Fabrice Ardhuin^1,2, Craig Donlon³, Jamie Shutler⁴, Peter Brandt⁵, Erik van Sebille⁶, Marie-Helene Rio⁷, Alessandro Battaglia⁸, Fabrice Collard⁹, Geir Engen¹⁰, Paco Lopez Dekker¹¹, Adrien CH Martin¹², Detlef Stammer¹³, Michel Tsamados¹⁴, Ernesto Rodriguez¹⁵, Bjorn Rommen¹⁶, Tania G D Casal¹⁷, Gerhard Ressler¹⁸, Gérald Dibarboure¹⁹, Francois Boy¹⁹, Pierre Dubois²⁰, François Soulat²⁰, Clement Ubelmann¹⁵, Bertrand Chapron²¹, Lucile Gaultier²², Frederic Nouguier²³, Jean-Marc Delouis²⁴, Goulven Monnier²⁵, Stéphane Méric²⁶, Charles Peureux^24,27, Mickael Accensi²⁴, Victor Onink²⁸, Philippe Delandmeter²⁹, Erik de Witte¹⁸, Martin Suess³⁰, Paolo Bensi³¹, Christophe Maes³² and Sophie E Cravatte³³, (1)CNRS, Laboratoire d'Oceanographie Physique et Spatiale (LOPS), UMR6523 CNRS/IFREMER/IRD/UBO, Paris Cedex 16, France, (2)University of California, San Diego, Scripps Institution of Oceanography, La Jolla, United States, (3)European Space Agency, ESTEC/EOP-SME, Noordwijk, Netherlands, (4)University of Exeter, Centre for Geography, Environment and Society, Penryn, United Kingdom, (5)GEOMAR, Kiel, Germany, (6)Universiteit Utrecht, Marine & Atmospheric Research, Utrecht, Netherlands, (7)European Space Research Institute, Frascati, Italy, (8)University of Leicester, Leicester, United Kingdom, (9)Organization Not Listed, Washington, DC, United States, (10)Northern Research Institute, Tromsø, Norway, (11)Delft University of Technology, Delft, Netherlands, (12)National Oceanography Center, Southampton, United Kingdom, (13)University of Hamburg, Hamburg, Germany, (14)UCL CPOM, London, United Kingdom, (15)Jet Propulsion Laboratory, Pasadena, CA, United States, (16)European Space Agency, Noordwijk, Netherlands, (17)ESA/ESTEC, Noordwijk, Netherlands, (18)European Space Agency, Nordwijk, Netherlands, (19)CNES French National Center for Space Studies, Toulouse Cedex 09, France, (20)CLS Collecte Localisation Satellites, Ramonville St Agne, France, (21)IFREMER, Univ. Brest, CNRS, IRD, Laboratoire d'Océanographie Physique et Spatiale, Brest, France, (22)OceanDataLab, Brest, France, (23)IFREMER, Laboratoire d'Oceanographie Physique et Spatiale (LOPS), UMR6523 CNRS/IFREMER/IRD/UBO, Brest, France, (24)LOPS, Brest, France, (25)Scalian, Rennes, France, (26)Université de Rennes 1, Institut d'Electronique et des Télécommunications de Rennes, CNRS UMR 6164, Rennes, France, (27)IFREMER, Plouzané, France, (28)University of Bern, Climate and Environmental Sciences, Bern, Switzerland, (29)Utrecht University, Utrecht, Netherlands, (30)European Space Research and Technology Centre, Noordwijk Zh, Netherlands, (31)European Space Research and Technology Centre, Noordwijk, Netherlands, (32)UBO, CNRS, IRD, Ifremer, Laboratoire d'Océanographie Physique et Spatiale, Plouzané, France, Plouzane, France, (33)LEGOS, Université de Toulouse, (IRD, CNES, CNRS, UPS), Toulouse, France