Christina Williamson¹, Agnieszka Kupc², Duncan Axisa³, Kelsey Bilsback⁴, Thaopaul V Bui⁵, Pedro Campuzano-Jost⁶, Maximilian Dollner⁷, Karl D Froyd⁸, Anna Lily Hodshire⁹, Jose L Jimenez¹⁰, Jack Kodros¹¹, Gan Luo¹², Daniel M Murphy¹³, Benjamin Nault¹⁴, Eric A Ray¹, Bernadett Weinzierl¹⁵, James Wilson¹⁶, Fangqun Yu¹², Pengfei Yu¹⁷, Jeffrey R Pierce¹¹ and Charles A Brock¹⁸, (1)NOAA/CIRES, Boulder, United States, (2)University of Vienna, Faculty of Physics, Vienna, Austria, (3)NCAR, Boulder, CO, United States, (4)Colorado State University, Department of Atmospheric Science, Fort Collins, CO, United States, (5)NASA Ames Research Center, Moffett Field, CA, United States, (6)University of Colorado at Boulder, Department of Chemistry and Biochemistry, Boulder, CO, United States, (7)Los Alamos, NM, United States, (8)NOAA/CIRES, Boulder, CO, United States, (9)Colorado State University, Fort Collins, CO, United States, (10)University of Colorado at Boulder, Department of Chemistry, Boulder, CO, United States, (11)Colorado State University, Atmospheric Science, Fort Collins, CO, United States, (12)SUNY Albany, Albany, NY, United States, (13)Earth System Research Laboratory, CSD, Boulder, CO, United States, (14)University of Colorado, Boulder, Boulder, CO, United States, (15)Centreville, MD, United States, (16)University of Denver, Denver, CO, United States, (17)CIRES, Boulder, CO, United States, (18)NOAA, Boulder, United States

Meinrat O Andreae, Scripps Institution of Oceanography, UCSD, La Jolla, United States; Max Planck Institute for Chemistry, Biogeochemistry Department, Mainz, Germany, Tracey W Andreae, Max Planck Institute for Chemistry, Mainz, Germany and Florian Ditas, Max Planck Institute for Chemistry, Multiphase Chemistry Department, Mainz, Germany

Veronique M Perraud¹, Jing Xu¹, Xiaoxiao Li^2,3, R. Benny Gerber⁴, James N Smith⁵ and Barbara J Finlayson-Pitts⁶, (1)University of California Irvine, Irvine, CA, United States, (2)University of California Irvine, Chemistry, Irvine, United States, (3)Tsinghua University, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Beijing, China, (4)Hebrew University of Jerusalem, Chemistry, Jerusalem, Israel, (5)UC Irvine, Chemistry, Irvine, CA, United States, (6)University of California Irvine, Chemistry, Irvine, CA, United States

Jonathan Abbatt, University of Toronto, Toronto, ON, Canada

Federico Bianchi¹, Diego Aliaga², Qiaozhi Zha², Liine Heikkinen², Marcos Andrade³, Markku Tapio Kulmala² and Claudia Mohr⁴, (1)University of Helsinki, Helsinki, Finland, (2)University of Helsinki, Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, Helsinki, Finland, (3)Universidad Mayor de San Andrés, Laboratorio de Fisica de la Atmosfera, La Paz, Bolivia, (4)Stockholm University, Department of Environmental Science and Analytical Chemistry, Stockholm, Sweden

Sophia Brilke^1,2, Nikolaus Fölker¹, Konrad Kandler³, Nan Ma⁴, Thomas Müller⁵, Jeff Peischl⁶, Anne Philipp¹, Petra Seibert⁷, Bernadett Weinzierl¹ and Paul Winkler¹, (1)University of Vienna, Faculty of Physics, Vienna, Austria, (2)Vienna Doctoral School in Physics, Faculty of Physics, Vienna, Austria, (3)Technische Universität Darmstadt, Institut für Angewandte Geowissenschaften, Darmstadt, Germany, (4)Jinan University, Institute for Environmental and Climate Research, Guangzhou, China, (5)Leibniz Institute for Tropospheric Research, Leipzig, Germany, (6)NOAA Chemical Sciences Division, Boulder, CO, United States, (7)BOKU University of Natural Resources and Life Sciences, Institute of Meteorology, Vienna, Austria

Shanhu Lee¹, Lee Tiszenkel², Christopher M Stangl³, Justin Krasnomowitz³, Qi Ouyang⁴ and Murray V Johnston³, (1)University of Alabama in Huntsville, Huntsville, AL, United States, (2)University of Alabama in Huntsville, Atmospheric Science, Huntsville, AL, United States, (3)University of Delaware, Chemistry, Newark, DE, United States, (4)University of Alabama in Huntsville, Huntsville, United States

Henning Finkenzeller^1,2, Siddharth Iyer³, Theodore Konstantinos Koenig^1,2, Xucheng He³, Dexian Chen⁴, Andreas Kurten⁵, Joschka Pfeiffer⁵, Neil McPherson Donahue⁴, Joachim Curtius⁵, Jasper Kirkby^5,6, Markku Tapio Kulmala^3,7, Mikko Sipilä³, Theo Kurten³, Rainer M Volkamer^1,2 and CLOUD collaboration, (1)University of Colorado at Boulder, Boulder, CO, United States, (2)Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States, (3)University of Helsinki, Helsinki, Finland, (4)Carnegie Mellon University, Pittsburgh, PA, United States, (5)Goethe University Frankfurt, Frankfurt, Germany, (6)CERN European Organization for Nuclear Research, Physics, Geneva, Switzerland, (7)Beijing University of Chemical Technology, Aerosol and Haze Laboratory, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing, China

Jialei Zhu, University of Michigan Ann Arbor, Ann Arbor, MI, United States and Joyce Penner, Univ Michigan, Ann Arbor, MI, United States

Urs Baltensperger¹, Mao Xiao², Christopher Hoyle², Lubna Dada³, Mingyi Wang⁴, Dominik Stolzenburg⁵, Bernhard Mentler⁶, Andrea Baccarini⁷, Ping Lee Chuan¹, Houssni Lamkaddam¹, Ruby Marten¹, Imad El-Haddad⁷, Josef Dommen⁷ and CLOUD Collaboration, (1)Paul Scherrer Institute, Villingen, Switzerland, (2)Paul Scherrer Institute, 5232 Villigen, Switzerland, (3)University of Helsinki, Helsinki, 00014, Finland, (4)Carnegie Mellon University, Pittsburgh, United States, (5)University of Vienna, Vienna, 1090, Austria, (6)University of Innsbruck, Institute of Ion Physics and Applied Physics, Innsbruck, Austria, (7)Paul Scherrer Institute, Villigen, Switzerland

Chongai Kuang, Brookhaven National Laboratory, Environmental and Climate Sciences Department, Upton, NY, United States, Matthew Boyer, Brookhaven National Laboratory, Environmental and Climate Sciences Department, Upton, United States, Fan Mei, Pacific Northwest National Laboratory, Richland, WA, United States and Darielle Dexheimer, Sandia National Laboratories, Org 8863, Albuquerque, NM, United States

Ananth Ranjithkumar¹, Hamish Gordon¹, Christina Williamson², Kirsty Pringle¹, Agnieszka Kupc³, Charles A Brock⁴ and Ken S Carslaw⁵, (1)University of Leeds, Leeds, United Kingdom, (2)NOAA/CIRES, Boulder, United States, (3)University of Vienna, Faculty of Physics, Vienna, Austria, (4)NOAA, Boulder, United States, (5)University of Leeds, Leeds, LS2, United Kingdom

David Roy Hanson, Augsburg College, Chemistry, Minneapolis, MN, United States

James N Smith¹, Sabrina Chee², Nanna Myllys², Xiaoxiao Li², Jingkun Jiang³ and Jeffrey R Pierce⁴, (1)University of California Irvine, Department of Chemistry, Irvine, CA, United States, (2)University of California Irvine, Chemistry, Irvine, United States, (3)Tsinghua Univeristy, Beijing, China, (4)Colorado State University, Atmospheric Science, Fort Collins, CO, United States

Shantanu Jathar¹, Naman Sharma², Jeffrey R Pierce³, Timothy Dean Gordon⁴, Joonas Vanhanen⁵ and John Volckens¹, (1)Colorado State University, Mechanical Engineering, Fort Collins, CO, United States, (2)Colorado State University, Fort Collins, United States, (3)Colorado State University, Atmospheric Science, Fort Collins, CO, United States, (4)NOAA Boulder, Boulder, CO, United States, (5)Airmodus Ltd., Helsinki, Finland