Jonas Von Bismarck¹, Tommaso Parrinello¹, Anne Grete Straume-Lindner², Thomas Kanitz³, Oliver Reitebuch⁴, Lars Isaksen⁵, Ad Stoffelen⁶, Mark R Drinkwater⁷, Anders Elfving², Michael Rennie⁸, Sebastian Bley⁹, Thorsten Fehr¹⁰, Frank de Bruin², Peggy Fischer⁹, Denny Wernham², Fabio Buscaglione⁹, Rune Floberghagen¹, Juan Piñiero¹¹, Alain Dabas¹², Pierre Vogel¹³ and Chistian Retscher⁹, (1)European Space Agency, Frascati, Italy, (2)ESA, Noordwijk, Netherlands, (3)European Space Research and Technology Centre, Noordwijk, Netherlands, (4)DLR, Institute of Atmospheric Physics, Oberpfaffenhofen, Germany, (5)European Center for Medium-Range Weather Forecasts, Reading, United Kingdom, (6)Royal Netherlands Meteorological Institute, De Bilt, Netherlands, (7)European Space Agency - ESTEC, Noordwijk Zh, Netherlands, (8)ECMWF, Reading, United Kingdom, (9)ESA, Frascati, Italy, (10)European Space Research and Technology Centre, Noordwijk Zh, Netherlands, (11)ESA, Darmstadt, Germany, (12)Météo-France, Toulouse, France, (13)European Space Agency, Noordwijk, Netherlands