Jerome Barre¹, Ilse Aben², Melanie Ades¹, Anna Agusti-panareda¹, Gianpaolo Balsamo¹, Nicolas Bousserez³, Margarita Choulga¹, Richard J Engelen⁴, Johannes Flemming¹, Antje Inness⁴, Zak Kipling⁵, Jochen Landgraf², Alba Lorente², Sebastien Massart⁶, Joe McNorton⁷, Mark Parrington¹ and Vincent-Henri Peuch¹, (1)European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom, (2)SRON Netherlands Institute for Space Research, Utrecht, Netherlands, (3)European Center for Medium-Range Weather Forecasts, Reading, United Kingdom, (4)ECMWF, Reading, United Kingdom, (5)University of Oxford, Department of Physics, Oxford, United Kingdom, (6)E.C.m.w.f., Reading, United Kingdom, (7)University of Leeds, Leeds, United Kingdom