https://acp.copernicus.org/articles/ Combined list of the recent articles of the journal Atmospheric Chemistry and Physics and the recent discussion forum Atmospheric Chemistry and Physics Discussions en https://doi.org/10.5194/acp-26-7895-2026 Comparing secondary organic aerosols schemes implemented in current chemical transport models and the policy implications of uncertainties Ling Huang, Benjie Chen, Zi'ang Wu, Katie Tuite, Pradeepa Vennam, Greg Yarwood, and Li Li Atmos. Chem. Phys., 26, 7895–7915, https://doi.org/10.5194/acp-26-7895-2026, 2026 Secondary organic aerosol (SOA) constitutes a major component of atmospheric aerosol that models must account for to assess how human activities influence air quality, climate, and public health. We find substantial differences in how current air quality models represent SOA highlighting a lack of consensus within the modelling community. Our findings emphasize the need to recognize the limitations of current SOA schemes in the context of air quality management and policy development. Fri, 05 Jun 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7867-2026 Impacts of lake on diurnal evolution of surface PM2.5 concentrations around a typical megacity of China Zining Yang, Qike Yang, Chun Zhao, Zihan Xia, Qiuyan Du, Gudongze Li, Mingyue Xu, Zhiyuan Hu, Renmin Yuan, Jiawang Feng, Jun Gu, and Yubin Li Atmos. Chem. Phys., 26, 7867–7894, https://doi.org/10.5194/acp-26-7867-2026, 2026 This study uses 1 km resolution Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) simulations to investigate how Lake Chaohu affects fine particulate matter (PM2.5) in Hefei. The lake shows a diurnal reversal, increasing daytime pollution by secondary aerosol formation and storage zones with suppressed mixing and low deposition, while purifying urban air at night through enhanced vertical mixing. Lake emission treatment affects lake-urban air quality assessments. Fri, 05 Jun 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7827-2026 Synchronization of source and sink by boundary layer evolution: a key to new particle formation under varying ozone pollution Yulin Wang, Deyu Liu, Honglei Wang, Shuangshuang Shi, Qun Hu, Zihan Wang, Zirui Liu, Tianliang Zhao, and Lijuan Shen Atmos. Chem. Phys., 26, 7827–7842, https://doi.org/10.5194/acp-26-7827-2026, 2026 Atmospheric new particles formation plays an important role in air quality and climate change, but it does not always appear even in the similar situation. Using ground measurements and vertical observations, we found this process occurs only when the source increases while the sink weakens at the same time, which is mainly controlled by the development of the boundary layer. The finding helps us better understand particle formation in complex atmospheric environments. Thu, 04 Jun 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7843-2026 Long-term study of gravity wave potential energy and OH airglow emissions from 22 years of TIMED/SABER observations Toyese Tunde Ayorinde, Cristiano Max Wrasse, Luiz Fillip Rodrigues Vital, Anderson Vestena Bilibio, Gabriel Augusto Giongo, Hisao Takahashi, Cosme Alexandre Oliveira Barros Figueiredo, Maryam Akinsola, and Peter Taiwo Muka Atmos. Chem. Phys., 26, 7843–7866, https://doi.org/10.5194/acp-26-7843-2026, 2026 We analyzed 22 years of satellite observations to see how small-scale atmospheric waves and the OH emissions change across seasons and regions. Both show clear repeating patterns and are closely linked, revealing how energy moves through the upper atmosphere. These results provide a long-term baseline that can improve computer models used to study weather, climate, and atmospheric change. Thu, 04 Jun 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7803-2026 Geostationary observations of atmospheric ammonia over East Asia: spatio-temporal variations revealed by three years of FY-4B/GIIRS measurements Mengya Sheng, Runyi Zhou, Jiancong Hua, Shan Han, Shangyi Liu, Lin Zhang, Wei Wang, Ruijun Dang, Hansen Cao, Zichong Chen, Yixuan Gu, Mingxu Liu, Lu Lee, Chengli Qi, Feng Lu, Changpei Han, Mark W. Shephard, Nadir Guendouz, Camille Viatte, Lieven Clarisse, Martin Van Damme, Cathy Clerbaux, and Zhao-Cheng Zeng Atmos. Chem. Phys., 26, 7803–7826, https://doi.org/10.5194/acp-26-7803-2026, 2026 Geostationary observations of NH3 provide an unprecedented opportunity to monitor spatial and temporal variations in emissions and their evolution throughout the day. Using 3 years of observations from FY-4B/GIIRS over East Asia, we demonstrated the enhanced capability of geostationary observations to identify emission sources and capture daytime variations associated with agricultural activities. This shows the potential of future geostationary satellites for monitoring air quality globally. Wed, 03 Jun 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7789-2026 Quantifying meteorological impacts on local landfill methane emissions by using field measurements and machine learning Donghee Kim, Sujong Jeong, Dong Yeong Chang, and Jaewon Joo Atmos. Chem. Phys., 26, 7789–7802, https://doi.org/10.5194/acp-26-7789-2026, 2026 This study uses data and machine learning to better estimate methane emissions from a major landfill in South Korea. By considering local weather conditions like temperature and rain, the research improves how landfill methane is tracked over time. The results help us understand how climate affects emissions and provide tools that can be used worldwide to improve greenhouse gas monitoring and climate action planning. Tue, 02 Jun 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7765-2026 Distinct dual-isotopic signatures of major methane sources in South Asia Peng Yao, Katja Belec, Henry Holmstrand, Josh Balacky, Abdus Salam, Krishnakant Budhavant, Mohanan Remani Manoj, Khaled Shaifullah Joy, Md. Alamin Hossain, Atinderpal Singh, Anil Patel, Neeraj Rastogi, Chinmay Mallik, Kirpa Ram, Gyanesh Kumar Singh, and Örjan Gustafsson Atmos. Chem. Phys., 26, 7765–7787, https://doi.org/10.5194/acp-26-7765-2026, 2026 Methane is a powerful greenhouse gas, but its sources remain uncertain in many regions. The isotope fingerprints of methane are diagnostic of its sources, yet their source end-members are poorly constrained for South Asia. Here we determined the methane isotope signal for major sources in South Asia and found these to differ from global averages. Improved regional-specific isotope source fingerprints will help to improve top-down assessments of methane budgets and climate mitigation strategies. Tue, 02 Jun 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7677-2026 Multi-model analysis of the impact of water vapor on the radiative forcing of volcanic aerosols after the 2022 Hunga Eruption Ilaria Quaglia, Daniele Visioni, Ewa M. Bednarz, Yunqian Zhu, Georgiy Stenchikov, Valentina Aquila, Cheng-Cheng Liu, Graham W. Mann, Yifeng Peng, Takashi Sekiya, Simone Tilmes, Xinyue Wang, Shingo Watanabe, Pengfei Yu, Jun Zhang, Wandi Yu, and Zhihong Zhuo Atmos. Chem. Phys., 26, 7677–7704, https://doi.org/10.5194/acp-26-7677-2026, 2026 On January 15, 2022, the Hunga volcano eruption released unprecedented amounts of water vapor into the atmosphere alongside a modest amount of SO2. In this work we analyse results from multiple Earth system models. The models agree that the eruption led to small negative radiative forcing from sulfate aerosols and that the contribution from water vapor was minimal. Therefore, the Hunga eruption cannot explain the exceptional surface warming observed in 2023. Mon, 01 Jun 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7721-2026 Elevated anthropogenic contributions to trace elements in marine aerosols compared to coastal Qingdao in eastern China Yuxuan Qi, Wenshuai Li, Wen Qu, Haizhou Zhang, Wenqing Zhu, Jinhui Shi, Daizhou Zhang, Yanjing Zhang, Lifang Sheng, Wencai Wang, Yunhui Zhao, Yuanyuan Ma, Danyang Ren, Guanru Wu, Xinfeng Wang, Xiaohong Yao, and Yang Zhou Atmos. Chem. Phys., 26, 7721–7740, https://doi.org/10.5194/acp-26-7721-2026, 2026 To better constrain poorly resolved trace-element sources across the land-sea gradient, we applied a refined source apportionment to PM2.5 collected in Qingdao and adjacent seas in 2018. It showed that spring Fe, Mn and Cr were mainly dust-derived, although some dust aged and mixed into marine aerosol offshore. In summer, coal combustion enriched marine Zn, Pb, As and Cd, while residual oil combustion increased Fe and Mn, highlighting strong anthropogenic control on marine aerosols. Mon, 01 Jun 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7741-2026 Technical note: DACNO2 – a multi-constraint deep learning framework for high-resolution 3D NO2 field estimation Wenfu Sun, Frederik Tack, Lieven Clarisse, and Michel Van Roozendael Atmos. Chem. Phys., 26, 7741–7764, https://doi.org/10.5194/acp-26-7741-2026, 2026 Accurate maps of nitrogen dioxide pollution at fine scales are essential for assessing air quality and protecting public health. We developed a machine learning model that produces daily high-resolution 3D nitrogen dioxide fields across Western Europe by combining large-scale atmospheric simulations with ground-based measurements. This approach outperforms traditional methods, especially over cities and complex terrain, and can enhance satellite-based air quality monitoring. Mon, 01 Jun 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7705-2026 Advancing the quantification of aerosol-cloud interactions with the CALIPSO-CloudSat-Aqua/MODIS record Zhujun Li, David Painemal, Yan Feng, and Xiaojian Zheng Atmos. Chem. Phys., 26, 7705–7720, https://doi.org/10.5194/acp-26-7705-2026, 2026 This study is the first global assessment of aerosol-cloud interactions (ACI) and cloud adjustments that relies on vertically resolved aerosol retrievals that are vertically matched with the location of the cloud layer. We computed ACI metrics and cloud adjustments over the global ocean by combining retrievals from active and passive satellite sensors and found high sensitivity of clouds to changes in their cloud droplet number concentration due to aerosols. Mon, 01 Jun 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7647-2026 European HFC emissions evaluated with multiple atmospheric inverse models and UNFCCC national inventories Hélène De Longueville, Daniela B. Melo, Alison L. Redington, Alice Ramsden, Alexandre Danjou, Peter Andrews, Joseph Pitt, Brendan Murphy, Lionel Constantin, Kieran M. Stanley, Simon O'Doherty, Angelina Wenger, Dickon Young, Andreas Engel, Tanja Schuck, Katharina Meixner, Thomas Wagenhaeuser, Fides Gad, Martin K. Vollmer, Stefan Reimann, Michela Maoine, Jgor Arduini, Chris Lunder, Norbert Schmidtbauer, László Haszpra, Mihály Molnár, Arnoud Frumau, Cedric Couret, Matthew Rigby, Stephan Henne, Alistair Manning, and Anita L. Ganesan Atmos. Chem. Phys., 26, 7647–7675, https://doi.org/10.5194/acp-26-7647-2026, 2026 This study estimates emissions of hydrofluorocarbons, potent greenhouse gases, in north-western Europe using atmospheric observations and atmospheric modelling. The estimates are compared with nationally reported emissions submitted to the United Nations. Overall, our results are consistent with reported values, although differences are found for some gases and countries. The findings indicate that emissions in north-western Europe are declining, reflecting the effects of climate regulations. Mon, 01 Jun 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7555-2026 Melt period methane emissions in northern high latitude wetlands are governed by the length of the period and presence of permafrost Sara Hyvärinen, Maria K. Tenkanen, Aki Tsuruta, Anttoni Erkkilä, Kimmo Rautiainen, Hermanni Aaltonen, Motoki Sasakawa, and Tuula Aalto Atmos. Chem. Phys., 26, 7555–7587, https://doi.org/10.5194/acp-26-7555-2026, 2026 We analyzed melt period methane emissions from northern high-latitude wetlands using satellite thaw data and inverse modeling (2011–2021). Comparing region-based and grid-based approaches, we found that emissions varied with the length of the melt period, which depended on air temperature. We found spring melt period emissions ranged from 0.45 to 1.83 Tg depending on the approach, with no clear trend over the period. Our methods allow for seasonal methane monitoring across different scales. Fri, 29 May 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7523-2026 Atmospheric forcing of dust source activation across East Asia Lingle Chen, Kerstin Schepanski, Kai Zhang, Anya J. Crocker, Chuang Xuan, and Paul A. Wilson Atmos. Chem. Phys., 26, 7523–7538, https://doi.org/10.5194/acp-26-7523-2026, 2026 East Asia is among the most dust-active regions globally, yet the atmospheric processes behind these dust emissions remain poorly understood. Using an hourly dust source activation record across East Asia, we identify two primary regions with distinct diurnal cycles: a northern region driven by low-pressure systems, a southern one linked to low-level jet breakdown and deep convection, and a third minor region on the Tibetan Plateau presumably driven by wintertime mountain-valley winds. Fri, 29 May 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7407-2026 A modified stratiform cloud microphysics parameterization: evaluation using the Community Atmosphere Model version 6 single-column model Chandra Shekhar Pant, Deepak Waman, Sachin Patade, Akash Deshmukh, Niharika Singh, Vaughan Phillips, and Aaron Bansemer Atmos. Chem. Phys., 26, 7407–7433, https://doi.org/10.5194/acp-26-7407-2026, 2026 Large-scale stratiform clouds play a decisive role in the Earth's radiation budget and precipitation patterns, yet global models historically exhibit major biases in their simulations. Our study addresses these gaps by implementing physically-based representations of secondary ice production pathways and advanced aerosol activation schemes, including bin-bulk microphysics. These improvements enable the robust simulation of both cloud droplet and ice formation. Fri, 29 May 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7607-2026 Stratospheric gravity waves in three high-resolution models and AIRS satellite observations Phoebe Noble, Haruka Okui, Joan Alexander, Manfred Ern, Neil P. Hindley, Lars Hoffmann, Laura Holt, Annelize van Niekerk, Riwal Plougonven, Inna Polichtchouk, Claudia C. Stephan, Martina Bramberger, Milena Corcos, William Putnam, Christopher Kruse, and Corwin J. Wright Atmos. Chem. Phys., 26, 7607–7630, https://doi.org/10.5194/acp-26-7607-2026, 2026 Gravity waves are small-scale processes that drive the circulation in the middle and upper atmosphere. In this work, we assess 3 new high-resolution (3-5km horizontal resolution) models against satellite data. Generally, models capture the spatial patterns and represent stratospheric northern hemisphere mountain generated waves well. However, they still underestimate amplitudes globally and struggle with the representation of southern hemispheric convective waves. Fri, 29 May 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7435-2026 Effects of model grid spacing for warm conveyor belt (WCB) moisture transport into the upper troposphere and lower stratosphere (UTLS) – Part 1: Lagrangian perspective Cornelis Schwenk and Annette Miltenberger Atmos. Chem. Phys., 26, 7435–7462, https://doi.org/10.5194/acp-26-7435-2026, 2026 We studied how model grid-spacing affects how moisture and ice are carried upward in large weather systems that move warm, moist air into the upper troposphere. By comparing high- and low-resolution simulations, we found that models which are able to represent convectively ascending air produce much drier air at high altitudes. This shows that model resolution strongly influences how water and clouds are transported and how they may affect climate. Fri, 29 May 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7463-2026 G6-1.5K-SAI and G6sulfur: changes in impacts and uncertainty depending on stratospheric aerosol injection strategy in the Geoengineering Model Intercomparison Project Walker Raymond Lee, Daniele Visioni, Benjamin Moore Wagman, Christopher Robert Wentland, Ben Kravitz, Shingo Watanabe, Takashi Sekiya, Andy Jones, Jim Haywood, Matthew Henry, and Ewa Monika Bednarz Atmos. Chem. Phys., 26, 7463–7483, https://doi.org/10.5194/acp-26-7463-2026, 2026 Stratospheric aerosol injection (SAI) is a proposed method of cooling the planet by introducing reflective particles called aerosols into the middle atmosphere to reflect sunlight back into space. We consider recent simulations of SAI from four different climate models. SAI cools the planet effectively in all four models; we examine the impacts on temperature and precipitation in each model and compare to previous experiments. Our simulations will help inform future research and policy. Fri, 29 May 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7503-2026 Evaluation of ozone trends in the mesosphere/lower thermosphere using a new merged dataset of ozone profiles Monika E. Szelag, Viktoria F. Sofieva, Edward Malina, Pekka T. Verronen, Michelle L. Santee, Manuel López-Puertas, Bernd Funke, Gabriele Stiller, Alexandra Laeng, Kaley A. Walker, Patrick E. Sheese, Mark E. Hervig, and Benjamin T. Marshall Atmos. Chem. Phys., 26, 7503–7522, https://doi.org/10.5194/acp-26-7503-2026, 2026 We present a new global dataset of ozone profiles in the mesosphere and lower thermosphere, created by combining several satellite measurements covering more than three decades. Our results show that ozone is recovering in the stratosphere but decreasing in the mesosphere, with the strongest declines near the mesopause. This dataset provides a valuable resource for investigating long-term changes, improving model performance, and addressing an observational gap in the upper atmosphere. Fri, 29 May 2026 09:51:25 +0200 https://doi.org/10.5194/acp-26-7589-2026 Efficacy assessment of stratospheric aerosol scrubbing as a counter climate intervention strategy Anthony C. Jones, James M. Haywood, Matthew Henry, and Alistair Duffey Atmos. Chem. Phys., 26, 7589–7605, https://doi.org/10.5194/acp-26-7589-2026, 2026 Injecting aerosol into the stratosphere has been suggested to rapidly cool the planet and counter climate change. Rival actors who oppose deployment may seek to counter stratospheric aerosol injection. Using a climate model, we investigate whether stratospheric aerosol removal could be hastened by injecting coarse aerosol which promote aerosol growth and gravitational settling. We find that this could be effective, reducing aerosol impacts by 30 % in simulations, and warrants further research. Fri, 29 May 2026 09:51:25 +0200