manuscript not accepted (discussion: closed, 4 comments)
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A unique mechanism was found to modulate the high ozone episodes in Hangzhou during G20 summit: Driven by tropical cyclone convergence, prevailing north winds brought in emission sources; with invasion of tropical cycle, subsidence air and stagnant weather was induced, as well as the urban heat island effect, intensifying the ozone enhancement. Different atmospheric processes were further analyzed to elucidate the control factors of ozone formation through integrated process rate method.
20 Mar 2018
Summertime Arctic Aircraft Measurements during ACCACIA
Hazel M. Jones, Gillian Young, Thomas W. Choularton, Keith N. Bower, Thomas Lachlan-Cope, Sebastian O'Shea, James Dorsey, Russell Ladkin, Amelié Kirchgaessner, and Alexandra Weiss
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-283, https://doi.org/10.5194/acp-2018-283, 2018
Revised manuscript not accepted (discussion: closed, 3 comments)
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This paper presents new in-situ aerosol and cloud physics measurements from the Arctic during the summertime ACCACIA campaign. Data from eight flights in the vicinity of Svalbard are presented and compared to data from previous Arctic projects. It is hoped this dataset will be of use to modellers who wish to develop polar cloud parameterisations.
13 Mar 2018
Is Mass Transfer in Secondary Organic Aerosol Particles Intrinsically Slow? Equilibration Timescales of Engine Exhaust and α-Pinene SOA Under Dry and Humid Conditions
Khairallah Atwi, Mohamad Baassiri, Mariam Fawaz, and Alan Shihadeh
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-215, https://doi.org/10.5194/acp-2018-215, 2018
Revised manuscript has not been submitted (discussion: closed, 2 comments)
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Secondary organic aerosols (SOA) influence health and climate. A major simplifying assumption usually made in airshed models is that SOA particles attain instantaneous phase equilibrium with their surroundings. This assumption has been questioned by several recent studies. We generated engine exhaust and biogenic SOA and investigated their evaporation behavior upon dilution. Consistent with current practice, we found that SOA reestablish equilibrium on timescales small enough to be neglected.
07 Mar 2018
A Preliminary Assessment of the Impacts of Multiple Temporal-scale Variations in Particulate Matter on its Source Apportionment
Xing Peng, Jian Gao, Guoliang Shi, Xurong Shi, Yanqi Huangfu, Jiayuan Liu, Yuechong Zhang, Yinchang Feng, Wei Wang, Ruoyu Ma, Cesunica E. Ivey, and Yi Deng
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-997, https://doi.org/10.5194/acp-2017-997, 2018
Preprint withdrawn (discussion: closed, 7 comments)
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A finding here is that source emission dominates the level of pollutants and short-term meteorological condition determines the variation of pollutants. Primary source impact levels are mainly influenced by source emissions, and secondary source impact levels are mainly influenced by synoptic scale fluctuations and source emissions. The implications of results are for source apportionment analyses conducted with data from different geographical locations and under various weather conditions.
07 Mar 2018
VOCs emission profiles from rural cooking and heating
in Guanzhong Plain, China and its potential effect on
regional O3 and SOA formation
Jian Sun, Zhenxing Shen, Yu Huang, Junji Cao, Steven Sai Hang Ho, Xinyi Niu, Taobo Wang, Qian Zhang, Yali Lei, Hongmei Xu, and Hongxia Liu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-36, https://doi.org/10.5194/acp-2018-36, 2018
Revised manuscript not accepted (discussion: closed, 4 comments)
02 Mar 2018
A high-resolution inventory of air pollutant emissions from crop residue burning in China
Xiaohui Zhang, Yan Lu, Qin'geng Wang, and Xin Qian
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-1113, https://doi.org/10.5194/acp-2017-1113, 2018
Preprint withdrawn (discussion: closed, 4 comments)
Short summary
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Activity data at prefectural-city level combined with high-resolution land use data were adopted to improve spatial resolution and detailed crop rotations and harvest times in different regions were considered in determining temporal distribution. Also, MODIS fire products were applied to verify the spatial and temporal variations of the emissions. Results showed that high emissions were generally located in Eastern, Central and Northeastern China, and temporally peaking in June and October.
01 Mar 2018
Cloud-top microphysics evolution in the Gamma phase space from a
modeling perspective
Lianet Hernández Pardo, Luiz Augusto Toledo Machado, and Micael Amore Cecchini
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-190, https://doi.org/10.5194/acp-2018-190, 2018
Revised manuscript not accepted (discussion: closed, 5 comments)
06 Feb 2018
Haze pollution in winter and summer in Zibo, a heavily industrialized city
neighboring the Jin-Jin-Ji area of China: source, formation, and implications
Hui Li, Fengkui Duan, Yongliang Ma, Kebin He, Lidan Zhu, Tao Ma, Siqi Ye, Shuo Yang, Tao Huang, and Takashi Kimoto
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-83, https://doi.org/10.5194/acp-2018-83, 2018
Preprint withdrawn (discussion: closed, 3 comments)
Short summary
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This study compares the characteristics of haze between winter and summer in Zibo, a highly industrialized city in the North China Plain. Sulfate is influenced by relative humidity in winter but photochemistry and SO2 in summer; nitrate is vulnerable to NO2 in winter while to temperature in summer; mixed layer height is more decisive on secondary organic carbon than photochemistry in winter, but a reversed situation occurred in summer. Obivious regional transport is also a cause to haze here.
05 Feb 2018
Formation and characteristics of secondary aerosols in an
industrialized environment during cold seasons
Yangzhou Wu, Xinlei Ge, Junfeng Wang, Yafei Shen, Zhaolian Ye, Shun Ge, Yun Wu, Huan Yu, and Mindong Chen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-75, https://doi.org/10.5194/acp-2018-75, 2018
Preprint withdrawn (discussion: closed, 2 comments)
Short summary
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This work presents results regarding the secondary aerosol formations in suburan Nanjing, a site downwind of an industrial zone. We show that under such an industrialized environment, secondary species overwhelmingly dominate the fine particle mass, and moisture (relative humidity) is critical in enhancing formations of sulfate, nitrate and the most oxygenated portion of OA, while less oxygenated secondary OA was mainly driven by photochemical processing.
29 Jan 2018
The underestimated role of stratosphere-to-troposphere transport on tropospheric ozone
Thomas Trickl, Hannes Vogelmann, Ludwig Ries, Hans-Eckhart Scheel, and Michael Sprenger
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-1192, https://doi.org/10.5194/acp-2017-1192, 2018
Revised manuscript not accepted (discussion: closed, 4 comments)
15 Jan 2018
Identifying biomass burning impacts on air quality in Southeast Texas 26–29 August 2011 using satellites, models and surface data
David A. Westenbarger and Gary A. Morris
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-1234, https://doi.org/10.5194/acp-2017-1234, 2018
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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As ambient air quality standards are strengthened, understanding transported pollution becomes more important. We identify transported biomass burning plumes using an ensemble of in situ ambient monitors, remote sensing instruments, and chemical transport models. An example for Houston TX USA over a multi-day period in 2011 is examined. Enhancements in O3, aerosols, and CO confirm presence of transported parcels likely originating from upwind regions with pervasive biomass burning.
05 Jan 2018
Aircraft measurements of black carbon in the boundary layer over the North China Plain
Delong Zhao, Mengyu Huang, Dantong Liu, Deping Ding, Ping Tian, Quan Liu, Wei Zhou, Jiujiang Sheng, Fei Wang, Kai Bi, Yan Yang, Xia Li, Yaqiong Hu, Xin Guo, Yang Gao, Hui He, Yunbo Chen, Shaofei Kong, and Jiayi Huang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-1118, https://doi.org/10.5194/acp-2017-1118, 2018
Preprint withdrawn (discussion: closed, 3 comments)
Short summary
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This study for the first time reports the 3D distributions of black carbon and detailed physical properties in the boundary layer over the North China Plain, using intensive aircraft measurements in both hot and cold seasons. The BC mass in the planetary boundary layer (PBL) was found to be largely influenced by meteorology which modulated the local emission and regional transport.
20 Dec 2017
Constraining fossil fuel CO2 emissions from urban area using OCO-2 observations of total column CO2
Xinxin Ye, Thomas Lauvaux, Eric A. Kort, Tomohiro Oda, Sha Feng, John C. Lin, Emily Yang, and Dien Wu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-1022, https://doi.org/10.5194/acp-2017-1022, 2017
Revised manuscript not accepted (discussion: closed, 3 comments)
Short summary
Short summary
Rapid global urbanization and significant fossil fuel consumption by cities emphasize the necessity of achieving independent and accurate quantification of the carbon emissions from urban areas. In this paper, we assess the potential of using total column CO2 concentration observed from satellite to quantify fossil-fuel carbon emissions from cities. This study could give insights into the capability of satellite observations on monitoring of the emissions on local scale.
14 Dec 2017
Comparison of the optical properties of pure and transported anthropogenic dusts measured by ground-based Lidar
Zhijuan Zhang, Bin Chen, Jianping Huang, Jingjing Liu, Jianrong Bi, Tian Zhou, and Zhongwei Huang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-1000, https://doi.org/10.5194/acp-2017-1000, 2017
Revised manuscript not accepted (discussion: closed, 9 comments)
Short summary
Short summary
Environmental problems caused by aerosols such as dust aerosols are influencing people's lives and work. Due to different radiative effects of different types of aerosols, detection of the aerosol type is vital for improving our air quality. In this study, the optical properties of pure dust and transported anthropogenic dust are compared by using ground-based Lidar data. Based on our conclusion, detection of different dust aerosols will be more accurate using satellite-based Lidar.
06 Dec 2017
On the Use of Measurements from a Commercial Microwave Link for Evaluation of Flash Floods in Arid Regions
Adam Eshel, Hagit Messer, Jonatan Ostrometzky, Roi Raich, Pinhas Alpert, and Jonathan B. Laronne
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-963, https://doi.org/10.5194/acp-2017-963, 2017
Revised manuscript not accepted (discussion: closed, 7 comments)
Short summary
Short summary
The power of a signal between two telecommunication (cellular) towers weakens when rain falls in the medium. Through which, accurate rain intensity at ground level in remote areas can be derived. This unique database, together with weather radar data was used to show the feasibility of its integration into short-term flash flood warning in arid areas, a challenging task using traditional means. Commercial towers are widely spread sensors and were therefore used opportunistically.
04 Dec 2017
Key factors affecting single scattering albedo calculation: Implications for aerosol climate forcing
Duseong S. Jo, Rokjin J. Park, Jaein I. Jeong, Gabriele Curci, Hyung-Min Lee, and Sang-Woo Kim
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-1104, https://doi.org/10.5194/acp-2017-1104, 2017
Preprint retracted (discussion: closed, 6 comments)
01 Dec 2017
Estimations of anthropogenic dust emissions at global scale from 2007 to 2010
Siyu Chen, Jianping Huang, Nanxuan Jiang, Zhou Zang, Xiaodan Guan, Xiaojun Ma, Zhuo Jia, Xiaorui Zhang, Yanting Zhang, Kangning Huang, Xiaocong Xu, Guolong Zhang, Jiming Li, Ran Yang, and Shujie Liao
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-890, https://doi.org/10.5194/acp-2017-890, 2017
Revised manuscript not accepted (discussion: closed, 4 comments)
13 Nov 2017
How does soil water availability control phytotoxic O3 dose to
montane pines? Modelling and experimental study from two
contrasting climatic regions in Europe
Svetlana Bičárová, Zuzana Sitková, Hana Pavlendová, Peter Fleischer Jr., Peter Fleischer Sr., Laurence Dalstein-Richier, Marie-Lyne Ciriani, and Andrzej Bytnerowicz
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-1005, https://doi.org/10.5194/acp-2017-1005, 2017
Revised manuscript not accepted (discussion: closed, 7 comments)
Short summary
Short summary
Ground-level ozone is risk air pollutant causing serious oxidative damage of plants when enters through stomata. European mountain forests are exposed to ozone concentrations high enough to injury of sensitive species. We found higher stomatal ozone uptake by montane pines in temperate forests of Tatra Mts (Slovakia) than in Mediterranean forests of Alpes–Mercantour (France). Soil water availability was revealed as relevant driver controlling phytotoxic ozone effect on vulnerable forest species.
06 Nov 2017
African mineral dust sources: a combined analysis based on 3D dust aerosols distributions, winds and surface parameters
Sophie Vandenbussche and Martine De Mazière
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-809, https://doi.org/10.5194/acp-2017-809, 2017
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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This manuscript proposes a new multidisciplinary approach for analysing desert dust aerosols sources. Those aerosols are natural particles uplifted by winds. Part of their emissions is linked to human activities, and they impact significantly our climate. Our method is applied to North-Africa over the years 2008 to 2016, highlighting both the well-known sources and additional small source areas. We also provide the first large-scale (in time and space) analysis of Sahel dust sources.
01 Nov 2017
Characterization of the cloud microphysical and optical properties and aerosol-cloud interaction in the Arctic from in situ ground-based measurements during the CLIMSLIP-NyA campaign, Svalbard
Gwennolé Guyot, Frans Olofson, Peter Tunved, Christophe Gourbeyre, Guy Fevbre, Régis Dupuy, Christophe Bernard, Gérard Ancellet, Kathy Law, Boris Quennehen, Alfons Schwarzenboeck, Kostas Eleftheriadis, and Olivier Jourdan
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-672, https://doi.org/10.5194/acp-2017-672, 2017
Revised manuscript has not been submitted (discussion: closed, 3 comments)
Short summary
Short summary
Cloud and aerosol properties are key parameters in the accelerated arctic warming. In this context, this study will focus on in situ cloud microphysical and optical characterization of arctic Mixed Phase Cloud combined with aerosol measurements and air mass backtrajectory simulations during the ground based CLIMSLIP-NyA campaign performed in Ny-Alesund, Svalbard. The goal is to parameterize the arctic aerosol-cloud interaction and assess the influence of anthropogenic pollution.
27 Oct 2017
Global impact of monocyclic aromatics on tropospheric composition
David Cabrera-Perez, Domenico Taraborrelli, Jos Lelieveld, Thorsten Hoffmann, and Andrea Pozzer
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-928, https://doi.org/10.5194/acp-2017-928, 2017
Revised manuscript not accepted (discussion: closed, 6 comments)
Short summary
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Aromatic compounds are present in rural and urban atmospheres. The aim of this work is to disentangle the impacts of these compounds in different important atmospheric chemical species with the help of a numerical model. Aromatics have low impact OH, NOx and Ozone concentrations in the global scale (below 4 %). The impact however is larger in the regional scale (up to 10 %). The largest impact is in glyoxal and NO3 concentrations, with changes up to 10 % globally and 40 % regionally.
16 Oct 2017
Health and Economic Impacts of Ozone Pollution in China: a provincial level analysis
Yang Xie, Hancheng Dai, Yanxu Zhang, Tatsuya Hanaoka, and Toshihiko Masui
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-849, https://doi.org/10.5194/acp-2017-849, 2017
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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This study quantifies the health and economic effects of ozone pollution at China's regional level and compares them with the impacts from PM2.5. Results show that lower income western provinces encounter severer health impacts and economic burdens due to high natural background concentration, whereas the impact in southern and central provinces is lower. We conclude that health and economic impacts of ozone pollution are significantly lower than PM2.5, but are much more difficult to mitigate.
16 Oct 2017
Estimating Surface Carbon Fluxes Based on a Local Ensemble Transform Kalman Filter with a Short Assimilation Window and a Long Observation Window
Yun Liu, Eugenia Kalnay, Ning Zeng, Ghassem Asrar, Zhaohui Chen, and Binghao Jia
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-888, https://doi.org/10.5194/acp-2017-888, 2017
Preprint withdrawn (discussion: closed, 1 comment)
Short summary
Short summary
We developed a new Carbon data assimilation system to estimate the surface carbon fluxes using the LETKF and GEOS-Chem model, which uses a new scheme with a short
assimilation windowand a long
observation window. The analysis is more accurate with the short assimilation window and is exposed to the future observations accelerating the spin up. In OSSE, the system reduces significantly the analysis error, suggesting that this method could be used in other data assimilation problems.
28 Sep 2017
Effect assessment of NOx and SO2 control policies on acid species in precipitation from 2005 to
2016 in China based on satellite monitoring
Xiuying Zhang, Dongmei Chen, Lei Liu, Limin Zhao, and Wuting Zhang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-770, https://doi.org/10.5194/acp-2017-770, 2017
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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This study might be the first time to evaluate the effects of NOx and SO2 policies on acid species in precipitation in China from 2005 to 2016 on a nation scale, based on the remotely sensed data. The ratio of S to N decrease from 2005 to 2016, while the potential acidity increase from 2005 to 2011, then decrease until 2016. This study confirms that the only controlling SO2 emissions might not be an effect way to decrease acid rain pollution, but the joint controlling SO2 and NO2 does.
18 Sep 2017
Variations in the physicochemical and optical properties of natural
aerosols in Puerto Rico – Implications for climate
Héctor Rivera, John A. Ogren, Elisabeth Andrews, and Olga L. Mayol-Bracero
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-703, https://doi.org/10.5194/acp-2017-703, 2017
Preprint withdrawn (discussion: closed, 2 comments)
Short summary
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To lower the climate uncertainty by aerosols, we evaluated the radiative-forcing properties of aerosols in Puerto Rico analyzing their means and variability vs. amount, sizes, and light absorbing properties. Mean amounts, sizes, and absorbing properties differed among aerosol classes in the marine boundary layer and atmospheric column. Coarse African dust produced 50 % more cooling at the top of the atmosphere and temperature changes 50 % greater than volcanic ash within the marine boundary layer.
15 Sep 2017
On the Freezing Time of Supercooled Drops in Developing Convective Clouds
Jing Yang, Zhien Wang, and Andrew Heymsfield
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-714, https://doi.org/10.5194/acp-2017-714, 2017
Revised manuscript not accepted (discussion: closed, 6 comments)
Short summary
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This study shows the freezing time is longer for large drops than small drops. Due to instrumental limitations, freezing drops cannot be identified until they exhibit obvious shape deformation. In models, drop freezing is assumed to be instantaneous, which is not realistic; thus, the model yields a broader
first icePSD than is observed. This study allows us to interpret the observed ice PSDs in developing convective clouds, and notes the deficiency of instantaneous drop freezing in models.
30 Aug 2017
Air pollution near arterial roads: An experimental and modelling study
José Ignacio Huertas Cardozo and Daniel Fernando Prato Sánchez
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-753, https://doi.org/10.5194/acp-2017-753, 2017
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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Near roads pollution is a concern for the environmental authorities around the world. A methodology has been implemented in a numerical model simulation to predict the concentration levels downwind the road, study the pollutant dispersion phenomena and quantify the impacted area. It was found that pollutant dispersion can be described by a beta function. This model is useful to identify mitigating and adaptive countermeasures and to improve the accuracy of vehicular emission factors.
28 Aug 2017
Evolution of NOx in the Denver Urban Plume during the Front Range Air Pollution and Photochemistry Experiment
Carlena J. Ebben, Tamara L. Sparks, Paul J. Wooldridge, Teresa L. Campos, Christopher A. Cantrell, Roy L. Mauldin, Andrew J. Weinheimer, and Ronald C. Cohen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-671, https://doi.org/10.5194/acp-2017-671, 2017
Revised manuscript has not been submitted (discussion: closed, 2 comments)
Short summary
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We use observations from the FRAPPÉ campaign to examine the evolution of reactive nitrogen as it is transported from Denver. We provide estimates for dilution rates, chemical lifetimes, and deposition rates. While dilution is the primary loss process in the immediate outflow from Denver, chemically, a majority of NOx is converted to HNO3 and is subsequently deposited. Understanding the evolution of reactive nitrogen informs how urban emissions affect air quality in the surrounding regions.
01 Aug 2017
Resolving ozone vertical gradients in air quality models
Katherine R. Travis, Daniel J. Jacob, Christoph A. Keller, Shi Kuang, Jintai Lin, Michael J. Newchurch, and Anne M. Thompson
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-596, https://doi.org/10.5194/acp-2017-596, 2017
Preprint retracted (discussion: closed, 3 comments)
Short summary
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Models severely overestimate surface ozone in the Southeast US during summertime which has implications for the design of air quality regulations. We use a model (GEOS-Chem) to interpret ozone observations from a suite of observations taken during August–September 2013. The model is unbiased relative to observations below 1 km but is biased high at the surface. We attribute this bias to model representation error, an underestimate in low-cloud, and insufficient treatment of vertical mixing.
25 Jul 2017
Investigation on the abnormal quasi-two day wave activities during sudden stratospheric warming period of January 2006
Sheng-Yang Gu, Xiankang Dou, and Dora Pancheva
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-563, https://doi.org/10.5194/acp-2017-563, 2017
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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We used the NOGAPS-ALPHA reanalysis datasets upto mesopause region to investigate the anomalous Quasi-Two-Day Wave (QTDW) activities during the major Sudden Stratospheric Warming period of January 2006. We found that the SSW in the winter stratosphere could have significant influence on the QTDWs in the summer mesosphere through inter-hemispheric couplings. Our finding sheds new light on the coulings during SSW period.
07 Jul 2017
Estimating the effects of aerosol, cloud, and water vapor on the
recent brightening in India during the monsoon season
Feiyue Mao, Zengxin Pan, Wei Wang, Xin Lu, and Wei Gong
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-429, https://doi.org/10.5194/acp-2017-429, 2017
Revised manuscript not accepted (discussion: closed, 6 comments)
05 Jul 2017
Significant Seasonal Change in Optical Properties by atmospheric humic-like substances (HULIS) in Water-Soluble Organic Carbon Aerosols
Heejun Han and Guebuem Kim
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-554, https://doi.org/10.5194/acp-2017-554, 2017
Revised manuscript has not been submitted (discussion: closed, 6 comments)
Short summary
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This paper evaluates significant seasonal changes in atmospheric humic-like substance (HULIS) and water-soluble organic carbon (WSOC) in Seoul, Korea. We found that these changes were greatly induced by UV radiation over different seasons, and this was further confirmed by a laboratory experiment. Our results suggest that photochemical degradation plays a significant role in HULIS abundances in the atmosphere and might be an important removal mechanism of light-absorbing organic aerosols.
20 Jun 2017
A 3D particle Monte Carlo approach to studying nucleation
Christoph Köhn, Martin Bødker Enghoff, and Henrik Svensmark
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-269, https://doi.org/10.5194/acp-2017-269, 2017
Preprint withdrawn (discussion: closed, 8 comments)
19 Jun 2017
Influence of common assumptions regarding aerosol composition and mixing state on predicted CCN concentration
Manasi Mahish, Anne Jefferson, and Don Collins
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-516, https://doi.org/10.5194/acp-2017-516, 2017
Preprint withdrawn (discussion: closed, 3 comments)
15 Jun 2017
Influence of NO2 on secondary organic aerosol formation from ozonolysis of limonene
Changjin Hu, Qiao Ma, Zhi Liu, Yue Cheng, Liqing Hao, Nana Wei, Yanbo Gai, Xiaoxiao Lin, Xuejun Gu, Weixiong Zhao, Mingqiang Huang, Zhenya Wang, and Weijun Zhang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-433, https://doi.org/10.5194/acp-2017-433, 2017
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
Short summary
The effect of NO2 on SOA formation from oxidation of limonene is found to be related to the competition between O3- and NO3-initiated oxidation as well as the competition between RO2 + HO2 and RO2 + NO2 (or NO3) following the initial ozonolysis, and organic nitrates is believed to play an important role in aerosol particle formation. It is suggested that SOA formation in the regions with substantial anthropogenic-biogenic interactions should be evaluated more systematically than before.
12 Jun 2017
Inter-annual variation of aerosol pollution in East Asia and
its relation with strong/weak East Asian winter monsoon
Min Xie, Lei Shu, Tijian Wang, Da Gao, Shu Li, Bingliang Zhuang, Anning Huang, Dexian Fang, Yong Han, Mengmeng Li, Pulong Chen, Zhijun Liu, Zheng Wu, and Hua Lu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-500, https://doi.org/10.5194/acp-2017-500, 2017
Preprint withdrawn (discussion: closed, 3 comments)
Short summary
Short summary
The spatial distribution of aerosol can be affected by monsoon circulation. With the aid of a EAWM index, the stong and the weak EAWM years are identified. The long-term trend of weakening EAWM may potentially increase the aerosol loading in YRD, BTH and SCB but decrease AOD in PRD. By using RegCCMS, we further prove that the intensity of EAWM has great impacts on the spatial distribution of aerosols. The change pattern is mainly decided by the change of aerosols in lower troposphere.
06 Jun 2017
Inconsistent decadal variations between surface and free tropospheric nitrogen oxides over United States
Zhe Jiang, Helen Worden, John R. Worden, Daven K. Henze, Dylan B. A. Jones, Avelino F. Arellano, Emily V. Fischer, Liye Zhu, Kazuyuki Miyazaki, K. Folkert Boersma, and Vivienne H. Payne
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-382, https://doi.org/10.5194/acp-2017-382, 2017
Preprint withdrawn (discussion: closed, 1 comment)
Short summary
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We investigated the variation of US tropospheric NO2 in the past decade. We demonstrated significant divergence between the time variation in tropospheric NO2 columns from OMI retrievals and surface measurements. Our analysis suggests limited contributions from local effects such as fossil fuel emissions, lightning, or instrument artifacts, and indicates possible important contributions from long-range transport of Asian emissions that are modulated by ENSO.
23 May 2017
Statistics of vertical velocities in supercooled cloud layers over Leipzig and Praia measured with Doppler lidar
Johannes Bühl, Patric Seifert, Ronny Engelmann, Julia Fruntke, and Albert Ansmann
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-230, https://doi.org/10.5194/acp-2017-230, 2017
Revised manuscript not accepted (discussion: closed, 6 comments)
Short summary
Short summary
Vertical air motion is a key driver of physical processes in clouds. The stability of clouds and the process of ice formation have been shown to depend critically on vertical air motions. However, observations of vertical air motions and ice formation in clouds are rare. This motivated us in the Up- and downdraft in Drop and Ice Nucleation Experiment (UDINE) to deliver a comprehensive statistics, connecting remote-sensing observations of vertical motions and ice formation.
22 May 2017
Diagnosing CH4 models using the equivalent length in the
stratosphere
Zhiting Wang, Thorsten Warneke, Bart Dils, Justus Notholt, and Marielle Saunois
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-435, https://doi.org/10.5194/acp-2017-435, 2017
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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It is important to know to what extent the chemistry transport model represents tracer transport in the atmosphere correctly. In this study we evaluate performances of three models in the stratosphere in describing mixing processes there. The results reveal that deficiencies exist in representing mixing processes in mid-latitudes of southern stratosphere. Another related problem of the models is in representing tracer gradients across transport barrier.
22 May 2017
Understanding aerosol-cloud interactions in the development of orographic cumulus congestus during IPHEx
Yajuan Duan, Markus D. Petters, and Ana P. Barros
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-396, https://doi.org/10.5194/acp-2017-396, 2017
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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To investigate aerosol-cloud interactions in cumulus development, a new cloud parcel model is developed to predict the vertical structure of cloud formation at early stages and evaluated against airborne observations during the Integrated Precipitation and Hydrology Experiment over the Southern Appalachian Mountains. The findings provide new insights into determinant factors of mid-day cumulus congestus formation that can explain a large fraction of warm season rainfall in mountainous regions.
05 May 2017
Analyzing trace gas filaments in the Ex-UTLS by 4D-variational
assimilation of airborne tomographic retrievals
Annika Vogel, Jörn Ungermann, and Hendrik Elbern
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-308, https://doi.org/10.5194/acp-2017-308, 2017
Revised manuscript has not been submitted (discussion: closed, 2 comments)
Short summary
Short summary
The potential for chemical state analysis at tropopause heights was investigated by combining airborne tomographic observations with a chemical data-assimilation system in form of a case study. Related developments include the use of potential vorticity for ozone initialization and flow-dependent horizontal correlations. This setup demonstrated substantial improvements in terms of spatial extend and alignment of atmospheric structures down to filamentary foldings along airmass boundaries.
26 Apr 2017
Influence of semi-volatile aerosols on physical and optical properties of aerosols in the Kathmandu Valley
Sujan Shrestha, Siva Praveen Puppala, Bhupesh Adhikary, Kundan Lal Shrestha, and Arnico K. Panday
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-287, https://doi.org/10.5194/acp-2017-287, 2017
Revised manuscript not accepted (discussion: closed, 8 comments)
24 Apr 2017
Increase in the Frequency of Tropical Deep Convective Clouds with Global Warming
Hartmut H. Aumann, Alexander Ruzmaikin, and Ali Behrangi
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-135, https://doi.org/10.5194/acp-2017-135, 2017
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
Short summary
Deep Convective Clouds (DCC) are extreme rain events associated with large thunderstorms. We use Atmospheric Infrared Sounder (AIRS) data to characterize the DCC process in the tropical oceans as function of surface temperature. We use the surface temperature distribution predicted by state-of-art climate models to show that the frequency of DCC in the tropical oceans will increase close to a 50 % by the end of this century, when the surface temperature is predict to be 3 K warmer than now.
19 Apr 2017
Mixing State of Refractory Black Carbon of the North China Plain
Regional Aerosol Combining a Single Particle Soot Photometer and
a Volatility Tandem Differential Mobility Analyzer
Yuxuan Zhang, Hang Su, Simonas Kecorius, Zhibin Wang, Min Hu, Tong Zhu, Kebin He, Alfred Wiedensohler, Qiang Zhang, and Yafang Cheng
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-222, https://doi.org/10.5194/acp-2017-222, 2017
Revised manuscript not accepted (discussion: closed, 7 comments)
Short summary
Short summary
The light absorption of black carbon (BC) strongly depends on their mixing state. By now, the BC mixing state in the atmosphere is still unclear. In this work, we have investigated the comprehensive characterization of BC mixing state at a polluted regional background site of the North China Plain (NCP) based on in site measurements. we found that BC aerosols of the NCP were fully aged, suggesting a strong optical and climate effect of BC on the regional scale in northern China.
12 Apr 2017
Experimental and computational kinetics investigations for the reactions of Cl atoms with series of unsaturated ketones in gas phase
Siripina Vijayakumar, Avinash Kumar, and Balla Rajakuma
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-163, https://doi.org/10.5194/acp-2017-163, 2017
Revised manuscript not accepted (discussion: closed, 6 comments)
Short summary
Short summary
we report the experimentally measured rate coefficients. Theoretically explored all the possible channels and computed the rate coefficients. The estimated atmospheric lifetimes of these unsaturated ketones due to their reactions with atmospheric oxidants are presented. These kinetic parameters will be helpful to understand the atmospheric degradation of unsaturated ketones in the troposphere. Also, the degradation mechanism of these ketones due to their oxidation with Cl atoms is proposed.
03 Apr 2017
Coupled Chemistry-Climate Effects from 2050 Projected Aviation Emissions
Andrew Gettelman, Chih-Chieh Chen, Mark Z. Jacobson, Mary A. Cameron, Donald J. Wuebbles, and Arezoo Khodayari
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-218, https://doi.org/10.5194/acp-2017-218, 2017
Revised manuscript not accepted (discussion: closed, 5 comments)
Short summary
Short summary
Aviation emissions create several impacts on climate. Condensation trails (contrails) are aviation produced cirrus clouds. Aircraft also emit aerosols, including soot (black carbon) and sulfate. Analyses of the climate effects of 2050 aviation emissions have been conducted with two coupled Chemistry Climate Models (CCMs) including experiments with coupled ocean models.
27 Mar 2017
Dependence of the hygroscopicity parameter κ on particle size, humidity and solute concentration: implications for laboratory experiments, field measurements and model studies
Zhibin Wang, Yafang Cheng, Nan Ma, Eugene Mikhailov, Ulrich Pöschl, and Hang Su
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-253, https://doi.org/10.5194/acp-2017-253, 2017
Revised manuscript has not been submitted (discussion: closed, 2 comments)
27 Mar 2017
Sub-seasonal Variability in the Boundary Layer Sources for Transport into
the Tropopause Layer in the Asian Monsoon Region
Bin Chen, Bärbel Vogel, Xiangde Xu, and Shuai Yang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-216, https://doi.org/10.5194/acp-2017-216, 2017
Revised manuscript has not been submitted (discussion: closed, 3 comments)
Short summary
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The Asian summer monsoon anticyclone is associated with a region in which surface emissions have been shown to enter the lower stratosphere in the Northern Hemisphe.We quantitatively characterized the properties of troposphere-to-stratosophere transport in term of the climatological sources and its variability in sub-seasoanal scale. This is the first attempt to examine the spatiotemporal evolution of convection sources at the sub-seasonal scale, particularly from a climatologic perspective.
21 Mar 2017
On biases in atmospheric CO inversions assimilating MOPITT satellite retrievals
Yi Yin, Frederic Chevallier, Philippe Ciais, Gregoire Broquet, Anne Cozic, Sophie Szopa, and Yilong Wang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-166, https://doi.org/10.5194/acp-2017-166, 2017
Revised manuscript not accepted (discussion: closed, 12 comments)
Short summary
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CO inverse modelling studies have so far reported significant discrepancies between model concentrations optimised with the Measurement of Pollution in the Troposphere (MOPITT) satellite retrievals and surface in-situ measurements. Here, we assess how well a global CTM fits a large variety of independent CO observations before and after assimilating MOPITTv6 retrievals to optimise CO sources/sink and discuss potential sources of errors and their implications for global CO modelling studies.
16 Mar 2017
First Look at the Occurrence of Horizontally Oriented Ice Crystals over Summit, Greenland
Sebastian Cole, Ryan R. Neely III., and Robert A. Stillwell
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-1134, https://doi.org/10.5194/acp-2016-1134, 2017
Preprint withdrawn (discussion: closed, 3 comments)
09 Mar 2017
The Interactions Between Precipitation, Vegetation and Dust Emission Over Semi-Arid Mongolia
Yuki Sofue, Buho Hoshino, Yuta Demura, Eunice Nduati, and Akihiko Kondoh
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-83, https://doi.org/10.5194/acp-2017-83, 2017
Revised manuscript not accepted (discussion: closed, 13 comments)
Short summary
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The purpose of this study is to examine the relationship between the trend of vegetation variation and the effects of precipitation in the Gobi region. In the Gobi region, precipitation is confined to the period from May to September. We compared the patterns of interactions between precipitation and normalized difference vegetation index (NDVI) for a period of 29 years (between 1985–2013).
09 Mar 2017
NO2 pollution over India observed from space – the impact of rapid economic growth, and a recent decline
Andreas Hilboll, Andreas Richter, and John P. Burrows
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-101, https://doi.org/10.5194/acp-2017-101, 2017
Revised manuscript has not been submitted (discussion: closed, 4 comments)
Short summary
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We investigate the temporal evolution of the important tropospheric air pollutant nitrogen dioxide (NO2) since the early 2000s, and correlate NO2 abundances with indicators of economic development. Until 2012, NO2 pollution and economic growth are strongly correlated, with annual increases of up to 4.4 %. Since then, tropospheric NO2 pollution has stabilized or is even declining, probably as a result of a slow-down in Indian economic growth combined with the implementation of cleaner technology.
21 Feb 2017
Stratospheric Aerosol Climatology over Ethiopia and Retrieval of its Size Distribution
Milkessa Gebeyehu Homa, Gizaw Mengistu Tsidu, and Derese Tekestebrihan Nega
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-133, https://doi.org/10.5194/acp-2017-133, 2017
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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This article provides aerosol climatology of Ethiopia for 21 years. The result showed that aerosol loading over the region is steadily increasing in different sizes. The dominant radius of the particulate matters are between 0.452–0.525 μm, & dominated by reflective type aerosol. This influence the solar radiation budget of the earth, which in turn influences the Earth's climate in different ways. Hence, it is the right time to give the right attention to air quality & climate change impacts.
15 Feb 2017
Measurement-based modeling of daytime and nighttime oxidation of atmospheric mercury
Maor Gabay, Mordechai Peleg, Erick Fredj, and Eran Tas
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-39, https://doi.org/10.5194/acp-2017-39, 2017
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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Accurate characterization of atmospheric mercury oxidation pathways and their kinetics is critically important for assessing the transfer of atmospheric mercury to bioaquatic systems, where it can be further converted into the highly toxic biocumulative, methyl mercury. We show that nighttime oxidation of atmospheric mercury and daytime oxidation by hydroxyl radical are both more important than has been previously reported. These findings should eventually affect mercury deposition assessment.
30 Jan 2017
Quantifying the global atmospheric power budget
Anastassia M. Makarieva, Victor G. Gorshkov, Andrei V. Nefiodov, Douglas Sheil, Antonio Donato Nobre, and Bai-Lian Li
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-17, https://doi.org/10.5194/acp-2017-17, 2017
Revised manuscript not accepted (discussion: closed, 11 comments)
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Why the Earth's atmospheric power – the rate at which solar energy is converted to wind – takes the value it does has long challenged theorists. We identify distinct terms in the atmospheric power budget and highlight their meaning and implications. We note problems with past estimates of this global power and generate our own for 1979–2015 using available gridded data. Spatial changes in atmospheric moisture, such as those caused by forest loss, will impact wind power, circulation and climate.
23 Jan 2017
Tropospheric NO2 concentrations over West Africa are influenced by climate zone and soil moisture variability
Ajoke R. Onojeghuo, Heiko Balzter, and Paul S. Monks
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-1128, https://doi.org/10.5194/acp-2016-1128, 2017
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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This research focused on the identifying seasonality and linear trends of NO2 and soil moisture across West Africa using satellite data. A strong effect of soil moisture on tropospheric NO2 variations in arid steppe and desert zones has been shown. Recent increasing trends in NO2 over arid steppe/desert areas are more likely connected to fertilizer induced afforestation from the Sahel green wall initiative than soil moisture variations.
16 Jan 2017
Heterogeneous freezing of super cooled water droplets in micrometre range-freezing on a chip
Thomas Häusler, Lorenz Witek, Laura Felgitsch, Regina Hitzenberger, and Hinrich Grothe
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-31, https://doi.org/10.5194/acp-2017-31, 2017
Preprint retracted (discussion: closed, 7 comments)
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Clouds play a major role for the Earth's climate system. On this account, it is important to fully understand the mechanisms taking place in a cloud. We are presenting a new approach to efficiently investigate the freezing processes in ice clouds, i.e. the behavior of ice nuclei. The new set-up exhibits its strength in reproducibility and accuracy. Finally, it opens a temperature window down to −37 °C for freezing experiments which was not accessible with many former approaches.
10 Jan 2017
A statistical approach for estimating representative emission rates of biogenic volatile organic compounds and their determination for 192 plant species/genera in China
Lingyu Li, Yaqi Li, and Shaodong Xie
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-1116, https://doi.org/10.5194/acp-2016-1116, 2017
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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Field measurements of BVOC emissions from 50 plant species in China were performed using a semi-static enclosure system. A statistical approach to estimate the representative emission rates applied in the BVOC emission inventories were developed. The emission intensity categories were produced with more detailed categories, accurate emission rate intervals and representative rates. Isoprene and monoterpene emission rates of 192 plant species/genera in China were determined.
10 Jan 2017
Characterisation of Central-African aerosol and trace-gas emissions
based on MAX-DOAS measurements and model simulations over
Bujumbura, Burundi
Clio Gielen, François Hendrick, Gaia Pinardi, Isabelle De Smedt, Caroline Fayt, Christian Hermans, Trissevgeni Stavrakou, Maite Bauwens, Jean-Francois Müller, Eugène Ndenzako, Pierre Nzohabonayo, Rachel Akimana, Sebastien Niyonzima, Michel Van Roozendael, and Martine De Mazière
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-1104, https://doi.org/10.5194/acp-2016-1104, 2017
Revised manuscript has not been submitted (discussion: closed, 2 comments)
Short summary
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In this paper we study the composition of the lower atmosphere above the Central-African capital city of Burundi (Bujumbura) by measuring the amount of aerosol dust particles and trace gases in the air.
We find that the aerosol and trace gas seasonal and daily variation is driven by the alternation of rain periods and dry periods associated with intense biomass burning in the vicinity of Bujumbura, and the influence of human activities in the city center.
02 Jan 2017
Overview of the European framework for online integrated air quality and meteorology modelling (EuMetChem)
Alexander Baklanov
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-1174, https://doi.org/10.5194/acp-2016-1174, 2017
Preprint retracted (discussion: closed, 3 comments)
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The article provides an introduction to the COST Action ES1004 – European framework for online integrated air quality and meteorology modelling (EuMetChem) – goals and outcomes for this Special Issue "Coupled chemistry–meteorology modelling: status and relevance for numerical weather prediction, air quality and climate communities" which collects key scientific papers of EuMetChem and its collaborators from different continents.
02 Jan 2017
Four years of atmospheric mercury records in Northwestern
Patagonia (Argentina): potential sources, concentration patterns and
influence of environmental variables observed at the GMOS EMMA
station
Maria C. Diéguez, Patricia E. Garcia, Mariantonia Bencardino, Francesco D'Amore, Jessica Castagna, Sergio Ribeiro Guevara, and Francesca Sprovieri
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-1076, https://doi.org/10.5194/acp-2016-1076, 2017
Preprint withdrawn (discussion: closed, 2 comments)
Short summary
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First continuous records of gaseous elemental Hg (GEM) concentrations monitored at the GMOS EMMA monitoring station in Nahuel Huapi National Park (Northwestern Patagonia, Argentina) showed seasonal and daily variation with mean values higher during spring and winter (ca. 0.92 ng m−3) and higher day-time levels across all seasons. GEM levels were determined by the westerly winds and backward trajectory analysis highlighted the influence of clean oceanic air masses and volcanoes in the Andes.
12 Dec 2016
Widespread persistent polar stratospheric ice clouds in the Arctic
Christiane Voigt, Andreas Dörnbrack, Martin Wirth, Silke M. Groß, Robert Baumann, Benedikt Ehard, Michael C. Pitts, Lamont R. Poole, Björn-Martin Sinnhuber, and Hermann Oelhaf
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-1082, https://doi.org/10.5194/acp-2016-1082, 2016
Revised manuscript not accepted (discussion: closed, 6 comments)
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The letter describes unprecedented observations of widespread and persistent polar stratospheric ice clouds (ice PSCs) in the exceptionally cold Arctic stratospheric winter 2015/16. The unique observations are of global relevance because trends in Arctic ozone loss and in polar temperatures are highly uncertain. The new observations at cold conditions serve to enhance our knowledge on ice PSC formation, Arctic ozone loss and polar stratrospheric temperatures in a changing climate.
08 Dec 2016
CALIPSO observations of the dependence of homo- and
heterogeneous ice nucleation in cirrus clouds on latitude, season
and surface condition
David L. Mitchell, Anne Garnier, Melody Avery, and Ehsan Erfani
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-1062, https://doi.org/10.5194/acp-2016-1062, 2016
Revised manuscript not accepted (discussion: closed, 3 comments)
Short summary
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Although the main objective of our DOE/Atmospheric Systems Research project was to use aircraft measurements to determine the formation (i.e. ice nucleation) mechanism of cirrus clouds, it soon became evident that the formation mechanism will depend on latitude, season and surface topography. A new satellite remote sensing method was developed to discover this dependency, which shows that roughly half or more of the cirrus clouds at high latitudes form through homogeneous ice nucleation.
07 Dec 2016
Effects of wintertime polluted aerosol on cloud over the Yangtze River Delta: case study
Chen Xu, Junyan Duan, Yanyu Wang, Yifan Wang, Hailin Zhu, Xiang Li, Lingdong Kong, Qianshan He, Tiantao Cheng, and Jianmin Chen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-968, https://doi.org/10.5194/acp-2016-968, 2016
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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We intensively examined the influence of polluted aerosol on cloud and precipitation on different underlying surfaces and evaluated relationship between aerosol types and physical properties of clouds under different atmospheric conditions over the YRD. Aerosol plays an important role in cloud evolution in the low layers of troposphere (below 5 km) in the case of the stable atmosphere in wintertime.The results are helpful to in-depth understanding of aerosol indirect effects in Asian.
24 Nov 2016
Implications on atmospheric dynamics and the effect on black carbon transport into the Eurasian Arctic based on the choice of land surface model schemes and reanalysis data in model simulations with WRF
Carolina Cavazos Guerra, Axel Lauer, Andreas B. Herber, Tim M. Butler, Annette Rinke, and Klaus Dethloff
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-942, https://doi.org/10.5194/acp-2016-942, 2016
Revised manuscript has not been submitted (discussion: closed, 3 comments)
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Accurate description of the Arctic atmosphere is a challenge for the modelling comunity. We evaluate the performance of the Weather Research and Forecast model (WRF) in the Eurasian Arctic and analyse the implications of data to initialise the model and a land surface scheme. The results show that biases can be related to the quality of data used and in the case of black carbon concentrations, to emission data. More long term measurements are need for model Validation in the area.
15 Nov 2016
Residual Mean Circulation and Temperature Changes during the Evolution of Stratospheric Sudden Warming Revealed in MERRA
Byeong-Gwon Song and Hye-Yeong Chun
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-729, https://doi.org/10.5194/acp-2016-729, 2016
Revised manuscript not accepted (discussion: closed, 6 comments)
14 Nov 2016
Large-scale atmospheric circulation control on stable water isotopes in precipitation over the northwestern and southeastern Tibetan Plateau
Xiaoxin Yang, Sunil Acharya, and Tandong Yao
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-876, https://doi.org/10.5194/acp-2016-876, 2016
Revised manuscript has not been submitted (discussion: closed, 3 comments)
26 Oct 2016
Stratospheric Variability at a glance – Analysis of the
intra decadal timescale and the QBO
Duy Cai, Martin Dameris, Hella Garny, Felix Bunzel, Patrick Jöckel, and Phoebe Graf
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-870, https://doi.org/10.5194/acp-2016-870, 2016
Revised manuscript not accepted (discussion: closed, 8 comments)
Short summary
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Reliable information on weather and climate are of increasing interest for economy, politics and society.
In particular decadal timescales become more and more important. This study focuses on stratospheric processes relevant for the dynamical variability on intra decadal timescale. We apply a so called power spectra analysis. With this method and further analyses we could determine a minimum vertical resolution for numerical models, which is required to capture these processes.
10 Oct 2016
Identification of dust sources and hotspots in East Asia during 2000–2015: implications for numerical modeling and forecasting
Xuelei Zhang, Daniel Q. Tong, Guangjian Wu, Xin Wang, Aijun Xiu, Yongxiang Han, Tianli Xu, Shichun Zhang, and Hongmei Zhao
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-681, https://doi.org/10.5194/acp-2016-681, 2016
Revised manuscript has not been submitted (discussion: closed, 2 comments)
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More detailed knowledge regarding recent variations in the characteristics of East Asian dust events and dust sources can effectively improve regional dust modeling and forecasts. Here we reassess the accuracy of previous predictions of trends in dust variations in East Asia, and establish a relatively detailed inventory of dust events based on satellite observations from 2000 to 2015.
29 Sep 2016
Nighttime Mesospheric Ozone During the 2002 Southern Hemispheric Major Stratospheric Warming
Christine Smith-Johnsen, Yvan Orsolini, Frode Stordal, Varavut Limpasuvan, and Kristell Pérot
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-758, https://doi.org/10.5194/acp-2016-758, 2016
Preprint withdrawn (discussion: closed, 4 comments)
Short summary
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Mesospheric ozone enhancements during sudden stratospheric warmings in the northern hemisphere have been reported in the literature. In the southern hemisphere, only one warming event has occurred, and this paper is the first to explain the mesospheric ozone enhancement during this event in 2002, using both a whole atmosphere chemistry climate model and satellite observations from GOMOS.
28 Sep 2016
Sensitivity of particle loss to the Kelvin effect in LES of young
contrails
Aniket R. Inamdar, Alexander D. Naiman, Sanjiva K. Lele, and Mark Z. Jacobson
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-817, https://doi.org/10.5194/acp-2016-817, 2016
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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Various LES models are used to study the physics of contrail evolution in a bid to help reduce the uncertainty in their predicted climate impact. However, the sensitivity of contrail properties to simulation parameters as predicted by different LES models is discrepant. This paper carefully isolates the cause of these discrepancies – different modeling of the Kelvin effect in these LES models. Different modeling of the Kelvin effect is shown to substantially alter important contrail properties.
15 Sep 2016
A multi-model approach to monitor emissions of CO2 and CO in an urban-industrial complex
Ingrid Super, Hugo A. C. Denier van der Gon, Michiel K. van der Molen, Hendrika A. M. Sterk, Arjan Hensen, and Wouter Peters
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-807, https://doi.org/10.5194/acp-2016-807, 2016
Revised manuscript not accepted (discussion: closed, 3 comments)
09 Sep 2016
Synoptic perspectives on pollutant transport patterns observed by satellites over East Asia: Case studies with a conceptual model
Hyun Cheol Kim, Soontae Kim, Seok-Woo Son, Pius Lee, Chun-Sil Jin, Eunhye Kim, Byeong-Uk Kim, Fong Ngan, Changhan Bae, Chang-Keun Song, and Ariel Stein
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-673, https://doi.org/10.5194/acp-2016-673, 2016
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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In recent years, frequent occurrence of severe haze events in East Asia is one of the most serious public concerns in this region. We demonstrate that daily pollutant transport patterns in East Asia are visible from satellite images when inspected with corresponding synoptic weather analyses. Our manuscript focuses on the possible role of meteorology, especially by the routine passages of synoptic systems, on the production and removal of regional pollution in East Asia.
05 Sep 2016
Increasing boreal wetland emissions inferred from reductions in atmospheric CH4 seasonal cycle
J. M. Barlow, P. I. Palmer, and L. M. Bruhwiler
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-752, https://doi.org/10.5194/acp-2016-752, 2016
Revised manuscript has not been submitted (discussion: closed, 2 comments)
Short summary
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We report significant changes in the amplitude of the atmospheric CH4 seasonal cycle at sites over the Arctic. All corresponding evidence points to a persistent increase in wetlands. We show using a global 3-d chemistry transport model that reductions in North American and European fossil fuel emissions could explain a large portion of the amplitude decrease, but we still require significant, persistent emissions from wetlands to reconcile observed trends in the seasonal cycle.
05 Sep 2016
Urbanization effect on sunshine duration during global dimming and
brightening periods in China
Yawen Wang, Martin Wild, Arturo Sanchez-Lorenzo, Yonghui Yang, Veronica Manara, and Dandan Ren
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-657, https://doi.org/10.5194/acp-2016-657, 2016
Revised manuscript not accepted (discussion: closed, 6 comments)
Short summary
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The strong decadal variations in surface solar radiation, known as "global dimming and brightening", are considered to be related to anthropogenic activities. Based on a comprehensive set of sunshine duration measurements in China, the present study investigates to what extent these changes occurred, only in cities or also in remote areas. The quantification of this "urbanization effect" enables a more accurate determination of the large scale variations of surface solar radiation over China.
30 Aug 2016
Relating atmospheric N2O concentration to N2O emission strength in the U. S. Corn Belt
Congsheng Fu, Xuhui Lee, Timothy J. Griffis, Edward J. Dlugokencky, and Arlyn E. Andrews
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-761, https://doi.org/10.5194/acp-2016-761, 2016
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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To the best of our knowledge, no modeling studies have been published on the relationship between the spatial characteristics of agricultural N2O emissions and the atmospheric N2O mixing ratio at the regional scale. To fill this gap, we proposed a simple inverse analysis method based on tower measurements and an Eulerian model. According to our study, the N2O emissions from the U. S. Corn Belt is clearly estimated by IPCC, and such underestimate is not dependent on tower measurement location.
10 Aug 2016
Characteristics of Ground Ozone Concentration over Beijing from 2004 to
2015: Trends, Transport, and Effects of Reductions
Nianliang Cheng, Yunting Li, Dawei Zhang, Tian Chen, Feng Sun, Chen Chen, and Fan Meng
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-508, https://doi.org/10.5194/acp-2016-508, 2016
Preprint retracted (discussion: closed, 4 comments)
Short summary
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1. Trends of ground-level ozone in Beijing from 2004 to 2015 were first analyzed.
2. Difference between urban sites and background site of ozone in Beijing was becoming smaller.
3. Changes in ozone and its precursors in Beijing during the period of regional air quality assurance period were compared and analyzed. As regional-scale emission reduction measures were highly effective in improving air quality in Beijing, the future direction of air pollution control is regional control.
18 Jul 2016
Vertical and horizontal variation of aerosol number size distribution in the boreal environment
Riikka Väänänen, Radovan Krejci, Hanna E. Manninen, Antti Manninen, Janne Lampilahti, Stephany Buenrostro Mazon, Tuomo Nieminen, Taina Yli-Juuti, Jenni Kontkanen, Ari Asmi, Pasi P. Aalto, Petri Keronen, Toivo Pohja, Ewan O'Connor, Veli-Matti Kerminen, Tuukka Petäjä, and Markku Kulmala
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-556, https://doi.org/10.5194/acp-2016-556, 2016
Revised manuscript has not been submitted (discussion: closed, 6 comments)
Short summary
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A light aircraft was used as a platform to explore the horizontal and vertical variability of the aerosol particles over a boreal forest in Central Finland. This information is needed when data measured at ground level station is extrapolated and parameterized to represent the
conditions of the larger scale. The measurements showed that despite local fluctuations there was a good agreement between the on-ground and airborne measurements inside the planetary boundary layer.
15 Jul 2016
Temperature-dependence of aerosol optical depth over the southeastern US
Tero Mielonen, Anca Hienola, Thomas Kühn, Joonas Merikanto, Antti Lipponen, Tommi Bergman, Hannele Korhonen, Pekka Kolmonen, Larisa Sogacheva, Darren Ghent, Antti Arola, Gerrit de Leeuw, and Harri Kokkola
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-625, https://doi.org/10.5194/acp-2016-625, 2016
Revised manuscript not accepted (discussion: closed, 6 comments)
Short summary
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We studied the temperature dependence of AOD and its radiative effects over the southeastern US. We used spaceborne observations of AOD, LST and tropospheric NO2 with simulations of ECHAM-HAMMOZ. The level of AOD in this region is governed by anthropogenic emissions but the temperature dependency is most likely caused by BVOC emissions. According to the observations and simulations, the regional clear-sky DRE for biogenic aerosols is −0.43 ± 0.88 W/m2/K and −0.86 ± 0.06 W/m2/K, respectively.
14 Jul 2016
A Backscatter Lidar Forward Operator for Particle-Representing Atmospheric Chemistry Models
Armin Geisinger, Andreas Behrendt, Volker Wulfmeyer, Jens Strohbach, Jochen Förstner, Roland Potthast, and Ina Mattis
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-609, https://doi.org/10.5194/acp-2016-609, 2016
Revised manuscript not accepted (discussion: closed, 5 comments)
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Hereby, we present a new backscatter lidar forward operator which allows for a quantitative comparison of atmospheric chemistry models and backscatter lidar measurements. We applied the operator on model predictions of the 2010 Eyjafjallajökull eruption where the model obviously overestimated the ash concentration. Uncertainties of the operator were minimized by applying averaging algorithms and performing sensitivity studies. Further steps towards quantitative model validation were identified.
13 Jul 2016
Chemical Characteristics of Marine Fine Aerosols over Sea and at Offshore Islands during Three Cruise Sampling Campaigns in the Taiwan Strait– Sea Salts and Anthropogenic Particles
Tsung-Chang Li, Chung-Shin Yuan, Chung-Hsuang Hung, Hsun-Yu Lin, Hu-Ching Huang, and Chon-Lin Lee
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-384, https://doi.org/10.5194/acp-2016-384, 2016
Revised manuscript not accepted (discussion: closed, 4 comments)
Short summary
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This manuscript is significant because it is important to establish data on the background physicochemical characteristics of atmospheric fine particles, as well as their spatial distributions and seasonal variations given various meteorological conditions, and the results of this study will be very much valuable for clarifying the transportation PM2.5 over sea and at the offshore islands at the Taiwan Strait, which can further fill the the important blank for the global atmospheric research.
07 Jul 2016
Numerical Analysis of the Role of Snowpack in the Ozone Depletion Events during the Arctic Spring
Le Cao, Ulrich Platt, Chenggang Wang, Nianwen Cao, and Qing Qin
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-553, https://doi.org/10.5194/acp-2016-553, 2016
Revised manuscript has not been submitted (discussion: closed, 2 comments)
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A snowpack module which represents the mass transfer between the ambient air and the snowpack is implemented in a box model, aiming to clarify the influences of the snowpack on the ozone depletion events (ODEs) and the associated bromine explosion in the springtime of Arctic. The size of snow grains, volume fraction of the liquid-like layer (LLL), and the rate of the mass exchange between the snow interstitial air and the snow particles are shown to be critical parameters.
30 Jun 2016
A long term study of polar ozone loss derived from data assimilation of Odin/SMR observations
Kazutoshi Sagi and Donal Murtagh
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-352, https://doi.org/10.5194/acp-2016-352, 2016
Revised manuscript has not been submitted (discussion: closed, 2 comments)
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This article presents estimated ozones losses in both hemispheres covering the period 2002–2013, the longest series available for a single instrument so far. It covers not only the lower stratosphere where halogen induced loss dominates but also the mid-stratosphere where the effects of NOx are seen. It employs data from the ODIN/SMR 544 GHz ozone product for the first time in order to improve the results in the lowermost stratosphere.
29 Jun 2016
The Nonequilbrium Thermodynamics of Atmospheric Blocking
Andrew Jensen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-491, https://doi.org/10.5194/acp-2016-491, 2016
Revised manuscript has not been submitted (discussion: closed, 8 comments)
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Further studies of the fundamental physics of blocking are needed since they are still incompletely understood. To examine the physical processes, an approach based on nonequilibrium thermodynamics is used. This approach to blocking highlights the thermodynamics, which are often not considered in depth. Results indicate that a thermodynamic perspective of blocking can be characterized by significant entropy production and surface entropy fluxes which may sustain blocking events against demise.
23 Jun 2016
Heterogeneous uptake of amines onto kaolinite in the temperature range of 232–300 K
Y. Liu, Y. Ge, and H. He
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-538, https://doi.org/10.5194/acp-2016-538, 2016
Revised manuscript not accepted (discussion: closed, 5 comments)
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It is unclear about the role of mineral dust in the atmospheric chemistry of amines. Uptake by kaolinite has been found as an innegligible sink of amines based on the measured kinetics in the temperature range of 232–300 K. It reveals that uptake by mineral dust should be considered in models simulating the chemical cycle of amines in the atmosphere in the future. The results will also aid in understanding the possible impacts of amines on human health, air quality, and climate effects.
22 Jun 2016
Brown carbon absorption in the red and near infrared spectral region
A. Hoffer, A. Tóth, M. Pósfai, C. E. Chung, and A. Gelencsér
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-452, https://doi.org/10.5194/acp-2016-452, 2016
Revised manuscript not accepted (discussion: closed, 5 comments)
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Black carbon aerosols (BC) have been conventionally assumed to be the only light-absorbing carbonaceous particles in the atmosphere. Here we report that a specific type of organic aerosol particles from biomass burning also absorb light significantly. Particles were produced in the laboratory and their optical properties were measured. The results infer that the role of BC (including Diesel soot) in climate change has likely been overestimated in global climate models.
20 Jun 2016
Development and Testing of a Passive Sampler for Measurement of Gaseous Mercury
Ingvar Wängberg, Ulla Hageström, Jonas Sommar, and Martin Ferm
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-528, https://doi.org/10.5194/acp-2016-528, 2016
Preprint withdrawn (discussion: closed, 4 comments)
20 Jun 2016
Lidar studies on microphysical influences on the structure and lifetime of tropical cirrus clouds
G. S. Motty, Malladi Satyanarayana, G. S. Jayeshlal, and V. P. Mahadevan Pillai
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-456, https://doi.org/10.5194/acp-2016-456, 2016
Revised manuscript has not been submitted (discussion: closed, 2 comments)
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The important microphysical properties such as extinction coefficient, optical depth, lidar ratio and depolarisation ratio for cirrus clouds obtained during 2005–2010 were analysed using the observations made by the ground based lidar system at NARL Gadanki (13.50° N, 79.20° E) and are compared with the available night time observations from the CALIOP on board the CALIPSO satellite.
15 Jun 2016
Evaluating Vehicle Emission Control Policies using on-Road Mobile Measurements and Continuous Wavelet Transform: a Case Study during the Asia-Pacific Economic Cooperation Forum, China 2014
Ziqiang Tan, Yanwen Wang, Chunxiang Ye, Yi Zhu, Yingruo Li, Pengfei Liang, Qi Wang, Yiqun Han, Yanhua Fang, Junxia Wang, Lei Meng, Yao Wang, and Tong Zhu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-460, https://doi.org/10.5194/acp-2016-460, 2016
Revised manuscript not accepted (discussion: closed, 6 comments)
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We used mobile research platform to evaluate the effectiveness of the strictest vehicle emission control policies ever applied in China during the Asia-Pacific Economic Cooperation Forum, Beijing, China 2014. We applied the continuous wavelet transform (CWT) method to decompose on-road measured concentrations of major air pollutants, and used high frequency signals of the concentrations to represent the "instantaneous emission" from vehicles.
31 May 2016
Experimental study of the aerosol impact on fog microphysics
M. Mazoyer, F. Burnet, G. C. Roberts, M. Haeffelin, J.-C Dupont, and T. Elias
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-103, https://doi.org/10.5194/acp-2016-103, 2016
Preprint withdrawn (discussion: closed, 2 comments)
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Comprehensive field campaigns dedicated to fog life cycle observation were conducted during the winters of 2010–2013 at the SIRTA observatory in the suburb of Paris. The objective of this paper is to evaluate the impact of aerosol particles on the fog microphysics
through an original method. We conclude that the actual supersaturations reached during these fog episodes are too low and no simultaneous increase of aerosols (D > 200 nm) and droplet concentrations can be observed.
31 May 2016
Temperature-dependent diffusion coefficient of H2SO4 in air: laboratory measurements using laminar flow technique
David Brus, Lenka Skrabalova, Erik Herrmann, Tinja Olenius, Tereza Travnickova, and Joonas Merikanto
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-398, https://doi.org/10.5194/acp-2016-398, 2016
Revised manuscript not accepted (discussion: closed, 4 comments)
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We report laboratory measurements of the diffusion coefficient of sulfuric acid in humidified air. To our best knowledge, this is the first study, which investigates systematically the temperature dependency of the diffusion coefficient of H2SO4. We observed a rather strong power dependence with power of 5.4 when compared to 1.75 observed for other gases. We suggest that observed higher temperature dependence might be due to strong clustering of H2SO4 with base-impurities like amines.
27 May 2016
Assessing atmospheric dust modelling performance of WRF-Chem over the semi-arid and arid regions around the Mediterranean
Emmanouil Flaounas, Vassiliki Kotroni, Konstantinos Lagouvardos, Martina Klose, Cyrille Flamant, and Theodore M. Giannaros
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-307, https://doi.org/10.5194/acp-2016-307, 2016
Revised manuscript not accepted (discussion: closed, 5 comments)
25 May 2016
Impact of aerosols on precipitation over the Maritime Continent simulated by a convection-permitting model
Muhammad E. E. Hassim, W. W. Grabowski, and T. P. Lane
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-402, https://doi.org/10.5194/acp-2016-402, 2016
Revised manuscript not accepted (discussion: closed, 4 comments)
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Model simulations show that there is more surface rainfall, less shallow clouds below 3 km and more deep clouds above 9 km in pristine air conditions than in a polluted environment, contrary to previous studies. This is due to more efficient rain processes below the freezing level, enhanced ice growth above and the off-loading of precipitation that increases cloud buoyancy aloft. Our results demonstrate that microphysical effects dominate the aerosol impact on rainfall more than cloud dynamics.
18 May 2016
Investigating the Impacts of Saharan Dust on Tropical Deep Convection Using Spectral Bin Microphysics, Part 1: Ice Formation and Cloud Properties
Matthew Gibbons, Qilong Min, and Jiwen Fan
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-368, https://doi.org/10.5194/acp-2016-368, 2016
Revised manuscript not accepted (discussion: closed, 4 comments)
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Observations suggest cloud systems evolve differently under dusty conditions compared to other aerosols. We have used numerical modeling to study one such case. Dust increases the formation of small sized ice in the mid-troposphere. This enhanced convective intensity, shifted precipitation top height to higher altitudes, and glaciated clouds at lower altitudes. Consistent with observations, average cloud height was lowered due to a greater number of heavy particles forming near the cloud tops.
17 May 2016
HSRL-2 aerosol optical measurements and microphysical retrievals vs. airborne in situ measurements during DISCOVER-AQ 2013: an intercomparison study
Patricia Sawamura, Richard H. Moore, Sharon P. Burton, Eduard Chemyakin, Detlef Müller, Alexei Kolgotin, Richard A. Ferrare, Chris A. Hostetler, Luke D. Ziemba, Andreas J. Beyersdorf, and Bruce E. Anderson
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-380, https://doi.org/10.5194/acp-2016-380, 2016
Revised manuscript not accepted (discussion: closed, 8 comments)
22 Apr 2016
Pivotal role of the North African Dipole Intensity (NAFDI) on alternate Saharan dust export over the North Atlantic and the Mediterranean, and relationship with the Saharan Heat Low and mid-latitude Rossby waves
E. Cuevas, Á. J. Gómez-Peláez, S. Rodríguez, E. Terradellas, S. Basart, R. D. García, O. E. García, and S. Alonso-Pérez
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-287, https://doi.org/10.5194/acp-2016-287, 2016
Revised manuscript not accepted (discussion: closed, 8 comments)
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We revise the North African Dipole Intensity (NAFDI) index, and explain and quantify its relationship with the Saharan Heat Low (SHL) and mid-latitude Rossby waves. An analysis of aerosol optical depth anomalies over Northern Africa is performed for each phase of NAFDI/SHL. A comprehensive top-down conceptual model is introduced to explain the relationships between the NAFDI, the SHL and the mid-latitude Rossby waves and their impact in dust mobilization and transport in Northern Africa.
19 Apr 2016
Source Apportionment of Urban Particulate Matter using Hourly Resolved Trace Metals, Organics, and Inorganic Aerosol Components
Cheol-Heon Jeong, Jon M. Wang, and Greg J. Evans
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-189, https://doi.org/10.5194/acp-2016-189, 2016
Revised manuscript not accepted (discussion: closed, 4 comments)
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The source identification and quantification analysis of hourly resolved particulate matter chemical speciation data in downtown Toronto, Canada offered many advantages in terms of the identification of more sources and the resolution of more robust factor profiles and contributions. The results provide additional insight into sources of fine particle pollutants that have high temporal variations and thereby support the development of more effective control strategies for ambient pollutants.
18 Apr 2016
Complexities in the First Aerosol Indirect Effect over the Southern Great Plains
Sam Pennypacker and Allison L. Steiner
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-289, https://doi.org/10.5194/acp-2016-289, 2016
Revised manuscript has not been submitted (discussion: closed, 5 comments)
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We examine aerosol-cloud interactions detected in springtime cloud statistics over the Southern Great Plains of the United States in the context of cloud phase, measurement uncertainty and regional meteorology. Satellite retrievals of cloud properties are collocated with surface aerosol measurements over five years. The goal is to frame and motivate further work in what could cause deviations from the traditional theory of aerosol-cloud interactions over a given region.
13 Apr 2016
The mechanism of spray electrification: the waterfall effect
James K. Beattie
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2015-892, https://doi.org/10.5194/acp-2015-892, 2016
Revised manuscript not accepted (discussion: closed, 4 comments)
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It has been known since the 19th c that the air around the base of a waterfall is negatively charged. These "air-ions" are thought to have beneficial health effects. From the acid-base properties of the droplets it was inferred that the negative charge was due to adsorbed hydroxide ions but the origin of these was obscure. In other work we have shown that water behaves similarly at all interfaces with low dielectric materials, whether air, oil or inert solids like Teflon.
13 Apr 2016
Spatiotemporal variations in atmospheric aerosols in East Asia: Identifying local pollutants and transported Asian aerosols in Osaka, Japan using DRAGON
Makiko Nakata, Itaru Sano, Sonoyo Mukai, and Brent N. Holben
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-182, https://doi.org/10.5194/acp-2016-182, 2016
Revised manuscript not accepted (discussion: closed, 4 comments)
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We document the spatial and temporal variations of atmospheric aerosols in East Asia, specifically focusing on the NASA/AERONET-Osaka site in March 2012 during the AERONET “DRAGON-Japan” campaign. It has been shown that airborne pollutants can influence both the local atmosphere near to their source and relatively remote locations due to long-range transportation.
06 Apr 2016
Observational evidences of the influences of tropospheric subtropical and midlatitude stratospheric westerly jets on the equatorial stratospheric intraseasonal oscillations
G. Karthick Kumar Reddy, T. K. Ramkumar, and S. Venkatramana Reddy
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-118, https://doi.org/10.5194/acp-2016-118, 2016
Revised manuscript not accepted (discussion: closed, 4 comments)
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Long period oscillations (10–100 days) of the atmosphere found in all the heights of from the lower troposphere to the upper mesosphere (~ 1–100 km height) particularly in the tropical region have posed important questions like how they travel such large heights from below. The present work illustrates the importance of the combined influences of the subtropical tropospheric and mid-high latitude stratospheric jets in refracting back the tropospheric long-period oscillations to the tropical higher altitudes.
05 Apr 2016
Quantifying the global atmospheric power budget
Anastassia M. Makarieva, Victor G. Gorshkov, Andrei V. Nefiodov, Douglas Sheil, Antonio Donato Nobre, and Bai-Lian Li
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-203, https://doi.org/10.5194/acp-2016-203, 2016
Revised manuscript not accepted (discussion: closed, 11 comments)
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Why the Earth's atmospheric power – the rate at which solar energy is converted to wind – takes the value it does has long challenged theorists. We identify distinct terms in the atmospheric power budget and highlight their meaning and implications. We note problems with past estimates of this global power and generate our own for 2009–2015 using available gridded data. Spatial changes in atmospheric moisture, such as those caused by forest loss, will impact wind power, circulation and climate.
04 Apr 2016
Contributions of meteorology and emission to the 2015 winter severe haze pollution episodes in Northern China
Ting Ting Liu, Sunling Gong, Meng Yu, Qi Chao Zhao, Huai Rui Li, Jian Jun He, Jie Zhang, Lei Li, Xu Guan Wang, Shu Li Li, Yan Li Lu, Hai Tao Du, Ya Qiang Wang, Chun Hong Zhou, and Hong Li Liu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-204, https://doi.org/10.5194/acp-2016-204, 2016
Preprint withdrawn (discussion: closed, 4 comments)
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Network monitoring data of air pollutants and meteorology as well as an air quality modeling system in the Beijing–Tianjin–Hebei region were used to analyze impacts the changes of meteorology on the variation of air pollutants. Results show that the worsening meteorology conditions are the main reason behind this unusual increase of air pollutant concentrations in the winter of 2015 and the emission control measures taken during this period of time have contributed to mitigate the air pollution.
10 Mar 2016
Polycyclic aromatic hydrocarbons (PAHs) in aerosols over the central Himalayas along two south-north transects
Peng Fei Chen, Chao Liu Li, Shi Chang Kang, Maheswar Rupakheti, Arnico K. Panday, Fang Ping Yan, Quan Lian Li, Qiang Gong Zhang, Jun Ming Guo, Dipesh Rupakheti, and Wei Luo
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-71, https://doi.org/10.5194/acp-2016-71, 2016
Revised manuscript not accepted (discussion: closed, 6 comments)
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PAHs were measured at six sites along two south-north transects across the central Himalayas. The annual average PAHs and their dry deposition fluxes decreased noticeably from the south to north sides, however, a similar compostion pattern was found at three remote sites, suggesting the northern slope of the Himalayas may be affected by anthropogenic emissions form Indo-Gangetic Plain. PAHs showed a clear seasonal variation at Nepal and they were mainly form biomass and fossil combustion .
08 Mar 2016
Isotopic partitioning of nitrogen in PM2.5 at Beijing and a background site of China
Yan-Li Wang, Xue-Yan Liu, Wei Song, Wen Yang, Bin Han, Xiao-Yan Dou, Xu-Dong Zhao, Zhao-Liang Song, Cong-Qiang Liu, and Zhi-Peng Bai
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-187, https://doi.org/10.5194/acp-2016-187, 2016
Revised manuscript not accepted (discussion: closed, 6 comments)
01 Mar 2016
CO2 emissions inventory of Chinese cities
Yuli Shan, Dabo Guan, Jianghua Liu, Zhu Liu, Jingru Liu, Heike Schroeder, Yang Chen, Shuai Shao, Zhifu Mi, and Qiang Zhang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-176, https://doi.org/10.5194/acp-2016-176, 2016
Revised manuscript not accepted (discussion: closed, 4 comments)
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Cities contribute 85 % of the total CO2 emissions in China and thus are considered the key areas for implementing policies designed for climate change adaption and CO2 emission mitigation. This study presents a method for constructing a CO2 emissions inventory for Chinese cities in terms of the definition provided by the IPCC territorial emission accounting approach. We apply this method to compile CO2 emissions inventories for 20 Chinese cities and analyse their emission characteristic.
01 Mar 2016
Chamber simulation on the formation of secondary organic aerosols (SOA) from diesel vehicle exhaust in China
Wei Deng, Qihou Hu, Tengyu Liu, Xinming Wang, Yanli Zhang, Xiang Ding, Yele Sun, Xinhui Bi, Jianzhen Yu, Weiqiang Yang, Xinyu Huang, Zhou Zhang, Zhonghui Huang, Quanfu He, A. Mellouki, and Christian George
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-50, https://doi.org/10.5194/acp-2016-50, 2016
Revised manuscript not accepted (discussion: closed, 7 comments)
01 Feb 2016
Similarity analysis of turbulent transport and dissipation for momentum, temperature, moisture, and CO2 during BLLAST
João A. Hackerott, Mostafa Bakhday Paskyabi, Stephan T. Kral, Joachim Reuder, Amauri P. de Oliveira, Edson P. Marques Filho, Michel d. S. Mesquita, and Ricardo de Camargo
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2015-1061, https://doi.org/10.5194/acp-2015-1061, 2016
Preprint withdrawn (discussion: closed, 5 comments)
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The turbulent variance equation components for wind, temperature, humidity, and CO2 were estimated applying the Inertial Dissipation and Eddy Covariance methods on BLLAST dataset. The tracers show similar behavior only for convective regime, linearly related to the buoyancy for dissipation. For stable and near-neutral, the transport term for tracers are not similar and for TKE shall not be neglected. On stable regimes, other mechanisms in addition to stability may be significantly important.
26 Jan 2016
The impact of the diurnal cycle of the atmospheric boundary layer on physical variables relevant for wind energy applications
Antonia Englberger and Andreas Dörnbrack
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2015-995, https://doi.org/10.5194/acp-2015-995, 2016
Revised manuscript not accepted (discussion: closed, 4 comments)
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A numerical simulation of the diurnal cycle is performed with an evaluation focusing on the operating height of a wind turbine (lowest 200 m). The prevailing wind and the atmospheric turbulence depend on the time of the day, with a larger vertical gradient of the wind at night and an increase in atmospheric turbulence during day. Further, the amount of shear correlates with the heterogeneity of the surface. These dependencies affect the wake structure and the loading a wind turbine experiences.
19 Jan 2016
Intercomparison of four different cascade impactors for fine and ultrafine particle sampling in two European locations
A. S. Fonseca, N. Talbot, J. Schwarz, J. Ondráček, V. Ždímal, J. Kozáková, M. Viana, A. Karanasiou, X. Querol, A. Alastuey, T. V. Vu, J. M. Delgado-Saborit, and R. M. Harrison
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2015-1016, https://doi.org/10.5194/acp-2015-1016, 2016
Revised manuscript not accepted (discussion: closed, 6 comments)
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This work assessed the performance of 4 cascade impactors, by means of two intercomparison exercises in 2 European locations. The comparability between the different types of impactors assessed was dependent on particle size and on impactor design characteristics. Particle processes such as particle bounce, dissociation of semi volatiles in the coarser stages and/or particle shrinkage were identified as the main causes for the differences observed in particle mass across size fractions.
19 Jan 2016
A novel technique including GPS radio occultation for detecting and monitoring volcanic clouds
Riccardo Biondi, Andrea Steiner, Gottfried Kirchengast, Hugues Brenot, and Therese Rieckh
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2015-974, https://doi.org/10.5194/acp-2015-974, 2016
Revised manuscript not accepted (discussion: closed, 8 comments)
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Cloud structure and cloud top height are key parameters for the monitoring of volcanic cloud movement and for characterizing eruptive processes and understanding the impact on short-term climate variability.
We have studied the eruption of Nabro volcano, which has been recognized as the largest stratospheric sulfur injection since Pinatubo (1991) and we have found a clear warming signature after the eruption of Nabro persisting for a few months.
18 Jan 2016
Stratosphere-troposphere exchange in the vicinity of a tropopause fold
Christiane Hofmann, Astrid Kerkweg, Peter Hoor, and Patrick Jöckel
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2015-949, https://doi.org/10.5194/acp-2015-949, 2016
Revised manuscript not accepted (discussion: closed, 3 comments)
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Ozone enhancements at the surface, caused by descending stratospheric air masses along deep tropopause folds, can be reproduced using the model system MECO(n). It is shown that stratosphere-troposphere-exchange (STE) in the vicinity of a tropopause fold occurs in regions of turbulence and diabatic processes. The efficiency of mixing is quantified, showing that almost all of the air masses originating in the tropopause fold are transported into the troposphere during the following two days.
27 Nov 2015
Observationally-constrained carbonaceous aerosol source estimates for the Pearl River Delta area of China
N. Li, T.-M. Fu, J. J. Cao, J. Y. Zheng, Q. Y. He, X. Long, Z. Z. Zhao, N. Y. Cao, J. S. Fu, and Y. F. Lam
Atmos. Chem. Phys. Discuss., 15, 33583–33629, https://doi.org/10.5194/acpd-15-33583-2015, https://doi.org/10.5194/acpd-15-33583-2015, 2015
Revised manuscript not accepted (discussion: closed, 3 comments)
25 Nov 2015
Modelled thermal and dynamical responses of the middle atmosphere to EPP-induced ozone changes
K. Karami, P. Braesicke, M. Kunze, U. Langematz, M. Sinnhuber, and S. Versick
Atmos. Chem. Phys. Discuss., 15, 33283–33329, https://doi.org/10.5194/acpd-15-33283-2015, https://doi.org/10.5194/acpd-15-33283-2015, 2015
Revised manuscript has not been submitted (discussion: closed, 4 comments)
24 Nov 2015
North Atlantic Oscillation model projections and influence on tracer transport
S. Bacer, T. Christoudias, and A. Pozzer
Atmos. Chem. Phys. Discuss., 15, 33049–33075, https://doi.org/10.5194/acpd-15-33049-2015, https://doi.org/10.5194/acpd-15-33049-2015, 2015
Preprint withdrawn (discussion: closed, 4 comments)
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We investigate the temporal variability of the North Atlantic Oscillation (NAO) pattern and its relation to the atmospheric dispersion of pollutants in the near past and in the future.
We use a global climate circulation model in order to analyze the NAO signal and its correlation with pollutant concentrations. We find that the NAO is influenced by natural climate variability and that the NAO Indices may be used as indicators of (future) pollutant transport over Europe.
08 Oct 2015
Baseline carbon monoxide and ozone in the northeast US over 2001–2010
Y. Zhou, H. Mao, K. Demerjian, C. Hogrefe, and J. Liu
Atmos. Chem. Phys. Discuss., 15, 27253–27309, https://doi.org/10.5194/acpd-15-27253-2015, https://doi.org/10.5194/acpd-15-27253-2015, 2015
Revised manuscript not accepted (discussion: closed, 4 comments)
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Baseline carbon monoxide (CO) and ozone (O3) were studied at seven rural sites in the Northeast U.S. during varying periods over 2001 – 2010. Baseline CO at all sites decreased significantly at a rate between -4.3 – -2.3 ppbv yr-1, while baseline O3 was relatively constant. Interannual and seasonal variations of baseline CO and O3 were related to increasing Asian emissions, NOx emissions reduction in urban areas, global biomass burning emissions, and meteorological conditions.
24 Sep 2015
Simultaneous Retrievals of Polar Mesospheric Clouds (PMCs) with Ozone from OMI UV measurements
J. Bak, X. Liu, J. H. Kim, M. T. Deland, and K. Chance
Atmos. Chem. Phys. Discuss., 15, 25907–25932, https://doi.org/10.5194/acpd-15-25907-2015, https://doi.org/10.5194/acpd-15-25907-2015, 2015
Revised manuscript not accepted (discussion: closed, 4 comments)
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This work demonstrated the interference of tenuous PMCs on OMI ozone profile retrievals above 6hPa. The presence of PMCs leads to the systematic biases of -2% at 2hPa and -20% at 0.5hPa in OMI retrievals, which are significantly correlated with brightness of PMCs. We perform simultaneous retrievals of PMC optical depth with ozone using optimal estimation technique, to reduce the interference on ozone profile retrievals. As a result, the negative OMI biases are reduced to within ±10%.
16 Sep 2015
Towards a first classification of aerosol shrinkage events
E. Alonso-Blanco, F. J. Gómez-Moreno, L. Núñez, M. Pujadas, M. Cusack, and B. Artíñano
Atmos. Chem. Phys. Discuss., 15, 25231–25267, https://doi.org/10.5194/acpd-15-25231-2015, https://doi.org/10.5194/acpd-15-25231-2015, 2015
Revised manuscript not accepted (discussion: closed, 6 comments)
08 Sep 2015
The latitudinal structure of recent changes in the boreal Brewer–Dobson circulation
C. Shi, D. Guo, J. Xu, A. M. Powell Jr., and T. Xu
Atmos. Chem. Phys. Discuss., 15, 24403–24417, https://doi.org/10.5194/acpd-15-24403-2015, https://doi.org/10.5194/acpd-15-24403-2015, 2015
Revised manuscript not accepted (discussion: closed, 3 comments)
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The latitudinal structure of recent changes in the boreal Brewer-Dobson Circulation presented the reduction of the tropical upwelling and the local strengthening of the mid-latitude downwelling. The acceleration of downwelling in the mid-latitudes is caused by the branch narrowing equatorward which is related to the weaker planetary wave activity and the stronger polar vortex.
07 Sep 2015
Isoprene chemistry in pristine and polluted Amazon environments: Eulerian and Lagrangian model frameworks and the strong bearing they have on our understanding of surface ozone and predictions of rainforest exposure to this priority pollutant
J. G. Levine, A. R. MacKenzie, O. J. Squire, A. T. Archibald, P. T. Griffiths, N. L. Abraham, J. A. Pyle, D. E. Oram, G. Forster, J. F. Brito, J. D. Lee, J. R. Hopkins, A. C. Lewis, S. J. B. Bauguitte, C. F. Demarco, P. Artaxo, P. Messina, J. Lathière, D. A. Hauglustaine, E. House, C. N. Hewitt, and E. Nemitz
Atmos. Chem. Phys. Discuss., 15, 24251–24310, https://doi.org/10.5194/acpd-15-24251-2015, https://doi.org/10.5194/acpd-15-24251-2015, 2015
Revised manuscript has not been submitted (discussion: closed, 2 comments)
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This study explores our ability to simulate atmospheric chemistry stemming from isoprene emissions—a reactive gas emitted from vegetation—in pristine and polluted regions of the Amazon basin. We explore how two contrasting models fare in reproducing recent airborne measurements in the region. Their differing treatments of transport and mixing are found to: profoundly affect their performance; and yield very different pictures of the exposure of the rainforest to harmful ozone concentrations.
04 Sep 2015
Equatorial middle atmospheric chemical composition changes during sudden stratospheric warming events
O. Nath and S. Sridharan
Atmos. Chem. Phys. Discuss., 15, 23969–23988, https://doi.org/10.5194/acpd-15-23969-2015, https://doi.org/10.5194/acpd-15-23969-2015, 2015
Revised manuscript not accepted (discussion: closed, 4 comments)
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Chemical composition changes over equator during SSW events are investigated using MLS and MIPAS data sets. It is found that the O3 VMR increases whereas H2O VMR decreases. In the upper stratosphere, the source of water vapor is oxidation of CH4 by OH or O. But, OH does not vary during SSW. The temperature decrease over equator during SSW increases the reaction rate of ozone production to shift the O/O3 ratio towards O3, resulting in decrease of CH4 oxidation and consequent decrease in H2O.
26 Aug 2015
Spatial, temporal and vertical distribution of ammonia concentrations over Europe – comparing a static and dynamic approach with WRF-Chem
M. Werner, M. Kryza, C. Geels, T. Ellermann, and C. Ambelas Skjøth
Atmos. Chem. Phys. Discuss., 15, 22935–22973, https://doi.org/10.5194/acpd-15-22935-2015, https://doi.org/10.5194/acpd-15-22935-2015, 2015
Revised manuscript not accepted (discussion: closed, 9 comments)
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In our study we aim at improving the basic understanding of ammonia in the atmosphere. We have also identified current limitations in relation to the governing processes that cause ammonia emissions and initial dispersion due to meteorological parameters. For this purpose we have implemented the emission from a dynamical ammonia model into the atmospheric transport model WRF-Chem and evaluated the model results against a static approach for describing the emissions and against measurements.
26 Aug 2015
Investigation of error sources in regional inverse estimates of greenhouse gas emissions in Canada
E. Chan, D. Chan, M. Ishizawa, F. Vogel, J. Brioude, A. Delcloo, Y. Wu, and B. Jin
Atmos. Chem. Phys. Discuss., 15, 22715–22779, https://doi.org/10.5194/acpd-15-22715-2015, https://doi.org/10.5194/acpd-15-22715-2015, 2015
Revised manuscript not accepted (discussion: closed, 4 comments)
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This paper uses synthetic data experiments to investigate the impacts of different error sources associated with prior flux, transport model and optimisation method on the atmospheric greenhouse gas inverse estimates. Results indicate that estimation errors are dominated by the transport model error and can propagate to the flux estimates non-linearly. It is necessary to obtain stable and realistic results in synthetic data experiments before a real observation-based inversion is performed.
25 Aug 2015
Observation of a tidal effect on the Polar Jet Stream
C. H. Best and R. Madrigali
Atmos. Chem. Phys. Discuss., 15, 22701–22713, https://doi.org/10.5194/acpd-15-22701-2015, https://doi.org/10.5194/acpd-15-22701-2015, 2015
Revised manuscript not accepted (discussion: closed, 17 comments)
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This paper demonstrates for the first time a direct link between atmospheric tides and the Polar Jet Stream flow. The authors have identified an anti-correlation of the Arctic Oscillation with the horizontal (‘tractional’) tidal force acting at high latitudes, particularly during winter months. The tractional force varies strongly during the lunar month and with the 18.6 year precession cycle of the lunar orbit. Changes in Jet Stream flow have a large effect on winter weather.
28 Jul 2015
The imprint of stratospheric transport on column-averaged methane
A. Ostler, R. Sussmann, P. K. Patra, P. O. Wennberg, N. M. Deutscher, D. W. T. Griffith, T. Blumenstock, F. Hase, R. Kivi, T. Warneke, Z. Wang, M. De Mazière, J. Robinson, and H. Ohyama
Atmos. Chem. Phys. Discuss., 15, 20395–20447, https://doi.org/10.5194/acpd-15-20395-2015, https://doi.org/10.5194/acpd-15-20395-2015, 2015
Preprint withdrawn (discussion: closed, 3 comments)
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We find that stratospheric model-transport errors are common for chemical transport models that are used for inverse estimates of CH4 emissions. These model-transport errors cause latitudinal as well as seasonal biases in simulated stratospheric and, hence, column-averaged CH4 mixing ratios (XCH4). Such a model bias corresponds to an overestimation of arctic and mid-latitude CH4 emissions if inversion studies do not apply an ad hoc bias correction before inverting fluxes from XCH4 observations.
22 Jul 2015
Development of an atmospheric N2O isotopocule model and optimization procedure, and application to source estimation
K. Ishijima, M. Takigawa, K. Sudo, S. Toyoda, N. Yoshida, T. Röckmann, J. Kaiser, S. Aoki, S. Morimoto, S. Sugawara, and T. Nakazawa
Atmos. Chem. Phys. Discuss., 15, 19947–20011, https://doi.org/10.5194/acpd-15-19947-2015, https://doi.org/10.5194/acpd-15-19947-2015, 2015
Revised manuscript not accepted (discussion: closed, 4 comments)
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We developed an atmospheric N2O isotopocule model based on a chemistry-coupled atmospheric general circulation model and a simple method to optimize the model, and estimated the isotopic signatures of surface sources at the hemispheric scale. Data obtained from ground-based observations, measurements of firn air, and balloon and aircraft flights were used to optimize the long-term trends, interhemispheric gradients, and photolytic fractionation, respectively, in the model.
08 Jul 2015
New characteristics of submicron aerosols and factor analysis of combined organic and inorganic aerosol mass spectra during winter in Beijing
J. K. Zhang, D. S. Ji, Z. R. Liu, B. Hu, L. L. Wang, X. J. Huang, and Y. S. Wang
Atmos. Chem. Phys. Discuss., 15, 18537–18576, https://doi.org/10.5194/acpd-15-18537-2015, https://doi.org/10.5194/acpd-15-18537-2015, 2015
Revised manuscript has not been submitted (discussion: closed, 4 comments)
30 Jun 2015
Effect of retreating sea ice on Arctic cloud cover in simulated recent global warming
M. Abe, T. Nozawa, T. Ogura, and K. Takata
Atmos. Chem. Phys. Discuss., 15, 17527–17552, https://doi.org/10.5194/acpd-15-17527-2015, https://doi.org/10.5194/acpd-15-17527-2015, 2015
Revised manuscript not accepted (discussion: closed, 4 comments)
23 Jun 2015
Source analysis of peroxyacetyl nitrate (PAN) in Guangzhou, China: a yearlong observation study
B. G. Wang, D. Zhu, Y. Zou, H. Wang, L. Zhou, X. Ouyang, H. F. Shao, and X. J. Deng
Atmos. Chem. Phys. Discuss., 15, 17093–17133, https://doi.org/10.5194/acpd-15-17093-2015, https://doi.org/10.5194/acpd-15-17093-2015, 2015
Revised manuscript has not been submitted (discussion: closed, 6 comments)
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Photochemical smog has been a major cause of air pollution in Guangzhou, one of megacities in China. This study firstly examined the source of peroxyacetyl nitrate in Guangzhou based on a yearlong data set including PAN, ozone, nitrogen oxides and non-methane hydrocarbons. The results suggest regional air mass transport of pollutants had a major impact on the PAN concentrations in Guangzhou area, which will provide useful information for more effectively managing the air quality of Guangzhou.
12 Jun 2015
Tropical, oceanic, deep convective cloud morphology as observed by CloudSat
M. R. Igel and S. C. van den Heever
Atmos. Chem. Phys. Discuss., 15, 15977–16017, https://doi.org/10.5194/acpd-15-15977-2015, https://doi.org/10.5194/acpd-15-15977-2015, 2015
Revised manuscript not accepted (discussion: closed, 4 comments)
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Presented in this paper are further results from a recently developed CloudSat tropical deep convective cloud database first detailed in Igel et al (2014). Length scales of the "average" mature tropical deep convective cloud are discussed. These scales are then used to provide insight into the relationship between the upper and lower regions of the cloud. The width of cloud anvil is shown to grow proportionally slower than the width of the rest of the cloud.
02 Jun 2015
Tropical response to extratropical eastward propagating waves
S. Sridharan and M. Sandhya
Atmos. Chem. Phys. Discuss., 15, 15137–15153, https://doi.org/10.5194/acpd-15-15137-2015, https://doi.org/10.5194/acpd-15-15137-2015, 2015
Revised manuscript not accepted (discussion: closed, 4 comments)
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Eastward propagating 18-day waves of zonal wavenumbers (k=1-5) are observed in mid-latitude meridional winds at 200 hPa during December 2012-February 2013. Among these, the 18-day wave of k=5 propagates equatorward. Presence of wave of similar periodicity (18-day) and zonal structure (k=5) in tropical OLR as that of extratropical wave disturbance is first reported. We suggest that the selective response of the tropical wave forcing is due to the lateral forcing of the extra-tropical wave.
08 May 2015
Modeling organic aerosol composition at the puy de Dôme mountain (France) for two contrasted air masses with the WRF-Chem model
C. Barbet, L. Deguillaume, N. Chaumerliac, M. Leriche, A. Berger, E. Freney, A. Colomb, K. Sellegri, L. Patryl, and P. Armand
Atmos. Chem. Phys. Discuss., 15, 13395–13455, https://doi.org/10.5194/acpd-15-13395-2015, https://doi.org/10.5194/acpd-15-13395-2015, 2015
Preprint withdrawn (discussion: closed, 2 comments)
22 Apr 2015
Use of criteria pollutants, active and passive mercury sampling, and receptor modeling to understand the chemical forms of gaseous oxidized mercury in Florida
J. Huang, M. B. Miller, E. Edgerton, and M. S. Gustin
Atmos. Chem. Phys. Discuss., 15, 12069–12105, https://doi.org/10.5194/acpd-15-12069-2015, https://doi.org/10.5194/acpd-15-12069-2015, 2015
Revised manuscript not accepted (discussion: closed, 3 comments)
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Gaseous oxidized Hg (GOM) is a major contributor to Hg in wet and dry deposition. Recent work has indicated that the concentrations of GOM as measured are too low by 3-to-12 times; and that compounds vary across space and time. Data collected in Florida indicate five potential GOM compounds, including HgBr2, HgO, Hg(NO3)2, HgSO4, and an unknown compound. Sources include local combustion (cars and power plants), the marine boundary layer, and long range transport from Asia.
15 Apr 2015
Heavy air pollution episodes in Beijing during January 2013: inorganic ion chemistry and source analysis using Highly Time-Resolved Measurements in an urban site
B. Han, R. Zhang, W. Yang, Z. Bai, Z. Ma, and W. Zhang
Atmos. Chem. Phys. Discuss., 15, 11111–11141, https://doi.org/10.5194/acpd-15-11111-2015, https://doi.org/10.5194/acpd-15-11111-2015, 2015
Revised manuscript has not been submitted (discussion: closed, 3 comments)
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This paper focused on the air pollution episodes occurred in Beijing, China, during January of 2013. Highly time-resolved measurements of water soluble ions associated with PM2.5 were conducted at an urban site. The paper analyzed the potential roles of water-soluble ions in the formation of air pollution episodes, and found sulfate might be one of the key factors in episodes by analyzing ions compositions in different PM2.5 concentrations.
31 Mar 2015
Development and optimization of a wildfire plume rise model based on remote sensing data inputs – Part 2
R. Paugam, M. Wooster, J. Atherton, S. R. Freitas, M. G. Schultz, and J. W. Kaiser
Atmos. Chem. Phys. Discuss., 15, 9815–9895, https://doi.org/10.5194/acpd-15-9815-2015, https://doi.org/10.5194/acpd-15-9815-2015, 2015
Revised manuscript not accepted (discussion: closed, 4 comments)
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The transport of Biomass Burning emissions in Chemical Transport Model rely on parametrization of plumes injection height. Using fire observation selected to ensure match-up of fire-atmosphere-plume dynamics; a popular plume rise model was improved and optimized. The resulting model shows response to the effect of atmospheric stability consistent with previous findings and is able to predict higher injection height than any other tested parametrizations, giving a closer match with observation.
31 Mar 2015
Aerosol vertical distribution, optical properties and transport over Corsica (western Mediterranean)
J.-F. Léon, P. Augustin, M. Mallet, T. Bourrianne, V. Pont, F. Dulac, M. Fourmentin, D. Lambert, and B. Sauvage
Atmos. Chem. Phys. Discuss., 15, 9507–9540, https://doi.org/10.5194/acpd-15-9507-2015, https://doi.org/10.5194/acpd-15-9507-2015, 2015
Preprint withdrawn (discussion: closed, 6 comments)
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This paper presents the aerosol vertical distribution observed by lidar soundings in Corsica (western Mediterranean) between February 2012 and August 2013. A seasonal cycle is observed in the extinction coefficient profiles and aerosol optical thickness with minima in winter and maxima in spring-summer. Less than 10% of the daily observations show high AOD corresponding to the large-scale advection of desert dust from Northern Africa or pollution aerosols from Europe.
06 Mar 2015
Simulating CO2 profiles using NIES TM and comparison with HIAPER Pole-to-Pole Observations
C. Song, S. Maksyutov, D. Belikov, H. Takagi, and J. Shu
Atmos. Chem. Phys. Discuss., 15, 6745–6770, https://doi.org/10.5194/acpd-15-6745-2015, https://doi.org/10.5194/acpd-15-6745-2015, 2015
Preprint withdrawn (discussion: closed, 8 comments)
19 Feb 2015
In-situ single submicron particle composition analysis of ice residuals from mountain-top mixed-phase clouds in Central Europe
S. Schmidt, J. Schneider, T. Klimach, S. Mertes, L. P. Schenk, J. Curtius, P. Kupiszewski, E. Hammer, P. Vochezer, G. Lloyd, M. Ebert, K. Kandler, S. Weinbruch, and S. Borrmann
Atmos. Chem. Phys. Discuss., 15, 4677–4724, https://doi.org/10.5194/acpd-15-4677-2015, https://doi.org/10.5194/acpd-15-4677-2015, 2015
Revised manuscript not accepted (discussion: closed, 6 comments)
22 Jan 2015
Separating refractory and non-refractory particulate chloride and estimating chloride depletion by aerosol mass spectrometry in a marine environment
I. Nuaaman, S.-M. Li, K. L. Hayden, T. B. Onasch, P. Massoli, D. Sueper, D. R. Worsnop, T. S. Bates, P. K. Quinn, and R. McLaren
Atmos. Chem. Phys. Discuss., 15, 2085–2118, https://doi.org/10.5194/acpd-15-2085-2015, https://doi.org/10.5194/acpd-15-2085-2015, 2015
Revised manuscript has not been submitted (discussion: closed, 2 comments)
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In this paper, we focus on the measurement and reporting of mass concentrations of particulate chloride and sea salt in a marine area off the coast of California using a High Resolution Aerosol Mass Spectrometer. We outline a method of deconvolving the total aerosol chloride mass into refractory and non-refractory components, previously not reported in the literature. This can be important in regions where refractory sea salt aerosols can contribute to the aerosol chloride signal measured with t
22 Jan 2015
Understanding atmospheric peroxyformic acid chemistry: observation, modeling and implication
H. Liang, Z. M. Chen, D. Huang, Q. Q. Wu, and L. B. Huang
Atmos. Chem. Phys. Discuss., 15, 2055–2084, https://doi.org/10.5194/acpd-15-2055-2015, https://doi.org/10.5194/acpd-15-2055-2015, 2015
Revised manuscript not accepted (discussion: closed, 6 comments)
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The present field measurements have provided strong evidence for the existence of peroxyformic acid (HC(O)OOH) in the atmosphere for the first time. Moreover, the potential impact of peroxyformic acid chemistry on the formic acid production and the radical budget has been evaluated on the basis of model calculations. Our findings are of importance for a full understanding of the cycling of oxidants and the source of organic acids in the atmosphere.
19 Jan 2015
The climatology of dust aerosol over the arabian peninsula
A. Shalaby, B. Rappenglueck, and E. A. B. Eltahir
Atmos. Chem. Phys. Discuss., 15, 1523–1571, https://doi.org/10.5194/acpd-15-1523-2015, https://doi.org/10.5194/acpd-15-1523-2015, 2015
Revised manuscript not accepted (discussion: closed, 8 comments)
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Dust storms are considered to be a natural hazard over the Arabian Peninsula, since they occur all year round with maximum intensity and frequency in Spring and Summer. AERONET, MODIS, MISR, OMI datasets have been analyzed to study atmospheric dust over Arabia also a 13 years simulation has been performed to study the dust climatology. The study showed how dust aerosol climatology changes from northern Arabia to southern Arabia and how this may impact the region climatology.
14 Jan 2015
Lidar observations of Nabro volcano aerosol layers in the stratosphere over Gwangju, Korea
D. Shin, D. Müller, K. Lee, S. Shin, Y. J. Kim, C. K. Song, and Y. M. Noh
Atmos. Chem. Phys. Discuss., 15, 1171–1191, https://doi.org/10.5194/acpd-15-1171-2015, https://doi.org/10.5194/acpd-15-1171-2015, 2015
Preprint withdrawn (discussion: closed, 6 comments)
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We present for the first time results of Raman lidar observations of the temporal evolution of a stratospheric aerosol layer observed in the upper troposphere and lower stratosphere over Korea. We find what non-spherical particles may have been present in the lower stratosphere for at least six months after the eruption on the volcano. Our study adds to the limited information on volcanic aerosols over East Asia.
07 Jan 2015
High spatial resolution aerosol retrievals used for daily particulate matter monitoring over Po valley, northern Italy
B. Arvani, R. B. Pierce, A. I. Lyapustin, Y. Wang, G. Ghermandi, and S. Teggi
Atmos. Chem. Phys. Discuss., 15, 123–155, https://doi.org/10.5194/acpd-15-123-2015, https://doi.org/10.5194/acpd-15-123-2015, 2015
Revised manuscript not accepted (discussion: closed, 4 comments)
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The manuscript compares 10km Moderate Resolution Imaging Spectroradiometer (MODIS) Collection 5.1 and new 1 km Multi-Angle Implementation of Atmospheric Correction (MAIAC) Aerosol Optical Depth (AOD) retrievals to small (<10 micron) particulate matter (PM10) surface measurements from monitoring stations within the Po Valley in Northern Italy during 2012. When the depth of the planetary boundary layer (PBL) is used to normalize the AOD, we find PM – AOD correlations of 0.98 for both retrievals.
22 Dec 2014
The diurnal variation in stratospheric ozone from the MACC reanalysis, the ERA-Interim reanalysis, WACCM and Earth observation data: characteristics and intercomparison
A. Schanz, K. Hocke, N. Kämpfer, S. Chabrillat, A. Inness, M. Palm, J. Notholt, I. Boyd, A. Parrish, and Y. Kasai
Atmos. Chem. Phys. Discuss., 14, 32667–32708, https://doi.org/10.5194/acpd-14-32667-2014, https://doi.org/10.5194/acpd-14-32667-2014, 2014
Revised manuscript not accepted (discussion: closed, 3 comments)
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The manuscript describes novel findings in the diurnal variation of stratospheric ozone by means of the MACC reanalysis, the ERA-Interim reanalysis and the WACCM model. The diurnal variation in ozone has dynamical and photochemical origins which lead to substantial amplitudes especially in the polar, stratospheric regions. The unprecedented, global view on diurnal ozone variation strengthens the implication to correct diurnally sampled satellite observations used for ozone trend estimates.
19 Dec 2014
Volatile organic compounds over Eastern Himalaya, India: temporal variation and source characterization using Positive Matrix Factorization
C. Sarkar, A. Chatterjee, D. Majumdar, S. K. Ghosh, A. Srivastava, and S. Raha
Atmos. Chem. Phys. Discuss., 14, 32133–32175, https://doi.org/10.5194/acpd-14-32133-2014, https://doi.org/10.5194/acpd-14-32133-2014, 2014
Revised manuscript not accepted (discussion: closed, 8 comments)
15 Dec 2014
Estimating CO2 emissions from point sources: a case study of an isolated power station
S. R. Utembe, N. Jones, P. J. Rayner, I. Genkova, D. W. T. Griffith, D. M. O'Brien, C. Lunney, and A. J. Clark
Atmos. Chem. Phys. Discuss., 14, 31551–31601, https://doi.org/10.5194/acpd-14-31551-2014, https://doi.org/10.5194/acpd-14-31551-2014, 2014
Revised manuscript not accepted (discussion: closed, 3 comments)
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A methodology to estimate CO2 emissions from an isolated power plant
is presented and illustrated for a power station in South Australia. It involves measurement of in-situ and column-averaged CO2 near the power plant, forward modelling of the observed signals (using WRF-Chem) and inverse modelling to obtain an estimate of the power plant fluxes. Better simulation is obtained for column data giving better estimates of fluxes. Our estimated emissions are within 6% of the reported values.
21 Nov 2014
High-resolution atmospheric water vapor measurements with a scanning differential absorption lidar
F. Späth, A. Behrendt, S. K. Muppa, S. Metzendorf, A. Riede, and V. Wulfmeyer
Atmos. Chem. Phys. Discuss., 14, 29057–29099, https://doi.org/10.5194/acpd-14-29057-2014, https://doi.org/10.5194/acpd-14-29057-2014, 2014
Revised manuscript has not been submitted (discussion: closed, 5 comments)
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The scanning differential absorption lidar (DIAL) of the University of Hohenheim is presented.
We show the design of the instrument and illustrate its performance with recent water vapor measurements taken in Stuttgart-Hohenheim and in the frame of HOPE. Scanning measurements reveal the 3-dimensional structures of the water vapor field.
The influence of uncertainties within the calculation of the absorption cross-section at wavelengths around 818 nm for the WV retrieval is discussed.
06 Nov 2014
Long term measurements of optical properties and their hygroscopic enhancement
M. Hervo, K. Sellegri, J. M. Pichon, J. C. Roger, and P. Laj
Atmos. Chem. Phys. Discuss., 14, 27731–27767, https://doi.org/10.5194/acpd-14-27731-2014, https://doi.org/10.5194/acpd-14-27731-2014, 2014
Revised manuscript not accepted (discussion: closed, 6 comments)
20 Oct 2014
Attribution of future US ozone pollution to regional emissions, climate change, long-range transport, and model deficiency
H. He, X.-Z. Liang, H. Lei, and D. J. Wuebbles
Atmos. Chem. Phys. Discuss., 14, 26231–26256, https://doi.org/10.5194/acpd-14-26231-2014, https://doi.org/10.5194/acpd-14-26231-2014, 2014
Revised manuscript not accepted (discussion: closed, 6 comments)
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This study used a regional air quality model coupled with a regional climate model to investigate the future U.S. ozone pollution. We identified the individual contribution from emissions change, climate change, long range transport and model deficiency, and estimated the uncertainty.
15 Oct 2014
Study of satellite retrieved aerosol optical depth spatial resolution effect on particulate matter concentration prediction
J. Strandgren, L. Mei, M. Vountas, J. P. Burrows, A. Lyapustin, and Y. Wang
Atmos. Chem. Phys. Discuss., 14, 25869–25899, https://doi.org/10.5194/acpd-14-25869-2014, https://doi.org/10.5194/acpd-14-25869-2014, 2014
Revised manuscript not accepted (discussion: closed, 4 comments)
18 Sep 2014
Sensitivity study of the aerosol effects on a supercell storm throughout its lifetime
A. Takeishi and T. Storelvmo
Atmos. Chem. Phys. Discuss., 14, 24087–24118, https://doi.org/10.5194/acpd-14-24087-2014, https://doi.org/10.5194/acpd-14-24087-2014, 2014
Revised manuscript not accepted (discussion: closed, 5 comments)
17 Sep 2014
Evaluation of MEGAN-CLM parameter sensitivity to predictions of isoprene emissions from an Amazonian rainforest
J. A. Holm, K. Jardine, A. B. Guenther, J. Q. Chambers, and E. Tribuzy
Atmos. Chem. Phys. Discuss., 14, 23995–24041, https://doi.org/10.5194/acpd-14-23995-2014, https://doi.org/10.5194/acpd-14-23995-2014, 2014
Revised manuscript not accepted (discussion: closed, 6 comments)
16 Sep 2014
The stratospheric response to external factors based on MERRA data using linear multivariate linear regression analysis
M. Kozubek, E. Rozanov, and P. Krizan
Atmos. Chem. Phys. Discuss., 14, 23891–23911, https://doi.org/10.5194/acpd-14-23891-2014, https://doi.org/10.5194/acpd-14-23891-2014, 2014
Revised manuscript not accepted (discussion: closed, 6 comments)
10 Sep 2014
Meridional distribution of aerosol optical thickness over the tropical Atlantic Ocean
P. Kishcha, A. M. da Silva, B. Starobinets, C. N. Long, O. Kalashnikova, and P. Alpert
Atmos. Chem. Phys. Discuss., 14, 23309–23339, https://doi.org/10.5194/acpd-14-23309-2014, https://doi.org/10.5194/acpd-14-23309-2014, 2014
Revised manuscript not accepted (discussion: closed, 6 comments)
08 Sep 2014
Analysis of the atmospheric composition during the summer 2013 over the Mediterranean area using the CHARMEX measurements and the CHIMERE model
L. Menut, S. Mailler, G. Siour, B. Bessagnet, S. Turquety, G. Rea, R. Briant, M. Mallet, J. Sciare, and P. Formenti
Atmos. Chem. Phys. Discuss., 14, 23075–23123, https://doi.org/10.5194/acpd-14-23075-2014, https://doi.org/10.5194/acpd-14-23075-2014, 2014
Revised manuscript not accepted (discussion: closed, 3 comments)
03 Sep 2014
Constraining terrestrial ecosystem CO2 fluxes by integrating models of biogeochemistry and atmospheric transport and data of surface carbon fluxes and atmospheric CO2 concentrations
Q. Zhu, Q. Zhuang, D. Henze, K. Bowman, M. Chen, Y. Liu, Y. He, H. Matsueda, T. Machida, Y. Sawa, and W. Oechel
Atmos. Chem. Phys. Discuss., 14, 22587–22638, https://doi.org/10.5194/acpd-14-22587-2014, https://doi.org/10.5194/acpd-14-22587-2014, 2014
Revised manuscript not accepted (discussion: closed, 4 comments)
27 Aug 2014
Aerosol–cloud interactions studied with the chemistry-climate model EMAC
D. Y. Chang, H. Tost, B. Steil, and J. Lelieveld
Atmos. Chem. Phys. Discuss., 14, 21975–22043, https://doi.org/10.5194/acpd-14-21975-2014, https://doi.org/10.5194/acpd-14-21975-2014, 2014
Preprint withdrawn (discussion: closed, 6 comments)
21 Aug 2014
Sources, solubility, and acid processing of aerosol iron and phosphorous over the South China Sea: East Asian dust and pollution outflows vs. Southeast Asian biomass burning
S.-C. Hsu, G.-C. Gong, F.-K. Shiah, C.-C. Hung, S.-J. Kao, R. Zhang, W.-N. Chen, C.-C. Chen, C. C.-K. Chou, Y.-C. Lin, F.-J. Lin, and S.-H. Lin
Atmos. Chem. Phys. Discuss., 14, 21433–21472, https://doi.org/10.5194/acpd-14-21433-2014, https://doi.org/10.5194/acpd-14-21433-2014, 2014
Revised manuscript has not been submitted (discussion: closed, 3 comments)
04 Aug 2014
Transport pathways of peroxyacetyl nitrate in the upper troposphere and lower stratosphere from different monsoon systems during the summer monsoon season
S. Fadnavis, K. Semeniuk, M. G. Schultz, A. Mahajan, L. Pozzoli, S. Sonbawane, and M. Kiefer
Atmos. Chem. Phys. Discuss., 14, 20159–20195, https://doi.org/10.5194/acpd-14-20159-2014, https://doi.org/10.5194/acpd-14-20159-2014, 2014
Revised manuscript not accepted (discussion: closed, 4 comments)
04 Aug 2014
A high ozone episode in winter 2013 in the Uinta Basin oil and gas region characterized by aircraft measurements
S. J. Oltmans, A. Karion, R. C. Schnell, G. Pétron, C. Sweeney, S. Wolter, D. Neff, S. A. Montzka, B. R. Miller, D. Helmig, B. J. Johnson, and J. Hueber
Atmos. Chem. Phys. Discuss., 14, 20117–20157, https://doi.org/10.5194/acpd-14-20117-2014, https://doi.org/10.5194/acpd-14-20117-2014, 2014
Revised manuscript not accepted (discussion: closed, 4 comments)
24 Jul 2014
Gas adsorption and desorption effects on cylinders and their importance for long-term gas records
M. C. Leuenberger, M. F. Schibig, and P. Nyfeler
Atmos. Chem. Phys. Discuss., 14, 19293–19314, https://doi.org/10.5194/acpd-14-19293-2014, https://doi.org/10.5194/acpd-14-19293-2014, 2014
Revised manuscript not accepted (discussion: closed, 4 comments)
22 Jul 2014
Future biogeochemical forcing in Eastern Siberia: cooling or warming?
A. Arneth, S. Olin, R. Makkonen, P. Paasonen, T. Holst, M. Kajos, M. Kulmala, T. Maximov, P. A. Miller, and G. Schurgers
Atmos. Chem. Phys. Discuss., 14, 19149–19179, https://doi.org/10.5194/acpd-14-19149-2014, https://doi.org/10.5194/acpd-14-19149-2014, 2014
Revised manuscript not accepted (discussion: closed, 3 comments)
21 Jul 2014
Long-term observation of aerosol–cloud relationships in the Mid-Atlantic of the United States
S. Li, E. Joseph, Q. Min, and B. Yin
Atmos. Chem. Phys. Discuss., 14, 18943–18960, https://doi.org/10.5194/acpd-14-18943-2014, https://doi.org/10.5194/acpd-14-18943-2014, 2014
Revised manuscript not accepted (discussion: closed, 4 comments)
27 Jun 2014
Amino acids in Antarctica: evolution and fate of marine aerosols
E. Barbaro, R. Zangrando, M. Vecchiato, R. Piazza, G. Capodaglio, C. Barbante, and A. Gambaro
Atmos. Chem. Phys. Discuss., 14, 17067–17099, https://doi.org/10.5194/acpd-14-17067-2014, https://doi.org/10.5194/acpd-14-17067-2014, 2014
Revised manuscript not accepted (discussion: closed, 5 comments)
24 Jun 2014
Emissions of organic aerosol mass, black carbon, particle number, and regulated and unregulated gases from scooters and light and heavy duty vehicles with different fuels
R. Chirico, M. Clairotte, T. W. Adam, B. Giechaskiel, M. F. Heringa, M. Elsasser, G. Martini, U. Manfredi, T. Streibel, M. Sklorz, R. Zimmermann, P. F. DeCarlo, C. Astorga, U. Baltensperger, and A. S. H. Prevot
Atmos. Chem. Phys. Discuss., 14, 16591–16639, https://doi.org/10.5194/acpd-14-16591-2014, https://doi.org/10.5194/acpd-14-16591-2014, 2014
Revised manuscript has not been submitted (discussion: closed, 2 comments)
23 May 2014
Spatial variations and development of land use regression models of levoglucosan in four European study areas
A. Jedynska, G. Hoek, M. Wang, M. Eeftens, J. Cyrys, R. Beelen, M. Cirach, A. De Nazelle, W. Nystad, H. Makarem Akhlaghi, K. Meliefste, M. Nieuwenhuijsen, K. de Hoogh, B. Brunekreef, and I. M. Kooter
Atmos. Chem. Phys. Discuss., 14, 13491–13527, https://doi.org/10.5194/acpd-14-13491-2014, https://doi.org/10.5194/acpd-14-13491-2014, 2014
Preprint withdrawn (discussion: closed, 3 comments)
21 May 2014
Spatial–temporal variations, sources, and transport of airborne inhalable metals (PM10) in urban and rural areas of northern China
X. S. Luo, C. C. M. Ip, W. Li, S. Tao, and X. D. Li
Atmos. Chem. Phys. Discuss., 14, 13133–13165, https://doi.org/10.5194/acpd-14-13133-2014, https://doi.org/10.5194/acpd-14-13133-2014, 2014
Revised manuscript not accepted (discussion: closed, 4 comments)
12 May 2014
Atmospheric winter conditions 2007/08 over the Arctic Ocean based on NP-35 data and regional model simulations
M. Mielke, N. S. Zinoviev, K. Dethloff, A. Rinke, V. J. Kustov, A. P. Makshtas, V. T. Sokolov, R. Neuber, M. Maturilli, D. Klaus, D. Handorf, and J. Graeser
Atmos. Chem. Phys. Discuss., 14, 11855–11893, https://doi.org/10.5194/acpd-14-11855-2014, https://doi.org/10.5194/acpd-14-11855-2014, 2014
Revised manuscript has not been submitted (discussion: closed, 4 comments)
30 Apr 2014
A new model of ragweed pollen release based on the analysis of meteorological conditions
L. Menut, R. Vautard, A. Colette, D. Khvorostyanov, A. Potier, L. Hamaoui-Laguel, N. Viovy, and M. Thibaudon
Atmos. Chem. Phys. Discuss., 14, 10891–10927, https://doi.org/10.5194/acpd-14-10891-2014, https://doi.org/10.5194/acpd-14-10891-2014, 2014
Revised manuscript not accepted (discussion: closed, 3 comments)
22 Apr 2014
The influence of nitrogen oxides on the activation of bromide and chloride in salt aerosol
S. Bleicher, J. C. Buxmann, R. Sander, T. P. Riedel, J. A. Thornton, U. Platt, and C. Zetzsch
Atmos. Chem. Phys. Discuss., 14, 10135–10166, https://doi.org/10.5194/acpd-14-10135-2014, https://doi.org/10.5194/acpd-14-10135-2014, 2014
Revised manuscript has not been submitted (discussion: closed, 4 comments)
31 Mar 2014
Modeling global impacts of heterogeneous loss of HO2 on cloud droplets, ice particles and aerosols
V. Huijnen, J. E. Williams, and J. Flemming
Atmos. Chem. Phys. Discuss., 14, 8575–8632, https://doi.org/10.5194/acpd-14-8575-2014, https://doi.org/10.5194/acpd-14-8575-2014, 2014
Revised manuscript not accepted (discussion: closed, 8 comments)
31 Mar 2014
Non-agricultural ammonia emissions in urban China
Y. H. Chang
Atmos. Chem. Phys. Discuss., 14, 8495–8531, https://doi.org/10.5194/acpd-14-8495-2014, https://doi.org/10.5194/acpd-14-8495-2014, 2014
Revised manuscript has not been submitted (discussion: closed, 4 comments)
18 Mar 2014
Extreme haze pollution in Beijing during January 2013: chemical characteristics, formation mechanism and role of fog processing
K. Huang, G. Zhuang, Q. Wang, J. S. Fu, Y. Lin, T. Liu, L. Han, and C. Deng
Atmos. Chem. Phys. Discuss., 14, 7517–7556, https://doi.org/10.5194/acpd-14-7517-2014, https://doi.org/10.5194/acpd-14-7517-2014, 2014
Revised manuscript not accepted (discussion: closed, 9 comments)
21 Feb 2014
Vehicular emissions in China in 2006 and 2010
N. Chao, G. Tang, Y. Wang, H. Wang, J. Huang, and J. Chen
Atmos. Chem. Phys. Discuss., 14, 4905–4956, https://doi.org/10.5194/acpd-14-4905-2014, https://doi.org/10.5194/acpd-14-4905-2014, 2014
Revised manuscript not accepted (discussion: closed, 4 comments)
21 Feb 2014
Contribution of airborne dust particles to HONO sources
N. A. Saliba, S. G. Moussa, and G. El Tayyar
Atmos. Chem. Phys. Discuss., 14, 4827–4839, https://doi.org/10.5194/acpd-14-4827-2014, https://doi.org/10.5194/acpd-14-4827-2014, 2014
Revised manuscript not accepted (discussion: closed, 5 comments)
17 Feb 2014
Importance of aerosols for annual lightning production at global scale
S. Venevsky
Atmos. Chem. Phys. Discuss., 14, 4303–4325, https://doi.org/10.5194/acpd-14-4303-2014, https://doi.org/10.5194/acpd-14-4303-2014, 2014
Revised manuscript not accepted (discussion: closed, 4 comments)
04 Feb 2014
Determination of α-pinene-derived organic nitrate yields: particle phase partitioning and hydrolysis
J. D. Rindelaub, K. M. McAvey, and P. B. Shepson
Atmos. Chem. Phys. Discuss., 14, 3301–3335, https://doi.org/10.5194/acpd-14-3301-2014, https://doi.org/10.5194/acpd-14-3301-2014, 2014
Revised manuscript not accepted (discussion: closed, 4 comments)
31 Jan 2014
Analysis of the global atmospheric methane budget using ECHAM-MOZ simulations for present-day, pre-industrial time and the Last Glacial Maximum
A. Basu, M. G. Schultz, S. Schröder, L. Francois, X. Zhang, G. Lohmann, and T. Laepple
Atmos. Chem. Phys. Discuss., 14, 3193–3230, https://doi.org/10.5194/acpd-14-3193-2014, https://doi.org/10.5194/acpd-14-3193-2014, 2014
Revised manuscript not accepted (discussion: closed, 4 comments)
24 Jan 2014
Source apportionment and the role of meteorological conditions in the assessment of air pollution exposure due to urban emissions
K. Schäfer, M. Elsasser, J. M. Arteaga-Salas, J. Gu, M. Pitz, J. Schnelle-Kreis, J. Cyrys, S. Emeis, A. S. H. Prevot, and R. Zimmermann
Atmos. Chem. Phys. Discuss., 14, 2235–2275, https://doi.org/10.5194/acpd-14-2235-2014, https://doi.org/10.5194/acpd-14-2235-2014, 2014
Revised manuscript not accepted (discussion: closed, 3 comments)
17 Jan 2014
Where do the air masses between double tropopauses come from?
A. C. Parracho, C. A. F. Marques, and J. M. Castanheira
Atmos. Chem. Phys. Discuss., 14, 1349–1374, https://doi.org/10.5194/acpd-14-1349-2014, https://doi.org/10.5194/acpd-14-1349-2014, 2014
Revised manuscript not accepted (discussion: closed, 4 comments)
16 Jan 2014
The changing oxidizing environment in London – trends in ozone precursors and their contribution to ozone production
E. von Schneidemesser, M. Vieno, and P. S. Monks
Atmos. Chem. Phys. Discuss., 14, 1287–1316, https://doi.org/10.5194/acpd-14-1287-2014, https://doi.org/10.5194/acpd-14-1287-2014, 2014
Revised manuscript not accepted (discussion: closed, 3 comments)
07 Jan 2014
Model study on the dependence of primary marine aerosol emission on the sea surface temperature
S. Barthel, I. Tegen, R. Wolke, and M. van Pinxteren
Atmos. Chem. Phys. Discuss., 14, 377–434, https://doi.org/10.5194/acpd-14-377-2014, https://doi.org/10.5194/acpd-14-377-2014, 2014
Revised manuscript not accepted (discussion: closed, 6 comments)
10 Dec 2013
Size-resolved and integral measurements of cloud condensation nuclei (CCN) at the high-alpine site Jungfraujoch
D. Rose, S. S. Gunthe, Z. Jurányi, M. Gysel, G. P. Frank, J. Schneider, J. Curtius, and U. Pöschl
Atmos. Chem. Phys. Discuss., 13, 32575–32624, https://doi.org/10.5194/acpd-13-32575-2013, https://doi.org/10.5194/acpd-13-32575-2013, 2013
Revised manuscript has not been submitted (discussion: closed, 4 comments)
10 Dec 2013
Biomass burning aerosol properties over the Northern Great Plains during the 2012 warm season
T. Logan, B. Xi, and X. Dong
Atmos. Chem. Phys. Discuss., 13, 32269–32289, https://doi.org/10.5194/acpd-13-32269-2013, https://doi.org/10.5194/acpd-13-32269-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
11 Nov 2013
Atmospheric black carbon can exhibit enhanced light absorption at high relative humidity
Y. Wei, Q. Zhang, and J. E. Thompson
Atmos. Chem. Phys. Discuss., 13, 29413–29445, https://doi.org/10.5194/acpd-13-29413-2013, https://doi.org/10.5194/acpd-13-29413-2013, 2013
Revised manuscript has not been submitted (discussion: closed, 9 comments)
04 Nov 2013
Perturbations in relative humidity in the boundary layer represent a possible mechanism for the formation of small convective clouds
E. Hirsch, I. Koren, O. Altaratz, Z. Levin, and E. Agassi
Atmos. Chem. Phys. Discuss., 13, 28729–28749, https://doi.org/10.5194/acpd-13-28729-2013, https://doi.org/10.5194/acpd-13-28729-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
21 Oct 2013
Ozone production in four major cities of China: sensitivity to ozone precursors and heterogeneous processes
L. K. Xue, T. Wang, J. Gao, A. J. Ding, X. H. Zhou, D. R. Blake, X. F. Wang, S. M. Saunders, S. J. Fan, H. C. Zuo, Q. Z. Zhang, and W. X. Wang
Atmos. Chem. Phys. Discuss., 13, 27243–27285, https://doi.org/10.5194/acpd-13-27243-2013, https://doi.org/10.5194/acpd-13-27243-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
15 Oct 2013
Identification of column-integrated dominant aerosols using the archive of AERONET data set
Y. Choi, Y. S. Ghim, and B. N. Holben
Atmos. Chem. Phys. Discuss., 13, 26627–26656, https://doi.org/10.5194/acpd-13-26627-2013, https://doi.org/10.5194/acpd-13-26627-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
14 Oct 2013
Atmospheric inversion of the surface CO2 flux with 13CO2 constraint
J. M. Chen, G. Mo, and F. Deng
Atmos. Chem. Phys. Discuss., 13, 26529–26578, https://doi.org/10.5194/acpd-13-26529-2013, https://doi.org/10.5194/acpd-13-26529-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
09 Oct 2013
Biogenic isoprene and implications for oxidant levels in Beijing during the 2008 Olympic Games
C.-C. Chang, M. Shao, C. C. K. Chou, S.-C. Liu, J.-L. Wang, K.-Z. Lee, C.-H. Lai, T. Zhu, and P.-H. Lin
Atmos. Chem. Phys. Discuss., 13, 25939–25967, https://doi.org/10.5194/acpd-13-25939-2013, https://doi.org/10.5194/acpd-13-25939-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
02 Oct 2013
An explicit study of aerosol mass conversion and its parameterization in warm rain formation of cumulus clouds
J. Sun, J. Fen, and R. K. Ungar
Atmos. Chem. Phys. Discuss., 13, 25481–25536, https://doi.org/10.5194/acpd-13-25481-2013, https://doi.org/10.5194/acpd-13-25481-2013, 2013
Revised manuscript has not been submitted (discussion: closed, 4 comments)
10 Sep 2013
The sensitivity of global climate to the episodicity of fire aerosol emissions
S. K. Clark, D. S. Ward, and N. M. Mahowald
Atmos. Chem. Phys. Discuss., 13, 23691–23717, https://doi.org/10.5194/acpd-13-23691-2013, https://doi.org/10.5194/acpd-13-23691-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
06 Sep 2013
Global stratospheric chlorine inventories for 2004–2009 from Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) measurements
A. T. Brown, M. P. Chipperfield, S. Dhomse, C. Boone, and P. F. Bernath
Atmos. Chem. Phys. Discuss., 13, 23491–23548, https://doi.org/10.5194/acpd-13-23491-2013, https://doi.org/10.5194/acpd-13-23491-2013, 2013
Revised manuscript has not been submitted (discussion: closed, 2 comments)
05 Sep 2013
Satellite-based estimate of aerosol direct radiative effect over the South-East Atlantic
L. Costantino and F.-M. Bréon
Atmos. Chem. Phys. Discuss., 13, 23295–23324, https://doi.org/10.5194/acpd-13-23295-2013, https://doi.org/10.5194/acpd-13-23295-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
04 Sep 2013
Kinetic study of esterification of sulfuric acid with alcohols in aerosol bulk phase
J. Li and M. Jang
Atmos. Chem. Phys. Discuss., 13, 23217–23250, https://doi.org/10.5194/acpd-13-23217-2013, https://doi.org/10.5194/acpd-13-23217-2013, 2013
Revised manuscript not accepted (discussion: closed, 5 comments)
30 Aug 2013
Analysis of a strong wildfire event over Valencia (Spain) during Summer 2012 – Part 1: Aerosol microphysics and optical properties
J. L. Gómez-Amo, V. Estellés, S. Segura, C. Marcos, A. R. Esteve, R. Pedrós, M. P. Utrillas, and J. A. Martínez-Lozano
Atmos. Chem. Phys. Discuss., 13, 22639–22685, https://doi.org/10.5194/acpd-13-22639-2013, https://doi.org/10.5194/acpd-13-22639-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
26 Aug 2013
Characterization of minerals in air dust particles in the state of Tamilnadu, India through ftir spectroscopy
R. Senthil Kumar and P. Rajkumar
Atmos. Chem. Phys. Discuss., 13, 22221–22248, https://doi.org/10.5194/acpd-13-22221-2013, https://doi.org/10.5194/acpd-13-22221-2013, 2013
Revised manuscript not accepted (discussion: closed, 6 comments)
21 Aug 2013
Primary productivity and its variability in the equatorial South China Sea during the northeast monsoon
S. H. Ooi, A. A. Samah, and P. Braesicke
Atmos. Chem. Phys. Discuss., 13, 21573–21608, https://doi.org/10.5194/acpd-13-21573-2013, https://doi.org/10.5194/acpd-13-21573-2013, 2013
Preprint withdrawn (discussion: closed, 4 comments)
16 Aug 2013
Influence of anthropogenic aerosols on the Asian monsoon: a case study using the WRF-Chem model
X. Jiang, M. C. Barth, C. Wiedinmyer, and S. T. Massie
Atmos. Chem. Phys. Discuss., 13, 21383–21425, https://doi.org/10.5194/acpd-13-21383-2013, https://doi.org/10.5194/acpd-13-21383-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
07 Aug 2013
Modelling the chemistry and transport of bromoform within a sea breeze driven convective system during the SHIVA Campaign
P. D. Hamer, V. Marécal, R. Hossaini, M. Pirre, N. Warwick, M. Chipperfield, A. A. Samah, N. Harris, A. Robinson, B. Quack, A. Engel, K. Krüger, E. Atlas, K. Subramaniam, D. Oram, Emma C. Leedham Elvidge, G. Mills, K. Pfeilsticker, S. Sala, T. Keber, H. Bönisch, L. K. Peng, M. S. M. Nadzir, P. T. Lim, A. Mujahid, A. Anton, H. Schlager, V. Catoire, G. Krysztofiak, S. Fühlbrügge, M. Dorf, and W. T. Sturges
Atmos. Chem. Phys. Discuss., 13, 20611–20676, https://doi.org/10.5194/acpd-13-20611-2013, https://doi.org/10.5194/acpd-13-20611-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
21 Jun 2013
Diurnal variations of total carbon, dicarboxylic acids, ketoacids and α-dicarbonyls in aerosols in the northern vicinity of Beijing
N. He, K. Kawamura, K. Okuzawa, Y. Kanaya, and Z. F. Wang
Atmos. Chem. Phys. Discuss., 13, 16699–16731, https://doi.org/10.5194/acpd-13-16699-2013, https://doi.org/10.5194/acpd-13-16699-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
03 Jun 2013
Comparing the cloud vertical structure derived from several methods based on measured atmospheric profiles and active surface measurements
M. Costa-Surós, J. Calbó, J. A. González, and C. N. Long
Atmos. Chem. Phys. Discuss., 13, 14405–14445, https://doi.org/10.5194/acpd-13-14405-2013, https://doi.org/10.5194/acpd-13-14405-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
28 May 2013
An evaluation of the CMAQ reproducibility of satellite tropospheric NO2 column observations at different local times over East Asia
H. Irie, K. Yamaji, K. Ikeda, I. Uno, S. Itahashi, T. Ohara, and J. Kurokawa
Atmos. Chem. Phys. Discuss., 13, 14037–14067, https://doi.org/10.5194/acpd-13-14037-2013, https://doi.org/10.5194/acpd-13-14037-2013, 2013
Preprint withdrawn (discussion: closed, 6 comments)
23 May 2013
Water-soluble organic carbon over the Pearl River Delta region during fall–winter: spatial variations and source apportionment
X. Ding, X.-M. Wang, Q.-F. He, X.-X. Fu, and B. Gao
Atmos. Chem. Phys. Discuss., 13, 13773–13798, https://doi.org/10.5194/acpd-13-13773-2013, https://doi.org/10.5194/acpd-13-13773-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
22 May 2013
Cross-validation of inferred daytime airborne CO2 urban-regional scale surface fluxes with eddy-covariance observations and emissions inventories in Greater London
A. Font, C. S. B. Grimmond, J.-A. Morguí, S. Kotthaus, M. Priestman, and B. Barratt
Atmos. Chem. Phys. Discuss., 13, 13465–13493, https://doi.org/10.5194/acpd-13-13465-2013, https://doi.org/10.5194/acpd-13-13465-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
14 May 2013
Simulation of trace gases and aerosols over the Indian domain: evaluation of the WRF-Chem Model
M. Michael, A. Yadav, S. N. Tripathi, V. P. Kanawade, A. Gaur, P. Sadavarte, and C. Venkataraman
Atmos. Chem. Phys. Discuss., 13, 12287–12336, https://doi.org/10.5194/acpd-13-12287-2013, https://doi.org/10.5194/acpd-13-12287-2013, 2013
Revised manuscript has not been submitted (discussion: closed, 3 comments)
29 Apr 2013
Stratospheric SO2 and sulphate aerosol, model simulations and satellite observations
C. Brühl, J. Lelieveld, M. Höpfner, and H. Tost
Atmos. Chem. Phys. Discuss., 13, 11395–11425, https://doi.org/10.5194/acpd-13-11395-2013, https://doi.org/10.5194/acpd-13-11395-2013, 2013
Revised manuscript not accepted (discussion: closed, 7 comments)
22 Apr 2013
Analysis of upper-tropospheric humidity in tropical descent regions using observed and modelled radiances
V. O. John, D. E. Parker, S. A. Buehler, J. Price, and R. W. Saunders
Atmos. Chem. Phys. Discuss., 13, 10547–10560, https://doi.org/10.5194/acpd-13-10547-2013, https://doi.org/10.5194/acpd-13-10547-2013, 2013
Revised manuscript has not been submitted (discussion: closed, 3 comments)
02 Apr 2013
Evaluation of various methods to measure particulate bound mercury and associated artifacts
S. Wang, T. M. Holsen, J. Huang, and Y.-J. Han
Atmos. Chem. Phys. Discuss., 13, 8585–8614, https://doi.org/10.5194/acpd-13-8585-2013, https://doi.org/10.5194/acpd-13-8585-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
18 Mar 2013
Evolution of multispectral aerosol optical properties in a biogenically-influenced urban environment during the CARES campaign
M. Gyawali, W. P. Arnott, R. A. Zaveri, C. Song, M. Pekour, B. Flowers, M. K. Dubey, A. Setyan, Q. Zhang, J. W. Harworth, J. G. Radney, D. B. Atkinson, S. China, C. Mazzoleni, K. Gorkowski, R. Subramanian, B. T. Jobson, and H. Moosmüller
Atmos. Chem. Phys. Discuss., 13, 7113–7150, https://doi.org/10.5194/acpd-13-7113-2013, https://doi.org/10.5194/acpd-13-7113-2013, 2013
Revised manuscript not accepted (discussion: closed, 9 comments)
13 Mar 2013
Year-round observations of water-soluble ionic species and trace metals in Sapporo aerosols: implication for significant contributions from terrestrial biological sources in Northeast Asia
C. M. Pavuluri, K. Kawamura, N. Mihalopoulos, and P. Fu
Atmos. Chem. Phys. Discuss., 13, 6589–6629, https://doi.org/10.5194/acpd-13-6589-2013, https://doi.org/10.5194/acpd-13-6589-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
15 Feb 2013
Long-range transport of biomass burning smoke to Finland in 2006
L. Riuttanen, M. Dal Maso, G. de Leeuw, I. Riipinen, L. Sogacheva, V. Vakkari, L. Laakso, and M. Kulmala
Atmos. Chem. Phys. Discuss., 13, 4289–4330, https://doi.org/10.5194/acpd-13-4289-2013, https://doi.org/10.5194/acpd-13-4289-2013, 2013
Revised manuscript has not been submitted (discussion: closed, 5 comments)
13 Feb 2013
Stratospheric and tropospheric SSU/MSU temperature trends and compared to reanalyses and IPCC CMIP5 simulations in 1979–2005
A. M. Powell Jr., J. Xu, C.-Z. Zou, and L. Zhao
Atmos. Chem. Phys. Discuss., 13, 3957–3992, https://doi.org/10.5194/acpd-13-3957-2013, https://doi.org/10.5194/acpd-13-3957-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
06 Feb 2013
Investigation of the connections between atmospheric new particle formation and organics at an urban site of Beijing
Z. B. Wang, M. Hu, Z. J. Wu, D. L. Yue, J. Zheng, R. Y. Zhang, X. Y. Pei, P. Paasonen, M. Dal Maso, M. Boy, and A. Wiedensohler
Atmos. Chem. Phys. Discuss., 13, 3419–3450, https://doi.org/10.5194/acpd-13-3419-2013, https://doi.org/10.5194/acpd-13-3419-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
24 Jan 2013
Size distributions of mineral aerosols and dust emission flux observed over Horqin Sandy Land area in northern China
X. Li and H. S. Zhang
Atmos. Chem. Phys. Discuss., 13, 2671–2693, https://doi.org/10.5194/acpd-13-2671-2013, https://doi.org/10.5194/acpd-13-2671-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
22 Jan 2013
Total sulphate vs. sulphuric acid monomer in nucleation studies: which represents the "true" concentration?
K. Neitola, D. Brus, U. Makkonen, M. Sipilä, R. L. Mauldin III, K. Kyllönen, H. Lihavainen, and M. Kulmala
Atmos. Chem. Phys. Discuss., 13, 2313–2350, https://doi.org/10.5194/acpd-13-2313-2013, https://doi.org/10.5194/acpd-13-2313-2013, 2013
Revised manuscript not accepted (discussion: closed, 6 comments)
15 Jan 2013
New particle formation in the western Yangtze River Delta: first data from SORPES-station
E. Herrmann, A. J. Ding, T. Petäjä, X. Q. Yang, J. N. Sun, X. M. Qi, H. Manninen, J. Hakala, T. Nieminen, P. P. Aalto, V.-M. Kerminen, M. Kulmala, and C. B. Fu
Atmos. Chem. Phys. Discuss., 13, 1455–1488, https://doi.org/10.5194/acpd-13-1455-2013, https://doi.org/10.5194/acpd-13-1455-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
14 Jan 2013
Source apportionment of ambient fine particle from combined size distribution and chemical composition data during summertime in Beijing
Z. R. Liu, Y. S. Wang, Q. Liu, B. Hu, and Y. Sun
Atmos. Chem. Phys. Discuss., 13, 1367–1397, https://doi.org/10.5194/acpd-13-1367-2013, https://doi.org/10.5194/acpd-13-1367-2013, 2013
Revised manuscript not accepted (discussion: closed, 4 comments)
21 Dec 2012
Programmable thermal dissociation of reactive gaseous mercury – a potential approach to chemical speciation: results from a field study
C. Tatum Ernest, D. Donohoue, D. Bauer, A. Ter Schure, and A. J. Hynes
Atmos. Chem. Phys. Discuss., 12, 33291–33322, https://doi.org/10.5194/acpd-12-33291-2012, https://doi.org/10.5194/acpd-12-33291-2012, 2012
Revised manuscript not accepted (discussion: closed, 4 comments)
11 Dec 2012
Wintertime peroxyacetyl nitrate (PAN) in the megacity Beijing: the role of photochemical and meteorological processes
H. Zhang, X. Xu, W. Lin, and Y. Wang
Atmos. Chem. Phys. Discuss., 12, 31871–31916, https://doi.org/10.5194/acpd-12-31871-2012, https://doi.org/10.5194/acpd-12-31871-2012, 2012
Revised manuscript not accepted (discussion: closed, 4 comments)
07 Dec 2012
Climatology of middle atmospheric water vapour above the ALOMAR observatory in northern Norway
K. Hallgren, P. Hartogh, and C. Jarchow
Atmos. Chem. Phys. Discuss., 12, 31531–31560, https://doi.org/10.5194/acpd-12-31531-2012, https://doi.org/10.5194/acpd-12-31531-2012, 2012
Revised manuscript has not been submitted (discussion: closed, 2 comments)
22 Nov 2012
An analysis of atmospheric CH4 concentrations from 1984 to 2008 with a single box atmospheric chemistry model
Z. Tan and Q. Zhuang
Atmos. Chem. Phys. Discuss., 12, 30259–30282, https://doi.org/10.5194/acpd-12-30259-2012, https://doi.org/10.5194/acpd-12-30259-2012, 2012
Revised manuscript not accepted (discussion: closed, 4 comments)
21 Nov 2012
The albedo properties of four clean stratocumulus clouds studied during the VOCALS-REX field campaign
B. Parkes, P. Rosenberg, A. Gadian, A. Blyth, and J. Latham
Atmos. Chem. Phys. Discuss., 12, 30021–30037, https://doi.org/10.5194/acpd-12-30021-2012, https://doi.org/10.5194/acpd-12-30021-2012, 2012
Revised manuscript not accepted (discussion: closed, 7 comments)
20 Nov 2012
Impact of the aging process of black carbon aerosols on their spatial distribution, hygroscopicity, and radiative forcing in a global climate model
D. Goto, N. Oshima, T. Nakajima, T. Takemura, and T. Ohara
Atmos. Chem. Phys. Discuss., 12, 29801–29849, https://doi.org/10.5194/acpd-12-29801-2012, https://doi.org/10.5194/acpd-12-29801-2012, 2012
Revised manuscript not accepted (discussion: closed, 6 comments)
26 Oct 2012
A compressed super-parameterization: test of NAM-SCA under single-column GCM configurations
J.-I. Yano, S. K. Cheedela, and G. L. Roff
Atmos. Chem. Phys. Discuss., 12, 28237–28303, https://doi.org/10.5194/acpd-12-28237-2012, https://doi.org/10.5194/acpd-12-28237-2012, 2012
Revised manuscript not accepted (discussion: closed, 6 comments)
25 Oct 2012
On the structure of the extra-tropical transition layer from in-situ observations
I. Pisso, K. S. Law, F. Fierli, P. H. Haynes, P. Hoor, E. Palazzi, F. Ravegnani, and S. Viciani
Atmos. Chem. Phys. Discuss., 12, 28033–28068, https://doi.org/10.5194/acpd-12-28033-2012, https://doi.org/10.5194/acpd-12-28033-2012, 2012
Revised manuscript has not been submitted (discussion: closed, 2 comments)
05 Oct 2012
Tropospheric impact of methane emissions from clathrates in the Arctic Region
S. Bhattacharyya, P. Cameron-Smith, D. Bergmann, M. Reagan, S. Elliott, and G. Moridis
Atmos. Chem. Phys. Discuss., 12, 26477–26502, https://doi.org/10.5194/acpd-12-26477-2012, https://doi.org/10.5194/acpd-12-26477-2012, 2012
Revised manuscript not accepted (discussion: closed, 4 comments)
21 Sep 2012
Anthropogenic, biomass burning, and volcanic emissions of black carbon, organic carbon, and SO2 from 1980 to 2010 for hindcast model experiments
T. Diehl, A. Heil, M. Chin, X. Pan, D. Streets, M. Schultz, and S. Kinne
Atmos. Chem. Phys. Discuss., 12, 24895–24954, https://doi.org/10.5194/acpd-12-24895-2012, https://doi.org/10.5194/acpd-12-24895-2012, 2012
Revised manuscript not accepted (discussion: closed, 4 comments)
21 Sep 2012
Are black carbon and soot the same?
P. R. Buseck, K. Adachi, A. Gelencsér, É. Tompa, and M. Pósfai
Atmos. Chem. Phys. Discuss., 12, 24821–24846, https://doi.org/10.5194/acpd-12-24821-2012, https://doi.org/10.5194/acpd-12-24821-2012, 2012
Revised manuscript not accepted (discussion: closed, 10 comments)
13 Sep 2012
An empirical model of global climate – Part 2: Implications for future temperature
N. R. Mascioli, T. Canty, and R. J. Salawitch
Atmos. Chem. Phys. Discuss., 12, 23913–23974, https://doi.org/10.5194/acpd-12-23913-2012, https://doi.org/10.5194/acpd-12-23913-2012, 2012
Revised manuscript not accepted (discussion: closed, 2 comments)
12 Sep 2012
A discrepancy in precipitable water among reanalyses and the impact of forcing dataset on downscaling in the tropics
H. G. Takahashi, M. Hara, M. Fujita, and T. Yoshikane
Atmos. Chem. Phys. Discuss., 12, 23759–23791, https://doi.org/10.5194/acpd-12-23759-2012, https://doi.org/10.5194/acpd-12-23759-2012, 2012
Revised manuscript not accepted (discussion: closed, 4 comments)
28 Aug 2012
Single particle characterization of black carbon aerosol in the Northeast Tibetan Plateau, China
Q. Y. Wang, J. P. Schwarz, J. J. Cao, R. S. Gao, D. W. Fahey, and T. F. Hu
Atmos. Chem. Phys. Discuss., 12, 21947–21976, https://doi.org/10.5194/acpd-12-21947-2012, https://doi.org/10.5194/acpd-12-21947-2012, 2012
Revised manuscript not accepted (discussion: closed, 4 comments)
14 Aug 2012
Measurements of ice nucleation by mineral dusts in the contact mode
K. W. Bunker, S. China, C. Mazzoleni, A. Kostinski, and W. Cantrell
Atmos. Chem. Phys. Discuss., 12, 20291–20309, https://doi.org/10.5194/acpd-12-20291-2012, https://doi.org/10.5194/acpd-12-20291-2012, 2012
Revised manuscript not accepted (discussion: closed, 5 comments)
07 Aug 2012
Direct and disequilibrium effects on precipitation in transient climates
D. McInerney and E. Moyer
Atmos. Chem. Phys. Discuss., 12, 19649–19681, https://doi.org/10.5194/acpd-12-19649-2012, https://doi.org/10.5194/acpd-12-19649-2012, 2012
Revised manuscript not accepted (discussion: closed, 6 comments)
07 Aug 2012
Upwelling into the lower stratosphere forced by breaking tropical waves: evidence from chemical tracers
Z. Engida and I. Folkins
Atmos. Chem. Phys. Discuss., 12, 19571–19615, https://doi.org/10.5194/acpd-12-19571-2012, https://doi.org/10.5194/acpd-12-19571-2012, 2012
Revised manuscript has not been submitted (discussion: closed, 4 comments)
16 Jul 2012
A new El Niño-Southern Oscillation forecasting tool based on Southern Oscillation Index
C. A. Varotsos and C. Tzanis
Atmos. Chem. Phys. Discuss., 12, 17443–17463, https://doi.org/10.5194/acpd-12-17443-2012, https://doi.org/10.5194/acpd-12-17443-2012, 2012
Revised manuscript not accepted (discussion: closed, 3 comments)
05 Jul 2012
Measurements and modelling of ozone in the Mediterranean MBL: an investigation of the importance of ship emissions to local ozone production
I. M. Hedgecock, C. N. Gencarelli, G. J. Sch{ü}rmann, F. Sprovieri, and N. Pirrone
Atmos. Chem. Phys. Discuss., 12, 16557–16602, https://doi.org/10.5194/acpd-12-16557-2012, https://doi.org/10.5194/acpd-12-16557-2012, 2012
Revised manuscript not accepted (discussion: closed, 4 comments)
13 Jun 2012
Atmospheric organic-phase photo-sensitized epoxidation of alkenes by α-dicarbonyls
G. Yu and F. N. Keutsch
Atmos. Chem. Phys. Discuss., 12, 15115–15138, https://doi.org/10.5194/acpd-12-15115-2012, https://doi.org/10.5194/acpd-12-15115-2012, 2012
Revised manuscript has not been submitted (discussion: closed, 2 comments)
07 Jun 2012
Chemical and microphysical properties of the aerosol during foggy and nonfoggy episodes: a relationship between organic and inorganic content of the aerosol
D. S. Kaul, T. Gupta, and S. N. Tripathi
Atmos. Chem. Phys. Discuss., 12, 14483–14524, https://doi.org/10.5194/acpd-12-14483-2012, https://doi.org/10.5194/acpd-12-14483-2012, 2012
Revised manuscript not accepted (discussion: closed, 6 comments)
07 Jun 2012
Estimation of lifetime of carbonaceous aerosol from open crop residue burning during Mount Tai Experiment 2006 (MTX2006)
X. L. Pan, Y. Kanaya, Z. F. Wang, Y. Komazaki, F. Taketani, H. Akimoto, P. Pochanart, and Y. Liu
Atmos. Chem. Phys. Discuss., 12, 14363–14392, https://doi.org/10.5194/acpd-12-14363-2012, https://doi.org/10.5194/acpd-12-14363-2012, 2012
Revised manuscript not accepted (discussion: closed, 4 comments)
25 May 2012
Using non-negative matrix factorization for the identification of daily patterns of particulate air pollution in Beijing during 2004–2008
A. Thiem, U. Schlink, X.-C. Pan, M. Hu, A. Peters, A. Wiedensohler, S. Breitner, J. Cyrys, B. Wehner, C. Rösch, and U. Franck
Atmos. Chem. Phys. Discuss., 12, 13015–13052, https://doi.org/10.5194/acpd-12-13015-2012, https://doi.org/10.5194/acpd-12-13015-2012, 2012
Revised manuscript not accepted (discussion: closed, 7 comments)
09 May 2012
Impact of meteorological analyses and chemical data assimilation on modelled long-term changes in stratospheric NO2
L. N. Gunn, M. P. Chipperfield, W. Feng, M. Van Roozendael, M. Gil, M. Yela, P. V. Johnston, K. Kreher, and S. W. Wood
Atmos. Chem. Phys. Discuss., 12, 12023–12050, https://doi.org/10.5194/acpd-12-12023-2012, https://doi.org/10.5194/acpd-12-12023-2012, 2012
Preprint withdrawn (discussion: closed, 4 comments)
08 May 2012
Formation and growth of nucleated particles: observational constraints on cloud condensation nuclei budgets
D. M. Westervelt, I. Riipinen, J. R. Pierce, W. Trivitayanurak, and P. J. Adams
Atmos. Chem. Phys. Discuss., 12, 11765–11822, https://doi.org/10.5194/acpd-12-11765-2012, https://doi.org/10.5194/acpd-12-11765-2012, 2012
Revised manuscript has not been submitted (discussion: closed, 3 comments)
24 Apr 2012
Anthropogenic CO2 flux constraints in the Tokyo Bay Area from Lagrangian diffusive backward trajectories and high resolution in situ measurements
I. Pisso, P. Patra, M. Takigawa, T. Machida, H. Matsueda, and Y. Sawa
Atmos. Chem. Phys. Discuss., 12, 10623–10649, https://doi.org/10.5194/acpd-12-10623-2012, https://doi.org/10.5194/acpd-12-10623-2012, 2012
Revised manuscript not accepted (discussion: closed, 4 comments)
24 Apr 2012
Merging aerosol optical depth data from multiple satellite missions to view agricultural biomass burning in Central and East China
Y. Xue, H. Xu, L. Mei, J. Guang, J. Guo, Y. Li, T. Hou, C. Li, L. Yang, and X. He
Atmos. Chem. Phys. Discuss., 12, 10461–10492, https://doi.org/10.5194/acpd-12-10461-2012, https://doi.org/10.5194/acpd-12-10461-2012, 2012
Revised manuscript not accepted (discussion: closed, 4 comments)
29 Mar 2012
Chemical characterization of particle emissions from controlled burns of biomass fuels using a high resolution time-of-flight aerosol mass spectrometer
L. Qi, S. Hosseini, H. Jung, B. Yokelson, D. Weise, D. Cocker III, and Y. Huang
Atmos. Chem. Phys. Discuss., 12, 8397–8432, https://doi.org/10.5194/acpd-12-8397-2012, https://doi.org/10.5194/acpd-12-8397-2012, 2012
Preprint withdrawn (discussion: closed, 1 comment)
02 Mar 2012
Estimation of biogenic volatile organic compound (BVOC) emissions from the terrestrial ecosystem in China using real-time remote sensing data
M. Li, X. Huang, J. Li, and Y. Song
Atmos. Chem. Phys. Discuss., 12, 6551–6592, https://doi.org/10.5194/acpd-12-6551-2012, https://doi.org/10.5194/acpd-12-6551-2012, 2012
Revised manuscript not accepted (discussion: closed, 4 comments)
29 Feb 2012
Ozone pollution over the Arabian Gulf – role of meteorological conditions
L. Smoydzin, M. Fnais, and J. Lelieveld
Atmos. Chem. Phys. Discuss., 12, 6331–6361, https://doi.org/10.5194/acpd-12-6331-2012, https://doi.org/10.5194/acpd-12-6331-2012, 2012
Revised manuscript has not been submitted (discussion: closed, 3 comments)
27 Feb 2012
Analysis of the vertical structure and size distribution of dust aerosols over the semi-arid region of the Loess Plateau in China
B. Zhou, L. Zhang, X. Cao, X. Li, J. Huang, J. Shi, and J. Bi
Atmos. Chem. Phys. Discuss., 12, 6113–6143, https://doi.org/10.5194/acpd-12-6113-2012, https://doi.org/10.5194/acpd-12-6113-2012, 2012
Revised manuscript has not been submitted (discussion: closed, 3 comments)
22 Feb 2012
Methanol-CO correlations in Mexico City pollution outflow from aircraft and satellite during MILAGRO
Y. Xiao, K. E. Cady-Pereira, V. H. Payne, D. B. Millet, M. W. Shephard, M. Luo, M. Alvarado, K. C. Wells, E. C. Apel, T. L. Campos, H. B. Singh, and G. W. Sachse
Atmos. Chem. Phys. Discuss., 12, 5705–5738, https://doi.org/10.5194/acpd-12-5705-2012, https://doi.org/10.5194/acpd-12-5705-2012, 2012
Revised manuscript not accepted (discussion: closed, 4 comments)
21 Feb 2012
Aerosol-precipitation interactions in the southern Appalachian Mountains
G. M. Kelly, B. F. Taubman, L. B. Perry, J. P. Sherman, P. T. Soulé, and P. J. Sheridan
Atmos. Chem. Phys. Discuss., 12, 5487–5517, https://doi.org/10.5194/acpd-12-5487-2012, https://doi.org/10.5194/acpd-12-5487-2012, 2012
Revised manuscript not accepted (discussion: closed, 4 comments)
20 Feb 2012
Quantification of diesel exhaust gas phase organics by a thermal desorption proton transfer reaction mass spectrometer
M. H. Erickson, H. W. Wallace, and B. T. Jobson
Atmos. Chem. Phys. Discuss., 12, 5389–5423, https://doi.org/10.5194/acpd-12-5389-2012, https://doi.org/10.5194/acpd-12-5389-2012, 2012
Preprint withdrawn (discussion: closed, 3 comments)
10 Feb 2012
Observations of total peroxy nitrates and total alkyl nitrates during the OP3 campaign: isoprene nitrate chemistry above a south-east Asian tropical rain forest
E. Aruffo, P. Di Carlo, C. Dari-Salisburgo, F. Biancofiore, F. Giammaria, J. Lee, S. Moller, M. J. Evans, J. R. Hopkins, C. Jones, A. R. MacKenzie, and C. N. Hewitt
Atmos. Chem. Phys. Discuss., 12, 4797–4829, https://doi.org/10.5194/acpd-12-4797-2012, https://doi.org/10.5194/acpd-12-4797-2012, 2012
Revised manuscript not accepted (discussion: closed, 6 comments)
01 Feb 2012
Effects of cosmic ray decreases on cloud microphysics
J. Svensmark, M. B. Enghoff, and H. Svensmark
Atmos. Chem. Phys. Discuss., 12, 3595–3617, https://doi.org/10.5194/acpd-12-3595-2012, https://doi.org/10.5194/acpd-12-3595-2012, 2012
Revised manuscript not accepted (discussion: closed, 14 comments)
27 Jan 2012
A permanent aerosol layer at the tropical tropopause layer driven by the intertropical convergence zone
Q. Bourgeois, I. Bey, and P. Stier
Atmos. Chem. Phys. Discuss., 12, 2863–2889, https://doi.org/10.5194/acpd-12-2863-2012, https://doi.org/10.5194/acpd-12-2863-2012, 2012
Revised manuscript has not been submitted (discussion: closed, 2 comments)
25 Jan 2012
Transport and outflow to the North Atlantic in the lower marine troposphere during ICARTT 2004
S. R. Davis, R. Talbot, and H. Mao
Atmos. Chem. Phys. Discuss., 12, 2395–2434, https://doi.org/10.5194/acpd-12-2395-2012, https://doi.org/10.5194/acpd-12-2395-2012, 2012
Revised manuscript not accepted (discussion: closed, 4 comments)
19 Jan 2012
Simulation of solar-cycle response in tropical total column ozone using SORCE irradiance
K.-F. Li, X. Jiang, M.-C. Liang, and Y. L. Yung
Atmos. Chem. Phys. Discuss., 12, 1867–1893, https://doi.org/10.5194/acpd-12-1867-2012, https://doi.org/10.5194/acpd-12-1867-2012, 2012
Revised manuscript not accepted (discussion: closed, 4 comments)
05 Jan 2012
Potential indirect effects of aerosol on tropical cyclone intensity: convective fluxes and cold-pool activity
G. M. Krall and W. R. Cottom
Atmos. Chem. Phys. Discuss., 12, 351–385, https://doi.org/10.5194/acpd-12-351-2012, https://doi.org/10.5194/acpd-12-351-2012, 2012
Revised manuscript not accepted (discussion: closed, 3 comments)
19 Dec 2011
Impact of cloud processes on aerosol particle properties: results from two ATR-42 flights in an extended stratocumulus cloud layer during the EUCAARI campaign (2008)
S. Crumeyrolle, R. Weigel, K. Sellegri, G. Roberts, L. Gomes, A. Stohl, P. Laj, T. Bourianne, J. M. Etcheberry, P. Villani, J. M. Pichon, and A. Schwarzenboeck
Atmos. Chem. Phys. Discuss., 11, 33229–33271, https://doi.org/10.5194/acpd-11-33229-2011, https://doi.org/10.5194/acpd-11-33229-2011, 2011
Revised manuscript not accepted (discussion: closed, 5 comments)
01 Dec 2011
Vertical mixing in the lower troposphere by mountain waves over Arctic Scandinavia
M. Mihalikova and S. Kirkwood
Atmos. Chem. Phys. Discuss., 11, 31475–31493, https://doi.org/10.5194/acpd-11-31475-2011, https://doi.org/10.5194/acpd-11-31475-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
25 Nov 2011
Satellite climatology of cloud liquid water path over the Southeast Pacific between 2002 and 2009
L. W. O'Neill, S. Wang, and Q. Jiang
Atmos. Chem. Phys. Discuss., 11, 31159–31206, https://doi.org/10.5194/acpd-11-31159-2011, https://doi.org/10.5194/acpd-11-31159-2011, 2011
Revised manuscript has not been submitted (discussion: closed, 3 comments)
24 Nov 2011
A new approach to estimate pollutant emissions based on trajectory modelling and its application in the North China Plain
W. Y. Xu, C. S. Zhao, P. F. Liu, L. Ran, N. Ma, Z. Z. Deng, W. L. Lin, P. Yan, and X. B. Xu
Atmos. Chem. Phys. Discuss., 11, 31137–31158, https://doi.org/10.5194/acpd-11-31137-2011, https://doi.org/10.5194/acpd-11-31137-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
18 Nov 2011
Amino acids in atmospheric droplets: perturbation of surface tension and critical supersaturation predicted by computer simulations
X. Li, T. Hede, Y. Tu, C. Leck, and H. Ågren
Atmos. Chem. Phys. Discuss., 11, 30919–30947, https://doi.org/10.5194/acpd-11-30919-2011, https://doi.org/10.5194/acpd-11-30919-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
14 Nov 2011
Improving PM2.5 retrievals in the San Joaquin Valley using A-Train Multi-Satellite Observations
A. W. Strawa, R. B. Chatfield, M. Legg, B. Scarnato, and R. Esswein
Atmos. Chem. Phys. Discuss., 11, 30563–30598, https://doi.org/10.5194/acpd-11-30563-2011, https://doi.org/10.5194/acpd-11-30563-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
08 Nov 2011
Uptake coefficient of H2O2 on ice
H. Yan and L. T. Chu
Atmos. Chem. Phys. Discuss., 11, 30091–30124, https://doi.org/10.5194/acpd-11-30091-2011, https://doi.org/10.5194/acpd-11-30091-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
31 Oct 2011
High resolution assimilation of IASI ozone data with a global CTM
B. Pajot, S. Massart, D. Cariolle, A. Piacentini, O. Pannekoucke, W. A. Lahoz, C. Clerbaux, P. F. Coheur, and D. Hurtmans
Atmos. Chem. Phys. Discuss., 11, 29357–29406, https://doi.org/10.5194/acpd-11-29357-2011, https://doi.org/10.5194/acpd-11-29357-2011, 2011
Revised manuscript has not been submitted (discussion: closed, 3 comments)
28 Oct 2011
The Morning NO x maximum in the forest atmosphere boundary layer
M. Alaghmand, P. B. Shepson, T. K. Starn, B. T. Jobson, H. W. Wallace, M. A. Carroll, S. B. Bertman, B. Lamb, S. L. Edburg, X. Zhou, E. Apel, D. Riemer, P. Stevens, and F. Keutsch
Atmos. Chem. Phys. Discuss., 11, 29251–29282, https://doi.org/10.5194/acpd-11-29251-2011, https://doi.org/10.5194/acpd-11-29251-2011, 2011
Revised manuscript has not been submitted (discussion: closed, 3 comments)
25 Oct 2011
Long-term simulations (2001–2006) of biomass burning and mineral dust optical properties over West Africa: comparisons with new satellite retrievals
F. Malavelle, M. Mallet, V. Pont, C. Liousse, and F. Solmon
Atmos. Chem. Phys. Discuss., 11, 28587–28626, https://doi.org/10.5194/acpd-11-28587-2011, https://doi.org/10.5194/acpd-11-28587-2011, 2011
Preprint withdrawn (discussion: closed, 4 comments)
24 Oct 2011
Importance of atmospheric aging in reactivity of mineral dust aerosol: a case study of heterogeneous reaction of gaseous hydrogen peroxide on processed mineral particles
Y. Zhao, Z. M. Chen, X. L. Shen, and D. Huang
Atmos. Chem. Phys. Discuss., 11, 28563–28586, https://doi.org/10.5194/acpd-11-28563-2011, https://doi.org/10.5194/acpd-11-28563-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
19 Oct 2011
Enhancement and depletion of lower/middle tropospheric ozone in Senegal during pre-monsoon and monsoon periods of summer 2008: observations and model results
G. S. Jenkins, S. Ndiaye, M. Gueye, R. Fitzhugh, J. W. Smith, and A. Kebe
Atmos. Chem. Phys. Discuss., 11, 28061–28095, https://doi.org/10.5194/acpd-11-28061-2011, https://doi.org/10.5194/acpd-11-28061-2011, 2011
Revised manuscript not accepted (discussion: closed, 6 comments)
12 Oct 2011
Indirect radiative forcing of aerosols via water vapor above non-precipitating maritime cumulus clouds
M. A. Pfeffer, J. E. Kristjansson, F. Stordal, T. Berntsen, and J. Fast
Atmos. Chem. Phys. Discuss., 11, 27637–27659, https://doi.org/10.5194/acpd-11-27637-2011, https://doi.org/10.5194/acpd-11-27637-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
06 Oct 2011
Unravelling airborne polycyclic aromatic hydrocarbons (PAHs) in southern China using tree-rings of 100-yr old Pinus Kwangtungensis
Y. W. Kuang, Z. H. Huang, D. Z. Wen, J. Li, and L. B. Huang
Atmos. Chem. Phys. Discuss., 11, 27359–27382, https://doi.org/10.5194/acpd-11-27359-2011, https://doi.org/10.5194/acpd-11-27359-2011, 2011
Preprint withdrawn (discussion: closed, 7 comments)
20 Sep 2011
Effect of the exclusion of crustal ions (Ca2+, Mg 2+, and K+) in estimating water content of PM2.5 at polluted and clean areas
Hyung-Min Lee and Yong Pyo Kim
Atmos. Chem. Phys. Discuss., 11, 26035–26056, https://doi.org/10.5194/acpd-11-26035-2011, https://doi.org/10.5194/acpd-11-26035-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
07 Sep 2011
Further analyses of the decadal-scale responses and trends in middle and upper stratospheric ozone from SAGE II and HALOE
E. E. Remsberg
Atmos. Chem. Phys. Discuss., 11, 25011–25036, https://doi.org/10.5194/acpd-11-25011-2011, https://doi.org/10.5194/acpd-11-25011-2011, 2011
Preprint withdrawn (discussion: closed, 3 comments)
17 Aug 2011
Hygroscopic behavior of individual NaNO3 particles
M.-J. Lee, H.-J. Jung, H.-J. Eom, S. Maskey, H. K. Kim, and C.-U. Ro
Atmos. Chem. Phys. Discuss., 11, 23203–23229, https://doi.org/10.5194/acpd-11-23203-2011, https://doi.org/10.5194/acpd-11-23203-2011, 2011
Preprint withdrawn (discussion: closed, 6 comments)
15 Aug 2011
Observed and model simulated 20th century Arctic temperature variability: Canadian Earth System Model CanESM2
P. Chylek, J. Li, M. K. Dubey, M. Wang, and G. Lesins
Atmos. Chem. Phys. Discuss., 11, 22893–22907, https://doi.org/10.5194/acpd-11-22893-2011, https://doi.org/10.5194/acpd-11-22893-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
05 Aug 2011
Ozone data assimilation with GEOS-Chem: a comparison between 3-D-Var, 4-D-Var, and suboptimal Kalman filter approaches
K. Singh, A. Sandu, K. W. Bowman, M. Parrington, D. B. A. Jones, and M. Lee
Atmos. Chem. Phys. Discuss., 11, 22247–22300, https://doi.org/10.5194/acpd-11-22247-2011, https://doi.org/10.5194/acpd-11-22247-2011, 2011
Revised manuscript not accepted (discussion: closed, 3 comments)
04 Aug 2011
Characteristics, sources and formation of aerosol oxalate in an Eastern Asia megacity and its implication to haze pollution
Y. Jiang, G. Zhuang, Q. Wang, T. Liu, K. Huang, J. S. Fu, J. Li, Y. Lin, R. Zhang, and C. Deng
Atmos. Chem. Phys. Discuss., 11, 22075–22112, https://doi.org/10.5194/acpd-11-22075-2011, https://doi.org/10.5194/acpd-11-22075-2011, 2011
Revised manuscript not accepted (discussion: closed, 5 comments)
02 Aug 2011
Variation of upper tropospheric clouds and water vapor over the Indian ocean
R. L. Bhawar, J. H. Jiang, and H. Su
Atmos. Chem. Phys. Discuss., 11, 21769–21787, https://doi.org/10.5194/acpd-11-21769-2011, https://doi.org/10.5194/acpd-11-21769-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
20 Jul 2011
Impact of continental outflow on chemistry of atmospheric aerosols over tropical Bay of Bengal
B. Srinivas, A. Kumar, M. M. Sarin, and A. K. Sudheer
Atmos. Chem. Phys. Discuss., 11, 20667–20711, https://doi.org/10.5194/acpd-11-20667-2011, https://doi.org/10.5194/acpd-11-20667-2011, 2011
Revised manuscript not accepted (discussion: closed, 7 comments)
15 Jul 2011
Reformulating the atmospheric lifecycle of SOA based on new field and laboratory data
M. Shrivastava, A. Zelenyuk, D. Imre, J. Beranek, R. Easter, R. A. Zaveri, and J. Fast
Atmos. Chem. Phys. Discuss., 11, 20107–20139, https://doi.org/10.5194/acpd-11-20107-2011, https://doi.org/10.5194/acpd-11-20107-2011, 2011
Revised manuscript not accepted (discussion: closed, 8 comments)
06 Jul 2011
Observing requirements for geostationary satellites to enable ozone air quality prediction
P. D. Hamer, K. W. Bowman, and D. K. Henze
Atmos. Chem. Phys. Discuss., 11, 19291–19355, https://doi.org/10.5194/acpd-11-19291-2011, https://doi.org/10.5194/acpd-11-19291-2011, 2011
Revised manuscript has not been submitted (discussion: closed, 3 comments)
10 Jun 2011
Sensing Hadley cell with space lidar
W. Sun and B. Lin
Atmos. Chem. Phys. Discuss., 11, 16599–16610, https://doi.org/10.5194/acpd-11-16599-2011, https://doi.org/10.5194/acpd-11-16599-2011, 2011
Revised manuscript has not been submitted (discussion: closed, 3 comments)
31 May 2011
Impact of deep convection on the tropical tropopause layer composition in Equatorial Brazil
V. Marécal, G. Krysztofiak, Y. Mébarki, V. Catoire, F. Lott, J.-L. Attié, J. Arteta, M. N. Deeter, S. R. Freitas, K. M. Longo, J.-B. Renard, and C. Robert
Atmos. Chem. Phys. Discuss., 11, 16147–16183, https://doi.org/10.5194/acpd-11-16147-2011, https://doi.org/10.5194/acpd-11-16147-2011, 2011
Revised manuscript has not been submitted (discussion: closed, 2 comments)
18 May 2011
Impact of nitrous acid chemistry on air quality modeling results over the Pearl River Delta region
R. Zhang, G. Sarwar, J. C. H. Fung, A. K. H. Lau, and Y. Zhang
Atmos. Chem. Phys. Discuss., 11, 15075–15117, https://doi.org/10.5194/acpd-11-15075-2011, https://doi.org/10.5194/acpd-11-15075-2011, 2011
Revised manuscript not accepted (discussion: closed, 6 comments)
13 May 2011
Characterization of gas station emissions during the CAREBeijing 2008 field study
J. Zheng, T. Zhu, R. Zhang, M. Wang, C.-C. Chang, M. Shao, and M. Hu
Atmos. Chem. Phys. Discuss., 11, 14719–14746, https://doi.org/10.5194/acpd-11-14719-2011, https://doi.org/10.5194/acpd-11-14719-2011, 2011
Revised manuscript has not been submitted (discussion: closed, 2 comments)
10 May 2011
Impact of dust aerosols on Hurricane Helene's early development through the deliquescent heterogeneous freezing mode
H. Zhang, I. N. Sokolik, and J. A. Curry
Atmos. Chem. Phys. Discuss., 11, 14339–14381, https://doi.org/10.5194/acpd-11-14339-2011, https://doi.org/10.5194/acpd-11-14339-2011, 2011
Revised manuscript not accepted (discussion: closed, 3 comments)
12 Apr 2011
Comparison of aerosol properties from the Indian Himalayas and the Indo-Gangetic plains
T. Raatikainen, A.-P. Hyvärinen, J. Hatakka, T. S. Panwar, R. K. Hooda, V. P. Sharma, and H. Lihavainen
Atmos. Chem. Phys. Discuss., 11, 11417–11453, https://doi.org/10.5194/acpd-11-11417-2011, https://doi.org/10.5194/acpd-11-11417-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
11 Apr 2011
Trajectory analysis on the origin of air mass and moisture associated with Atmospheric Rivers over the west coast of the United States
J.-M. Ryoo, D. E. Waliser, and E. J. Fetzer
Atmos. Chem. Phys. Discuss., 11, 11109–11142, https://doi.org/10.5194/acpd-11-11109-2011, https://doi.org/10.5194/acpd-11-11109-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
11 Apr 2011
Comparison of the size-resolved dust emission fluxes measured over a Sahelian source with the Dust Production Model DPM) predictions
M. Sow, S. C. Alfaro, and J. L. Rajot
Atmos. Chem. Phys. Discuss., 11, 11077–11107, https://doi.org/10.5194/acpd-11-11077-2011, https://doi.org/10.5194/acpd-11-11077-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
05 Apr 2011
Initiation of coalescence in a cumulus cloud: a beneficial influence of entrainment and mixing
W. A. Cooper, S. G. Lasher-Trapp, and A. M. Blyth
Atmos. Chem. Phys. Discuss., 11, 10557–10613, https://doi.org/10.5194/acpd-11-10557-2011, https://doi.org/10.5194/acpd-11-10557-2011, 2011
Revised manuscript not accepted (discussion: closed, 3 comments)
04 Apr 2011
Study on long-term aerosol distribution over the land of East China using MODIS data
Q. He, C. Li, F. Geng, Y. Lei, Y. Li, X. Tie, and Q. Yin
Atmos. Chem. Phys. Discuss., 11, 10485–10523, https://doi.org/10.5194/acpd-11-10485-2011, https://doi.org/10.5194/acpd-11-10485-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
30 Mar 2011
Acyl peroxy nitrate measurements during the photochemical smog season in Beijing, China
Z. Xu, J. Zhang, G. Yang, and M. Hu
Atmos. Chem. Phys. Discuss., 11, 10265–10303, https://doi.org/10.5194/acpd-11-10265-2011, https://doi.org/10.5194/acpd-11-10265-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
22 Mar 2011
A statistical subgrid-scale algorithm for precipitation formation in stratiform clouds in the ECHAM5 single column model
S. Jess, P. Spichtinger, and U. Lohmann
Atmos. Chem. Phys. Discuss., 11, 9335–9374, https://doi.org/10.5194/acpd-11-9335-2011, https://doi.org/10.5194/acpd-11-9335-2011, 2011
Preprint withdrawn (discussion: closed, 4 comments)
10 Mar 2011
Peroxyacetyl nitrate (PAN) and peroxypropionyl nitrate (PPN) in urban and suburban atmospheres of Beijing, China
J. B. Zhang, Z. Xu, G. Yang, and B. Wang
Atmos. Chem. Phys. Discuss., 11, 8173–8206, https://doi.org/10.5194/acpd-11-8173-2011, https://doi.org/10.5194/acpd-11-8173-2011, 2011
Revised manuscript not accepted (discussion: closed, 9 comments)
09 Mar 2011
Evaluation of satellite-derived HCHO using statistical methods
J. H. Kim, S. M. Kim, K. H. Baek, L. Wang, T. Kurosu, I. De Smedt, K. Chance, and M. J. Newchurch
Atmos. Chem. Phys. Discuss., 11, 8003–8025, https://doi.org/10.5194/acpd-11-8003-2011, https://doi.org/10.5194/acpd-11-8003-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
02 Mar 2011
Enhancement and depletion of lower/middle tropospheric ozone in Senegal during pre-monsoon and monsoon periods of summer 2008: observations and model results
G. S. Jenkins, S. Ndiaye, M. Gueye, R. Fitzhugh, J. W. Smith, and A. Kebe
Atmos. Chem. Phys. Discuss., 11, 7155–7187, https://doi.org/10.5194/acpd-11-7155-2011, https://doi.org/10.5194/acpd-11-7155-2011, 2011
Revised manuscript not accepted (discussion: closed, 3 comments)
25 Feb 2011
Modelling the impacts of climate change on tropospheric ozone over three centuries
G. B. Hedegaard, A. Gross, J. H. Christensen, W. May, H. Skov, C. Geels, K. M. Hansen, and J. Brandt
Atmos. Chem. Phys. Discuss., 11, 6805–6843, https://doi.org/10.5194/acpd-11-6805-2011, https://doi.org/10.5194/acpd-11-6805-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
22 Feb 2011
Optical properties of elemental carbon and water-soluble organic carbon in Beijing, China
Y. Cheng, K.-B. He, M. Zheng, F.-K. Duan, Y.-L. Ma, Z.-Y. Du, J.-H. Tan, J.-M. Liu, X.-L. Zhang, R. J. Weber, M. H. Bergin, and A. G. Russell
Atmos. Chem. Phys. Discuss., 11, 6221–6258, https://doi.org/10.5194/acpd-11-6221-2011, https://doi.org/10.5194/acpd-11-6221-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
21 Feb 2011
Source contributions to Northern Hemisphere CO and black carbon during spring and summer 2008 from POLARCAT and START08/preHIPPO observations and MOZART-4
S. Tilmes, L. K. Emmons, K. S. Law, G. Ancellet, H. Schlager, J.-D. Paris, H. E. Fuelberg, D. G. Streets, C. Wiedinmyer, G. S. Diskin, Y. Kondo, J. Holloway, J. P. Schwarz, J. R. Spackman, T. Campos, P. Nédélec, and M. V. Panchenko
Atmos. Chem. Phys. Discuss., 11, 5935–5983, https://doi.org/10.5194/acpd-11-5935-2011, https://doi.org/10.5194/acpd-11-5935-2011, 2011
Revised manuscript not accepted (discussion: closed, 3 comments)
09 Feb 2011
The DAURE field campaign: meteorological overview
O. Jorba, M. Pandolfi, M. Spada, J. M. Baldasano, J. Pey, A. Alastuey, D. Arnold, M. Sicard, B. Artiñano, M. A. Revuelta, and X. Querol
Atmos. Chem. Phys. Discuss., 11, 4953–5001, https://doi.org/10.5194/acpd-11-4953-2011, https://doi.org/10.5194/acpd-11-4953-2011, 2011
Preprint withdrawn (discussion: closed, 5 comments)
04 Feb 2011
Continuous observations of synoptic-scale dust transport at the Nepal Climate Observatory-Pyramid (5079 m a.s.l.) in the Himalayas
R. Duchi, P. Cristofanelli, A. Marinoni, P. Laj, S. Marcq, P. Villani, K. Sellegri, F. Angelini, F. Calzolari, G. P. Gobbi, G. P. Verza, E. Vuillermoz, A. Sapkota, and P. Bonasoni
Atmos. Chem. Phys. Discuss., 11, 4229–4261, https://doi.org/10.5194/acpd-11-4229-2011, https://doi.org/10.5194/acpd-11-4229-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
04 Feb 2011
The effect of ENSO activity on lower stratospheric water vapor
F. Xie, W. Tian, J. Austin, J. Li, H. Tian, J. Shu, and C. Chen
Atmos. Chem. Phys. Discuss., 11, 4141–4166, https://doi.org/10.5194/acpd-11-4141-2011, https://doi.org/10.5194/acpd-11-4141-2011, 2011
Revised manuscript not accepted (discussion: closed, 5 comments)
28 Jan 2011
Seasonal variation of trans-Pacific transport of carbon monoxide (CO) in the upper troposphere: MLS observations and GEOS-Chem and GEM-AQ simulations
J. J. Jin, N. J. Livesey, J. H. Jiang, A. Lupu, J. W. Kaminski, and J. C. McConnell
Atmos. Chem. Phys. Discuss., 11, 3219–3250, https://doi.org/10.5194/acpd-11-3219-2011, https://doi.org/10.5194/acpd-11-3219-2011, 2011
Revised manuscript has not been submitted (discussion: closed, 2 comments)
28 Jan 2011
A regional chemical transport modeling to identify the influences of biomass burning during 2006 BASE-ASIA
J. S. Fu, N. C. Hsu, Y. Gao, K. Huang, C. Li, N.-H. Lin, and S.-C. Tsay
Atmos. Chem. Phys. Discuss., 11, 3071–3115, https://doi.org/10.5194/acpd-11-3071-2011, https://doi.org/10.5194/acpd-11-3071-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
25 Jan 2011
High solubility of SO2: evidence in an intensive fog event measured in the NCP region, China
Q. Zhang and X. Tie
Atmos. Chem. Phys. Discuss., 11, 2931–2947, https://doi.org/10.5194/acpd-11-2931-2011, https://doi.org/10.5194/acpd-11-2931-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
20 Jan 2011
Absorption, scattering and single scattering albedo of aerosols obtained from in situ measurements in the subarctic coastal region of Norway
E. Montilla, S. Mogo, V. Cachorro, J. Lopez, and A. de Frutos
Atmos. Chem. Phys. Discuss., 11, 2161–2182, https://doi.org/10.5194/acpd-11-2161-2011, https://doi.org/10.5194/acpd-11-2161-2011, 2011
Revised manuscript not accepted (discussion: closed, 4 comments)
20 Jan 2011
Explicit cloud-top entrainment parameterization in the global climate model ECHAM5-HAM
C. Siegenthaler-Le Drian, P. Spichtinger, and U. Lohmann
Atmos. Chem. Phys. Discuss., 11, 1971–2023, https://doi.org/10.5194/acpd-11-1971-2011, https://doi.org/10.5194/acpd-11-1971-2011, 2011
Revised manuscript has not been submitted (discussion: closed, 2 comments)
19 Jan 2011
Elevated aerosol layer embedded with aged soot particles in a polluted urban atmosphere
G. Shi, D. Zhang, B. Wang, B. Chen, M. Yamada, and H. Niu
Atmos. Chem. Phys. Discuss., 11, 1641–1669, https://doi.org/10.5194/acpd-11-1641-2011, https://doi.org/10.5194/acpd-11-1641-2011, 2011
Revised manuscript not accepted (discussion: closed, 5 comments)
11 Jan 2011
Ancient versus modern mineral dust transported to high-altitude alpine glaciers evidences saharan sources and atmospheric circulation changes
F. Thevenon, M. Chiaradia, T. Adatte, C. Hueglin, and J. Poté
Atmos. Chem. Phys. Discuss., 11, 859–884, https://doi.org/10.5194/acpd-11-859-2011, https://doi.org/10.5194/acpd-11-859-2011, 2011
Preprint withdrawn (discussion: closed, 6 comments)
07 Jan 2011
Wind speed dependent size-resolved parameterization for the organic enrichment of sea spray
B. Gantt and N. Meskhidze
Atmos. Chem. Phys. Discuss., 11, 425–452, https://doi.org/10.5194/acpd-11-425-2011, https://doi.org/10.5194/acpd-11-425-2011, 2011
Preprint withdrawn (discussion: closed, 1 comment)
23 Dec 2010
Effects of particle shape, hematite content and semi-external mixing with carbonaceous components on the optical properties of accumulation mode mineral dust
S. K. Mishra, S. N. Tripathi, S. G. Aggarwal, and A. Arola
Atmos. Chem. Phys. Discuss., 10, 31253–31300, https://doi.org/10.5194/acpd-10-31253-2010, https://doi.org/10.5194/acpd-10-31253-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
17 Dec 2010
Global and regional trends in aerosol optical depth based on remote sensing products and pollutant emission estimates between 2000 and 2009
A. de Meij, A. Pozzer, and J. Lelieveld
Atmos. Chem. Phys. Discuss., 10, 30731–30776, https://doi.org/10.5194/acpd-10-30731-2010, https://doi.org/10.5194/acpd-10-30731-2010, 2010
Revised manuscript not accepted (discussion: closed, 8 comments)
13 Dec 2010
A minimum bulk microphysics
J.-I. Yano and D. Bouniol
Atmos. Chem. Phys. Discuss., 10, 30305–30345, https://doi.org/10.5194/acpd-10-30305-2010, https://doi.org/10.5194/acpd-10-30305-2010, 2010
Revised manuscript not accepted (discussion: closed, 3 comments)
09 Dec 2010
Enhancements of gravity wave amplitudes at midlatitudes during sudden stratospheric warmings in 2008
T. Flury, K. Hocke, N. Kämpfer, and D. L. Wu
Atmos. Chem. Phys. Discuss., 10, 29971–29995, https://doi.org/10.5194/acpd-10-29971-2010, https://doi.org/10.5194/acpd-10-29971-2010, 2010
Revised manuscript has not been submitted (discussion: closed, 5 comments)
25 Nov 2010
Atmospheric homogeneous nucleation of H2SO4 and H2O
D. R. Benson, M. E. Erupe, J. H. Yu, A. Markovich, and S.-H. Lee
Atmos. Chem. Phys. Discuss., 10, 29051–29073, https://doi.org/10.5194/acpd-10-29051-2010, https://doi.org/10.5194/acpd-10-29051-2010, 2010
Revised manuscript not accepted (discussion: closed, 12 comments)
23 Nov 2010
Temperature thresholds for polar stratospheric ozone loss
K. Drdla and R. Müller
Atmos. Chem. Phys. Discuss., 10, 28687–28720, https://doi.org/10.5194/acpd-10-28687-2010, https://doi.org/10.5194/acpd-10-28687-2010, 2010
Revised manuscript not accepted (discussion: closed, 6 comments)
17 Nov 2010
The impact of different nitrous acid sources in the air quality levels of the Iberian Peninsula
M. Gonçalves, D. Dabdub, W. L. Chang, F. Saiz, O. Jorba, and J. M. Baldasano
Atmos. Chem. Phys. Discuss., 10, 28183–28230, https://doi.org/10.5194/acpd-10-28183-2010, https://doi.org/10.5194/acpd-10-28183-2010, 2010
Revised manuscript not accepted (discussion: closed, 9 comments)
12 Nov 2010
Annual variation of methane emissions from forested bogs in West Siberia (2005–2009): a case of high CH4 and precipitation rate in the summer of 2007
M. Sasakawa, A. Ito, T. Machida, N. Tsuda, Y. Niwa, D. Davydov, A. Fofonov, and M. Arshinov
Atmos. Chem. Phys. Discuss., 10, 27759–27776, https://doi.org/10.5194/acpd-10-27759-2010, https://doi.org/10.5194/acpd-10-27759-2010, 2010
Revised manuscript not accepted (discussion: closed, 10 comments)
19 Oct 2010
A theoretical study on UV-spectroscopy, electronic structure and reactivity properties of sesquiterpenes
S.-X. Hu, J.-G. Yu, and E. Y. Zeng
Atmos. Chem. Phys. Discuss., 10, 24325–24343, https://doi.org/10.5194/acpd-10-24325-2010, https://doi.org/10.5194/acpd-10-24325-2010, 2010
Revised manuscript not accepted (discussion: closed, 5 comments)
12 Oct 2010
A simplified empirical method for determination of aerosol hygroscopicity and composition
C. H. Chan, A. Y. S. Cheng, and A. Viseu
Atmos. Chem. Phys. Discuss., 10, 23627–23656, https://doi.org/10.5194/acpd-10-23627-2010, https://doi.org/10.5194/acpd-10-23627-2010, 2010
Revised manuscript has not been submitted (discussion: closed, 3 comments)
11 Oct 2010
Simulation of the aerosol effect on the microphysical properties of shallow stratocumulus clouds over East Asia using a bin-based meso-scale cloud model
I.-J. Choi, T. Iguchi, S.-W. Kim, S.-C. Yoon, and T. Nakajima
Atmos. Chem. Phys. Discuss., 10, 23449–23495, https://doi.org/10.5194/acpd-10-23449-2010, https://doi.org/10.5194/acpd-10-23449-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
29 Sep 2010
A theoretical study of abiotic methylation reactions of gaseous elemental mercury by halogen containing molecules
L. Castro, A. Dommergue, C. Larose, C. Ferrari, and L. Maron
Atmos. Chem. Phys. Discuss., 10, 22369–22394, https://doi.org/10.5194/acpd-10-22369-2010, https://doi.org/10.5194/acpd-10-22369-2010, 2010
Preprint withdrawn (discussion: closed, 0 comments)
28 Sep 2010
Measurements of tropospheric HO2 and RO2 by oxygen dilution modulation and chemical ionization mass spectrometry
R. S. Hornbrook, J. H. Crawford, G. D. Edwards, O. Goyea, R. L. Mauldin III, J. S. Olson, and C. A. Cantrell
Atmos. Chem. Phys. Discuss., 10, 22219–22277, https://doi.org/10.5194/acpd-10-22219-2010, https://doi.org/10.5194/acpd-10-22219-2010, 2010
Preprint withdrawn (discussion: closed, 3 comments)
17 Sep 2010
Effects of ship wakes on ocean brightness and radiative forcing over ocean
C. K. Gatebe, R. Poudyal, E. Wilcox, and J. Wang
Atmos. Chem. Phys. Discuss., 10, 21683–21696, https://doi.org/10.5194/acpd-10-21683-2010, https://doi.org/10.5194/acpd-10-21683-2010, 2010
Revised manuscript not accepted (discussion: closed, 3 comments)
02 Sep 2010
Total cloud cover from satellite observations and climate models
P. Probst, R. Rizzi, E. Tosi, V. Lucarini, and T. Maestri
Atmos. Chem. Phys. Discuss., 10, 21023–21046, https://doi.org/10.5194/acpd-10-21023-2010, https://doi.org/10.5194/acpd-10-21023-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
31 Aug 2010
Aerosol direct radiative forcing during Sahara dust intrusions in the Central Mediterranean
M. R. Perrone, A. Bergamo, and V. Bellantone
Atmos. Chem. Phys. Discuss., 10, 20673–20727, https://doi.org/10.5194/acpd-10-20673-2010, https://doi.org/10.5194/acpd-10-20673-2010, 2010
Revised manuscript has not been submitted (discussion: closed, 3 comments)
27 Aug 2010
Investigating the sensitivity of high-resolution mesoscale models to microphysical parameters by the use of polarimetric radar observations
R. Ferretti, K. De Sanctis, L. Molini, A. Parodi, M. Montopoli, F. S. Marzano, and F. Siccardi
Atmos. Chem. Phys. Discuss., 10, 20461–20514, https://doi.org/10.5194/acpd-10-20461-2010, https://doi.org/10.5194/acpd-10-20461-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
25 Aug 2010
Ancient versus modern mineral dust transported to high-altitude Alpine glaciers evidences Saharan sources and atmospheric circulation changes
F. Thevenon, M. Chiaradia, T. Adatte, C. Hueglin, and J. Poté
Atmos. Chem. Phys. Discuss., 10, 20167–20191, https://doi.org/10.5194/acpd-10-20167-2010, https://doi.org/10.5194/acpd-10-20167-2010, 2010
Preprint withdrawn (discussion: closed, 0 comments)
24 Aug 2010
Modelling day-time concentrations of biogenic volatile organic compounds in a boreal forest canopy
H. K. Lappalainen, S. Sevanto, M. Dal Maso, R. Taipale, M. K. Kajos, and J. Bäck
Atmos. Chem. Phys. Discuss., 10, 20035–20068, https://doi.org/10.5194/acpd-10-20035-2010, https://doi.org/10.5194/acpd-10-20035-2010, 2010
Preprint withdrawn (discussion: closed, 4 comments)
24 Aug 2010
Technical Note: Methods for interval constrained atmospheric inversion of methane
J. Tang and Q. Zhuang
Atmos. Chem. Phys. Discuss., 10, 19981–20004, https://doi.org/10.5194/acpd-10-19981-2010, https://doi.org/10.5194/acpd-10-19981-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
23 Aug 2010
Ambient concentrations of aldehydes in relation to Beijing Olympic air pollution control measures
J. C. Gong, T. Zhu, M. Hu, L. W. Zhang, H. Cheng, L. Zhang, J. Tong, and J. Zhang
Atmos. Chem. Phys. Discuss., 10, 19737–19761, https://doi.org/10.5194/acpd-10-19737-2010, https://doi.org/10.5194/acpd-10-19737-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
13 Aug 2010
A meridional structure of static stability and ozone vertical gradient around the tropopause in the Southern Hemisphere extratropics
Y. Tomikawa and T. Yamanouchi
Atmos. Chem. Phys. Discuss., 10, 19175–19194, https://doi.org/10.5194/acpd-10-19175-2010, https://doi.org/10.5194/acpd-10-19175-2010, 2010
Revised manuscript not accepted (discussion: closed, 5 comments)
20 Jul 2010
Size-resolved particulate water-soluble organic compounds in the urban, mountain and marine atmosphere
G. Wang, K. Kawamura, M. Xie, S. Hu, B. Zhou, J. Li, J. Cao, and Z. An
Atmos. Chem. Phys. Discuss., 10, 17467–17490, https://doi.org/10.5194/acpd-10-17467-2010, https://doi.org/10.5194/acpd-10-17467-2010, 2010
Revised manuscript not accepted (discussion: closed, 3 comments)
09 Jul 2010
Suppression of warm rain by aerosols in rain-shadow areas of India
M. Konwar, R. S. Maheskumar, J. R. Kulkarni, E. Freud, B. N. Goswami, and D. Rosenfeld
Atmos. Chem. Phys. Discuss., 10, 17009–17027, https://doi.org/10.5194/acpd-10-17009-2010, https://doi.org/10.5194/acpd-10-17009-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
10 Jun 2010
Spatial features of rain frequency change induced by pollution and associated aerosols
Yanfen Lin, Qilong Min, Guoshun Zhuang, Zuwu Wang, Wei Gong, and Rui Li
Atmos. Chem. Phys. Discuss., 10, 14495–14511, https://doi.org/10.5194/acpd-10-14495-2010, https://doi.org/10.5194/acpd-10-14495-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
09 Jun 2010
Components of near-surface energy balance derived from satellite soundings – Part 2: Latent heat flux
K. Mallick, A. Jarvis, G. Wohlfahrt, C. Gough, T. Hirano, G. Kiely, A. Miyata, and S. Yamamoto
Atmos. Chem. Phys. Discuss., 10, 14417–14443, https://doi.org/10.5194/acpd-10-14417-2010, https://doi.org/10.5194/acpd-10-14417-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
09 Jun 2010
Components of near-surface energy balance derived from satellite soundings – Part 1: Net available energy
A. Jarvis, K. Mallick, G. Wohlfahrt, C. Gough, T. Hirano, G. Kiely, A. Miyata, and S. Yamamoto
Atmos. Chem. Phys. Discuss., 10, 14387–14415, https://doi.org/10.5194/acpd-10-14387-2010, https://doi.org/10.5194/acpd-10-14387-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
19 May 2010
Detailed cloud resolving model simulations of the impacts of Saharan air layer dust on tropical deep convection – Part 1: Dust acts as ice nuclei
W. Gong, Q. Min, R. Li, A. Teller, E. Joseph, and V. Morris
Atmos. Chem. Phys. Discuss., 10, 12907–12952, https://doi.org/10.5194/acpd-10-12907-2010, https://doi.org/10.5194/acpd-10-12907-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
26 Apr 2010
Probabilistic model of shattering effect on in-cloud measurements
V. Shcherbakov, J.-F. Gayet, G. Febvre, A. J. Heymsfield, and G. Mioche
Atmos. Chem. Phys. Discuss., 10, 11009–11045, https://doi.org/10.5194/acpd-10-11009-2010, https://doi.org/10.5194/acpd-10-11009-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
20 Apr 2010
Enhancement of the volcanogenic "bromine explosion" via reactive nitrogen chemistry (Kīlauea volcano, Hawai'i)
G. G. Salerno, C. Oppenheimer, V. I. Tsanev, A. J. Sutton, T. J. Roberts, and T. Elias
Atmos. Chem. Phys. Discuss., 10, 10313–10334, https://doi.org/10.5194/acpd-10-10313-2010, https://doi.org/10.5194/acpd-10-10313-2010, 2010
Revised manuscript has not been submitted (discussion: closed, 3 comments)
16 Apr 2010
Chemical transformations of Hg° during Arctic mercury depletion events sampled from the NASA DC-8
S. Y. Kim, R. Talbot, H. Mao, D. R. Blake, G. Huey, and A. J. Weinheimer
Atmos. Chem. Phys. Discuss., 10, 10077–10112, https://doi.org/10.5194/acpd-10-10077-2010, https://doi.org/10.5194/acpd-10-10077-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
14 Apr 2010
Composition and sources of particulate matter in an industrialised Alpine valley
N. Perron, J. Sandradewi, M. R. Alfarra, P. Lienemann, R. Gehrig, A. Kasper-Giebl, V. A. Lanz, S. Szidat, M. Ruff, S. Fahrni, L. Wacker, U. Baltensperger, and A. S. H. Prévôt
Atmos. Chem. Phys. Discuss., 10, 9391–9430, https://doi.org/10.5194/acpd-10-9391-2010, https://doi.org/10.5194/acpd-10-9391-2010, 2010
Revised manuscript has not been submitted (discussion: closed, 3 comments)
07 Apr 2010
A comprehensive characterisation of Asian dust storm particles: chemical composition, reactivity to SO2, and hygroscopic property
Q. Ma, Y. Liu, C. Liu, J. Ma, and H. He
Atmos. Chem. Phys. Discuss., 10, 8899–8925, https://doi.org/10.5194/acpd-10-8899-2010, https://doi.org/10.5194/acpd-10-8899-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
01 Apr 2010
Aerosol dynamics in the Copenhagen urban plume during regional transport
F. Wang, P. Roldin, A. Massling, A. Kristensson, E. Swietlicki, D. Fang, and M. Ketzel
Atmos. Chem. Phys. Discuss., 10, 8553–8594, https://doi.org/10.5194/acpd-10-8553-2010, https://doi.org/10.5194/acpd-10-8553-2010, 2010
Revised manuscript has not been submitted (discussion: closed, 3 comments)
29 Mar 2010
Derivation of the stoichiometric coefficient of water (νw) to account for water uptake by atmospheric aerosols
S. Metzger, B. Steil, J. E. Penner, L. Xu, and J. Lelieveld
Atmos. Chem. Phys. Discuss., 10, 8165–8188, https://doi.org/10.5194/acpd-10-8165-2010, https://doi.org/10.5194/acpd-10-8165-2010, 2010
Revised manuscript has not been submitted (discussion: closed, 7 comments)
23 Mar 2010
Why anisotropic turbulence matters: another reply
S. Lovejoy, D. Schertzer, and A. F. Tuck
Atmos. Chem. Phys. Discuss., 10, 7495–7506, https://doi.org/10.5194/acpd-10-7495-2010, https://doi.org/10.5194/acpd-10-7495-2010, 2010
Revised manuscript not accepted (discussion: closed, 6 comments)
11 Mar 2010
Isotope modeling of nitric acid formation in the atmosphere using ISO-RACM: testing the importance of NO oxidation, heterogeneous reactions, and trace gas chemistry
G. Michalski and F. Xu
Atmos. Chem. Phys. Discuss., 10, 6829–6869, https://doi.org/10.5194/acpd-10-6829-2010, https://doi.org/10.5194/acpd-10-6829-2010, 2010
Revised manuscript has not been submitted (discussion: closed, 4 comments)
08 Mar 2010
Aerosol effects on deep convective clouds: impact of changes in aerosol size distribution and aerosol activation parameterization
A. M. L. Ekman, A. Engström, and A. Söderberg
Atmos. Chem. Phys. Discuss., 10, 6341–6374, https://doi.org/10.5194/acpd-10-6341-2010, https://doi.org/10.5194/acpd-10-6341-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
23 Feb 2010
A modelling study of air quality impact of odd-even day traffic restriction scheme before, during and after the 2008 Beijing Olympic Games
H. Cai and S. D. Xie
Atmos. Chem. Phys. Discuss., 10, 5135–5184, https://doi.org/10.5194/acpd-10-5135-2010, https://doi.org/10.5194/acpd-10-5135-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
05 Feb 2010
Impacts of dust on West African climate during 2005 and 2006
M. Camara, G. Jenkins, and A. Konare
Atmos. Chem. Phys. Discuss., 10, 3053–3086, https://doi.org/10.5194/acpd-10-3053-2010, https://doi.org/10.5194/acpd-10-3053-2010, 2010
Revised manuscript not accepted (discussion: closed, 4 comments)
03 Feb 2010
Long-term trends in the middle atmosphere dynamics at northern middle latitudes – one regime or two different regimes?
J. Lastovicka, P. Krizan, and M. Kozubek
Atmos. Chem. Phys. Discuss., 10, 2633–2668, https://doi.org/10.5194/acpd-10-2633-2010, https://doi.org/10.5194/acpd-10-2633-2010, 2010
Revised manuscript not accepted (discussion: closed, 3 comments)
25 Jan 2010
The basic mechanism behind the hurricane-free warm tropical ocean
Z. Yuan, Y.-K. Qian, J. Wu, and J. Qi
Atmos. Chem. Phys. Discuss., 10, 1957–1982, https://doi.org/10.5194/acpd-10-1957-2010, https://doi.org/10.5194/acpd-10-1957-2010, 2010
Revised manuscript not accepted (discussion: closed, 9 comments)
20 Jan 2010
Cluster analysis of midlatitude oceanic cloud regimes – Part 2: Temperature sensitivity of cloud properties
N. D. Gordon and J. R. Norris
Atmos. Chem. Phys. Discuss., 10, 1595–1629, https://doi.org/10.5194/acpd-10-1595-2010, https://doi.org/10.5194/acpd-10-1595-2010, 2010
Revised manuscript has not been submitted (discussion: closed, 6 comments)
07 Jan 2010
Laboratory experiments on the effect of organic acids and metals on the charge transfer during ice crystal – graupel collision under the conditions similar to stratiform clouds
P. Jish Prakash and P. Pradeep Kumar
Atmos. Chem. Phys. Discuss., 10, 245–280, https://doi.org/10.5194/acpd-10-245-2010, https://doi.org/10.5194/acpd-10-245-2010, 2010
Revised manuscript has not been submitted (discussion: closed, 0 comments)
16 Dec 2009
Nitrogen oxide chemistry in an urban plume: investigation of the chemistry of peroxy and multifunctional organic nitrates with a Lagrangian model
I. M. Pérez, B. W. LaFranchi, and R. C. Cohen
Atmos. Chem. Phys. Discuss., 9, 27099–27165, https://doi.org/10.5194/acpd-9-27099-2009, https://doi.org/10.5194/acpd-9-27099-2009, 2009
Revised manuscript has not been submitted (discussion: closed, 4 comments)
15 Dec 2009
Cirrus cloud radiative effect on surface-level shortwave and longwave irradiances at regional and global scale
J.-C. Dupont, M. Haeffelin, and C. N. Long
Atmos. Chem. Phys. Discuss., 9, 26777–26832, https://doi.org/10.5194/acpd-9-26777-2009, https://doi.org/10.5194/acpd-9-26777-2009, 2009
Revised manuscript not accepted (discussion: closed, 4 comments)
25 Nov 2009
Heavy ozone enrichments from MIPAS limb emission spectra
C. Piccolo, A. Dudhia, and V. H. Payne
Atmos. Chem. Phys. Discuss., 9, 25127–25158, https://doi.org/10.5194/acpd-9-25127-2009, https://doi.org/10.5194/acpd-9-25127-2009, 2009
Revised manuscript has not been submitted (discussion: closed, 3 comments)
11 Nov 2009
Impact of solar radiation on aerosol-cloud interactions in thin stratocumulus clouds
S. S. Lee and J. E. Penner
Atmos. Chem. Phys. Discuss., 9, 23791–23833, https://doi.org/10.5194/acpd-9-23791-2009, https://doi.org/10.5194/acpd-9-23791-2009, 2009
Revised manuscript not accepted (discussion: closed, 4 comments)
09 Nov 2009
Technical Note: Detection and identification of radical species formed from α-pinene/ozone reaction using DMPO spin trap
J. Pavlovic and P. K. Hopke
Atmos. Chem. Phys. Discuss., 9, 23695–23717, https://doi.org/10.5194/acpd-9-23695-2009, https://doi.org/10.5194/acpd-9-23695-2009, 2009
Revised manuscript not accepted (discussion: closed, 6 comments)
09 Nov 2009
Interpretation of Aura satellite observations of CO and aerosol index related to the December 2006 Australia fires
M. Luo, C. Boxe, J. Jiang, R. Nassar, and N. Livesey
Atmos. Chem. Phys. Discuss., 9, 23665–23693, https://doi.org/10.5194/acpd-9-23665-2009, https://doi.org/10.5194/acpd-9-23665-2009, 2009
Preprint withdrawn (discussion: closed, 6 comments)
27 Oct 2009
Bimodal variation in mercury wet deposition to the coastal zone of the southern Baltic
P. Siudek, L. Falkowska, and A. Urba
Atmos. Chem. Phys. Discuss., 9, 22773–22801, https://doi.org/10.5194/acpd-9-22773-2009, https://doi.org/10.5194/acpd-9-22773-2009, 2009
Revised manuscript not accepted (discussion: closed, 6 comments)
23 Oct 2009
Aerosol direct radiative forcing during Sahara dust intrusions in the central Mediterranean
M. R. Perrone, A. Bergamo, and V. Bellantone
Atmos. Chem. Phys. Discuss., 9, 22539–22579, https://doi.org/10.5194/acpd-9-22539-2009, https://doi.org/10.5194/acpd-9-22539-2009, 2009
Revised manuscript not accepted (discussion: closed, 5 comments)
20 Oct 2009
Atmospheric electric field anomalies associated with solar flare/coronal mass ejection events and solar energetic charged particle "Ground Level Events"
E. A. Kasatkina, O. I. Shumilov, M. J. Rycroft, F. Marcz, and A. V. Frank-Kamenetsky
Atmos. Chem. Phys. Discuss., 9, 21941–21958, https://doi.org/10.5194/acpd-9-21941-2009, https://doi.org/10.5194/acpd-9-21941-2009, 2009
Revised manuscript not accepted (discussion: closed, 10 comments)
19 Oct 2009
Source apportionment of mercury in dust fallout at urban residential area of Central India
S. Pervez, G. Balakrishna, and S. Tiwari
Atmos. Chem. Phys. Discuss., 9, 21915–21940, https://doi.org/10.5194/acpd-9-21915-2009, https://doi.org/10.5194/acpd-9-21915-2009, 2009
Revised manuscript not accepted (discussion: closed, 6 comments)
17 Sep 2009
Factors determining the effect of aerosols on cloud mass and the dependence of these factors on liquid-water path
S. S. Lee and J. E. Penner
Atmos. Chem. Phys. Discuss., 9, 19313–19350, https://doi.org/10.5194/acpd-9-19313-2009, https://doi.org/10.5194/acpd-9-19313-2009, 2009
Revised manuscript not accepted (discussion: closed, 6 comments)
10 Sep 2009
Peroxy radicals and ozone photochemistry in air masses undergoing long-range transport
A. E. Parker, P. S. Monks, M. J. Jacob, S. A. Penkett, A. C. Lewis, D. J. Stewart, L. K. Whalley, J. Methven, and A. Stohl
Atmos. Chem. Phys. Discuss., 9, 18793–18838, https://doi.org/10.5194/acpd-9-18793-2009, https://doi.org/10.5194/acpd-9-18793-2009, 2009
Revised manuscript not accepted (discussion: closed, 4 comments)
10 Sep 2009
Regional-scale correlation between CO2 fire emissions, burned areas, and mid-tropospheric CO2 daily variations over southern Africa
A. Chédin, N. A. Scott, P. Ciais, C. Rio, F. Hourdin, C. Crevoisier, and R. Armante
Atmos. Chem. Phys. Discuss., 9, 18621–18657, https://doi.org/10.5194/acpd-9-18621-2009, https://doi.org/10.5194/acpd-9-18621-2009, 2009
Revised manuscript not accepted (discussion: closed, 5 comments)
01 Sep 2009
Influence of aerosols on the formation and development of radiation fog
J. Rangognio, P. Tulet, T. Bergot, L. Gomes, O. Thouron, and M. Leriche
Atmos. Chem. Phys. Discuss., 9, 17963–18019, https://doi.org/10.5194/acpd-9-17963-2009, https://doi.org/10.5194/acpd-9-17963-2009, 2009
Revised manuscript has not been submitted (discussion: closed, 3 comments)
10 Aug 2009
Summertime contributions of isoprene, monoterpenes, and sesquiterpene oxidation to the formation of secondary organic aerosol in the troposphere over Mt. Tai, Central East China during MTX2006
P. Q. Fu, K. Kawamura, P. Pochanart, H. Tanimoto, Y. Kanaya, and Z. F. Wang
Atmos. Chem. Phys. Discuss., 9, 16941–16972, https://doi.org/10.5194/acpd-9-16941-2009, https://doi.org/10.5194/acpd-9-16941-2009, 2009
Revised manuscript not accepted (discussion: closed, 6 comments)
31 Jul 2009
Characteristics and source apportionment of atmospheric aerosols at the summit of Mount Tai during summertime
H. Xu, Y. Wang, T. Wen, Y. Yang, and Y. Zhao
Atmos. Chem. Phys. Discuss., 9, 16361–16379, https://doi.org/10.5194/acpd-9-16361-2009, https://doi.org/10.5194/acpd-9-16361-2009, 2009
Revised manuscript has not been submitted (discussion: closed, 4 comments)
31 Jul 2009
Information-based mid-upper tropospheric methane derived from Atmospheric Infrared Sounder (AIRS) and its validation
X. Xiong, C. Barnet, J. Wei, and E. Maddy
Atmos. Chem. Phys. Discuss., 9, 16331–16360, https://doi.org/10.5194/acpd-9-16331-2009, https://doi.org/10.5194/acpd-9-16331-2009, 2009
Revised manuscript not accepted (discussion: closed, 4 comments)
29 Jul 2009
Spatial and temporal variability in surface ozone at a high elevation remote site in Nepal
G. W. K. Moore, S. Abernethy, and J. L. Semple
Atmos. Chem. Phys. Discuss., 9, 16233–16266, https://doi.org/10.5194/acpd-9-16233-2009, https://doi.org/10.5194/acpd-9-16233-2009, 2009
Revised manuscript has not been submitted (discussion: closed, 4 comments)
28 Jul 2009
Attribution of ozone radiative forcing trend to individual NOx sources
K. Dahlmann, V. Grewe, M. Ponater, and S. Matthes
Atmos. Chem. Phys. Discuss., 9, 16131–16162, https://doi.org/10.5194/acpd-9-16131-2009, https://doi.org/10.5194/acpd-9-16131-2009, 2009
Revised manuscript not accepted (discussion: closed, 4 comments)
24 Jul 2009
Secondary organic material formed by methylglyoxal in aqueous aerosol mimics – Part 2: Product identification using Aerosol-CIMS
N. Sareen, E. L. Shapiro, A. N. Schwier, and V. F. McNeill
Atmos. Chem. Phys. Discuss., 9, 15567–15594, https://doi.org/10.5194/acpd-9-15567-2009, https://doi.org/10.5194/acpd-9-15567-2009, 2009
Revised manuscript has not been submitted (discussion: closed, 9 comments)
24 Jun 2009
High temporal resolution VHF radar observations of stratospheric air intrusions in to the upper troposphere during the passage of a mesoscale convective system over Gadanki (13.5° N, 79.2° E)
K. K. Kumar and K. N. Uma
Atmos. Chem. Phys. Discuss., 9, 13843–13857, https://doi.org/10.5194/acpd-9-13843-2009, https://doi.org/10.5194/acpd-9-13843-2009, 2009
Revised manuscript not accepted (discussion: closed, 4 comments)
17 Jun 2009
A photochemical model and sensitivity study of the triple-oxygen isotopic (Δ17O) composition of NOy, HOx, and H2O2 in a polluted boundary layer
G. Dominguez, G. Wilkins, and M. H. Thiemens
Atmos. Chem. Phys. Discuss., 9, 13355–13406, https://doi.org/10.5194/acpd-9-13355-2009, https://doi.org/10.5194/acpd-9-13355-2009, 2009
Revised manuscript has not been submitted (discussion: closed, 4 comments)
12 Jun 2009
Evidence of the water-cage effect on the photolysis of NO3- and FeOH2+, and its implications for the photochemistry at the air-water interface of atmospheric droplets
P. Nissenson, D. Dabdub, R. Das, V. Maurino, C. Minero, and D. Vione
Atmos. Chem. Phys. Discuss., 9, 13123–13153, https://doi.org/10.5194/acpd-9-13123-2009, https://doi.org/10.5194/acpd-9-13123-2009, 2009
Revised manuscript not accepted (discussion: closed, 8 comments)
08 Jun 2009
Trans-Pacific transport of Asian dust and CO: accumulation of biomass burning CO in the subtropics and dipole structure of transport
J. Nam, Y. Wang, C. Luo, and D. A. Chu
Atmos. Chem. Phys. Discuss., 9, 12899–12926, https://doi.org/10.5194/acpd-9-12899-2009, https://doi.org/10.5194/acpd-9-12899-2009, 2009
Revised manuscript not accepted (discussion: closed, 3 comments)
30 Apr 2009
The effects of Forbush decreases on Antarctic climate variability: a re-assessment
B. A. Laken and D. R. Kniveton
Atmos. Chem. Phys. Discuss., 9, 10575–10596, https://doi.org/10.5194/acpd-9-10575-2009, https://doi.org/10.5194/acpd-9-10575-2009, 2009
Preprint withdrawn (discussion: closed, 3 comments)
16 Apr 2009
A comparison of water uptake by aerosols using two thermodynamic models
L. Xu, J. E. Penner, S. Metzger, and J. Lelieveld
Atmos. Chem. Phys. Discuss., 9, 9551–9595, https://doi.org/10.5194/acpd-9-9551-2009, https://doi.org/10.5194/acpd-9-9551-2009, 2009
Revised manuscript has not been submitted (discussion: closed, 17 comments)
26 Mar 2009
n-Aldehydes (C6–C10) in snow samples collected at the high alpine research station Jungfraujoch during CLACE 5
K. Sieg, E. Starokozhev, E. Fries, S. Sala, and W. Püttmann
Atmos. Chem. Phys. Discuss., 9, 8071–8099, https://doi.org/10.5194/acpd-9-8071-2009, https://doi.org/10.5194/acpd-9-8071-2009, 2009
Revised manuscript not accepted (discussion: closed, 4 comments)
10 Mar 2009
Adjoint inverse modeling of a CO emission inventory at the city scale: Santiago de Chile's case
P. Saide, A. Osses, L. Gallardo, and M. Osses
Atmos. Chem. Phys. Discuss., 9, 6325–6361, https://doi.org/10.5194/acpd-9-6325-2009, https://doi.org/10.5194/acpd-9-6325-2009, 2009
Revised manuscript not accepted (discussion: closed, 4 comments)
25 Feb 2009
Closure on the single scattering albedo in the WRF-Chem framework using data from the MILAGRO campaign
J. C. Barnard, J. D. Fast, G. Paredes-Miranda, and W. P. Arnott
Atmos. Chem. Phys. Discuss., 9, 5009–5054, https://doi.org/10.5194/acpd-9-5009-2009, https://doi.org/10.5194/acpd-9-5009-2009, 2009
Revised manuscript has not been submitted (discussion: closed, 4 comments)
04 Feb 2009
Particle number emissions of motor traffic derived from street canyon measurements in a Central European city
S. Klose, W. Birmili, J. Voigtländer, T. Tuch, B. Wehner, A. Wiedensohler, and M. Ketzel
Atmos. Chem. Phys. Discuss., 9, 3763–3809, https://doi.org/10.5194/acpd-9-3763-2009, https://doi.org/10.5194/acpd-9-3763-2009, 2009
Revised manuscript has not been submitted (discussion: closed, 2 comments)
03 Feb 2009
Deep-convective vertical transport: what is mass flux?
J.-I. Yano
Atmos. Chem. Phys. Discuss., 9, 3535–3553, https://doi.org/10.5194/acpd-9-3535-2009, https://doi.org/10.5194/acpd-9-3535-2009, 2009
Revised manuscript not accepted (discussion: closed, 4 comments)
02 Feb 2009
Cloud-type dependencies of MODIS and AMSR-E liquid water path differences
M. de la Torre Juárez, B. H. Kahn, and E. J. Fetzer
Atmos. Chem. Phys. Discuss., 9, 3367–3399, https://doi.org/10.5194/acpd-9-3367-2009, https://doi.org/10.5194/acpd-9-3367-2009, 2009
Manuscript not accepted for further review (discussion: closed, 4 comments)
02 Feb 2009
Sulfur isotope analysis of individual aerosol particles – a new tool for studying heterogeneous oxidation processes in the marine environment
B. W. Sinha, P. Hoppe, J. Huth, S. Foley, and M. O. Andreae
Atmos. Chem. Phys. Discuss., 9, 3307–3365, https://doi.org/10.5194/acpd-9-3307-2009, https://doi.org/10.5194/acpd-9-3307-2009, 2009
Revised manuscript has not been submitted (discussion: closed, 3 comments)
30 Jan 2009
High-ozone layers in the middle and upper troposphere above Central Europe: strong import from the stratosphere over the Pacific Ocean
T. Trickl, N. Bärtsch-Ritter, H. Eisele, M. Furger, R. Mücke, and A. Stohl
Atmos. Chem. Phys. Discuss., 9, 3113–3166, https://doi.org/10.5194/acpd-9-3113-2009, https://doi.org/10.5194/acpd-9-3113-2009, 2009
Manuscript not accepted for further review (discussion: closed, 3 comments)
29 Jan 2009
2003 megafires in Australia: impact on tropospheric ozone and aerosols
G. Guerova and N. Jones
Atmos. Chem. Phys. Discuss., 9, 3007–3040, https://doi.org/10.5194/acpd-9-3007-2009, https://doi.org/10.5194/acpd-9-3007-2009, 2009
Revised manuscript has not been submitted (discussion: closed, 2 comments)
22 Jan 2009
Spatial variation of modelled and measured NO, NO2 and O3 concentrations in the polluted urban landscape – relation to meteorology during the Göte-2005 campaign
J. Klingberg, L. Tang, D. Chen, G. Pihl Karlsson, E. Bäck, and H. Pleijel
Atmos. Chem. Phys. Discuss., 9, 2081–2111, https://doi.org/10.5194/acpd-9-2081-2009, https://doi.org/10.5194/acpd-9-2081-2009, 2009
Revised manuscript has not been submitted (discussion: closed, 4 comments)
22 Jan 2009
Influence of semi-volatile species on particle hygroscopic growth
P. Villani, K. Sellegri, M. Monier, and P. Laj
Atmos. Chem. Phys. Discuss., 9, 2021–2047, https://doi.org/10.5194/acpd-9-2021-2009, https://doi.org/10.5194/acpd-9-2021-2009, 2009
Revised manuscript not accepted (discussion: closed, 3 comments)
21 Jan 2009
C3-C5 alkanes in the atmosphere: concentration, seasonal cycle and contribution to the atmospheric budgets of acetone and acetaldehyde
A. Pozzer, J. Pollmann, D. Taraborrelli, P. Jöckel, D. Helmig, P. Tans, J. Hueber, and J. Lelieveld
Atmos. Chem. Phys. Discuss., 9, 1939–1976, https://doi.org/10.5194/acpd-9-1939-2009, https://doi.org/10.5194/acpd-9-1939-2009, 2009
Revised manuscript has not been submitted (discussion: closed, 5 comments)
14 Jan 2009
An extreme CO pollution event over Indonesia measured by the MOPITT instrument
F. Nichitiu, J. R. Drummond, J. Kar, and J. Zou
Atmos. Chem. Phys. Discuss., 9, 1211–1233, https://doi.org/10.5194/acpd-9-1211-2009, https://doi.org/10.5194/acpd-9-1211-2009, 2009
Revised manuscript not accepted (discussion: closed, 5 comments)
13 Jan 2009
A QBO-signal in mesospheric water vapor measurements at ALOMAR (69.29° N, 16.03° E) and in model calculations by LIMA over a solar cycle
G. R. Sonnemann, P. Hartogh, S. Li, M. Grygalashvyly, and U. Berger
Atmos. Chem. Phys. Discuss., 9, 883–903, https://doi.org/10.5194/acpd-9-883-2009, https://doi.org/10.5194/acpd-9-883-2009, 2009
Revised manuscript has not been submitted (discussion: closed, 6 comments)
06 Jan 2009
Quantitative long-term measurements of VOC concentrations by PTR-MS: annual cycle at a boreal forest site
T. M. Ruuskanen, R. Taipale, J. Rinne, M. K. Kajos, H. Hakola, and M. Kulmala
Atmos. Chem. Phys. Discuss., 9, 81–134, https://doi.org/10.5194/acpd-9-81-2009, https://doi.org/10.5194/acpd-9-81-2009, 2009
Manuscript not accepted for further review (discussion: closed, 4 comments)
05 Jan 2009
Common inorganic ions are efficient catalysts for organic reactions in atmospheric aerosols and other natural environments
B. Nozière, P. Dziedzic, and A. Córdova
Atmos. Chem. Phys. Discuss., 9, 1–21, https://doi.org/10.5194/acpd-9-1-2009, https://doi.org/10.5194/acpd-9-1-2009, 2009
Preprint withdrawn (discussion: closed, 6 comments)
08 Dec 2008
Effects of model resolution on entrainment (inversion heights), cloud-radiation interactions, and cloud radiative forcing
H. Guo, Y. Liu, P. H. Daum, X. Zeng, X. Li, and W.-K. Tao
Atmos. Chem. Phys. Discuss., 8, 20399–20425, https://doi.org/10.5194/acpd-8-20399-2008, https://doi.org/10.5194/acpd-8-20399-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 2 comments)
27 Nov 2008
Estimates of mercury flux into the United States from non-local and global sources: results from a 3-D CTM simulation
B. A. Drewniak, V. R. Kotamarthi, D. Streets, M. Kim, and K. Crist
Atmos. Chem. Phys. Discuss., 8, 19861–19890, https://doi.org/10.5194/acpd-8-19861-2008, https://doi.org/10.5194/acpd-8-19861-2008, 2008
Revised manuscript not accepted (discussion: closed, 3 comments)
06 Oct 2008
A case study on biomass burning aerosols: effects on solar UV irradiance, retrieval of aerosol single scattering albedo
A. Bagheri, B. Kjeldstad, and B. Johnsen
Atmos. Chem. Phys. Discuss., 8, 17987–18005, https://doi.org/10.5194/acpd-8-17987-2008, https://doi.org/10.5194/acpd-8-17987-2008, 2008
Revised manuscript not accepted (discussion: closed, 6 comments)
19 Sep 2008
On the validity of representing hurricanes as Carnot heat engine
A. M. Makarieva, V. G. Gorshkov, and B.-L. Li
Atmos. Chem. Phys. Discuss., 8, 17423–17437, https://doi.org/10.5194/acpd-8-17423-2008, https://doi.org/10.5194/acpd-8-17423-2008, 2008
Revised manuscript not accepted (discussion: closed, 33 comments)
18 Sep 2008
Temporal trends of anthropogenic SO2 emitted by non-ferrous metal smelters in Peru and Russia estimated from Satellite observations
M. F. Khokhar, U. Platt, and T. Wagner
Atmos. Chem. Phys. Discuss., 8, 17393–17422, https://doi.org/10.5194/acpd-8-17393-2008, https://doi.org/10.5194/acpd-8-17393-2008, 2008
Revised manuscript not accepted (discussion: closed, 7 comments)
11 Sep 2008
Observing three dimensional water vapour using a surface network of GPS receivers
S. de Haan and H. van der Marel
Atmos. Chem. Phys. Discuss., 8, 17193–17235, https://doi.org/10.5194/acpd-8-17193-2008, https://doi.org/10.5194/acpd-8-17193-2008, 2008
Revised manuscript not accepted (discussion: closed, 7 comments)
10 Sep 2008
Dust aerosol optical properties over North China
Shengjie Niu and Xiaofeng Xu
Atmos. Chem. Phys. Discuss., 8, 17037–17059, https://doi.org/10.5194/acpd-8-17037-2008, https://doi.org/10.5194/acpd-8-17037-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 3 comments)
01 Sep 2008
Secondary organic aerosol formation from reaction of tertiary amines with nitrate radical
M. E. Erupe, D. J. Price, P. J. Silva, Q. G. J. Malloy, L. Qi, B. Warren, and D. R. Cocker III
Atmos. Chem. Phys. Discuss., 8, 16585–16608, https://doi.org/10.5194/acpd-8-16585-2008, https://doi.org/10.5194/acpd-8-16585-2008, 2008
Manuscript not accepted for further review (discussion: closed, 4 comments)
25 Aug 2008
A quasi-Lagrangian coordinate system based on high resolution tracer observations: implementation for the Antarctic polar vortex
E. V. Ivanova, C. M. Volk, O. Riediger, H. Klein, N. M. Sitnikov, A. E. Ulanovskii, V. A. Yushkov, F. Ravegnani, T. Möbius, and U. Schmidt
Atmos. Chem. Phys. Discuss., 8, 16123–16173, https://doi.org/10.5194/acpd-8-16123-2008, https://doi.org/10.5194/acpd-8-16123-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 2 comments)
22 Aug 2008
Global error maps of aerosol optical properties: an error propagation analysis
K. Tsigaridis, Y. Balkanski, M. Schulz, and A. Benedetti
Atmos. Chem. Phys. Discuss., 8, 16027–16059, https://doi.org/10.5194/acpd-8-16027-2008, https://doi.org/10.5194/acpd-8-16027-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 6 comments)
20 Aug 2008
Effects of sea surface winds on marine aerosols characteristics and impacts on longwave radiative forcing over the Arabian Sea
Vijayakumar S. Nair, S. Suresh Babu, S. K. Satheesh, and K. Krishna Moorthy
Atmos. Chem. Phys. Discuss., 8, 15855–15899, https://doi.org/10.5194/acpd-8-15855-2008, https://doi.org/10.5194/acpd-8-15855-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 6 comments)
30 Jul 2008
Secondary organic aerosol formation from toluene photooxidation under various NOx conditions and particle acidity
G. Cao and M. Jang
Atmos. Chem. Phys. Discuss., 8, 14467–14495, https://doi.org/10.5194/acpd-8-14467-2008, https://doi.org/10.5194/acpd-8-14467-2008, 2008
Revised manuscript not accepted (discussion: closed, 4 comments)
25 Jul 2008
Implementation of a boundary layer heat flux parameterization into the Regional Atmospheric Modeling System (RAMS)
E. L. McGrath-Spangler, A. S. Denning, K. D. Corbin, and I. T. Baker
Atmos. Chem. Phys. Discuss., 8, 14311–14346, https://doi.org/10.5194/acpd-8-14311-2008, https://doi.org/10.5194/acpd-8-14311-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 3 comments)
15 Jul 2008
Nadir measurements of the Earth's atmosphere with the ACE FTS: first results
W. F. J. Evans, E. Puckrin, K. Walker, D. Wunch, J. Drummond, S. McLeod, C. Boone, and P. Bernath
Atmos. Chem. Phys. Discuss., 8, 13355–13373, https://doi.org/10.5194/acpd-8-13355-2008, https://doi.org/10.5194/acpd-8-13355-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 2 comments)
09 Jul 2008
Technical Note: Formation of airborne ice crystals in a wall independent reactor (WIR) under atmospheric conditions
E. Fries, W. Haunold, E. Starokozhev, K. Palitzsch, R. Sitals, W. Jaeschke, and W. Püttmann
Atmos. Chem. Phys. Discuss., 8, 13017–13042, https://doi.org/10.5194/acpd-8-13017-2008, https://doi.org/10.5194/acpd-8-13017-2008, 2008
Revised manuscript not accepted (discussion: closed, 3 comments)
25 Jun 2008
Ozone prediction based on meteorological variables: a fuzzy inductive reasoning approach
A. Nebot, V. Mugica, and A. Escobet
Atmos. Chem. Phys. Discuss., 8, 12343–12370, https://doi.org/10.5194/acpd-8-12343-2008, https://doi.org/10.5194/acpd-8-12343-2008, 2008
Revised manuscript not accepted (discussion: closed, 4 comments)
11 Jun 2008
Radiation transfer in stratus clouds at the BSRN Payerne site
D. Nowak, L. Vuilleumier, and A. Ohmura
Atmos. Chem. Phys. Discuss., 8, 11453–11485, https://doi.org/10.5194/acpd-8-11453-2008, https://doi.org/10.5194/acpd-8-11453-2008, 2008
Revised manuscript not accepted (discussion: closed, 3 comments)
28 May 2008
Measurement of black carbon at Syowa station, Antarctica: seasonal variation, transport processes and pathways
K. Hara, K. Osada, M. Yabuki, M. Hayashi, T. Yamanouchi, M. Shiobara, and M. Wada
Atmos. Chem. Phys. Discuss., 8, 9883–9929, https://doi.org/10.5194/acpd-8-9883-2008, https://doi.org/10.5194/acpd-8-9883-2008, 2008
Revised manuscript not accepted (discussion: closed, 4 comments)
07 May 2008
Seasonal variations in aerosol optical properties over China
Y. Wang, J. Xin, Z. Li, S. Wang, P. Wang, W. M. Hao, B. L. Nordgren, H. Chen, L. Wang, and Y. Sun
Atmos. Chem. Phys. Discuss., 8, 8431–8453, https://doi.org/10.5194/acpd-8-8431-2008, https://doi.org/10.5194/acpd-8-8431-2008, 2008
Revised manuscript not accepted (discussion: closed, 6 comments)
23 Apr 2008
Comparison of several wood smoke markers and source apportionment methods for wood burning particulate mass
J. Sandradewi, A. S. H. Prévôt, M. R. Alfarra, S. Szidat, M. N. Wehrli, M. Ruff, S. Weimer, V. A. Lanz, E. Weingartner, N. Perron, A. Caseiro, A. Kasper-Giebl, H. Puxbaum, L. Wacker, and U. Baltensperger
Atmos. Chem. Phys. Discuss., 8, 8091–8118, https://doi.org/10.5194/acpd-8-8091-2008, https://doi.org/10.5194/acpd-8-8091-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 2 comments)
22 Apr 2008
Evaluation of the tropospheric flows to a major Southern Hemisphere stratospheric warming event using NCEP/NCAR Reanalysis data with a PSU/NCAR nudging MM5V3 model
K. Wang
Atmos. Chem. Phys. Discuss., 8, 7953–7976, https://doi.org/10.5194/acpd-8-7953-2008, https://doi.org/10.5194/acpd-8-7953-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 4 comments)
16 Apr 2008
The chemistry influencing ODEs in the Polar Boundary Layer in spring: a model study
M. Piot and R. von Glasow
Atmos. Chem. Phys. Discuss., 8, 7391–7453, https://doi.org/10.5194/acpd-8-7391-2008, https://doi.org/10.5194/acpd-8-7391-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 2 comments)
07 Apr 2008
Combustion particulate emissions in Africa: regional climate modeling and validation
A. Konare, C. Liousse, B. Guillaume, F. Solmon, P. Assamoi, R. Rosset, J. M. Gregoire, and F. Giorgi
Atmos. Chem. Phys. Discuss., 8, 6653–6681, https://doi.org/10.5194/acpd-8-6653-2008, https://doi.org/10.5194/acpd-8-6653-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 2 comments)
04 Mar 2008
Validation of water vapour profiles from the Atmospheric Chemistry Experiment (ACE)
M. R. Carleer, C. D. Boone, K. A. Walker, P. F. Bernath, K. Strong, R. J. Sica, C. E. Randall, H. Vömel, J. Kar, M. Höpfner, M. Milz, T. von Clarmann, R. Kivi, J. Valverde-Canossa, C. E. Sioris, M. R. M. Izawa, E. Dupuy, C. T. McElroy, J. R. Drummond, C. R. Nowlan, J. Zou, F. Nichitiu, S. Lossow, J. Urban, D. Murtagh, and D. G. Dufour
Atmos. Chem. Phys. Discuss., 8, 4499–4559, https://doi.org/10.5194/acpd-8-4499-2008, https://doi.org/10.5194/acpd-8-4499-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 3 comments)
03 Mar 2008
Radiative forcing from modelled and observed stratospheric ozone changes due to the 11-year solar cycle
I. S. A. Isaksen, B. Rognerud, G. Myhre, J. D. Haigh, S. T. Rumbold, K. P. Shine, C. Zerefos, K. Tourpali, and W. Randel
Atmos. Chem. Phys. Discuss., 8, 4353–4371, https://doi.org/10.5194/acpd-8-4353-2008, https://doi.org/10.5194/acpd-8-4353-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 2 comments)
28 Feb 2008
Lagrangian transport modelling for CO2 using two different biosphere models
G. Pieterse, A. T. Vermeulen, I. T. Baker, and A. S. Denning
Atmos. Chem. Phys. Discuss., 8, 4117–4154, https://doi.org/10.5194/acpd-8-4117-2008, https://doi.org/10.5194/acpd-8-4117-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 6 comments)
20 Feb 2008
Airborne measurements of HCl from the marine boundary layer to the lower stratosphere over the North Pacific Ocean during INTEX-B
S. Kim, L. G. Huey, R. E. Stickel, R. B. Pierce, G. Chen, M. A. Avery, J. E. Dibb, G. S. Diskin, G. W. Sachse, C. S. McNaughton, A. D. Clarke, B. E. Anderson, and D. R. Blake
Atmos. Chem. Phys. Discuss., 8, 3563–3595, https://doi.org/10.5194/acpd-8-3563-2008, https://doi.org/10.5194/acpd-8-3563-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 3 comments)
18 Feb 2008
Antarctic network of lamp-calibrated multichannel radiometers for continuous ozone and uv radiation data
A. Redondas, C. Torres, O. Meinander, K. Lakkala, R. García, E. Cuevas, H. Ochoa, G. Deferrari, and S. Díaz
Atmos. Chem. Phys. Discuss., 8, 3383–3404, https://doi.org/10.5194/acpd-8-3383-2008, https://doi.org/10.5194/acpd-8-3383-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 2 comments)
15 Feb 2008
Carbon monoxide observations from ground stations in France and Europe and long trends in the free troposphere
A. Chevalier, F. Gheusi, J.-L. Attié, R. Delmas, R. Zbinden, G. Athier, and J.-M. Cousin
Atmos. Chem. Phys. Discuss., 8, 3313–3356, https://doi.org/10.5194/acpd-8-3313-2008, https://doi.org/10.5194/acpd-8-3313-2008, 2008
Preprint withdrawn (discussion: closed, 6 comments)
14 Feb 2008
Total column ozone variations over oceanic region around Indian sub-continent during pre-monsoon of 2006
M. C. R. Kalapureddy, P. Ernest Raj, and P. C. S. Devara
Atmos. Chem. Phys. Discuss., 8, 3143–3162, https://doi.org/10.5194/acpd-8-3143-2008, https://doi.org/10.5194/acpd-8-3143-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 3 comments)
13 Feb 2008
A mechanism for biologically-induced iodine emissions from sea-ice
A. Saiz-Lopez and C. S. Boxe
Atmos. Chem. Phys. Discuss., 8, 2953–2976, https://doi.org/10.5194/acpd-8-2953-2008, https://doi.org/10.5194/acpd-8-2953-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 10 comments)
06 Feb 2008
Global ozone and air quality: a multi-model assessment of risks to human health and crops
K. Ellingsen, M. Gauss, R. Van Dingenen, F. J. Dentener, L. Emberson, A. M. Fiore, M. G. Schultz, D. S. Stevenson, M. R. Ashmore, C. S. Atherton, D. J. Bergmann, I. Bey, T. Butler, J. Drevet, H. Eskes, D. A. Hauglustaine, I. S. A. Isaksen, L. W. Horowitz, M. Krol, J. F. Lamarque, M. G. Lawrence, T. van Noije, J. Pyle, S. Rast, J. Rodriguez, N. Savage, S. Strahan, K. Sudo, S. Szopa, and O. Wild
Atmos. Chem. Phys. Discuss., 8, 2163–2223, https://doi.org/10.5194/acpd-8-2163-2008, https://doi.org/10.5194/acpd-8-2163-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 3 comments)
24 Jan 2008
Ten years of CO2, CH4, CO and N2O fluxes over Western Europe inferred from atmospheric measurements at Mace Head, Ireland
C. Messager, M. Schmidt, M. Ramonet, P. Bousquet, P. Simmonds, A. Manning, V. Kazan, G. Spain, S. G. Jennings, and P. Ciais
Atmos. Chem. Phys. Discuss., 8, 1191–1237, https://doi.org/10.5194/acpd-8-1191-2008, https://doi.org/10.5194/acpd-8-1191-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 3 comments)
23 Jan 2008
Proposal of a new erythemal UV radiation amplification factor
A. Serrano, M. Antón, M. L. Cancillo, and J. A. García
Atmos. Chem. Phys. Discuss., 8, 1089–1111, https://doi.org/10.5194/acpd-8-1089-2008, https://doi.org/10.5194/acpd-8-1089-2008, 2008
Revised manuscript not accepted (discussion: closed, 5 comments)
02 Jan 2008
Estimated UV doses to psoriasis patients during climate therapy at Gran Canaria in March 2006
L. T. N. Nilsen, E. Søyland, and A. L. Krogstad
Atmos. Chem. Phys. Discuss., 8, 1–19, https://doi.org/10.5194/acpd-8-1-2008, https://doi.org/10.5194/acpd-8-1-2008, 2008
Revised manuscript has not been submitted (discussion: closed, 4 comments)
13 Dec 2007
Improving the solar zenith angle dependence of broadband UV radiometers calibration
M. L. Cancillo, A. Serrano, M. Antón, J. A. García, and J. M. Vilaplana
Atmos. Chem. Phys. Discuss., 7, 17873–17892, https://doi.org/10.5194/acpd-7-17873-2007, https://doi.org/10.5194/acpd-7-17873-2007, 2007
Revised manuscript not accepted (discussion: closed, 4 comments)
14 Nov 2007
Transport and dispersion of atmospheric sulphur dioxide from an industrial coastal area during a sea-breeze event
C. Talbot, C. Leroy, P. Augustin, V. Willart, H. Delbarre, M. Fourmentin, and G. Khomenko
Atmos. Chem. Phys. Discuss., 7, 15989–16022, https://doi.org/10.5194/acpd-7-15989-2007, https://doi.org/10.5194/acpd-7-15989-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 5 comments)
13 Nov 2007
Impact of upper-level jet-generated inertia-gravity waves on surface wind and precipitation
C. Zülicke and D. H. W. Peters
Atmos. Chem. Phys. Discuss., 7, 15873–15909, https://doi.org/10.5194/acpd-7-15873-2007, https://doi.org/10.5194/acpd-7-15873-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 2 comments)
12 Nov 2007
20-year LiDAR observations of stratospheric sudden warming over a mid-latitude site, Observatoire de Haute Provence (OHP; 44° N, 6° E): case study and statistical characteristics
D. V. Charyulu, V. Sivakumar, H. Bencherif, G. Kirgis, A. Hauchecorne, P. Keckhut, and D. Narayana Rao
Atmos. Chem. Phys. Discuss., 7, 15739–15779, https://doi.org/10.5194/acpd-7-15739-2007, https://doi.org/10.5194/acpd-7-15739-2007, 2007
Revised manuscript not accepted (discussion: closed, 4 comments)
05 Nov 2007
Dust aerosol radiative effect and influence on urban atmospheric boundary layer
L. Zhang, M. Chen, and L. Li
Atmos. Chem. Phys. Discuss., 7, 15565–15580, https://doi.org/10.5194/acpd-7-15565-2007, https://doi.org/10.5194/acpd-7-15565-2007, 2007
Revised manuscript not accepted (discussion: closed, 6 comments)
25 Oct 2007
Characterizing mega-city pollution with TES O3 and CO measurements
C. Shim, Q. Li, M. Luo, S. Kulawik, H. Worden, J. Worden, A. Eldering, G. Diskin, G. Sachse, A. Weinheimer, D. Knapp, D. Montzca, and T. Campos
Atmos. Chem. Phys. Discuss., 7, 15189–15212, https://doi.org/10.5194/acpd-7-15189-2007, https://doi.org/10.5194/acpd-7-15189-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 2 comments)
19 Oct 2007
The daytime mixing layer observed by radiosonde, profiler, and lidar during MILAGRO
W. J. Shaw, M. S. Pekour, R. L. Coulter, T. J. Martin, and J. T. Walters
Atmos. Chem. Phys. Discuss., 7, 15025–15065, https://doi.org/10.5194/acpd-7-15025-2007, https://doi.org/10.5194/acpd-7-15025-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 2 comments)
10 Oct 2007
Extreme associated functions: optimally linking local extremes to large-scale atmospheric circulation structures
D. Panja and F. M. Selten
Atmos. Chem. Phys. Discuss., 7, 14433–14460, https://doi.org/10.5194/acpd-7-14433-2007, https://doi.org/10.5194/acpd-7-14433-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 2 comments)
09 Oct 2007
Oceanic phytoplankton, atmospheric aerosol and Raman scattering impacts on space-based ultraviolet radiance measurements
R.-M. Hu and R. S. Sokhi
Atmos. Chem. Phys. Discuss., 7, 14351–14367, https://doi.org/10.5194/acpd-7-14351-2007, https://doi.org/10.5194/acpd-7-14351-2007, 2007
Revised manuscript not accepted (discussion: closed, 7 comments)
09 Oct 2007
Aerosol-cloud interactions in the NASA GMI: model development and indirect forcing assessments
N. Meskhidze, R. E. P. Sotiropoulou, A. Nenes, J. Kouatchou, B. Das, and J. M. Rodriguez
Atmos. Chem. Phys. Discuss., 7, 14295–14330, https://doi.org/10.5194/acpd-7-14295-2007, https://doi.org/10.5194/acpd-7-14295-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 5 comments)
05 Oct 2007
Ammonia at Blodgett Forest, Sierra Nevada, USA
M. L. Fischer and D. Littlejohn
Atmos. Chem. Phys. Discuss., 7, 14139–14169, https://doi.org/10.5194/acpd-7-14139-2007, https://doi.org/10.5194/acpd-7-14139-2007, 2007
Revised manuscript not accepted (discussion: closed, 4 comments)
28 Sep 2007
Methane emissions from boreal and tropical forest ecosystems derived from in-situ measurements
V. Sinha, J. Williams, P. J. Crutzen, and J. Lelieveld
Atmos. Chem. Phys. Discuss., 7, 14011–14039, https://doi.org/10.5194/acpd-7-14011-2007, https://doi.org/10.5194/acpd-7-14011-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 8 comments)
25 Sep 2007
Average molecular weight of surfactants in aerosols
M. T. Latif and P. Brimblecombe
Atmos. Chem. Phys. Discuss., 7, 13805–13838, https://doi.org/10.5194/acpd-7-13805-2007, https://doi.org/10.5194/acpd-7-13805-2007, 2007
Preprint withdrawn (discussion: closed, 5 comments)
17 Sep 2007
Non-methane hydrocarbons source apportionment at different sites in Mexico City during 2002–2003
E. Vega, G. Sanchez, and L. Molina
Atmos. Chem. Phys. Discuss., 7, 13561–13596, https://doi.org/10.5194/acpd-7-13561-2007, https://doi.org/10.5194/acpd-7-13561-2007, 2007
Revised manuscript not accepted (discussion: closed, 8 comments)
12 Sep 2007
Primary marine aerosol emissions: size resolved eddy covariance measurements with estimates of the sea salt and organic carbon fractions
E. D. Nilsson, E. M. Mårtensson, J. S. Van Ekeren, G. de Leeuw, M. Moerman, and C. O'Dowd
Atmos. Chem. Phys. Discuss., 7, 13345–13400, https://doi.org/10.5194/acpd-7-13345-2007, https://doi.org/10.5194/acpd-7-13345-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 3 comments)
12 Sep 2007
Properties of polar stratospheric clouds obtained by combined ACE-FTS and ACE-Imager extinction measurements
A. Y. Zasetsky, K. Gilbert, I. Galkina, S. McLeod, and J. J. Sloan
Atmos. Chem. Phys. Discuss., 7, 13271–13290, https://doi.org/10.5194/acpd-7-13271-2007, https://doi.org/10.5194/acpd-7-13271-2007, 2007
Revised manuscript not accepted (discussion: closed, 4 comments)
07 Sep 2007
Cospectral analysis of high frequency signal loss in eddy covariance measurements
A. Wolf and E. A. Laca
Atmos. Chem. Phys. Discuss., 7, 13151–13173, https://doi.org/10.5194/acpd-7-13151-2007, https://doi.org/10.5194/acpd-7-13151-2007, 2007
Revised manuscript not accepted (discussion: closed, 9 comments)
13 Aug 2007
The relevance of aerosol optical depth to cumulus fraction changes: a five-year climatology at the ACRF SGP site
E. I. Kassianov, L. K. Berg, C. Flynn, and S. McFarlane
Atmos. Chem. Phys. Discuss., 7, 11797–11837, https://doi.org/10.5194/acpd-7-11797-2007, https://doi.org/10.5194/acpd-7-11797-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 3 comments)
02 Aug 2007
Predicting diurnal variability of fine inorganic aerosols and their gas-phase precursors near downtown Mexico City
M. Moya, C. Fountoukis, A. Nenes, E. Matías, and M. Grutter
Atmos. Chem. Phys. Discuss., 7, 11257–11294, https://doi.org/10.5194/acpd-7-11257-2007, https://doi.org/10.5194/acpd-7-11257-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 4 comments)
27 Jul 2007
Water dimer absorption of visible light
J. Hargrove
Atmos. Chem. Phys. Discuss., 7, 11123–11140, https://doi.org/10.5194/acpd-7-11123-2007, https://doi.org/10.5194/acpd-7-11123-2007, 2007
Revised manuscript not accepted (discussion: closed, 6 comments)
13 Jul 2007
Multiwavelength and polarization lidar measurements of Asian dust layers over Tsukuba, Japan: a case study
T. Sakai, T. Nagai, T. Kobayashi, A. Yamazaki, A. Uchiyama, and Y. Mano
Atmos. Chem. Phys. Discuss., 7, 10179–10203, https://doi.org/10.5194/acpd-7-10179-2007, https://doi.org/10.5194/acpd-7-10179-2007, 2007
Preprint withdrawn (discussion: closed, 4 comments)
11 Jul 2007
Air-to-sea flux of soluble iron: is it driven more by HNO3 or SO2? – an examination in the light of dust aging
H. Yang and Y. Gao
Atmos. Chem. Phys. Discuss., 7, 10043–10063, https://doi.org/10.5194/acpd-7-10043-2007, https://doi.org/10.5194/acpd-7-10043-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 6 comments)
10 Jul 2007
MIPAS reference atmospheres and comparisons to V4.61/V4.62 MIPAS level 2 geophysical data sets
J. J. Remedios, R. J. Leigh, A. M. Waterfall, D. P. Moore, H. Sembhi, I. Parkes, J. Greenhough, M.P. Chipperfield, and D. Hauglustaine
Atmos. Chem. Phys. Discuss., 7, 9973–10017, https://doi.org/10.5194/acpd-7-9973-2007, https://doi.org/10.5194/acpd-7-9973-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 2 comments)
25 Jun 2007
Is there a stratospheric fountain?
J.-P. Pommereau and G. Held
Atmos. Chem. Phys. Discuss., 7, 8933–8950, https://doi.org/10.5194/acpd-7-8933-2007, https://doi.org/10.5194/acpd-7-8933-2007, 2007
Revised manuscript not accepted (discussion: closed, 10 comments)
19 Jun 2007
A new comprehensive approach to characterizing carbonaceous aerosol with an application to wintertime Fresno, California PM2.5
P. Herckes, J. A. Leenheer, and J. L. Collett Jr.
Atmos. Chem. Phys. Discuss., 7, 8423–8453, https://doi.org/10.5194/acpd-7-8423-2007, https://doi.org/10.5194/acpd-7-8423-2007, 2007
Revised manuscript not accepted (discussion: closed, 6 comments)
18 Jun 2007
Development of a secondary organic aerosol formation mechanism: comparison with smog chamber experiments and atmospheric measurements
L. E. Olcese, J. E. Penner, and S. Sillman
Atmos. Chem. Phys. Discuss., 7, 8361–8393, https://doi.org/10.5194/acpd-7-8361-2007, https://doi.org/10.5194/acpd-7-8361-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 4 comments)
04 Jun 2007
Contributions of anthropogenic and natural sources of sulfur to SO2, H2SO4(g) and nanoparticle formation
D. D. Lucas and H. Akimoto
Atmos. Chem. Phys. Discuss., 7, 7679–7721, https://doi.org/10.5194/acpd-7-7679-2007, https://doi.org/10.5194/acpd-7-7679-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 2 comments)
30 May 2007
Aerosol climatology: dependence of the Angstrom exponent on wavelength over four AERONET sites
D. G. Kaskaoutis, H. D. Kambezidis, N. Hatzianastassiou, P. G. Kosmopoulos, and K. V. S. Badarinath
Atmos. Chem. Phys. Discuss., 7, 7347–7397, https://doi.org/10.5194/acpd-7-7347-2007, https://doi.org/10.5194/acpd-7-7347-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 3 comments)
24 May 2007
Mesospheric turbulence during PMWE-conducive conditions
C. M. Hall, A. H. Manson, C. E. Meek, and S. Nozawa
Atmos. Chem. Phys. Discuss., 7, 7035–7049, https://doi.org/10.5194/acpd-7-7035-2007, https://doi.org/10.5194/acpd-7-7035-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 3 comments)
15 May 2007
Ground-based measurements of tropospheric and stratospheric bromine monoxide above Nairobi (1° S, 36° E)
S. Fietkau, T. Medeke, A. Richter, N. Sheode, B.-M. Sinnhuber, F. Wittrock, N. Theys, M. van Roozendael, and J. P. Burrows
Atmos. Chem. Phys. Discuss., 7, 6527–6555, https://doi.org/10.5194/acpd-7-6527-2007, https://doi.org/10.5194/acpd-7-6527-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 3 comments)
11 May 2007
Aerosol climatology: on the discrimination of aerosol types over four AERONET sites
D. G. Kaskaoutis, H. D. Kambezidis, N. Hatzianastassiou, P. G. Kosmopoulos, and K. V. S. Badarinath
Atmos. Chem. Phys. Discuss., 7, 6357–6411, https://doi.org/10.5194/acpd-7-6357-2007, https://doi.org/10.5194/acpd-7-6357-2007, 2007
Revised manuscript not accepted (discussion: closed, 4 comments)
27 Apr 2007
Use of neural networks for tropospheric ozone time series approximation and forecasting – a review
A. A. Argiriou
Atmos. Chem. Phys. Discuss., 7, 5739–5767, https://doi.org/10.5194/acpd-7-5739-2007, https://doi.org/10.5194/acpd-7-5739-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 4 comments)
21 Mar 2007
Understanding the formation of biogenic secondary organic aerosol from α-pinene in smog chamber studies: role of organic peroxy radicals
B. Bonn, H. Korhonen, T. Petäjä, M. Boy, and M. Kulmala
Atmos. Chem. Phys. Discuss., 7, 3901–3939, https://doi.org/10.5194/acpd-7-3901-2007, https://doi.org/10.5194/acpd-7-3901-2007, 2007
Revised manuscript not accepted (discussion: closed, 6 comments)
23 Feb 2007
Extended observations of volcanic SO2 and sulfate aerosol in the stratosphere
S. A. Carn, N. A. Krotkov, K. Yang, R. M. Hoff, A. J. Prata, A. J. Krueger, S. C. Loughlin, and P. F. Levelt
Atmos. Chem. Phys. Discuss., 7, 2857–2871, https://doi.org/10.5194/acpd-7-2857-2007, https://doi.org/10.5194/acpd-7-2857-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 4 comments)
16 Feb 2007
Cloud droplet activation: solubility revisited
L. T. Padró and A. Nenes
Atmos. Chem. Phys. Discuss., 7, 2325–2355, https://doi.org/10.5194/acpd-7-2325-2007, https://doi.org/10.5194/acpd-7-2325-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 3 comments)
26 Jan 2007
Observing cirrus halos to constrain in-situ measurements of ice crystal size
T. J. Garrett, M. B. Kimball, G. G. Mace, and D. G. Baumgardner
Atmos. Chem. Phys. Discuss., 7, 1295–1325, https://doi.org/10.5194/acpd-7-1295-2007, https://doi.org/10.5194/acpd-7-1295-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 6 comments)
23 Jan 2007
Evidence of tropospheric layering: interleaved stratospheric and planetary boundary layer intrusions
J. Brioude, J.-P. Cammas, R. M. Zbinden, and V. Thouret
Atmos. Chem. Phys. Discuss., 7, 1119–1142, https://doi.org/10.5194/acpd-7-1119-2007, https://doi.org/10.5194/acpd-7-1119-2007, 2007
Revised manuscript has not been submitted (discussion: closed, 3 comments)
08 Dec 2006
Regional characteristics of spring Asian dust and its impact on aerosol chemistry over northern China
Y. L. Sun, G. S. Zhuang, Z. F. Wang, Y. Wang, W. J. Zhang, A. H. Tang, X. J. Zhao, and L. Jia
Atmos. Chem. Phys. Discuss., 6, 12825–12864, https://doi.org/10.5194/acpd-6-12825-2006, https://doi.org/10.5194/acpd-6-12825-2006, 2006
Revised manuscript not accepted (discussion: closed, 8 comments)
04 Dec 2006
Isentropic advection and convective lifting of water vapor in the UT – LS as observed over Brazil (22° S) in February 2004 by in situ high-resolution measurements of H2O, CH4, O3 and temperature
G. Durry, N. Huret, A. Hauchecorne, V. Marecal, J.-P. Pommereau, R. L. Jones, G. Held, N. Larsen, and J.-B. Renard
Atmos. Chem. Phys. Discuss., 6, 12469–12501, https://doi.org/10.5194/acpd-6-12469-2006, https://doi.org/10.5194/acpd-6-12469-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 5 comments)
28 Nov 2006
The latitude dependence and probability distribution of polar mesospheric turbulence
M. Rapp, E. Becker, B. Strelnikov, and F.-J. Lübken
Atmos. Chem. Phys. Discuss., 6, 12199–12216, https://doi.org/10.5194/acpd-6-12199-2006, https://doi.org/10.5194/acpd-6-12199-2006, 2006
Revised manuscript not accepted (discussion: closed, 5 comments)
28 Nov 2006
SAWA experiment – properties of mineral dust aerosol as seen by synergic lidar and sun-photometer measurements
A. E. Kardas, K. M. Markowicz, S. P. Malinowski, G. Karasiński, T. Stacewicz, K. Stelmaszczyk, C. Hochhertz, and L. Woeste
Atmos. Chem. Phys. Discuss., 6, 12155–12178, https://doi.org/10.5194/acpd-6-12155-2006, https://doi.org/10.5194/acpd-6-12155-2006, 2006
Revised manuscript not accepted (discussion: closed, 5 comments)
24 Nov 2006
The weekend effect within and downwind of Sacramento: Part 2. Observational evidence for chemical and dynamical contributions
J. G. Murphy, D. A. Day, P. A. Cleary, P. J. Wooldridge, D. B. Millet, A. H. Goldstein, and R. C. Cohen
Atmos. Chem. Phys. Discuss., 6, 11971–12019, https://doi.org/10.5194/acpd-6-11971-2006, https://doi.org/10.5194/acpd-6-11971-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 2 comments)
23 Nov 2006
Aerosol distribution over the western Mediterranean basin during a Tramontane/Mistral event
T. Salameh, P. Drobinski, L. Menut, B. Bessagnet, C. Flamant, A. Hodzic, and R. Vautard
Atmos. Chem. Phys. Discuss., 6, 11913–11956, https://doi.org/10.5194/acpd-6-11913-2006, https://doi.org/10.5194/acpd-6-11913-2006, 2006
Revised manuscript not accepted (discussion: closed, 5 comments)
22 Nov 2006
Assimilation of TES CO into a global CTM: first results
N. A. D. Richards, Q. Li, K. W. Bowman, J. R. Worden, S. S. Kulawik, G. B. Osterman, H. M. Worden, J.-F. Lamarque, and B. V. Khattatov
Atmos. Chem. Phys. Discuss., 6, 11727–11743, https://doi.org/10.5194/acpd-6-11727-2006, https://doi.org/10.5194/acpd-6-11727-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 3 comments)
21 Nov 2006
Estimating a relationship between aerosol optical thickness and surface wind speed over the ocean
P. Glantz, D. E. Nilsson, and W. von Hoyningen-Huene
Atmos. Chem. Phys. Discuss., 6, 11621–11651, https://doi.org/10.5194/acpd-6-11621-2006, https://doi.org/10.5194/acpd-6-11621-2006, 2006
Revised manuscript not accepted (discussion: closed, 7 comments)
14 Nov 2006
Interannual variability and long term changes in planetary wave activity in the middle atmosphere observed by lidar
A. Hauchecorne, P. Keckhut, and M. L. Chanin
Atmos. Chem. Phys. Discuss., 6, 11299–11316, https://doi.org/10.5194/acpd-6-11299-2006, https://doi.org/10.5194/acpd-6-11299-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 8 comments)
06 Nov 2006
Investigation of how observed methane concentrations in Ny-Ålesund are influenced by atmospheric flow patterns
I. T. Pedersen and K. J. Holmén
Atmos. Chem. Phys. Discuss., 6, 11025–11049, https://doi.org/10.5194/acpd-6-11025-2006, https://doi.org/10.5194/acpd-6-11025-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 2 comments)
25 Oct 2006
A criterion to discriminate between solar and cosmic ray forcing of the terrestrial climate
H. Fichtner, K. Scherer, and B. Heber
Atmos. Chem. Phys. Discuss., 6, 10811–10836, https://doi.org/10.5194/acpd-6-10811-2006, https://doi.org/10.5194/acpd-6-10811-2006, 2006
Revised manuscript not accepted (discussion: closed, 3 comments)
20 Oct 2006
TRADEOFFs in climate effects through aircraft routing: forcing due to radiatively active gases
F. Stordal, M. Gauss, G. Myhre, E. Mancini, D. A. Hauglustaine, M. O. Köhler, T. Berntsen, E. J. .G Stordal, D. Iachetti, G. Pitari, and I. S. A. Isaksen
Atmos. Chem. Phys. Discuss., 6, 10733–10771, https://doi.org/10.5194/acpd-6-10733-2006, https://doi.org/10.5194/acpd-6-10733-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 3 comments)
20 Oct 2006
HONO and NO2 evolution from irradiated nitrate-doped ice and frozen nitrate solutions
T. Bartels-Rausch and D. J. Donaldson
Atmos. Chem. Phys. Discuss., 6, 10713–10731, https://doi.org/10.5194/acpd-6-10713-2006, https://doi.org/10.5194/acpd-6-10713-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 2 comments)
18 Oct 2006
Aerosol formation over the Boreal forest in Hyytiälä, Finland: monthly frequency and annual cycles – the roles of air mass characteristics and synoptic scale meteorology
E. D. Nilsson and M. Kulmala
Atmos. Chem. Phys. Discuss., 6, 10425–10462, https://doi.org/10.5194/acpd-6-10425-2006, https://doi.org/10.5194/acpd-6-10425-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 3 comments)
16 Oct 2006
Temperature dependence of secondary organic aerosol yield from the ozonolysis of β-pinene
C. Stenby, U. Pöschl, P. von Hessberg, M. Bilde, O. J. Nielsen, and G. K. Moortgat
Atmos. Chem. Phys. Discuss., 6, 10275–10297, https://doi.org/10.5194/acpd-6-10275-2006, https://doi.org/10.5194/acpd-6-10275-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 5 comments)
28 Sep 2006
Behavior of CCN to CN fraction during aging and mixing processes of atmospheric particles
S. Rojas, L. Gomes, and P. Villani
Atmos. Chem. Phys. Discuss., 6, 9545–9562, https://doi.org/10.5194/acpd-6-9545-2006, https://doi.org/10.5194/acpd-6-9545-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 2 comments)
25 Sep 2006
Sensitivity of middle atmospheric temperature and circulation in the UIUC GCM to the treatment of subgrid-scale gravity-wave breaking
F. Yang, M. E. Schlesinger, E. V. Rozanov, N. Andronova, V. A. Zubov, and L. B. Callis
Atmos. Chem. Phys. Discuss., 6, 9085–9121, https://doi.org/10.5194/acpd-6-9085-2006, https://doi.org/10.5194/acpd-6-9085-2006, 2006
Preprint withdrawn (discussion: closed, 4 comments)
19 Sep 2006
Source and origin of atmospheric trace elements entrapped in winter snow of the Italian Eastern Alps
P. Gabrielli, G. Cozzi, S. Torcini, P. Cescon, and C. Barbante
Atmos. Chem. Phys. Discuss., 6, 8781–8815, https://doi.org/10.5194/acpd-6-8781-2006, https://doi.org/10.5194/acpd-6-8781-2006, 2006
Revised manuscript not accepted (discussion: closed, 3 comments)
15 Sep 2006
COMET: a Lagrangian transport model for greenhouse gas emission estimation – forward model technique and performance for methane
A. T. Vermeulen, G. Pieterse, A. Hensen, W. C. M. van den Bulk, and J. W. Erisman
Atmos. Chem. Phys. Discuss., 6, 8727–8779, https://doi.org/10.5194/acpd-6-8727-2006, https://doi.org/10.5194/acpd-6-8727-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 4 comments)
04 Sep 2006
The effects of convection on the summertime mid-latitude overworld
A. E. Dessler
Atmos. Chem. Phys. Discuss., 6, 8421–8433, https://doi.org/10.5194/acpd-6-8421-2006, https://doi.org/10.5194/acpd-6-8421-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 3 comments)
24 Aug 2006
Intraseasonal variations of upper tropospheric water vapor in Asian monsoon region
R. Zhan, J. Li, and A. Gettelman
Atmos. Chem. Phys. Discuss., 6, 8069–8095, https://doi.org/10.5194/acpd-6-8069-2006, https://doi.org/10.5194/acpd-6-8069-2006, 2006
Revised manuscript not accepted (discussion: closed, 4 comments)
04 Aug 2006
Observations of sulfur dioxide uptake and new particle formation in a midlatitude cumulus cloud
J. R. Peter, S. T. Siems, J. B. Jensen, J. L. Gras, Y. Ishizaka, and J. M. Hacker
Atmos. Chem. Phys. Discuss., 6, 7471–7497, https://doi.org/10.5194/acpd-6-7471-2006, https://doi.org/10.5194/acpd-6-7471-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 4 comments)
25 Jul 2006
Rayleigh lidar observations of double stratopause structure over three different northern hemisphere stations
V. Sivakumar, H. Bencherif, A. Hauchecorne, P. Keckhut, D. N. Rao, S. Sharma, H. Chandra, A. Jayaraman, and P. B. Rao
Atmos. Chem. Phys. Discuss., 6, 6933–6956, https://doi.org/10.5194/acpd-6-6933-2006, https://doi.org/10.5194/acpd-6-6933-2006, 2006
Revised manuscript not accepted (discussion: closed, 4 comments)
20 Jul 2006
Comparison of CO2 fluxes estimated using atmospheric and oceanic inversions, and role of fluxes and their interannual variability in simulating atmospheric CO2 concentrations
P. K. Patra, S. E. Mikaloff Fletcher, K. Ishijima, S. Maksyutov, and T. Nakazawa
Atmos. Chem. Phys. Discuss., 6, 6801–6823, https://doi.org/10.5194/acpd-6-6801-2006, https://doi.org/10.5194/acpd-6-6801-2006, 2006
Revised manuscript not accepted (discussion: closed, 6 comments)
17 Jul 2006
Spectral characteristics of atmospheric pressure and electric field variations under severe weather conditions at high latitudes
E. A. Kasatkina, O. I. Shumilov, Y. A. Vinogradov, and A. N. Vasilyev
Atmos. Chem. Phys. Discuss., 6, 6613–6626, https://doi.org/10.5194/acpd-6-6613-2006, https://doi.org/10.5194/acpd-6-6613-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 2 comments)
13 Jul 2006
A physical modeling approach for identification of source regions of primary and secondary air pollutants
J. C. F. Lo, A. K. H. Lau, Z. B. Yuan, J. C. H. Fung, and F. Chen
Atmos. Chem. Phys. Discuss., 6, 6467–6496, https://doi.org/10.5194/acpd-6-6467-2006, https://doi.org/10.5194/acpd-6-6467-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 2 comments)
13 Jul 2006
Towards a climatology of stratospheric bromine monoxide from SCIAMACHY limb observations
N. Sheode, B.-M. Sinnhuber, A. Rozanov, and J. P. Burrows
Atmos. Chem. Phys. Discuss., 6, 6431–6466, https://doi.org/10.5194/acpd-6-6431-2006, https://doi.org/10.5194/acpd-6-6431-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 4 comments)
27 Jun 2006
Technical Note: Anthropogenic and natural offline emissions and the online EMissions and dry DEPosition submodel EMDEP of the Modular Earth Submodel system (MESSy)
L. N. Ganzeveld, J. A. van Aardenne, T. M. Butler, M. G. Lawrence, S. M. Metzger, P. Stier, P. Zimmermann, and J. Lelieveld
Atmos. Chem. Phys. Discuss., 6, 5457–5483, https://doi.org/10.5194/acpd-6-5457-2006, https://doi.org/10.5194/acpd-6-5457-2006, 2006
Preprint withdrawn (discussion: closed, 4 comments)
19 Jun 2006
Technical note: A method for measuring size-resolved CCN in the atmosphere
G. P. Frank, U. Dusek, and M. O. Andreae
Atmos. Chem. Phys. Discuss., 6, 4879–4895, https://doi.org/10.5194/acpd-6-4879-2006, https://doi.org/10.5194/acpd-6-4879-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 2 comments)
21 Apr 2006
Remote sensing of cirrus clouds and aerosols by a sun photometer in Tunisia
H. Chtioui, F. B. Mansour, S. Elouragini, and P. H. Flamant
Atmos. Chem. Phys. Discuss., 6, 3321–3335, https://doi.org/10.5194/acpd-6-3321-2006, https://doi.org/10.5194/acpd-6-3321-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 1 comment)
18 Apr 2006
Modeling of trace gases from the 1998 North Central Mexico forest fire smoke plume, as measured over Phoenix
V. R. Kotamarthi, P. V. Doskey, S. R. Springston, P. Hyde, J. S. Gaffney, and N. A. Marley
Atmos. Chem. Phys. Discuss., 6, 3227–3264, https://doi.org/10.5194/acpd-6-3227-2006, https://doi.org/10.5194/acpd-6-3227-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 3 comments)
13 Apr 2006
Methane production from mixed tropical savanna and forest vegetation in Venezuela
P. J. Crutzen, E. Sanhueza, and C. A. M. Brenninkmeijer
Atmos. Chem. Phys. Discuss., 6, 3093–3097, https://doi.org/10.5194/acpd-6-3093-2006, https://doi.org/10.5194/acpd-6-3093-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 8 comments)
02 Mar 2006
Atmospheric carbonyl sulfide (OCS) variation from 1992–2004 by ground-based solar FTIR spectrometry
N. M. Deutscher, N. B. Jones, D. W. T. Griffith, S. W. Wood, and F. J. Murcray
Atmos. Chem. Phys. Discuss., 6, 1619–1636, https://doi.org/10.5194/acpd-6-1619-2006, https://doi.org/10.5194/acpd-6-1619-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 3 comments)
23 Feb 2006
Characterization of iodine particles with Volatilization-Humidification Tandem Differential Mobility Analyser (VH-TDMA), Raman and SEM techniques
Z. D. Ristovski, C. Fletcher, B. D’Anna, G. R. Johnson, and J. T. Bostrom
Atmos. Chem. Phys. Discuss., 6, 1481–1508, https://doi.org/10.5194/acpd-6-1481-2006, https://doi.org/10.5194/acpd-6-1481-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 3 comments)
20 Feb 2006
Temporal and spectral variation of desert dust and biomass burning aerosol scenes from 1995–2000 using GOME
M. de Graaf, P. Stammes, and I. Aben
Atmos. Chem. Phys. Discuss., 6, 1321–1353, https://doi.org/10.5194/acpd-6-1321-2006, https://doi.org/10.5194/acpd-6-1321-2006, 2006
Revised manuscript not accepted (discussion: closed, 6 comments)
01 Feb 2006
Cn to ccn relationships and cloud microphysical properties in different air masses at a free tropospheric site
R. Dupuy, P. Laj, and K. Sellegri
Atmos. Chem. Phys. Discuss., 6, 879–898, https://doi.org/10.5194/acpd-6-879-2006, https://doi.org/10.5194/acpd-6-879-2006, 2006
Revised manuscript not accepted (discussion: closed, 4 comments)
02 Jan 2006
On the hygroscopic growth of ammoniated sulfate particles of non-stoichiometric composition
H. Kokkola, J. Joutsensaari, N. Hyppönen, K. E. J. Lehtinen, and A. Laaksonen
Atmos. Chem. Phys. Discuss., 6, 1–16, https://doi.org/10.5194/acpd-6-1-2006, https://doi.org/10.5194/acpd-6-1-2006, 2006
Revised manuscript has not been submitted (discussion: closed, 2 comments)
19 Dec 2005
A scaling analysis of ozone photochemistry: II Investigation of the similarity relationship
B. Ainslie and D. G. Steyn
Atmos. Chem. Phys. Discuss., 5, 12985–13010, https://doi.org/10.5194/acpd-5-12985-2005, https://doi.org/10.5194/acpd-5-12985-2005, 2005
Revised manuscript not accepted (discussion: closed, 4 comments)
13 Dec 2005
The use of tunnel concentration profile data to determine the ratio of NO2/NOx directly emitted from vehicles
X. Yao, N. T. Lau, C. K. Chan, and M. Fang
Atmos. Chem. Phys. Discuss., 5, 12723–12740, https://doi.org/10.5194/acpd-5-12723-2005, https://doi.org/10.5194/acpd-5-12723-2005, 2005
Revised manuscript not accepted (discussion: closed, 6 comments)
06 Dec 2005
Horizontal and vertical profiles of ozone, carbon monoxide, non-methane hydrocarbons and dimethyl sulphide near the Mace Head observatory, Ireland
R. M. Purvis, J. B. McQuaid, A. C. Lewis, J. R. Hopkins, and P. Simmonds
Atmos. Chem. Phys. Discuss., 5, 12505–12530, https://doi.org/10.5194/acpd-5-12505-2005, https://doi.org/10.5194/acpd-5-12505-2005, 2005
Revised manuscript has not been submitted (discussion: closed, 2 comments)
02 Nov 2005
Large eddy simulation of urban features for Copenhagen metropolitan area
A. Mahura, S. Leroyer, P. Mestayer, I. Calmet, S. Dupont, N. Long, A. Baklanov, C. Petersen, K. Sattler, and N. W. Nielsen
Atmos. Chem. Phys. Discuss., 5, 11183–11213, https://doi.org/10.5194/acpd-5-11183-2005, https://doi.org/10.5194/acpd-5-11183-2005, 2005
Revised manuscript has not been submitted (discussion: closed, 2 comments)
02 Nov 2005
Isoprene oxidation products are a significant atmospheric aerosol component
S. N. Matsunaga, C. Wiedinmyer, A. B. Guenther, J. J. Orlando, T. Karl, D. W. Toohey, J. P. Greenberg, and Y. Kajii
Atmos. Chem. Phys. Discuss., 5, 11143–11156, https://doi.org/10.5194/acpd-5-11143-2005, https://doi.org/10.5194/acpd-5-11143-2005, 2005
Revised manuscript not accepted (discussion: closed, 7 comments)
27 Oct 2005
Studies of aerosol at a coastal site using two aerosol mass spectrometry instruments and identification of biogenic particle types
M. Dall’Osto, R. M. Harrison, H. Furutani, K. A. Prather, H. Coe, and J. D. Allan
Atmos. Chem. Phys. Discuss., 5, 10799–10838, https://doi.org/10.5194/acpd-5-10799-2005, https://doi.org/10.5194/acpd-5-10799-2005, 2005
Revised manuscript not accepted (discussion: closed, 3 comments)
24 Oct 2005
A review of biomass burning emissions, part I: gaseous emissions of carbon monoxide, methane, volatile organic compounds, and nitrogen containing compounds
R. Koppmann, K. von Czapiewski, and J. S. Reid
Atmos. Chem. Phys. Discuss., 5, 10455–10516, https://doi.org/10.5194/acpd-5-10455-2005, https://doi.org/10.5194/acpd-5-10455-2005, 2005
Revised manuscript has not been submitted (discussion: closed, 2 comments)
24 Oct 2005
Stratospheric intrusions induced by a Rossby Wave breaking and its interaction with the subtropical jet during PICO3 campaign
A. Carré, F. Ravetta, J.-P. Cammas, P. Mascart, J. Duron, G. Ancellet, and D. Lambert
Atmos. Chem. Phys. Discuss., 5, 10301–10337, https://doi.org/10.5194/acpd-5-10301-2005, https://doi.org/10.5194/acpd-5-10301-2005, 2005
Revised manuscript has not been submitted (discussion: closed, 3 comments)
28 Sep 2005
Sensitivity studies on the photolysis rates calculation in Amazonian atmospheric chemistry – Part I: The impact of the direct radiative effect of biomass burning aerosol particles
L. M. M. Albuquerque, K. M. Longo, S. R. Freitas, T. Tarasova, A. Plana Fattori, C. Nobre, and L. V. Gatti
Atmos. Chem. Phys. Discuss., 5, 9325–9353, https://doi.org/10.5194/acpd-5-9325-2005, https://doi.org/10.5194/acpd-5-9325-2005, 2005
Revised manuscript has not been submitted (discussion: closed, 2 comments)
22 Sep 2005
The effect of aerosol on surface cloud radiative forcing in the Arctic
R.-M. Hu, J.-P. Blanchet, and E. Girard
Atmos. Chem. Phys. Discuss., 5, 9039–9063, https://doi.org/10.5194/acpd-5-9039-2005, https://doi.org/10.5194/acpd-5-9039-2005, 2005
Revised manuscript has not been submitted (discussion: closed, 3 comments)
20 Sep 2005
European surface ozone in the extreme summer 2003
S. Solberg, P. Coddeville, C. Forster, Ø. Hov, Y. Orsolini, and K. Uhse
Atmos. Chem. Phys. Discuss., 5, 9003–9038, https://doi.org/10.5194/acpd-5-9003-2005, https://doi.org/10.5194/acpd-5-9003-2005, 2005
Revised manuscript has not been submitted (discussion: closed, 4 comments)
18 Aug 2005
Technical note: application of α-QSS to the numerical integration of kinetic equations in tropospheric chemistry
F. Liu, E. Schaller, and D. R. Mott
Atmos. Chem. Phys. Discuss., 5, 6215–6262, https://doi.org/10.5194/acpd-5-6215-2005, https://doi.org/10.5194/acpd-5-6215-2005, 2005
Revised manuscript has not been submitted (discussion: closed, 2 comments)
01 Aug 2005
Transport and mixing zone of desert dust and sulphate over Tropical Africa and the Atlantic Ocean region
K. V. Desboeufs and G. Cautenet
Atmos. Chem. Phys. Discuss., 5, 5615–5644, https://doi.org/10.5194/acpd-5-5615-2005, https://doi.org/10.5194/acpd-5-5615-2005, 2005
Revised manuscript has not been submitted (discussion: closed, 2 comments)
13 Jul 2005
Observations of total alkyl nitrates within the Sacramento Urban Plume
P. A. Cleary, J. G. Murphy, P. J. Wooldridge, D. A. Day, D. B. Millet, M. McKay, A. H. Goldstein, and R. C. Cohen
Atmos. Chem. Phys. Discuss., 5, 4801–4843, https://doi.org/10.5194/acpd-5-4801-2005, https://doi.org/10.5194/acpd-5-4801-2005, 2005
Revised manuscript not accepted (discussion: closed, 4 comments)
04 Jul 2005
Retrieval and validation of ozone columns derived from measurements of SCIAMACHY on Envisat
H. J. Eskes, R. J. van der A, E. J. Brinksma, J. P. Veefkind, J. F. de Haan, and P. J. M. Valks
Atmos. Chem. Phys. Discuss., 5, 4429–4475, https://doi.org/10.5194/acpd-5-4429-2005, https://doi.org/10.5194/acpd-5-4429-2005, 2005
Revised manuscript has not been submitted (discussion: closed, 2 comments)
10 Jun 2005
Coagulation of combustion generated nanoparticles and their measurement behind vehicle engines: can they play a role as atmospheric pollutants?
H.-H. Grotheer, T. Gonzalez Baquet, M. Thierley, H. Pokorny, and M. Aigner
Atmos. Chem. Phys. Discuss., 5, 3847–3872, https://doi.org/10.5194/acpd-5-3847-2005, https://doi.org/10.5194/acpd-5-3847-2005, 2005
Revised manuscript not accepted (discussion: closed, 6 comments)
19 May 2005
Tropospheric O3 over Indonesia during biomass burning events measured with GOME (Global Ozone Monitoring Experiment) and compared with trajectory analysis
A. Ladstätter-Weißenmayer, J. Meyer-Arnek, A. Richter, F. Wittrock, and J. P. Burrows
Atmos. Chem. Phys. Discuss., 5, 3105–3130, https://doi.org/10.5194/acpd-5-3105-2005, https://doi.org/10.5194/acpd-5-3105-2005, 2005
Revised manuscript not accepted (discussion: closed, 4 comments)
04 May 2005
Characterization of air ions in boreal forest air during BIOFOR III campaign
U. Hõrrak, P. P. Aalto, J. Salm, J. M. Mäkelä, L. Laakso, L. Laakso, and M. Kulmala
Atmos. Chem. Phys. Discuss., 5, 2749–2790, https://doi.org/10.5194/acpd-5-2749-2005, https://doi.org/10.5194/acpd-5-2749-2005, 2005
Revised manuscript has not been submitted (discussion: closed, 2 comments)
03 May 2005
Planetary waves in a coupled chemistry-climate model: analysis techniques and comparison with reanalysis data
F. Mager and M. Dameris
Atmos. Chem. Phys. Discuss., 5, 2559–2598, https://doi.org/10.5194/acpd-5-2559-2005, https://doi.org/10.5194/acpd-5-2559-2005, 2005
Revised manuscript has not been submitted (discussion: closed, 3 comments)
22 Apr 2005
Commentary on ''Measurements of ice supersaturations exceeding 100% at the cold tropical tropopause'' by E. Jensen et al.
D. M. Murphy
Atmos. Chem. Phys. Discuss., 5, 2463–2468, https://doi.org/10.5194/acpd-5-2463-2005, https://doi.org/10.5194/acpd-5-2463-2005, 2005
Revised manuscript has not been submitted (discussion: closed, 6 comments)
21 Feb 2005
Stratospheric temperatures and tracer transport in a nudged 4-year middle atmosphere GCM simulation
M. K. van Aalst, J. Lelieveld, B. Steil, C. Brühl, P. Jöckel, M. A. Giorgetta, and G.-J. Roelofs
Atmos. Chem. Phys. Discuss., 5, 961–1006, https://doi.org/10.5194/acpd-5-961-2005, https://doi.org/10.5194/acpd-5-961-2005, 2005
Revised manuscript has not been submitted (discussion: closed, 2 comments)
11 Feb 2005
The surface properties of SOA generated from limonene and toluene using specific molecular probes: exploration of a new experimental technique
B. Demirdjian and M. J. Rossi
Atmos. Chem. Phys. Discuss., 5, 607–654, https://doi.org/10.5194/acpd-5-607-2005, https://doi.org/10.5194/acpd-5-607-2005, 2005
Revised manuscript not accepted (discussion: closed, 3 comments)
31 Jan 2005
Parcel model simulations of aerosol – warm phase cloud microphysics interactions over the Amazon
A. A. Costa and S. Sherwood
Atmos. Chem. Phys. Discuss., 5, 481–508, https://doi.org/10.5194/acpd-5-481-2005, https://doi.org/10.5194/acpd-5-481-2005, 2005
Revised manuscript has not been submitted (discussion: closed, 3 comments)
10 Jan 2005
Deep stratosphere-to-troposphere transport (STT) over SE Europe: a complex case study captured by enhanced 7Be concentrations at the surface of a low topography region
E. Gerasopoulos, P. Zanis, C. Papastefanou, C. S. Zerefos, A. Ioannidou, and H. Wernli
Atmos. Chem. Phys. Discuss., 5, 101–129, https://doi.org/10.5194/acpd-5-101-2005, https://doi.org/10.5194/acpd-5-101-2005, 2005
Revised manuscript not accepted (discussion: closed, 4 comments)
08 Dec 2004
Quantification of mesoscale transport across the boundaries of the free troposphere: a new method and applications to ozone
F. Gheusi, J.-P. Cammas, F. Cousin, C. Mari, and P. Mascart
Atmos. Chem. Phys. Discuss., 4, 8103–8139, https://doi.org/10.5194/acpd-4-8103-2004, https://doi.org/10.5194/acpd-4-8103-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 4 comments)
29 Nov 2004
A pseudo-Lagrangian model study of the size distribution properties over Scandinavia: transport from Aspvreten to Värriö
P. Tunved, H. Korhonen, J. Ström, H.-C. Hansson, K. E. J. Lehtinen, and M. Kulmala
Atmos. Chem. Phys. Discuss., 4, 7757–7794, https://doi.org/10.5194/acpd-4-7757-2004, https://doi.org/10.5194/acpd-4-7757-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 2 comments)
24 Nov 2004
Application of osmolality for the determination of water activity and the modelling of cloud formation
G. Kiss and H.-C. Hansson
Atmos. Chem. Phys. Discuss., 4, 7667–7689, https://doi.org/10.5194/acpd-4-7667-2004, https://doi.org/10.5194/acpd-4-7667-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 2 comments)
19 Nov 2004
Observations of convective cooling in the tropical tropopause layer in AIRS data
H. Kim and A. E. Dessler
Atmos. Chem. Phys. Discuss., 4, 7615–7629, https://doi.org/10.5194/acpd-4-7615-2004, https://doi.org/10.5194/acpd-4-7615-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 4 comments)
22 Oct 2004
A global satellite view of aerosol cloud interactions
C. Luo
Atmos. Chem. Phys. Discuss., 4, 6823–6836, https://doi.org/10.5194/acpd-4-6823-2004, https://doi.org/10.5194/acpd-4-6823-2004, 2004
Revised manuscript not accepted (discussion: closed, 5 comments)
16 Sep 2004
Atmospheric pseudohalogen chemistry
D. J. Lary
Atmos. Chem. Phys. Discuss., 4, 5381–5405, https://doi.org/10.5194/acpd-4-5381-2004, https://doi.org/10.5194/acpd-4-5381-2004, 2004
Revised manuscript not accepted (discussion: closed, 4 comments)
10 Sep 2004
Intercomparison of stratospheric ozone and temperature measurements at the Observatoire de Haute Provence during the OTOIC NDSC validation campaign from 1–18 July 1997
G. O. Braathen, S. Godin-Beekmann, P. Keckhut, T. J. McGee, M. R. Gross, C. Vialle, and A. Hauchecorne
Atmos. Chem. Phys. Discuss., 4, 5303–5344, https://doi.org/10.5194/acpd-4-5303-2004, https://doi.org/10.5194/acpd-4-5303-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 4 comments)
10 Aug 2004
Long-range transport of ozone and related pollutants over the North Atlantic in spring and summer
S. A. Penkett, M. J. Evans, C. E. Reeves, K. S. Law, P. S. Monks, S. J. B. Bauguitte, J. A. Pyle, T. J. Green, B. J. Bandy, G. Mills, L. M. Cardenas, H. Barjat, D. Kley, S. Schmitgen, J. M. Kent, K. Dewey, and J. Methven
Atmos. Chem. Phys. Discuss., 4, 4407–4454, https://doi.org/10.5194/acpd-4-4407-2004, https://doi.org/10.5194/acpd-4-4407-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 2 comments)
30 Jun 2004
Using an extended Kalman filter learning algorithm for feed-forward neural networks to describe tracer correlations
D. J. Lary and H. Y. Mussa
Atmos. Chem. Phys. Discuss., 4, 3653–3667, https://doi.org/10.5194/acpd-4-3653-2004, https://doi.org/10.5194/acpd-4-3653-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 3 comments)
22 Jun 2004
High ozone at rural sites in India
D. Chand and S. Lal
Atmos. Chem. Phys. Discuss., 4, 3359–3380, https://doi.org/10.5194/acpd-4-3359-2004, https://doi.org/10.5194/acpd-4-3359-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 3 comments)
24 May 2004
The mixing height in urban areas: comparative study for Copenhagen
A. Baklanov and A. Kuchin
Atmos. Chem. Phys. Discuss., 4, 2839–2866, https://doi.org/10.5194/acpd-4-2839-2004, https://doi.org/10.5194/acpd-4-2839-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 2 comments)
04 May 2004
Nitrogen oxides measurements in an Amazon site and enhancements associated with a cold front
A. M. Cordova, K. Longo, S. Freitas, L. V. Gatti, P. Artaxo, A. Procópio, M. A. F. Silva Dias, and E. D. Freitas
Atmos. Chem. Phys. Discuss., 4, 2301–2331, https://doi.org/10.5194/acpd-4-2301-2004, https://doi.org/10.5194/acpd-4-2301-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 2 comments)
04 May 2004
Sudden increases in the NO2 column caused by thunderstorms: a case study in the northern subtropical region
M. Gil, M. Yela, E. Cuevas, and V. Carreño
Atmos. Chem. Phys. Discuss., 4, 2263–2281, https://doi.org/10.5194/acpd-4-2263-2004, https://doi.org/10.5194/acpd-4-2263-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 4 comments)
21 Apr 2004
Comment on “Improving the seasonal cycle and interannual variations of biomass burning aerosol sources" by Generoso et al.
Y. Ji and E. Stocker
Atmos. Chem. Phys. Discuss., 4, 2161–2166, https://doi.org/10.5194/acpd-4-2161-2004, https://doi.org/10.5194/acpd-4-2161-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 2 comments)
05 Apr 2004
Quantification of the impact in mid-latitudes of chemical ozone depletion in the 1999/2000 Arctic polar vortex prior to the vortex breakup
G. Koch, H. Wernli, S. Buss, J. Staehelin, T. Peter, M. A. Liniger, and S. Meilinger
Atmos. Chem. Phys. Discuss., 4, 1911–1940, https://doi.org/10.5194/acpd-4-1911-2004, https://doi.org/10.5194/acpd-4-1911-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 2 comments)
08 Mar 2004
3-D chemistry-transport model Polair: numerical issues, validation and automatic-differentiation strategy
V. Mallet and B. Sportisse
Atmos. Chem. Phys. Discuss., 4, 1371–1392, https://doi.org/10.5194/acpd-4-1371-2004, https://doi.org/10.5194/acpd-4-1371-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 2 comments)
02 Mar 2004
Seasonal cycles of isoprene concentrations in the Amazonian rainforest
C. R. Trostdorf, L. V. Gatti, A. Yamazaki, M. J. Potosnak, A. Guenther, W. C. Martins, and J. W. Munger
Atmos. Chem. Phys. Discuss., 4, 1291–1310, https://doi.org/10.5194/acpd-4-1291-2004, https://doi.org/10.5194/acpd-4-1291-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 2 comments)
16 Feb 2004
Passenger aircraft project CARIBIC 1997–2002, Part II: the ventilation of the lowermost stratosphere
A. Zahn, C. A. M. Brenninkmeijer, and P. F. J. van Velthoven
Atmos. Chem. Phys. Discuss., 4, 1119–1150, https://doi.org/10.5194/acpd-4-1119-2004, https://doi.org/10.5194/acpd-4-1119-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 2 comments)
16 Feb 2004
Passenger aircraft project CARIBIC 1997–2002, Part I: the extratropical chemical tropopause
A. Zahn, C. A. M. Brenninkmeijer, and P. F. J. van Velthoven
Atmos. Chem. Phys. Discuss., 4, 1091–1117, https://doi.org/10.5194/acpd-4-1091-2004, https://doi.org/10.5194/acpd-4-1091-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 2 comments)
11 Feb 2004
Tropospheric ozone budget: regional and global calculations
F. M. O’Connor, K. S. Law, J. A. Pyle, H. Barjat, N. Brough, K. Dewey, T. Green, J. Kent, and G. Phillips
Atmos. Chem. Phys. Discuss., 4, 991–1036, https://doi.org/10.5194/acpd-4-991-2004, https://doi.org/10.5194/acpd-4-991-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 3 comments)
16 Jan 2004
Cold air outbreaks and their signature in the ozonometric data at the mountain station near Kislovodsk, Russia
N. P. Chakina, A. R. Ivanova, and I. N. Kuznetsova
Atmos. Chem. Phys. Discuss., 4, 267–297, https://doi.org/10.5194/acpd-4-267-2004, https://doi.org/10.5194/acpd-4-267-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 4 comments)
07 Jan 2004
Sources and distribution of trace species in Alpine precipitation inferred from two 60-year ice core paleorecords
A. Eichler, M. Schwikowski, M. Furger, U. Schotterer, and H. W. Gäggeler
Atmos. Chem. Phys. Discuss., 4, 71–108, https://doi.org/10.5194/acpd-4-71-2004, https://doi.org/10.5194/acpd-4-71-2004, 2004
Revised manuscript has not been submitted (discussion: closed, 6 comments)
16 Dec 2003
Height of convective layer in planetary atmospheres with condensable and non-condensable greenhouse substances
A. M. Makarieva, V. G. Gorshkov, and T. Pujol
Atmos. Chem. Phys. Discuss., 3, 6701–6720, https://doi.org/10.5194/acpd-3-6701-2003, https://doi.org/10.5194/acpd-3-6701-2003, 2003
Revised manuscript has not been submitted (discussion: closed, 8 comments)
26 Nov 2003
On the influence of fuel sulfur induced stable negative ion formation on the total concentration of ions emitted by an aircraft gas turbine engine: comparison of model and experiment
A. Sorokin, F. Arnold, and P. Mirabel
Atmos. Chem. Phys. Discuss., 3, 6001–6018, https://doi.org/10.5194/acpd-3-6001-2003, https://doi.org/10.5194/acpd-3-6001-2003, 2003
Revised manuscript has not been submitted (discussion: closed, 5 comments)
14 Nov 2003
Problems regarding the tropospheric O3 residual method and its interpretation in Fishman et al. (2003)
A. D. J. de Laat and I. Aben
Atmos. Chem. Phys. Discuss., 3, 5777–5802, https://doi.org/10.5194/acpd-3-5777-2003, https://doi.org/10.5194/acpd-3-5777-2003, 2003
Revised manuscript has not been submitted (discussion: closed, 11 comments)
29 Oct 2003
Measurements of reactive chlorocarbons over the Surinam tropical rain forest: indications for strong biogenic emissions
H. A. Scheeren, J. Lelieveld, J. Williams, H. Fischer, and C. Warneke
Atmos. Chem. Phys. Discuss., 3, 5469–5512, https://doi.org/10.5194/acpd-3-5469-2003, https://doi.org/10.5194/acpd-3-5469-2003, 2003
Revised manuscript has not been submitted (discussion: closed, 3 comments)
22 Oct 2003
Assessment of possible airborne impact from nuclear risk sites – Part II: probabilistic analysis of atmospheric transport patterns in Euro-Arctic region
A. G. Mahura and A. A. Baklanov
Atmos. Chem. Phys. Discuss., 3, 5319–5356, https://doi.org/10.5194/acpd-3-5319-2003, https://doi.org/10.5194/acpd-3-5319-2003, 2003
Revised manuscript has not been submitted (discussion: closed, 3 comments)
21 Aug 2003
Cloud thermodynamic phase and particle size estimation using the 0.67 and 1.6 μm channels from meteorological satellites
D. Jolivet and A. J. Feijt
Atmos. Chem. Phys. Discuss., 3, 4461–4488, https://doi.org/10.5194/acpd-3-4461-2003, https://doi.org/10.5194/acpd-3-4461-2003, 2003
Revised manuscript has not been submitted (discussion: closed, 2 comments)
08 Jul 2003
Validation of a 3-D hemispheric nested air pollution model
L. M. Frohn, J. H. Christensen, J. Brandt, C. Geels, and K. M. Hansen
Atmos. Chem. Phys. Discuss., 3, 3543–3588, https://doi.org/10.5194/acpd-3-3543-2003, https://doi.org/10.5194/acpd-3-3543-2003, 2003
Revised manuscript has not been submitted (discussion: closed, 4 comments)
20 Jun 2003
Radiative effects of tropospheric ionisation
K. L. Aplin
Atmos. Chem. Phys. Discuss., 3, 3205–3221, https://doi.org/10.5194/acpd-3-3205-2003, https://doi.org/10.5194/acpd-3-3205-2003, 2003
Revised manuscript has not been submitted (discussion: closed, 4 comments)
15 Apr 2003
Aircraft measurements of nitrogen oxides, ozone, and carbon monoxide during MINOS 2001: distributions and correlation analyses
J. Heland, H. Ziereis, H. Schlager, M. de Reus, M. Traub, J. Lelieveld, G.-J. Roelofs, P. Stock, and A. Roiger
Atmos. Chem. Phys. Discuss., 3, 1991–2026, https://doi.org/10.5194/acpd-3-1991-2003, https://doi.org/10.5194/acpd-3-1991-2003, 2003
Revised manuscript has not been submitted (discussion: closed, 1 comment)
27 Mar 2003
The Mt Cimone, Italy, free tropospheric campaign: principal characteristics of the gaseous and aerosol composition from European pollution, Mediterranean influences and during African dust events
Y. Balkanski, S. E. Bauer, R. van Dingenen, P. Bonasoni, M. Schulz, H. Fischer, G. P. Gobbi, M. Hanke, D. Hauglustaine, J. P. Putaud, A. Stohl, and F. Raes
Atmos. Chem. Phys. Discuss., 3, 1753–1776, https://doi.org/10.5194/acpd-3-1753-2003, https://doi.org/10.5194/acpd-3-1753-2003, 2003
Revised manuscript has not been submitted (discussion: closed, 1 comment)
13 Feb 2003
An evolution strategy to estimate emission source distributions on a regional scale from atmospheric observations
P. O’Brien, D. Corcoran, and D. Lowry
Atmos. Chem. Phys. Discuss., 3, 1333–1366, https://doi.org/10.5194/acpd-3-1333-2003, https://doi.org/10.5194/acpd-3-1333-2003, 2003
Revised manuscript has not been submitted (discussion: closed, 4 comments)
03 Feb 2003
Nitric acid partitioning in cirrus clouds: a synopsis based on field, laboratory and model studies
M. Krämer, J. Beuermann, C. Schiller, F. Grimm, F. Arnold, T. Peter, S. Meilinger, A. Meier, J. Hendricks, A. Petzold, and H. Schlager
Atmos. Chem. Phys. Discuss., 3, 413–443, https://doi.org/10.5194/acpd-3-413-2003, https://doi.org/10.5194/acpd-3-413-2003, 2003
Revised manuscript has not been submitted (discussion: closed, 4 comments)
06 Jan 2003
LC-MS analysis of aerosol particles from the oxidation of α-pinene by ozone and OH-radicals
R. Winterhalter, R. Van Dingenen, B. R. Larsen, N. R. Jensen, and J. Hjorth
Atmos. Chem. Phys. Discuss., 3, 1–39, https://doi.org/10.5194/acpd-3-1-2003, https://doi.org/10.5194/acpd-3-1-2003, 2003
Revised manuscript has not been submitted (discussion: closed, 3 comments)
11 Nov 2002
Modelling studies of wind field on urban environment
K. Radics, J. Bartholy, and R. Pongrácz
Atmos. Chem. Phys. Discuss., 2, 1979–2001, https://doi.org/10.5194/acpd-2-1979-2002, https://doi.org/10.5194/acpd-2-1979-2002, 2002
Revised manuscript has not been submitted (discussion: closed, 2 comments)
17 Sep 2002
Atmospheric deposition of toxics onto the Seine Estuary, France: example of polycyclic aromatic hydrocarbons
A. Motelay-Massei, D. Ollivon, B. Garban, and M. Chevreuil
Atmos. Chem. Phys. Discuss., 2, 1351–1369, https://doi.org/10.5194/acpd-2-1351-2002, https://doi.org/10.5194/acpd-2-1351-2002, 2002
Revised manuscript has not been submitted (discussion: closed, 1 comment)
02 May 2002
Observations of large stratospheric ozone variations over Mendoza, Argentina
C. Puliafito, S. Enrique Puliafito, and G. K. Hartmann
Atmos. Chem. Phys. Discuss., 2, 507–523, https://doi.org/10.5194/acpd-2-507-2002, https://doi.org/10.5194/acpd-2-507-2002, 2002
Revised manuscript has not been submitted (discussion: closed, 2 comments)
12 Apr 2002
The impact of a deep convection on sulfate transport and redistribution
V. Spiridonov and M. Curic
Atmos. Chem. Phys. Discuss., 2, 385–430, https://doi.org/10.5194/acpd-2-385-2002, https://doi.org/10.5194/acpd-2-385-2002, 2002
Revised manuscript has not been submitted (discussion: closed, 6 comments)
08 Mar 2002
Greenhouse effect dependence on atmospheric concentrations of greenhouse substances and the nature of climate stability on Earth
V. G. Gorshkov and A. M. Makarieva
Atmos. Chem. Phys. Discuss., 2, 289–337, https://doi.org/10.5194/acpd-2-289-2002, https://doi.org/10.5194/acpd-2-289-2002, 2002
Revised manuscript has not been submitted (discussion: closed, 3 comments)