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Session Proposal: General Session: Atmospheric Chemistry and Composition (AGU25)

A060
General Session: Atmospheric Chemistry and Composition

Session ID#: 250409

Session Description:
The composition of the atmosphere is determined by emissions, chemical transformations, transport, and removal. Emissions can be natural and man-made and include thousands of different compounds. Chemical transformations occur on time scales ranging from seconds to centuries. Transport on local, regional, and global scales determines the geographic extent of the impact of emissions on atmospheric composition. Deposition is an important removal mechanism for many compounds that is not well understood. Describing all of these processes is important because changes in atmospheric composition affect many issues of societal importance including air quality, the stratospheric ozone layer, climate, and ecosystem function and health.This session provides a general forum for scientists working on Atmospheric Chemistry and Composition. We welcome new research (field work, laboratory studies, modeling, data analysis, etc.) that does not fall under the umbrella of other sessions, as well as reviews and perspectives on important areas of study.
Index Terms:

0317 Chemical kinetic and photochemical properties [ATMOSPHERIC COMPOSITION AND STRUCTURE]
0340 Middle atmosphere: composition and chemistry [ATMOSPHERIC COMPOSITION AND STRUCTURE]
0345 Pollution: urban and regional [ATMOSPHERIC COMPOSITION AND STRUCTURE]
0365 Troposphere: composition and chemistry [ATMOSPHERIC COMPOSITION AND STRUCTURE]
Primary Convener:  Ross J Salawitch, University of Maryland College Park, College Park, MD, United States
Conveners:  Victoria P. Barber, University of California Los Angeles, Chemistry and Biochemistry, Los Angeles, United States and David M Wilmouth, Harvard University, Cambridge, United States
 
Climate and land use impacts on soil hydrogen sink in the 21st century (1869822)
Anthony Y.H. Wong, Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, Cambridge, MA, United States and C Adam Schlosser, Massachusetts Institute of Technology, MIT Center for Sustainability Science and Strategy, Cambridge, United States
 
Addressing UTLS water vapor data gaps with water vapor sondes and radiosondes (1875592)
Elizabeth Asher1,2, Bradley Boyadjiev3, Alex Fritz1 and Emrys Hall2, (1)Cooperative Institute for Research in Environmental Sciences, Boulder, United States, (2)NOAA Global Monitoring Laboratory, Boulder, United States, (3)University of South Florida Tampa, Tampa, United States
 
Source apportionment of PM2.5 based on long-term chemical components analyses in Karlsruhe, southwest Germany (2011-2019) (1886929)
Xiao Wang1, Elisabeth Eiche2 and Stefan Norra1, (1)Potsdam University, Potsdam, Germany, (2)KIT - Karlsruhe Institute for Technology, South Campus, Karlsruhe, Germany
 
Unraveling chemical structures of organic aerosols from diverse biomass sources through a year-long offline source apportionment in Hyytiälä, Finland (1888804)
Qianzhe Sun1, Ruichen Zhou2, Sho Ohata3, Chiaki Shirota4, Tuukka Petäjä5, Lauri Ahonen6, Markku Tapio Kulmala7 and Michihiro Mochida3, (1)Nagoya University, Graduate School of Environmental Studies, Nagoya, Japan, (2)Nagoya University, Institute for Space-Earth Environmental Research, Nagoya, Japan, (3)Nagoya University, Nagoya, Japan, (4)Murata Keisokuki Service Co., Ltd, Yokohama, Japan, (5)University of Helsinki, Helsinki, Finland, (6)University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)/ Physics, Helsinki, Finland, (7)University of Helsinki, Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, Helsinki, Finland
 
Comparison of Influencing Factors on Inorganic Aerosol pH and Its Buffering Capacity between Urban and Rural Atmospheres in South Korea during Summertime (1888923)
Eunsang Na1, Tien Van Do2, Kwangyul Lee3, Jeeyong Ham4, Hyungdo Song4, Chul Yoo4 and Mijung Song1,2, (1)Department of Environment and Energy, Jeonbuk National University, Jeonju-si, Jeollabuk-do 54896, South Korea, (2)Department of Earth and Environment Sciences, Jeonbuk National University, Jeonju-si, Jeollabuk-do 54896, South Korea, (3)Department of Climate and Air Quality Research, National Institute of Environmental Research, Incheon 22689, South Korea, (4)Division of Climate And Air Quality Research, National Air Emission Inventory and Research Center, Cheongju-si, Chungcheongbuk-do 28166, South Korea
 
Simulating Present and Future PM2.5 Composition Over India: Evaluating Emissions and Meteorological Influences Using WRF-Chem (1888969)
Mukul Kumar, Dilip Ganguly and Sagnik Dey, Indian Institute of Technology Delhi, Centre for Atmospheric Sciences, New Delhi, India
 
Unravelling the Size-Dependent Formation Pathways and Light Absorption of Secondary Organic Aerosols in Inland and Coastal Indian Cities (1891765)
Yasarapu Sathish, Indian Institute of Technology Bombay, Mumbai, India and Abhishek Chakraborty, Indian Institute of Technology Bombay, Environmental Science and Engineering Department, Mumbai, India
 
Assessing the Feasibility and Uncertainties in Constraining Primary OH Production from Space (1895185)
Daniel C Anderson, University of Maryland Baltimore County, Baltimore, MD, United States, Junhua Liu, Harvard Univ, Cambridge, MA, United States and Amir Souri, Center for Astrophysics | Harvard & Smithsonian, Cambridge, United States
 
Linking Laboratory Observations to Chemical Mechanisms: A Framework for VOC Oxidation Evaluation (1900214)
Jia Jiang1, Lesly Franco2, Erik Helstrom1, Nadia Tahsini3 and Jesse H Kroll1, (1)Massachusetts Institute of Technology, Civil and Environmental Engineering, Cambridge, MA, United States, (2)Massachusetts Institute of Technology, Earth, Atmospheric, and Planetary Sciences, Cambridge, MA, United States, (3)Massachusetts Institute of Technology, Chemical Engineering, Cambridge, United States
 
Global Ocean Data Set of Marine Aerosol Properties (1900981)
Patricia Quinn, NOAA Pacific Marine Environmental Laboratory, Seattle, WA, United States, Timothy S Bates, NOAA PMEL, Seattle, United States, Derek J Coffman, NOAA/PMEL, Seattle, WA, United States, Lucia Upchurch, Atmospheric Chemistry Group & TPOS 2020 project, University of Washington/JISAO & NOAA/PMEL, Seattle, WA 98115, Seattle, WA, United States and James E Johnson, NOAA PMEL, Seattle, WA, United States
 
Graph Theory-Based Insights into Atmpsheric Chemical Mechanisms (Invited) (1902075)
Sam James Silva1, Obin Sturm2, Daniel Getter2 and Emy Li3, (1)University of Southern California, Earth Sciences & Civil and Environmental Engineering, Los Angeles, CA, United States, (2)University of Southern California, Earth Sciences, Los Angeles, United States, (3)University of Southern California, Los Angeles, CA, United States
 
Peroxyacetyl Nitrate at Central China’s Highest Mountain (Mt. Shennongjia): Unexpected Net Production and Implications for Ozone Formation (1903781)
Haibin Huang1, HongYong Li1, Hairong Cheng2, Likun Xue3 and Dr. XiaoPu Lyu, PhD1, (1)Hong Kong Baptist University, Kowloon Tong, Hong Kong, (2)Wuhan University, Wuhan, China, (3)Shandong University, Qingdao, China
 
Does lightning directly make more hydroxyl than you think it does? (1904227)
William H Brune1, Patrick McFarland2 and Jena Jenkins1, (1)Pennsylvania State University Main Campus, University Park, PA, United States, (2)Pennsylvania State University Main Campus, University Park, United States
 
Investigation of elevated wintertime nitrate events at Mammoth Cave and Great Smoky Mountains National Parks (1904509)
Jihee Ban1, Taehyun Park2, Amy Sullivan1, Andrey Marsavin1, Yong Zhou1, Bret A Schichtel3, Anthony J Prenni3, Johnathan Jernigan4, Jim Renfro5, Taehyoung Lee6 and Jeffrey Lee Collett Jr1, (1)Colorado State University, Department of Atmospheric Science, Fort Collins, United States, (2)Colorado State University, Department of Chemistry, Fort Collins, United States, (3)National Park Service, Air Resources Division, Denver, CO, United States, (4)National Park Service, Air Resources Division and Cumberland Piedmont Network, Mammoth Cave, Kentucky, United States, (5)National Park Service, Great Smoky Mountains National Park, Tennessee, United States, (6)Department of Environmental Science, Hankuk University of Foreign Studies, Yongin 17035, South Korea
 
Contributions of Lightning to Long-term Trends and Inter-annual Variability in Global Atmospheric Chemistry Constrained by Schumann Resonance Observations (1904752)
Xiaobo Wang1, Yuzhong Zhang2, Tamás Bozóki3, Ruosi Liang2, Xinchun Xie2, Shutao Zhao2, Rui Wang2, Yujia Zhao2 and Shuai Sun2, (1)Organization Not Listed, Washington, DC, United States, (2)Westlake University, Hangzhou, China, (3)HUN-REN Institute of Earth Physics and Space Science, Sopron, Hungary
 
Inferring Drivers of Tropical Isoprene: Competing Effects of Emissions and Chemistry (1905321)
James (Young Suk) Yoon1, Kelley C Wells2, Dylan B Millet2, Christian Frankenberg3, Suniti Sanghavi4, Abigail L. S. Swann5, Joel A Thornton6 and Alexander J Turner6, (1)University of Washington, Atmospheric and Climate Science, Seattle, United States, (2)University of Minnesota Twin Cities, Department of Soil, Water, and Climate, St. Paul, United States, (3)NASA Jet Propulsion Laboratory, Pasadena, United States, (4)Jet Propulsion Laboratory, Pasadena, CA, United States, (5)University of Washington, Department of Atmospheric and Climate Science and Department of Biology, Seattle, United States, (6)University of Washington, Department of Atmospheric and Climate Science, Seattle, United States
 
Examining Air Quality Change during COVID-19 in Delhi from Ground-based Observations and Regional Meteorology-Chemistry model Simulations (1905565)
Ping Pui Ching, The Education University of Hong Kong, Hong Kong, Hong Kong, Mizuo Kajino, Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan and Sachiko Hayashida, Nara Women's University, Nara, Japan
 
Trend and Uncertainty Analysis of Reactive Mercury in the Atmosphere (1907143)
Jan Gacnik1, Aryeh Feinberg2,3, Eric Roy4, Andrei Ryjkov5, Ashu Dastoor5 and Oleg Travnikov1, (1)Jozef Stefan Institute, Meteorological Synthesizing Centre /East (MSC-E), Department of Environmental Sciences, Ljubljana, Slovenia, (2)Massachusetts Institute of Technology, Institute for Data, Systems, and Society, Cambridge, United States, (3)Institute of Physical Chemistry Blas Cabrera, CSIC, Department of Atmospheric Chemistry and Climate, Madrid, Spain, (4)Massachusetts Institute of Technology, Department of Earth, Atmospheric and Planetary Sciences, Boston, United States, (5)Environment and Climate Change Canada, Air Quality Research Division, Dorval, QC, Canada
 
Summary and first results from the Colorado Front Range OZone Éxperiment (FROZÉ 2025) (1913947)
Andrey Marsavin1, Amy Sullivan2, Yong Zhou2, Jared Stickney2, Jihee Ban2, Daniela Guevara2, Brandon McGuire2, Matthew Davis2, Emily V Fischer2, Jeffrey Lee Collett Jr2, Barkley C Sive3, Wade Permar4, Emily Cope5, Damien Ketcherside5, Lu Hu6, Erick Mattson7, Alicia Frazier7 and Tom Moore8, (1)Colorado State University, Atmospheric Science, Fort Collins, United States, (2)Colorado State University, Department of Atmospheric Science, Fort Collins, United States, (3)National Park Service Colorado, Air Resources Division, Denver, United States, (4)University of Montana, Department of Chemistry and Biochemistry, Missoula, MT, United States, (5)University of Montana, Department of Chemistry and Biochemistry, Missoula, United States, (6)Univ of MN-Soil, Water, & Clim, St. Paul, United States, (7)Colorado Department of Public Health and Environment, Denver, United States, (8)Regional Air Quality Council, Denver, United States
 
Preliminary Data Analysis of the 2023 Boeing ecoDemonstrator Explorer SAF Emissions and Contrail Project (1917933)
Rose Miller1, Steven L Baughcum2, Timothy Rahmes3, William Griffin3, Colin Tully4, Richard Moore5, Richard C. Miake-Lye6, Christiane Voigt7, Daniel N Sauer8, Raphael Märkl7, Rebecca K Dischl7, Anke Roiger9, Tiziana Bräuer7, George Dalakos10 and Cassandra Miller11, (1)Boeing Company Seattle, Seattle, WA, United States, (2)Boeing Company, Redmond, United States, (3)Boeing Company Seattle, Seattle, United States, (4)Boeing Research & Technology, Huntsville, United States, (5)NASA Langley Research Center, Hampton, VA, United States, (6)Aerodyne Research Inc., Billerica, MA, United States, (7)German Aerospace Center (DLR), Institute of Atmospheric Physics, Oberpfaffenhofen, Germany, (8)German Aerospace Center (DLR) Oberpfaffenhofen, Institute of Atmospheric Physics, Wessling, Germany, (9)German Aerospace Center DLR Oberpfaffenhofen, Institute of Atmospheric Physics, Oberpfaffenhofen, Germany, (10)General Electric Aerospace Research, Niskayuna, NY, UNITED STATES, (11)GE Aerospace, Evendale, United States
 
First Airborne VOC Measurements Using Thermal Infrared Remote Sensing: Mapping Fire Plumes with the Scanning High-Resolution Infrared Sounder (1918839)
Chengyuan Hu1, Dylan B Millet1, Kelley C Wells1, Jared Brewer1, Julieta Juncosa1, Vivienne Payne2, Joe K Taylor3 and David C. Tobin3, (1)University of Minnesota Twin Cities, Department of Soil, Water, and Climate, St. Paul, United States, (2)NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, United States, (3)University of Wisconsin Madison, Space Science and Engineering Center, Madison, WI, United States
 
Human Influence on the Ozone Layer Detectable by the 1960s (1930868)
Jian Guan1, Susan Solomon2, Gabriel Chiodo3, Arlene M Fiore4, Qiang Fu5, Rolando R Garcia6, Douglas Edward Kinnison7, Jean-Francois Lamarque8, Yaowei Li1, Benjamin D Santer9,10, Kane Stone1, Peidong Wang11 and Jun Zhang7, (1)Massachusetts Institute of Technology, Cambridge, MA, United States, (2)MIT/EAPS, Cambridge, MA, United States, (3)ETH Swiss Federal Institute of Technology Zurich, Institute for Atmospheric and Climate Science, Zurich, Switzerland, (4)Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, Cambridge, United States, (5)University of Washington, Seattle, United States, (6)Natl Ctr Atmospheric Research, Boulder, CO, United States, (7)NCAR, Boulder, United States, (8)SilverLining, Boulder, United States, (9)University of California Los Angeles, Joint Institute for Regional Earth System Science & Engineering, Los Angeles, United States, (10)Woods Hole Oceanographic Institution, Physical Oceanography, Woods Hole, United States, (11)Massachusetts Institute of Technology, Cambridge, United States
 
Enhanced atmospheric N2O5-ClNO2 chemistry in Delhi: driving factors and implications for PM2.5 pollution (1933543)
Yijing Chen1, Epameinondas Tsiligiannis2, Jan Pettersson2, Mattias Hallquist2, Cheng Wu2 and Jingkun Jiang1, (1)Tsinghua University, State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing, China, (2)University of Gothenburg, Department of Chemistry, Atmospheric Science, Gothenburg, Sweden
 
Impacts of iodine on the atmospheric oxidation of elemental mercury (Hg0) (1941636)
Aryeh Feinberg1, John M C Plane2, David Catalan Fenollosa3, Javier Carmona-Garcia4, A. Ulises Acuña1, Carlos Cuevas1, Rafael P. Fernandez5, Daniel Roca-Sanjuán3, Joseph Francisco6, Jeroen Sonke7 and Alfonso Saiz-Lopez1, (1)Institute of Physical Chemistry Blas Cabrera, CSIC, Department of Atmospheric Chemistry and Climate, Madrid, Spain, (2)University of Leeds, School of Chemistry, Leeds, United Kingdom, (3)Universitat de València, Institut de Ciència Molecular, Valencia, Spain, (4)University of Bristol, Centre for Computational Chemistry, School of Chemistry, Bristol, United Kingdom, (5)National Research Council (ICB-CONICET), Institute for Interdisciplinary Science, Mendoza, Argentina, (6)University of Pennsylvania, Department of earth and environmental science, Philadelphia, United States, (7)CNRS/OMP/Université de Toulouse, Géosciences Environnement Toulouse, Toulouse, France
 
TropOx: An aircraft measurement based project to investigate tropical oxidation capacity (1943441)
James D Lee, University of York, Wolfson Atmospheric Chemistry Laboratories, York, YO10, United Kingdom
 
Ozone (O3) Observations in Saxony, Germany: Trends and Insights from Photochemical Modelling (1945841)
Yaru Wang, Dominik van Pinxteren, Andreas Tilgner, Erik H. Hoffmann, Max Hell and Hartmut Herrmann, Leibniz Institute for Tropospheric Research (TROPOS), Atmospheric Chemistry Department (ACD), Leipzig, Germany
 
The Global Hydrogen Budget (1953068)
Zutao Yang1, Robert B Jackson2, Marielle Saunois3, Josep Gili Canadell4, Yuanhong Zhao5, Catherine Morfopoulos6, Paul B Krummel7, Prabir Kumar Patra8, Glen P Peters9, Fraser Dennison10, Thomas Gasser11, Alexander T Archibald12, Vivek Arora13, Gabriel Baudoin14, Naveen Chandra15, Philippe Ciais16, Steven Davis17, Sarah Feron18, Fangzhou Guo19, Didier Hauglustaine20, Chris Jones21, Matthew William Jones22, Etsushi Kato23, Daniel Kennedy24, Juergen Knauer25, Sebastian Lienert26, Danica L. Lombardozzi27, Joe R Melton28, Julia Nabel29, Michael O'Sullivan30, Gabrielle Petron31, Benjamin Poulter32, Joeri Rogelj11, David P Sandoval Calle6, Pete Smith33, Parvadha Suntharalingam22, Hanqin Tian34, Chenghao Wang17 and Andy Wiltshire21, (1)Stanford University, Stanford, CA, United States, (2)Stanford University, Earth System Science, Stanford, United States, (3)LSCE Laboratoire des Sciences du Climat et de l'Environnement, Gif-Sur-Yvette Cedex, France, (4)CSIRO Environment, Canberra, Australia, (5)Ocean University of China, Qingdao, China, (6)Imperial College London, Ascot, United Kingdom, (7)CSIRO, Aspendale, Australia, (8)Center for Environmental Remote Sensing, Chiba University, Chiba, Japan, (9)Center for International Climate and Environmental Research Oslo, Oslo, Norway, (10)CSIRO Environment, Aspendale, Australia, (11)IIASA International Institute for Applied Systems Analysis, Laxenburg, Austria, (12)University of Cambridge, Centre for Atmospheric Science, Yusuf Hamied Department of Chemistry, Cambridge, United Kingdom, (13)Environment and Climate Change Canada, Canadian Centre for Climate Modelling and Analysis, Victoria, BC, Canada, (14)International Institute for Applied Systems Analysis, Laxenburg, Austria, (15)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan, (16)Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris Saclay, Gif-Sur-Yvette, France, (17)Stanford University, Department of Earth System Science, Stanford, United States, (18)University of Groningen, Climate Change and Energy Transition, Campus Fryslân, Groningen, Netherlands, (19)Aerodyne Research Inc., Billerica, United States, (20)Laboratoire des Sciences du Climat et de l’Environnement, CEA-CNRS-UVSQ, UMR8212, Gif-Sur-Yvette, France, (21)Met Office Hadley Centre, Exeter, United Kingdom, (22)University of East Anglia, Norwich, United Kingdom, (23)National Institute for Environmental Studies, Tsukuba, Japan, (24)National Center for Atmospheric Research, Boulder, CO, United States, (25)University of Technology Sydney, School of Life Sciences, Faculty of Science, Ultimo, NSW, Australia, (26)University of Bern, Climate and Environmental Physics, Bern, Switzerland, (27)National Center for Atmospheric Research, CGD, Boulder, United States, (28)Environment and Climate Change Canada, Climate Research Division, Victoria, BC, Canada, (29)Max Planck Institute for Meteorology, Hamburg, Germany, (30)University of Leeds, College of Engineering, Mathematics, and Physical Sciences, Leeds, United Kingdom, (31)University of Colorado, Boulder, Cooperative Institute for Research in Environmental Sciences, Boulder, United States, (32)Spark Climate Solutions, San Francisco, United States, (33)University of Aberdeen, Institute of Biological and Environmental Sciences, Aberdeen, United Kingdom, (34)Boston College, Schiller Institute for Integrated Science and Society, Department of Earth and Environmental Sciences, Boston, United States
 
Spatiotemporal Variability of the Summertime Formaldehyde to Nitrogen Dioxide Ratios during the Utah Summer Ozone Study (USOS) and the Salt Lake City — Summer Ozone Study (SLC-SOS) (1954349)
Yaoxian Huang1, Like WANG2, Noribeth Mariscal2, Jiajue Chai3, Lin Lyu4, Max Horsford5, Wyndom Chace6, Kristen L Zuraski7, Eleanor Waxman7, Drew Rollins8, Steven S Brown8 and Caroline Womack9, (1)Wayne State University, Civil and Environmental Engineering, Detroit, MI, United States, (2)Wayne State University, Civil & Environmental Engineering, Detroit, MI, United States, (3)State University of New York College of Environmental Science and Forestry, Department of Chemistry, Syracuse, United States, (4)SUNY College of Environmental Science and Forestry, Department of Chemistry, Syracuse, NY, United States, (5)SUNY College of Environmental Science and Forestry, Graduate Program in Environmental Science, Syracuse, United States, (6)University of Colorado at Boulder, Department of Chemistry, Boulder, United States, (7)CU Boulder/CIRES, Boulder, United States, (8)NOAA Chemical Sciences Laboratory, Boulder, United States, (9)NOAA Earth System Research Laboratory, Chemical Sciences Laboratory, Boulder, United States
 
Tropospheric Ozone Trends (1998 to 2023) from SHADOZ, IAGOS and other Ground-based Networks: A Reference for Satellite Product and Model Assessments (1955156)
Debra E Kollonige1,2, Ryan M Stauffer2, Anne Thompson2,3, Gary A Morris4, Patrick Cullis5, Roeland Van Malderen6, Herman G J Smit7 and Bryan J Johnson4, (1)Science Systems and Applications, Inc., Lanham, United States, (2)NASA Goddard Space Flight Center, Greenbelt, United States, (3)University of Maryland Baltimore County/GESTAR-II, Baltimore, United States, (4)NOAA Global Monitoring Laboratory, Boulder, United States, (5)NOAA/ESRL Global Monitoring Laboratory, Boulder, United States, (6)Royal Meteorological Institute, Dourbes, Belgium, (7)Forschungszentrum Jülich GmbH, Institute of Climate and Energy Systems 3: Troposphere (ICE-3), Jülich, Germany
 
Investigating Atmospheric Mercury Cycling at Carlsbad Caverns National Park Using CMAQ-newHg-Br v2 (1959391)
Lin Wu, SUNY College of Environmental Science and Forestry, Syracuse, NY, United States, Huiting Mao, SUNY-ESF, Chemistry, Syracuse, United States, Winston T Luke, NOAA Air Resources Laboratory, Silver Spring, United States and Barkley C Sive, National Park Service Colorado, Air Resources Division, Denver, United States
 
BrO Observations in the Tropical and Subtropical UT/LS using Chemical Ionization Mass Spectrometry during the SABRE Campaign (1959634)
Daun Jeong1,2, Gordon Novak2, Drew Rollins2, Caroline Womack2, Nell Schafer1,3, Steven S Brown2, Behrooz Roozitalab4, Eric C Apel5, Troy D Thornberry2, Steve Cicicora2, Samantha Lee1,2 and Allison Moon6, (1)Cooperative Institute for Research in Environmental Sciences (CIRES), Boulder, United States, (2)NOAA Chemical Sciences Laboratory, Boulder, United States, (3)CU Boulder, Department of Chemistry, Boulder, United States, (4)NSF National Center for Atmospheric Research (NSF NCAR), Atmospheric Chemistry Observations & Modeling Laboratory (ACOM), Boulder, United States, (5)National Center for Atmospheric Research, Atmospheric Chemistry Observations and Modeling, Boulder, United States, (6)University of Washington, Department of Atmospheric and Climate Science, Seattle, United States
 
VOCs in Major US Cities during AEROMMA 2023 (Atmospheric Emissions and Reactions Observed from Megacities to Marine Areas) (1959805)
Carsten Warneke1, Rebecca Schwantes2, Jessica Gilman2, Chelsea E. Stockwell3, Matthew Mitchell Coggon4 and Victoria Treadaway5, (1)NOAA Boulder, Boulder, CO, United States, (2)NOAA Chemical Sciences Laboratory, Boulder, United States, (3)CU/CIRES; NOAA/CSL, Boulder, United States, (4)National Oceanic and Atmospheric Administration/U.S. Department of Commerce operative Institute for Research in Environmental Sciences/Chemical Sciences Division Boulder 80309 (United States), Chemical Sciences Division, Boulder, United States, (5)University of Miami, Miami, United States
 
Black Carbon Trends in the United States: Understanding the Discrepancies between Observations, Emissions, and Models (1960463)
Racine Nassau and Lyatt Jaegle, University of Washington, Department of Atmospheric and Climate Science, Seattle, United States
 
Evaluation of Gas-Phase Chemistry Advancements in NASA-GISS ModelE version 3.1 (1961802)
Haley Plaas, Columbia University of New York, Center for Climate Systems Research, New York, United States, Olivia Clifton, NASA Goddard Institute for Space Studies, New York, NY, 10025 USA, New York, United States, Gregory Faluvegi, Columbia University, Center for Climate Systems Research, New York, NY, United States, Kostas Tsigaridis, Columbia University, New York, United States and Susanne Bauer, NASA Goddard Institute for Space Studies, New York, United States
 
Two-Decade AIRS and MLS Observations Reveal QBO-Driven Variability of O3, H2O, and CO in the Tropical upper troposphere–lower stratosphere (1967455)
Jonathan H. Jiang1, Yiyang Zhang2, Hartmut Aumann3, Jiani Yang4, Xun Jian5, Yangcheng Luo4 and Yuk L Yung6, (1)NASA Jet Propulsion Laboratory, Pasadena, CA, United States, (2)Fudan University, Shanghai, China, (3)Retired, Pasadena, United States, (4)California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, United States, (5)Self, Pasadena, United States, (6)California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States
 
Low Molecular Weight Organic Acids in Cloud Water at Whiteface Mountain, New York: A Seven Year Study of Summertime Variability, Wildfire Impacts and Ammonium Interactions (2018-24) (1967879)
Archana Tripathy1, Christopher Lawrence2, Sara Lombardo1, Paul Casson3, Kathleen DeMarle4, Rudra Patel4, Lily P. Hammond4, Scott McKim5, Jim Schlemmer4, Haider Abbas Khwaja4, Elizabeth Yerger6, Mirza Hussain7, Daniel Kelting6, Phil Snyder8, Eric C Apel9, Rebecca S Hornbrook10, Alan J Hills11 and Sara Lance12, (1)University at Albany State University of New York, Albany, NY, United States, (2)NASA Goddard Institute for Space Studies and the Center for Climate Systems Research at Columbia University, NY, New York, United States, (3)University at Albany State University of New York, Atmospheric Sciences Research Center, Albany, United States, (4)University at Albany State University of New York, Albany, United States, (5)SUNY at Albany, Albany, United States, (6)Paul Smith's College Adirondack Watershed Institute, Paul Smiths, United States, (7)Wadsworth Center, Albany, United States, (8)Ausable River Association, Wilmington, United States, (9)National Center for Atmospheric Research, Atmospheric Chemistry Observations and Modeling, Boulder, United States, (10)National Center for Atmospheric Research, Atmospheric Chemistry Observations & Modeling Laboratory, Boulder, CO, United States, (11)National Center for Atmospheric Research, Atmospheric Chemistry Observations & Modeling Laboratory, Boulder, United States, (12)SUNY Albany, Albany, United States
 
NASA Earth Science Unit Notation Standard: Adoption of WIGOS Measurement Unit Code List (1969523)
Morgan L Silverman1,2, Elisabeth Huffer1,3, Megan Elizabeth Buzanowicz1,4, Brian Collister5, Michael Shook1, Anna Milan6, Jörg Klausen7 and Gao Chen1, (1)NASA Langley Research Center, Hampton, United States, (2)Analytical Mechanics Associates, Inc, Hampton, United States, (3)Lingua Logica, Denver, United States, (4)ADNET Systems, Inc., Bethesda, United States, (5)NASA Langley Research Center, Hampton, VA, United States, (6)World Meteorological Organization, Geneva, Switzerland, (7)MeteoSwiss, Federal Office of Meteorology and Climatology, Zurich, Switzerland
 
Assessing the Information Content of Fututre Infrared Sounders for Planetary Boundary Layer Characterization Using OSSEs and LES Data (1976028)
Robert C Wilson1, Derek J Posselt2, Joao Teixeira3, Marcin Kurowski3, Alyn Lambert4 and Vijay Natraj3, (1)NASA Jet Propulsion Laboratory, Pasadena, CA, United States, (2)University of California, Joint Institute for Regional Earth System Science and Engineering, Los Angeles, United States, (3)Jet Propulsion Laboratory, California Institute of Technology, Pasadena, United States, (4)NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, United States
 
Wildfire smoke influence on ozone and other atmospheric constituents during the Colorado Front Range OZone Éxperiment (FROZÉ 2025) (1976119)
Brandon McGuire1, Daniela Guevara1, Andrey Marsavin1, Amy Sullivan1, Jared Stickney1, Yong Zhou1, Jihee Ban1, Matthew Davis1, Wade Permar2, Emily Cope3, Damien Ketcherside3, Barkley C Sive4, Erick Mattson5, Alicia Frazier5, Daniel Welsh6, Tom Moore7, Lu Hu3, Jeffrey Lee Collett Jr1, Jeffrey R Pierce1 and Emily V Fischer1, (1)Colorado State University, Department of Atmospheric Science, Fort Collins, United States, (2)University of Montana, Department of Chemistry and Biochemistry, Missoula, MT, United States, (3)University of Montana, Department of Chemistry and Biochemistry, Missoula, United States, (4)National Park Service Colorado, Air Resources Division, Denver, United States, (5)Colorado Department of Public Health and Environment, Denver, United States, (6)Colorado Department of Public Health & Environment, Fort Collins, United States, (7)Regional Air Quality Council, Denver, United States
 
Investigating Organic Aerosol Composition, Phase State, and Health Effects Across Two Cities with Evolving Vehicle Fleets (Invited) (1980711)
Jenna Ditto1, Kinjal Kolhe2, Kamal Sahu2 and Harish C Phuleria3, (1)Washington University in St Louis, St. Louis, United States, (2)Indian Institute of Technology Bombay, Mumbai, India, (3)Indian Institute of Technology Bombay, Centre for Climate Studies, Environmental Science and Engineering Department, Mumbai, India
 
Quantification of the Reasons for Stagnation of the Expected Recovery of Northern Hemisphere, Mid-Latitude Ozone (1989695)
Ross J Salawitch1, Laura McBride2, Brian Francis Bennett3, Peter von Der Gathen4, Ingo Wohltmann4, Markus Rex4, Martyn Chipperfield5, Melanie Coldewey-Egbers6, Sandip Dhomse5, Vitali Fioletov7, Stacey M Frith8, Laila Howar1, Jos de Laat9, Diego G Loyola10, Emmanuel Mahieu11, Maxime Prignon12, Wolfgang Steinbrecht13, Ronald van der A9, Pam Wales14, Mark Weber15 and Jeannette Wild16, (1)University of Maryland College Park, College Park, MD, United States, (2)Science and Technology Corporation, Boulder, United States, (3)University of Maryland, Department of Atmospheric and Oceanic Science, College Park, MD, United States, (4)Alfred Wegener Institute, Helmholtz-Center for Polar and Marine Research Potsdam, Potsdam, Germany, (5)University of Leeds, School of Earth and Environment, Leeds, United Kingdom, (6)German Aerospace Center DLR Oberpfaffenhofen, Remote Sensing Technology Institute (IMF), Oberpfaffenhofen, Germany, (7)Environment and Climate Change Canada, Air Quality Research Division, Downsview, ON, Canada, (8)NASA Goddard SFC, Greenbelt, United States, (9)Royal Netherlands Meteorological Institute, De Bilt, Netherlands, (10)German Aerospace Center (DLR), Remote Sensing Technology Institute (IMF), Oberpfaffenhofen, Germany, (11)University of Liège, Institut d’Astrophysique et de Geophysique, UR SPHERES, Liège, Belgium, (12)Université de Liège, Liege, Belgium, (13)Deutscher Wetterdienst, Lindenberg, Germany, (14)University of Maryland College Park, College Park, United States, (15)University of Bremen, Institute of Environmental Physics, Bremen, Germany, (16)NOAA NWS NCEP, Climate Prediction Center, College Park, MD, United States
 
Data Homogenization and Improvements to the Beltsville, MD, USA, 20-year Ozonesonde Record (1990296)
Joshua Richards1, Ryan M Stauffer2, Anne Thompson2, Belay Demoz3, Ricardo Sakai4, Adrian Flores5 and Debra Kollonige6, (1)University of Maryland Baltimore County, Baltimore, United States, (2)NASA Goddard Space Flight Center, Greenbelt, United States, (3)University of Maryland Baltimore County, Physics, Baltimore, MD, United States, (4)Howard University, Washington, United States, (5)Howard University, Beltsville, United States, (6)Science Systems and Applications, Inc, Greenbelt, United States
 
City- and County-Level NOx Emission Trajectories in China from 2012 to 2024: Trends, Status and Emerging Challenges (1991333)
Hao Kong1, Jintai Lin2, Lulu Chen3, Ruijing Ni4, Sijie Wang2, Yuhang Zhang2 and Fangxuan Ren2, (1)Peking University, Department of Atmospheric and Oceanic Sciences, Beijing, China, (2)Peking University, Department of Atmospheric and Oceanic Sciences, School of Physics, Beijing, China, (3)George Washington University, Department of Environmental and Occupational Health, Washington, DC, United States, (4)Peking University, Beijing, China
 
Airborne Water Vapor Measurements with Open-path Dual-comb Spectroscopy (1991337)
Kevin Cossel1, Connor Fredrick2, Luke Horstman2, Timothy Rahmes3, Darrell Deane4, Brian Washburn5, Diana Ochoa-Mendoza3, Colton Parks2, Sameer Vartak6, Matt Wiebold7 and Chad Hoyt2, (1)National Institute of Standards and Technology Boulder Laboratories, Boulder, CO, United States, (2)Honeywell International, Advanced Sensing Technology Group, Plymouth, United States, (3)Boeing Company Seattle, Seattle, United States, (4)FLYHT Aerospace Solutions Ltd, Calgary, AB, Canada, (5)National Institute of Standards and Technology Boulder, Boulder, United States, (6)Honeywell International, Honeywell Technology Solutions Lab, Bengarluru, India, (7)Honeywell International, Honeywell Atmospheric Sensing, Plymouth, United States
 
Exploring the Potential Chemical Mechanism responsible for high PM2.5 during Haze Episodes over the Indo-Gangetic Plain : A Review (1997018)
Valasani Srilekha, Indian Institute of Technology Kharagpur, Department of Civil Engineering, Kharagpur, India and Shubha Verma, Indian Institute of Technology Kharagpur, Civil engineering, Kharagpur, India
 
Ozone Forecast Biases in UFS-AQM During Varying Smoke Intensities in EPA Region 3 (2001752)
Aara'L Yarber, NOAA Cooperative Science Center in Atmospheric Sciences and Meteorology, Howard University, Washington, United States and Sen Chiao, NOAA Cooperative Science Center in Atmospheric Sciences and Meteorology, Howard University, Washington, DC, United States
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