Georgiy L Stenchikov, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia, Mark R Schoeberl, Science and Technology Corporation, Earth Sciences, Boulder, CO, United States, Ewa Bednarz, CIRES / NOAA Chemical Sciences Laboratory, Boulder, United States, Ilaria Quaglia, National Center for Atmospheric Research, Atmospheric Chemistry Observations and Modeling Laboratory, Boulder, United States, Zhihong Zhuo, University of Quebec in Montreal (UQAM), Department of Earth and Atmospheric Sciences, Montreal, QC, Canada, Eric L Fleming, NASA Goddard Space Flight Center, Greenbelt, MD, United States, Yi Huang, McGill University, Atmospheric and Oceanic Sciences, Montreal, QC, Canada, Pasquale Sellitto, Université Paris Est Créteil, Université de Paris-Cité, CNRS, Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA-IPSL), Créteil Cedex, France, Claudia Timmreck, Max Planck Institute for Meteorology, Hamburg, Germany, Matthew Toohey, University of Saskatchewan, Saskatoon, Canada and Jun Wang, University of Iowa, Chemical and Biochemical Engineering, Iowa City, IA, United States

Ilaria Quaglia¹, Daniele Visioni², Ewa Bednarz^3,4, Yunqian Zhu^5,6, Georgiy L Stenchikov⁷, Cheng-Cheng Liu⁸, Graham W Mann⁹, Yifeng Peng¹⁰, Takashi Sekiya¹¹, Simone Tilmes¹², Xinyue Wang¹³, Shingo Watanabe¹⁴, Pengfei Yu¹⁵, Jun Zhang¹ and Wandi Yu¹⁶, (1)National Center for Atmospheric Research, Atmospheric Chemistry Observations and Modeling Laboratory, Boulder, United States, (2)Cornell University, Ithaca, NY, United States, (3)NOAA, Chemical Sciences Laboratory, Boulder, United States, (4)Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, United States, (5)Cooperative Institute for Research in Environmental Sciences, Boulder, United States, (6)NOAA Chemical Sciences Laboratory, Boulder, United States, (7)King Abdullah University of Science and Technology, Thuwal, Saudi Arabia, (8)University of Colorado at Boulder, Laboratory for Atmospheric and Space Physics, Boulder, United States, (9)University of Leeds, Leeds, LS2, United Kingdom, (10)Lanzhou University, Lanzhou, China, (11)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Research Institute for Global Change, Kanagawa, Japan, (12)NSF National Center for Atmospheric Research, Atmospheric Chemistry Observations and Modeling Laboratory, Boulder, United States, (13)Purdue University, EAPS, West Lafayette, United States, (14)Tohoku University, Advanced Institute for Marine-Ecosystem Change, Sendai, Japan, (15)Jinan University, Institute for Environmental and Climate Research, Guangzhou, China, (16)Lawrence Livermore National Laboratory, Livermore, United States

Valentina Aquila, American University, Department of Environmental Science, Washington, DC, United States, Rei Ueyama, NASA Ames Research Center, Moffett Field, CA, United States, Adam E Bourassa, University of Saskatchewan, Department of Physics & Engineering Physics, Saskatoon, SK, Canada, Sergey Khaykin, Laboratoire Atmosphères, Observations Spatiales (LATMOS), CNRS/INSU, Sorbonne Université, Guyancourt, France, Alexandre Baron, CIRES, U. of Colorado, Boulder / NOAA Chemical Sciences Laboratory, Boulder, United States, Landon A Rieger, University of Saskatchewan, Saskatoon, SK, Canada and Alexei Rozanov, University of Bremen, Institute of Environmental Physics, Bremen, Germany

William John Randel, National Center for Atmospheric Research, Boulder, CO, United States, Jon Starr, National Center for Atmospheric Research, Boulder, United States and Xinyue Wang, University of Colorado at Boulder, ATOC, Boulder, United States

Aaron Mark Johnson, Mark Flanner and Christiane Jablonowski, University of Michigan, Department of Climate and Space Sciences and Engineering, Ann Arbor, United States

Zhihong Zhuo, University of Quebec in Montreal (UQAM), Department of Earth and Atmospheric Sciences, Montreal, QC, Canada, Xinyue Wang, University of Colorado at Boulder, ATOC, Boulder, United States, Yunqian Zhu, NOAA Chemical Sciences Laboratory, Boulder, United States, Francesco S.R. Pausata, University of Quebec in Montreal (UQAM), Department of Earth and Atmospheric Sciences, Montreal, Canada and Hunga assessment team

Xinyue Wang, University of Colorado at Boulder, ATOC, Boulder, United States and Lawrence Coy, NASA GSFC and SSAI, Greenbelt, United States

Corwin Wright, University of Bath, Bath, BA2, United Kingdom, Jia Yue, GSFC, NASA, Greenbelt, United States, Neil Hindley, University of Bath, Centre for Climate Adaptation and Environment Research, Bath, BA2, United Kingdom, Jiuhou Lei, Univ. of Sci. & Tech. of Chin, Hefei, Anhui, China, Luis Millan, NASA Jet Propulsion Laboratory, Pasadena, CA, United States, Sandra Wallis, University of Greifswald, Greifswald, Germany and Wandi Yu, Lawrence Livermore National Laboratory, Livermore, United States

Xin Zhou^1,2, Quanliang Chen³, Wuhu Feng², Saffron Heddell², Sandip Dhomse², Graham W Mann⁴, Hugh C Pumphrey⁵, Luis Millan⁶, Michelle L Santee⁷ and Martyn Chipperfield², (1)Chengdu University of Information Technology, School of Atmospheric Science, Chengdu, China, (2)University of Leeds, School of Earth and Environment, Leeds, United Kingdom, (3)Chengdu University of Information Technology, Chengdu, China, (4)University of Leeds, Leeds, LS2, United Kingdom, (5)University of Edinburgh, Edinburgh, United Kingdom, (6)NASA Jet Propulsion Laboratory, Pasadena, CA, United States, (7)JPL, Pasadena, United States

Saffron Heddell¹, Martyn Chipperfield², Graham W Mann³, Sandip Dhomse², Wuhu Feng², Masaru Yoshioka¹ and Xin Zhou⁴, (1)University of Leeds, Leeds, United Kingdom, (2)University of Leeds, School of Earth and Environment, Leeds, United Kingdom, (3)University of Leeds, Leeds, LS2, United Kingdom, (4)Chengdu University of Information Technology, School of Atmospheric Sciences, Chengdu, China

Armin Kleinboehl¹, Geoffrey C Toon¹, J F Blavier², Laila Howar³ and Ross J Salawitch⁴, (1)NASA Jet Propulsion Laboratory, Pasadena, CA, United States, (2)Jet Propulsion Laboratory, Pasadena, CA, United States, (3)University of Maryland College Park, College Park, MD, United States, (4)University of Maryland, AOSC and Chemistry, College Park, United States

Freja F Oesterstroem, Aarhus University, Department of Environmental Science, Roskilde, Denmark; Harvard University, Cambridge, MA, United States, Michelle L Santee, JPL, Pasadena, United States, Martyn Chipperfield, University of Leeds, School of Earth and Environment, Leeds, United Kingdom, Stephanie Evan, CIRES, Boulder, United States, Dan Smale, National Institute of Water & Atmospheric Research (NIWA), Lauder, New Zealand, Krzysztof Wargan, NASA Goddard Space Flight Center, Greenbelt, United States, David M Wilmouth, Harvard University, Cambridge, United States and Ingo Wohltmann, Alfred Wegener Institute, Helmholtz-Center for Polar and Marine Research Potsdam, Potsdam, Germany

Wandi Yu, Lawrence Livermore National Laboratory, Livermore, CA, United States, Xinyue Wang, Purdue University, EAPS, West Lafayette, United States, William John Randel, National Center for Atmospheric Research, Boulder, CO, United States, Rolando R Garcia, Natl Ctr Atmospheric Research, Boulder, CO, United States, Paul A Newman, NASA Goddard Space Flight Center, Code 610, Greenbelt, MD, United States, Sean M Davis, Chemical Sciences Division, NOAA Earth System Research Laboratory; Cooperative Institute for Research in Environmental Sciences, Boulder, United States and Karen Rosenlof, NOAA, Boulder, United States