Michael J Lawler¹, Eric S Saltzman¹, Andrea Baccarini², Julia Schmale³, Linn Karlsson⁴, Paul Zieger⁵ and Caroline Leck⁶, (1)University of California Irvine, Irvine, CA, United States, (2)Paul Scherrer Institute, Villigen, Switzerland, (3)Paul Scherrer Institute, Laboratory of Atmospheric Chemistry, Villingen, Switzerland, (4)Stockholm University, Stockholm, Sweden, (5)Stockholm University, ACES, Stockholm, Sweden, (6)Stockholm University, Department of Meteorology, Stockholm, Sweden

Keiichiro Hara¹, Kazuo Osada², Masanori Yabuki³, Sumito Matoba⁴, Fumio Nakazawa⁵, Shuji Fujita⁶, Motohiro Hirabayashi⁷ and Takashi Yamanouchi⁶, (1)Fukuoka University, Fukuoka, Japan, (2)Nagoya Univ, Nagoya, Japan, (3)Kyoto University/RISH, Uji, Japan, (4)Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan, (5)NIPR National Institute of Polar Research, Tokyo, Japan, (6)Natl Inst Polar Research, Tokyo, Japan, (7)Nat''l Inst. of Polar Research, Tokyo, Japan

Paul Zieger¹, Linn Karlsson¹, Makoto Koike², Kerstin Ebell³ and R. Krejci¹, (1)Stockholm University, Stockholm, Sweden, (2)Univ Tokyo, Tokyo, Japan, (3)University of Cologne, Cologne, Germany

Lynn M Russell¹, Patricia Quinn², Amanda A Frossard³, Warren Richard Leaitch⁴, Sangeeta Sharma⁴ and Dan Lubin¹, (1)University of California San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States, (2)NOAA/PMEL, Seattle, WA, United States, (3)University of Georgia, Department of Chemsitry, Athens, GA, United States, (4)Environment Canada, Toronto, ON, Canada

Kaihui Xia¹, Sheng-Shi Mei¹, Cheng-Cheng Liu¹, Zhixuan Bai², Jianchun Bian^2,3 and Shang Liu¹, (1)University of Science and Technology of China, School of Earth and Space Sciences, Hefei, China, (2)Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China, (3)University of Chinese Academy of Sciences, College of Earth Sciences, Beijing, China

John Prytherch¹, Brett Thornton², Ian M Brooks³, Patrick M Crill⁴ and Michael K H Tjernstrom¹, (1)Stockholm University, Dept. of Meteorology, Stockholm, Sweden, (2)Stockholm University, Department of Geological Sciences, Stockholm, Sweden, Stockholm, Sweden, (3)University of Leeds, Leeds, United Kingdom, (4)Stockholm University, Stockholm, Sweden

Chloe Y. Gao¹, Colette L Heald¹, Pedro Campuzano Jost², Jose L Jimenez³ and Joseph M Katich⁴, (1)Massachusetts Institute of Technology, Civil and Environmental Engineering, Cambridge, MA, United States, (2)University of Colorado Boulder, Boulder, CO, United States, (3)University of Colorado at Boulder, Department of Chemistry, Boulder, CO, United States, (4)CIRES, Boulder, CO, United States

Jutta Vüllers¹, Ian M Brooks², Michael K H Tjernstrom³, John Prytherch³, Peggy Achtert⁴, Ryan Neely¹, Matthias Gottschalk⁵, Ulrike Egerer⁶, Manfred Wendisch⁵ and Holger Siebert⁶, (1)University of Leeds, Leeds, United Kingdom, (2)University of Leeds, School of Earth and Environment, Leeds, United Kingdom, (3)Stockholm University, Dept. of Meteorology, Stockholm, Sweden, (4)University of Reading, Dept. of Meteorology, Reading, United Kingdom, (5)University of Leipzig, Leipzig Institute for Meteorology, Leipzig, Germany, (6)Leibniz Institute for Tropospheric Research, Leipzig, Germany

Kumiko Goto Azuma^1,2, Yoshimi Ogawa-Tsukagawa¹, Yutaka Kondo¹, Remi Dallmayr^1,3, Motohiro Hirabayashi¹, Jun Ogata¹, Kyotaro Kitamura¹, Kenji Kawamura^1,2, Hideaki Motoyama^1,2, Sumito Matoba⁴, Teruo Aoki^1,2, Nobuhiro Moteki⁵, Sho Ohata^5,6, Tatsuhiro Mori⁷, Makoto Koike⁵, Yuki Komuro¹, Akane Tsushima⁸, Naoko Nagatsuka¹, Wataru Shigeyama^1,2 and Koji Fujita⁹, (1)National Institute of Polar Research, Tokyo, Japan, (2)SOKENDAI Graduate University for Advanced Studies, Kanagawa, Japan, (3)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany, (4)Hokkaido University, Sapporo, Japan, (5)University of Tokyo, Tokyo, Japan, (6)Nagoya University, Nagoya, Japan, (7)Tokyo University of Science, Tokyo, Japan, (8)Meterological Research Institute, Tsukuba, Japan, (9)Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan

Thorsten Bartels-Rausch¹, Jacinta Edebeli¹, Jürg C. Trachsel², Anja Eichler¹, Martin Schneebeli² and Markus Ammann¹, (1)Paul Scherrer Institut, Laboratory of Environmental Chemistry, Villigen PSI, Switzerland, (2)WSL Institute for Snow and Avalanche Research SLF, Davos, Switzerland

Peter Peterson¹, Siyuan Wang², Sham Thanekar³, Jose D Fuentes⁴, Paul B Shepson⁵, Johannes Zielcke⁶, Udo Friess⁷, Denis Pöhler⁸, Ulrich Platt⁷, William R Simpson⁹, Son V Nghiem¹⁰ and Kerri Pratt¹¹, (1)Whittier College, Whittier, CA, United States, (2)National Center for Atmospheric Research, Boulder, CO, United States, (3)Pennsylvania State University Main Campus, University Park, PA, United States, (4)Penn State University, University Park, PA, United States, (5)Purdue University, Departments of Chemistry, and Earth, Atmospheric, and Planetary Sciences, West Lafayette, IN, United States, (6)Institute for Environmental Physics, Heidelberg, Germany, (7)University of Heidelberg, Heidelberg, Germany, (8)University of Heidelberg, Institute for Environmental Physics, Heidelberg, Germany, (9)Univ. Alaska, Fairbanks, AK, United States, (10)Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States, (11)University of Michigan Ann Arbor, Department of Chemistry and Department of Earth & Environmental Sciences, Ann Arbor, MI, United States

Ilias Bougoudis, Anne Blechschmidt, Andreas Richter, Sora Seo and John Philip Burrows, University of Bremen, Institute of Environmental Physics, Bremen, Germany

Ruth Price¹, Ken S Carslaw², Ian M Brooks¹ and Paul Field^1,3, (1)University of Leeds, Leeds, United Kingdom, (2)University of Leeds, Leeds, LS2, United Kingdom, (3)United Kingdom Met Office, Exeter, United Kingdom

Zhuang Jiang¹, John Wesley Robinson², Becky Alexander³, Joseph Henri Erbland⁴, Joel P Savarino⁵ and Lei Geng¹, (1)University of Science and Technology of China, Hefei, China, (2)University of Washington Seattle Campus, Department of Atmospheric Sciences, Seattle, WA, United States, (3)University of Washington, Department of Atmospheric Sciences, Seattle, WA, United States, (4)Univ. Grenoble Alpes, CNRS, IRD, G-INP, Institut des Géosciences de l’Environnement, Grenoble, France, (5)University Grenoble Alpes, CNRS, IRD, Institute for Geosciences and Environmental research, Grenoble, France

Zhiwen Dong, CAREERI,CAS, Lanzhou, Gansu, China

Ting Wei, Lanzhou, Gansu, China, Zhiwen Dong, Chinese Academy of Sciences, Beijing, China and Kang Shichang, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China

Stelios Kazadzis, World Radiation center, Physikalisch-Metorologisches Observatorium Davos (PMOD), Davos, Switzerland and Natalia Kouremeti Dr, PMOD Wold Radiation Center, Davos Dorf, Switzerland

Jun Liu¹, Matthew Gunsch¹, Claire Elizabeth Moffett², Rebecca J Sheesley³, Ningxin Wang⁴, Qi Zhang⁵, Thomas B Watson⁶ and Kerri Pratt⁷, (1)University of Michigan Ann Arbor, Ann Arbor, MI, United States, (2)Baylor University, Department of Environmental Science, Waco, TX, United States, (3)Baylor University, Environmental Science, Waco, TX, United States, (4)UC Davis, Department of Environmental Toxicology, Davis, CA, United States, (5)University of California Davis, Department of Environmental Toxicology, Davis, CA, United States, (6)Brookhaven National Laboratory, Upton, NY, United States, (7)University of Michigan Ann Arbor, Department of Chemistry and Department of Earth & Environmental Sciences, Ann Arbor, MI, United States

Nicola J Blake¹, Donald Ray Blake¹, Simone Meinardi¹, Barbara Barletta¹, Isobel J Simpson¹, Stacey Hughes¹, Nicholas Vizenor¹, Christopher Woods¹, Brenna Biggs¹, Alex Jarnot¹, Louisa K Emmons², Eric C Apel², Rebecca S Hornbrook², Stephen A Montzka³, Eric A Ray⁴, J Elliott Campbell⁵, Jack E Dibb⁶, Roisin Commane⁷ and Stephen Wofsy⁸, (1)University of California Irvine, Irvine, CA, United States, (2)National Center for Atmospheric Research, Boulder, CO, United States, (3)NOAA/ESRL Global Monitoring Division, Boulder, CO, United States, (4)NOAA/CIRES, Boulder, United States, (5)University of California Merced, Merced, CA, United States, (6)Univ New Hampshire, Durham, NH, United States, (7)Columbia University, Lamont-Doherty Earth Observatory, Palisades, NY, United States, (8)Harvard University, Cambridge, MA, United States

Takashi Shibata, Nagoya University, Nagoya, Japan, Koichi Shiraishi, Fukuoka University, Fukuoka, Japan, Masataka Shiobara, National Inst Polar Research, Tokyo, Japan, Suginori Iwasaki, National Defense Academy, Kanagawa, Japan and Toshiaki Takano, Chiba University, Department of Electrical and Electronics Engineering, Chiba, Japan

Jennie L Thomas, IGE - Institut des Géosciences de l'Environnement, Grenoble Cedex 9, France, Louis Marelle, UPMC (Univ. Paris) / LATMOS, Paris, France, William R Simpson, Univ. Alaska, Fairbanks, AK, United States, William Swanson, University of Alaska Fairbanks, Fairbanks, AK, United States, Kathleen Tuite, University of California Los Angeles, Los Angeles, CA, United States, Jochen Stutz, UCLA, Los Angeles, CA, United States, Markus M Frey, British Antarctic Survey, Cambridge, United Kingdom and Didier Voisin, UGA,CNRS, Institut des Geosciences de l’Environnement (IGE) UMR 5001, Grenoble, France

Thomas Thorp¹, Steve Arnold¹, Dominick V Spracklen¹, Richard Pope¹, Luke Conibear¹, Christoph Knote², Boris D Belan³, Mikhail Arshinov⁴ and Andrei I Skorokhod⁵, (1)University of Leeds, Leeds, United Kingdom, (2)Ludwig-Maximilians-University (LMU), Meteorological Institute, Munich, Germany, (3)V.E. Zuev Institute of Atmospheric Optics SB RAS, Tomsk, Russia, (4)Russian Academy of Sciences, V. E. Zuev Institute of Atmospheric Optics, Tomsk, Russia, (5)A.M.Obukhov Institute of Atmospheric Physics RAS, Moscow, Russia

Markus M Frey¹, Ian M Brooks², Sarah J Norris², Kouichi Nishimura³, William R Simpson⁴ and Anna E. Jones¹, (1)NERC British Antarctic Survey, Cambridge, United Kingdom, (2)University of Leeds, Leeds, United Kingdom, (3)Nagoya University, Nagoya, Japan, (4)Univ. Alaska, Fairbanks, AK, United States

Roghayeh Ghahremaninezhadgharelar¹, Wanmin Gong¹, Ann Lise Norman², Stephen Reuben Beagley¹, Ayodeji Akingunola¹ and Paul Makar¹, (1)Environment and Climate Change Canada, Air Quality Research Division, Toronto, ON, Canada, (2)University of Calgary, Calgary, AB, Canada

Foteini Baladima, UGA,CNRS,IGE Institut des Géosciences de l’Environnement, Grenoble, France, Jennie L Thomas, IGE Institut des Géosciences de l’Environnement, Grenoble, France, Marie Dumont, Météo-France -CNRS CNRM/CEN, Saint Martin d'Hères, France, Didier Voisin, UGA,CNRS, Institut des Geosciences de l’Environnement (IGE) UMR 5001, Grenoble, France, Clementine Junquas, IGE - IRD, Grenoble, France, Christophe Lavaysse, Université Grenoble Alpes, IGE - IRD, Grenoble, France, Romain Biron, Université Grenoble Alpes, IGE, Grenoble, France and François Tuzet, Verneuil En Halatte, France; Météo-France -CNRS CNRM/CEN, Grenoble, France

Claire Elizabeth Moffett¹, Tate Edward Barrett², Subin Yoon³ and Rebecca J Sheesley³, (1)Baylor University, Department of Environmental Science, Waco, TX, United States, (2)Baylor University, Department of Geography and the Environment, Denton, TX, United States, (3)Baylor University, Environmental Science, Waco, TX, United States

Nathan Chellman¹, Joseph R McConnell², Andrew I Wilson³, Andreas Stohl⁴, Monica M Arienzo⁵, Sabine Eckhardt⁶, Diedrich Fritzsche⁷, Sepp Kipfstuhl⁸, Thomas Opel⁹, Elisabeth Thompson³, Mark Pollard³, Philip Place Jr¹⁰ and Jorgen Peder Steffensen¹¹, (1)Desert Research Institute Reno, Reno, NV, United States, (2)Desert Res Inst, Reno, NV, United States, (3)University of Oxford, Oxford, United Kingdom, (4)Norwegian Institute for Air Research, Kjeller, Norway, (5)Desert Research Institute, Reno, NV, United States, (6)Norwegian Institute for Air Research, Atmospheric and Climate Research (ATMOS), Kjeller, Norway, (7)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Potsdam, Potsdam, Germany, (8)Alfred Wegener Institute, Bremerhaven, Germany, (9)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Potsdam, Department of Periglacial Research, Potsdam, Germany, (10)University of Rochester, Department of Earth and Environmental Sciences, Rochester, NY, United States, (11)Centre for Ice and Climate, Copenhagen, Denmark

William Swanson¹, Kaitlyn Confer², Christopher D Holmes³, Jiayue Huang⁴, Lyatt Jaegle⁴ and William R Simpson⁵, (1)University of Alaska Fairbanks, Fairbanks, AK, United States, (2)University of Washington, Department of Atmospheric Sciences, Seattle, United States, (3)Florida State University, Tallahassee, FL, United States, (4)University of Washington, Seattle, WA, United States, (5)Univ. Alaska, Fairbanks, AK, United States

Jianzhong Xu¹, Anusha Priyadarshani Silva Hettiyadura², Yanmei Liu³, Xinghua Zhang⁴, Kang Shichang⁴ and Alexander Laskin⁵, (1)Chinese Academy of Sciences, Beijing, China, (2)Purdue University, Department of Chemistry, West Lafayette, United States, (3)Northwest Institute of Eco-Environment Resource, Lanzhou, China, (4)Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China, (5)Purdue University, Department of Chemistry, West Lafayette, IN, United States

Saewung Kim¹, Roger Seco¹, Daun Jeong², Keyhong Park³, Kitae Kim⁴, Sanjeevi Nagalingam¹, Gracie Wong⁵ and Alex B Guenther⁶, (1)University of California Irvine, Department of Earth System Science, Irvine, CA, United States, (2)University of California Irvine, Irvine, CA, United States, (3)KOPRI Korea Polar Research Institute, Incheon, Korea, Republic of (South), (4)Korea Polar Research Institute, Incheon, South Korea, (5)University of California, Irvine, Department of Earth System Science, Irvine, CA, United States, (6)Pacific Northwest National Laboratory, Richland, WA, United States

Molly Peek, Western Washington University, Bellingham, United States, Andrew J Hodson, University Centre in Svalbard, Longyearbyen, Norway and Alia Lauren Khan, Institute of Arctic and Alpine Research, Boulder, CO, United States

Barbara Noziere¹, Violaine Gérard², Ludovic Fine³, Corinne Ferronato², Dharmendra Kumar Singh⁴, Amanda A. Frossard⁵, Ronald C Cohen⁶, Eija Asmi⁷, Heikki Lihavainen⁷, Niku Kivekäs⁷, Minna Aurela⁷, David Brus⁷, Sanja Frka and Ana Cvitešić⁹, (1)CNRS Lyon, Lyon, France, (2)CNRS Lyon, IRCELYON, Villeurbanne, France, (3)CNRS, Paris Cedex 16, France, (4)CNRS Lyon, Ircelyon, Villeurbanne, France, (5)University of Georgia, Chemistry, Athens, GA, United States, (6)UC Berkeley, Berkeley, CA, United States, (7)Finnish Meteorological Institute, Helsinki, Finland, (8)Ruđer Bošković Institute, Division for Marine and Environmental Research, Zagreb, Croatia

Songyun Fan¹, Chris Marsay², Barry Lai³, William M Landing⁴, Ellery D Ingall⁵, Cliff Buck⁶, Peter L Morton⁷ and Yuan Gao¹, (1)Rutgers University, Department of Earth and Environmental Sciences, Newark, NJ, United States, (2)Skidaway Institute of Oceanography, Savannah, United States, (3)Argonne National Laboratory, Argonne, IL, United States, (4)Florida State University, Earth, Ocean, and Atmospheric Science, Tallahassee, FL, United States, (5)Georgia Tech, Atlanta, GA, United States, (6)University of Georgia, Athens, GA, United States, (7)Florida State University, Earth, Ocean and Atmospheric Science, Tallahassee, FL, United States

Lyatt Jaegle¹, Jiayue Huang¹, Qianjie Chen², Becky Alexander³, Johan Schmidt⁴, Tomás Sherwen⁵, Nicolas Theys⁶ and Sungyeon Choi⁷, (1)University of Washington, Seattle, WA, United States, (2)University of Washington Seattle Campus, Department of Atmospheric Sciences, Seattle, WA, United States, (3)University of Washington, Department of Atmospheric Sciences, Seattle, WA, United States, (4)University of Copenhagen, Department of Chemistry, København K, Denmark, (5)Wolfson Atmospheric Chemistry Laboratories,, Department of Chemistry, University of York, York, United Kingdom, (6)Royal Belgian Institute for Space Aeronomy, Brussels, Belgium, (7)SSAI, Elkridge, MD, United States

Manu Anna Thomas¹, Abhay Devasthale¹, Michael K H Tjernstrom² and Annica Ekman³, (1)Swedish Meteorological and Hydrological Institute, Norrköping, Sweden, (2)Stockholm University, Dept. of Meteorology, Stockholm, Sweden, (3)Stockholm University, Department of Meteorology, Stockholm, Sweden

Hannah Marie Horowitz¹, Simone Tilmes², Susannah M Burrows³, Cecilia M Bitz⁴, Jiayue Huang¹, Lyatt Jaegle¹, Po-Lun Ma³ and Becky Alexander⁵, (1)University of Washington, Seattle, WA, United States, (2)National Center for Atmospheric Research, Atmospheric Chemistry, Observations, and Modeling Laboratory, Boulder, CO, United States, (3)Pacific Northwest National Laboratory, Richland, WA, United States, (4)University of Washington, Dept. of Atmospheric Sciences, Seattle, WA, United States, (5)University of Washington, Department of Atmospheric Sciences, Seattle, WA, United States

Eric C Apel¹, Rebecca S Hornbrook¹, Alan J Hills¹, Siyuan Wang¹, Louisa K Emmons¹, Rebecca Schwantes² and ATom Science Team, (1)National Center for Atmospheric Research, Boulder, CO, United States, (2)National Center for Atmospheric Research, Atmospheric Chemistry Observations & Modeling Laboratory, Boulder, CO, United States

Kerri Pratt, University of Michigan Ann Arbor, Department of Chemistry and Department of Earth & Environmental Sciences, Ann Arbor, MI, United States, Jun Liu, University of Michigan Ann Arbor, Ann Arbor, MI, United States and Jamy Lee, University of Michigan, Ann Arbor, MI, United States

Ted Hullar, University of California Davis, Davis, CA, United States, Oliver Palmer, University of California, Davis, Davis, United States and Cort Anastasio, University of California Davis, Department of Land, Air and Water Resources, Davis, CA, United States

Qianjie Chen¹, Rachel Kirpes², Sham Thanekar³, Angela R. W. Raso⁴, Stephen M McNamara⁵, Lucia Upchurch⁶, Patricia Quinn⁷, Jose D Fuentes⁸, Jesus Ruiz-Plancarte³, Paul Shepson⁹ and Kerri Pratt¹⁰, (1)University of Michigan Ann Arbor, Ann Arbor, MI, United States, (2)University of Michigan, Ann Arbor, MI, United States, (3)Pennsylvania State University Main Campus, University Park, PA, United States, (4)Purdue University, West Lafayette, IN, United States, (5)University of Michigan Ann Arbor, Department of Chemistry, Ann Arbor, MI, United States, (6)Joint Institute for the Study of the Atmosphere and Ocean, Seattle, WA, United States, (7)NOAA/PMEL, Seattle, WA, United States, (8)Penn State University, University Park, PA, United States, (9)Stony Brook University, Stony Brook, NY, United States, (10)University of Michigan Ann Arbor, Department of Chemistry and Department of Earth & Environmental Sciences, Ann Arbor, MI, United States