*Blanca Ayarzaguena¹, Andrew J. Charlton-Perez², Amy H Butler³, Peter Hitchcock⁴, Isla R. Simpson⁵, Lorenzo Polvani⁶, Neal Butchart⁷, Edwin Gerber⁸, Lesley Gray⁹, Birgit Hassler¹⁰, Pu Lin¹¹, François Lott¹², Elisa Manzini¹³, Ryo Mizuta¹⁴, Clara Orbe¹⁵, Scott Osprey⁹, David Saint-Martin¹⁶, Michael Sigmond¹⁷, Masakazu Taguchi¹⁸, Evgeny Volodin¹⁹, Singo Watanabe²⁰ (1.Departamento de Física de la Tierra y Astrofísica, Universidad Complutense de Madrid, Spain, 2.Department of Meteorology, University of Reading, UK, 3.Cooperative Institute for Environmental Sciences (CIRES)/National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Division, USA, 4.Department of Earth and Atmospheric Sciences, Cornell University, USA, 5.Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, USA, 6.Columbia University, USA, 7.Met Office Hadley Centre, UK, 8.Courant Institute of Mathematical Sciences, New York University, USA, 9.NCAS-Climate, Department of Physics, University of Oxford, UK, 10.Deutsches Zentrum für Luft-und Raumfahrt (DLR), Oberpfaffenhofen, Germany, 11.Atmospheric and Oceanic Sciences Program, NOAA, USA,, 12.Laboratoire de Météorologie Dynamique, Ecole Normale Supérieure, France, 13.Max-Planck-Institut für Meteorologie, Germany, 14.Meteorological Research Institute, Japan, 15.NASA Goddard Institute for Space Studies, USA, 16.Centre National de Recherches Météorologiques (CNRM), Université de Toulouse, Météo-France, CNRS, Toulouse, France, 17.Canadian Centre for Climate Modelling and Analysis Environment and Climate Change, Canada, 18.Department of Earth Science, Aichi University of Education, Kariya, Japan, 19.Marchuk Institute of Numerical Mathematics, Russia, 20.Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Japan)