Thomas Reichler, University of Utah, Salt Lake City, UT, United States, Martin Jucker, University of New South Wales, Sydney, Australia and Darryn Waugh, Johns Hopkins Univ, Baltimore, MD, United States

Eun-Pa Lim¹, Harry Hendon², Amy H Butler³, David W J Thompson⁴, Zachary D Lawrence⁵, Adam A Scaife⁶, Theodore G Shepherd⁷, Inna Polichtchouk⁸, Hisashi Nakamura⁹, Chiaki Kobayashi¹⁰, Comer Ruth⁶, Lawrence Coy¹¹, Andrew J Dowdy¹², Rene Garreaud¹³, Paul A. Newman¹⁴ and Guomin Wang¹⁵, (1)Bureau of Meteorology, Docklands, VIC, Australia, (2)Bureau of Meteorology, Melbourne, Australia, (3)NOAA Chemical Sciences Laboratory, Boulder, CO, United States, (4)Colorado State University, Department of Atmospheric Science, Fort Collins, CO, United States, (5)NOAA Physical Sciences Laboratory, Boulder, CO, United States, (6)Met Office Hadley Centre, Exeter, United Kingdom, (7)University of Reading, Reading, RG6, United Kingdom, (8)European Center for Medium-Range Weather Forecasts, Reading, United Kingdom, (9)University of Tokyo, Research Center for Advanced Science and Technology, Tokyo, Japan, (10)Meteorological Research Institute, Ibaraki, Japan, (11)SSAI at NASA GSFC, Greenbelt, MD, United States, (12)Bureau of Meteorology, Melbourne, VIC, Australia, (13)University of Chile, Departamento de Geofísica y ​Centro de Ciencia del Clima y la Resiliencia (CR2), Santiago, Chile, (14)NASA GSFC, Code 610, Greenbelt, MD, United States, (15)Australian Bureau of Meteorology, Melbourne, Australia

Zachary D Lawrence, Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States, Judith Perlwitz, NOAA Physical Sciences Laboratory, Boulder, CO, United States, Amy H Butler, NOAA Chemical Sciences Laboratory, Boulder, CO, United States, Gloria L Manney, NorthWest Research Associates, Inc, Socorro, NM, United States, Paul A. Newman, NASA GSFC, Code 610, Greenbelt, MD, United States, Simon Lee, University of Reading, Department of Meteorology, Reading, RG6, United Kingdom and Eric Nash, Science Systems and Applications, Inc., Lanham, MD, United States

Melanie Coldewey-Egbers¹, Martin Dameris², Diego G Loyola³, Matthias Nützel⁴, Christophe Lerot⁵, Fabian Romahn¹ and Michel Van Roozendael⁵, (1)German Aerospace Center (DLR), The Remote Sensing Technology Institute (IMF), Oberpfaffenhofen, Germany, (2)German Aerospace Center DLR Oberpfaffenhofen, Institute of Atmospheric Physics, Oberpfaffenhofen, Germany, (3)German Aerospace Center (DLR), Remote Sensing Technology Institute (IMF), Oberpfaffenhofen, Germany, (4)German Aerospace Center DLR Oberpfaffenhofen, Institute for Physics of the Atmosphere, Oberpfaffenhofen, Germany, (5)Royal Belgian Institute for Space Aeronomy, Brussels, Belgium

Craig S Long, NOAA/NWS/NCEP/Climate Prediction Center, College Park, MD, United States, Jeannette Wild, NOAA NWS NCEP, Climate Prediction Center, College Park, MD, United States; Univeristy of Maryland Earth System Science Interdisciplinary Center, College Park, MD, United States and Laura Ciasto, NOAA/NWS/NCEP/Climate Prediction Center, Innovim LLC, College Park, MD, United States

Ross J Salawitch, University of Maryland, College Park, Department of Atmospheric and Oceanic Science, College Park, MD, United States, Peter von Der Gathen, Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Potsdam, Potsdam, Germany, Rigel Kivi, Finnish Meteorological Institute, Helsinki, Finland and Markus Rex, Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Potsdam, Climate Sciences | Atmospheric Physics, Potsdam, Germany

Matthew T DeLand¹, Pawan K Bhartia², Natalya A Kramarova² and Zhong Chen¹, (1)Science Systems and Applications, Inc., Lanham, MD, United States, (2)NASA Goddard Space Flight Center, Greenbelt, MD, United States

Liviu Ivanescu, University of Sherbrooke, CARTEL, Sherbrooke, QC, Canada, Norman T. O'Neill, University of Sherbrooke, Sherbrooke, QC, Canada, Jean-Pierre Blanchet, University of Quebec at Montreal UQAM, Earth and Atmospheric Sciences, Montreal, QC, Canada, Keyvan Ranjbar, University of Sherbrooke, Géomatique Appliquée, Sherbrooke, Canada and Emily M McCullough, University of Western Ontario, London, ON, Canada

Amy H Butler, NOAA Chemical Sciences Laboratory, Boulder, CO, United States, Simon Lee, University of Reading, Department of Meteorology, Reading, RG6, United Kingdom, Zachary D Lawrence, Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States; NOAA Physical Sciences Laboratory, Boulder, CO, United States and Alexey Karpechko, Finnish Meteorological Institute, Helsinki, Finland