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-26-14229-2026 Light absorption properties and composition of water-soluble brown carbon in North China Plain: implication for an enhancing role of nitrogenous organic compounds Can Wu, Huijun Zhang, Kehan Sun, Rongjie Li, Ziting Yan, Yubao Chen, Zheng Li, Binyu Xiao, Yanqin Ren, and Gehui Wang Atmos. Chem. Phys., 26, 14229–14243, https://doi.org/10.5194/acp-26-14229-2026, 2026 Nitrogenous organic compounds represent the pivotal chromophores governing the optical properties of atmospheric brown carbon (BrC) across the North China Plain, which are mainly formed through ammonia-driven aqueous reactions. Accordingly, the mitigation of ammonia emissions is indispensable for the further abatement of haze and BrC pollution in this region. Fri, 09 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-14133-2026 Forest and bioenergy expansion amplifies climate warming by accelerating regional cloud loss Nanjian Liu, Zhixin Hao, Siyou Xia, and Peng Zhao Atmos. Chem. Phys., 26, 14133–14163, https://doi.org/10.5194/acp-26-14133-2026, 2026 Planting trees and biofuel crops stores carbon to fight climate change, but using a climate model we found large-scale versions surprisingly speed up loss of cooling low clouds and boost warming high clouds, worsening northern warming, while realistic planting often slows loss and can cool slightly – showing benefits depend on location and scale, so careful choices are key. Fri, 09 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-14165-2026 Chemical characterization and source apportionment of PM10 in Belgrade, Serbia: influence of local and regional anthropogenic and natural sources Bojana Petrović, Andres Alastuey, Karl Espen Yttri, Marco Pandolfi, Maja Jovanović, Bojan Radović, Renata Kovačević, Danka B. Stojanović, Miloš Davidović, Stephen M. Platt, Alena Bartonova, and Milena Jovašević-Stojanović Atmos. Chem. Phys., 26, 14165–14184, https://doi.org/10.5194/acp-26-14165-2026, 2026 Source apportionment based on daily levels of organic and elemental carbon, metals, ions, and organic tracers identified 7 factors, interpreted as anthropogenic and natural sources at both regional and local scales. Mitigation measures would reduce the biomass burning factor, which contributes 21 % to airborne particulate matter annually, primarily during the heating season. Two biogenic factors account for 20 %, the remaining 4 factors are influenced by both anthropogenic and natural sources. Fri, 09 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-14111-2026 Estimating Twomey forcing sensitivity to aerosol plume spreading rates Lucas A. McMichael, Ehsan Erfani, Robert Wood, and Knut von Salzen Atmos. Chem. Phys., 26, 14111–14132, https://doi.org/10.5194/acp-26-14111-2026, 2026 This study explores how aerosol plumes spread in marine clouds and how that affects cloud brightening. Changes in turbulence strongly affect plume spreading rates, but have little effect on the overall brightening in the cases studied. The main uncertainties are aerosol lifetime and how clouds adjust to the aerosols. Climate models often assume that plumes spread instantly, and we find that this may overestimate cooling in some cases. Fri, 09 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-14185-2026 NeuPlume: generative inversion of atmospheric point-source emissions from sparse observations Lei Wang and Xin Ma Atmos. Chem. Phys., 26, 14185–14203, https://doi.org/10.5194/acp-26-14185-2026, 2026 Estimating greenhouse gas emissions from a single source is difficult when only a few air measurements are available. We developed NeuPlume, a method that combines atmospheric simulation with machine learning to estimate the emission rate and its uncertainty. Tests with simulated plumes and drone methane measurements show that it can give more realistic estimates and identify when wind information or flight coverage limits confidence. Fri, 09 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-14205-2026 Physics-constrained transfer learning with a spectral-fidelity-preserving model for satellite remote sensing applications Min Min, Qiang Yu, Jun Li, Han Lin, Yunheng Xue, Xinran Xia, Di Di, Bo Li, and Peng Zhang Atmos. Chem. Phys., 26, 14205–14228, https://doi.org/10.5194/acp-26-14205-2026, 2026 A physics‑constrained transfer learning framework enables accurate radiance transformation across satellite sensors with different spectral response functions (SRFs). It integrates a Spectral‑Fidelity‑Preserving model from radiative transfer. Tests confirm robustness to calibration uncertainties and define SRF constraints. FY‑4A/B application improves cloud and precipitation retrievals, enabling operational algorithm transfer. Fri, 09 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-14085-2026 EarthCARE reveals details on the role of rain in closed-to-open cell transitions Johanna Mayer, Daniele Gasbarra, Robin J. Hogan, Edward Malina, Shannon L. Mason, and Blanka Piskala Gvozdikova Atmos. Chem. Phys., 26, 14085–14110, https://doi.org/10.5194/acp-26-14085-2026, 2026 We investigate transitions from closed to open stratocumulus cells using synergistic observations from the EarthCARE and GOES satellites. Microphysical changes and increasing rain up to 25 hours before transitions support a precipitation-driven pathway. These findings provide new observational constraints on the processes driving stratocumulus breakup and its radiative impact. Thu, 08 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-14073-2026 Isotopic composition of aerosol iron from anthropogenic sources: implications for source apportionment of aerosol iron Yifan Zhang, Guanhong Zhu, Rui Li, Mingyuan Liu, Yi Yang, Tianyu Zhang, Yizhu Chen, Jinlong Ma, Xinming Wang, and Mingjin Tang Atmos. Chem. Phys., 26, 14073–14084, https://doi.org/10.5194/acp-26-14073-2026, 2026 This work measured isotopic compositions for aerosol Fe from desert dust and several anthropogenic sources. We revealed large variability in the Fe isotopic endmember values both among and within different anthropogenic aerosols, and found that not all the anthropogenic aerosol Fe is isotopically lighter than natural dust Fe. Thu, 08 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-14051-2026 Constraints on NOx emission in Thailand using GEMS satellite data Worapop Thongsame, Daven K. Henze, Gabriele Pfister, Rajesh Kumar, and Mary Barth Atmos. Chem. Phys., 26, 14051–14072, https://doi.org/10.5194/acp-26-14051-2026, 2026 Air pollution from nitrogen oxides threatens human health in Thailand. We used a brand new geostationary satellite (GEMS) to measure air pollution and update emissions for modeling in Thailand. Our updated emissions improve model performance compared to other satellites. Additionally, our work reveals data inconsistencies in North Thailand between two satellites. This shows the potential of geostationary satellites and the requirement for calibration and bias correction. Wed, 07 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-13959-2026 Driving mechanisms for subsiding shells in simulations of deep moist convection Quinlan R. Mulhern, John M. Peters, and Jake P. Mulholland Atmos. Chem. Phys., 26, 13959–13982, https://doi.org/10.5194/acp-26-13959-2026, 2026 Thunderstorms redistribute air throughout the lowest layer of the atmosphere. One way in which this occurs is when air descends around the edges of clouds, known as a subsiding shell. By studying computer simulations, we found that the shells were formed by droplets evaporating at the cloud edge and air being forced downward at cloud top by pressure differences. Larger pressure differences and accelerations were found in the dry environment because updrafts were stronger in that simulation. Tue, 06 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-13929-2026 Fire carbon emission constraints from space-based carbon monoxide retrievals during the 2019 intense burning season in Brazil Anne-Wil van den Berg, Joram J. D. Hooghiem, Auke M. van der Woude, Pieter Rijsdijk, Roland Vernooij, Santiago Botía, Guido R. van der Werf, John B. Miller, Ingrid T. Luijkx, Maarten C. Krol, and Wouter Peters Atmos. Chem. Phys., 26, 13929–13958, https://doi.org/10.5194/acp-26-13929-2026, 2026 We estimate 2019 Brazilian fire carbon monoxide (CO) emissions using CO retrievals from multiple satellites in a new top-down inversion framework. The retrievals strongly constrain fire emissions and complement existing inventories. National-scale posterior emissions align well with the new Global Fire Emissions Database v5.1, supporting progress in fire emission models. Yet, posterior emissions in the Cerrado and Caatinga are systematically higher than inventories; we discuss potential drivers. Tue, 06 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-14031-2026 Tropical belt expansion and its impacts on climate variability in the Mediterranean from 1980 to 2022 Mohamed Darrag, Shuanggen Jin, Andrés Calabia, Aalaa Samy, Ivan Radevski, and Ali M. Radwan Atmos. Chem. Phys., 26, 14031–14050, https://doi.org/10.5194/acp-26-14031-2026, 2026 This study examines the variability of climatic parameters over the Mediterranean and their teleconnection with tropical belt expansion. The results exhibit a dominant upward trend of tropopause height, with maximum trends in the eastern Mediterranean region, which shows more poleward occurrences of tropical edge latitudes. The analysis confirms the link between climatic parameter variability and tropical edge latitude occurrences. Tue, 06 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-13983-2026 Impacts of mesoscale atmospheric subsidence on cloud glaciation and decoupling in Arctic marine cold air outbreaks Fiona Paulus, Joshua J. Müller, Benjamin Kirbus, Harald Sodemann, Lars van Gelder, Andreas Walbröl, Manfred Wendisch, and Roel A. J. Neggers Atmos. Chem. Phys., 26, 13983–14014, https://doi.org/10.5194/acp-26-13983-2026, 2026 Cold Arctic air flowing from sea ice onto the warmer ocean waters rapidly warms, moistens, and forms clouds and precipitation. These events shape the Arctic climate but are difficult to observe and model. Particularly the role of large-scale sinking motion during these events is not fully understood. Using rare aircraft data and simulations to track an air mass for two days, we show that strong downward motion suppresses cloud growth, limits and delays precipitation, and reduces cloud lifetimes. Tue, 06 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-14015-2026 Cross-phase partitioning of sulfur-nitrogen ratios and aerosol mixing-state evolution based on single-particle observations Yuan Dai, Junfeng Wang, Mindong Chen, Su Zhang, Haiwei Li, Yunjiang Zhang, Yun Wu, Ming Wang, and Xinlei Ge Atmos. Chem. Phys., 26, 14015–14029, https://doi.org/10.5194/acp-26-14015-2026, 2026 Air pollution involves complex interactions between airborne particles and gases, but these links are not fully understood. We analyzed individual particles and gases across different emission levels. We found that relative sulfur and nitrogen levels influence how gases interact with particles and alter their properties. These processes vary by particle type and humidity, helping explain how pollution forms and evolves. Our findings provide new evidence for particle-gas interactions. Tue, 06 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-13885-2026 Synthesis of the tethered balloon system and other TRACER campaign measurements elucidates aerosol property profiles Fan Mei, Jian Wang, Israel Silber, Nurun Nahar Lata, Gregory W. Vandergrift, Jing Li, Bo Chen, Sarah D. Brooks, Michael P. Jensen, Min Deng, Damao Zhang, Darielle Dexheimer, Beat Schmid, Zezhen Cheng, and Swarup China Atmos. Chem. Phys., 26, 13885–13908, https://doi.org/10.5194/acp-26-13885-2026, 2026 Tethered balloon measurements from 149 flights during DOE ARM TRACER over Houston characterize vertical aerosol and CCN structure. Back-trajectory clustering identifies three air mass types – marine, mixed, and urban – with distinct profiles shaped by boundary-layer depth and coastal circulations. A case study shows mesoscale advection simultaneously transforms thermodynamic and aerosol conditions, underscoring the need to constrain meteorology before attributing cloud changes to aerosol forcing. Mon, 05 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-13861-2026 Sensitivity of dynamic aging on the climate effects of black carbon aerosols over East Asia in summer Peng Gao, Bingliang Zhuang, Yaxin Hu, Yinan Zhou, Runqi Zhao, Qianqian Wang, Shu Li, Tijian Wang, Mengmeng Li, and Min Xie Atmos. Chem. Phys., 26, 13861–13884, https://doi.org/10.5194/acp-26-13861-2026, 2026 In this study, we incorporate a dynamic black carbon (BC) aerosols aging scheme into a regional climate model to assess the BC climate effects over East Asia during summer. Results indicate that variations in the aging rate can substantially influence BC loadings and their optical and physical properties. Furthermore, BC radiative forcing and regional climate responses are further evaluated, providing deeper insights into the interactions between air pollution and climate change in East Asia. Mon, 05 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-13909-2026 Consistent estimates of carbonyl sulfide and methane stratospheric lifetimes retrieved from AirCore profiles at different latitudes Alessandro Zanchetta, Steven van Heuven, Rigel Kivi, Michel Ramonet, Andreas Engel, Maarten Krol, and Huilin Chen Atmos. Chem. Phys., 26, 13909–13927, https://doi.org/10.5194/acp-26-13909-2026, 2026 In this study, we calculate the mean lifetime of carbonyl sulfide (COS) and methane (CH4) in the stratosphere from continuous vertical profiles sampled with balloon-borne instruments. We used two methods based on the stratospheric relationship of these gas species with N2O. The estimated stratospheric lifetime range is 69–90 years for COS and 146–172 years for CH4. These results are consistent with other studies and suggest no long-term trends in the stratospheric lifetime of these gas species. Mon, 05 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-13845-2026 The impact of orography on the troposphere-to-stratosphere transport during a typhoon event in the tropics Massimo Martina, Anahí Villalba-Pradas, Šimon Bartoň, and Petr Šácha Atmos. Chem. Phys., 26, 13845–13860, https://doi.org/10.5194/acp-26-13845-2026, 2026 Our work presents a previously undocumented mechanism for stratosphere-troposphere exchange, which is triggered by the interaction of typhoons with the underlying orography. This interaction induces the rapid and efficient transport of emissions from the boundary layer to the tropical tropopause and stratosphere. Our study has significant implications for the development of climate models in terms of parameterization schemes and for our understanding of pollution transport in tropical regions. Fri, 02 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-13817-2026 Uncertainties in recent tropical stratospheric and tropospheric ozone changes limit the use of observational constraints for assessing future ozone change Sean M. Davis, William T. Ball, Yue Jia, Gabriel Chiodo, Justin A. Alsing, James Keeble, Hideharu Akiyoshi, Carlo Arosio, Ewa M. Bednarz, Andreas Chrysanthou, Melanie Coldewey-Egbers, Robert Damadeo, Sandip Dhomse, Mohamadou A. Diallo, Simone Dietmuller, Roland Eichinger, Stacey Frith, Birgit Hassler, Michaela I. Hegglin, Daan Hubert, Patrick Jöckel, Béatrice Josse, Natalya Kramarova, Diego Loyola, Eliane Maillard Barras, Marion Marchand, Olaf Morgenstern, David Plummer, Robert W. Portmann, Karen H. Rosenlof, Alexei Rozanov, Viktoria F. Sofieva, Johannes Staehelin, Timofei Sukhodolov, Kleareti Tourpali, Ronald J. Van der A, H. J. Ray Wang, Krzysztof Wargan, Shingo Watanabe, Mark Weber, Jeannette D. Wild, Yousuke Yamashita, and Jerry Ziemke Atmos. Chem. Phys., 26, 13817–13843, https://doi.org/10.5194/acp-26-13817-2026, 2026 This study investigates tropical ozone changes in models and satellite observations to determine how well they agree and whether observations can constrain model projections. At some levels, satellite records disagree significantly on the magnitude of ozone changes. While early and late 21st century trends are correlated across models, suggesting a potential emergent constraint, the spread in observations means they are unable to provide guidance on the credibility of model projections. Fri, 02 Oct 2026 21:15:31 +0200 https://doi.org/10.5194/acp-26-13795-2026 Assessing ozone dynamics during the 2023 summer STAQS field campaign using synergistic observations and model simulations Claudia M. Bernier, Matthew S. Johnson, John Sullivan, Guillaume Gronoff, Daniel Phoenix, Fred Moshary, Raul Alvarez, Brandi McCarty, Andrew Langford, Christoph Senff, Sunil Baidar, and Laura Judd Atmos. Chem. Phys., 26, 13795–13816, https://doi.org/10.5194/acp-26-13795-2026, 2026 To investigate ozone pollution in a complex coastal urban environment, we combined NASA's Tropospheric Emissions: Monitoring of Pollution (TEMPO) satellite observations with aircraft, ground, and lidar measurements from the 2023 Synergistic TEMPO Air Quality Science (STAQS) campaign in the NYC–Long Island Sound region. We evaluated TEMPO's ability to capture ozone precursor variability and analyzed how meteorology and precursor transport drive day-to-day ozone changes. Fri, 02 Oct 2026 21:15:31 +0200