1. Technical University of Denmark, DTU Space, Lyngby, Denmark;
2. Earth, Ocean and Ecological Sciences, University of Liverpool, Liverpool, UK;
3. National Oceanography Centre, Liverpool, UK;
4. School of Geographical Sciences, University of Bristol, Bristol, UK;
5. Institut für Geodäsie und Geoinformation, University of Bonn, Bonn, Germany;
6. Institut du Littoral et de l'Environnement, LIENSs, Université de La Rochelle-CNRS, La Rochelle, France;
7. Science, Applications and Climate Department (EOP-SME), ESA ESTEC, Noordwijk, The Netherlands;
8. LEGOS, CNRS-CNES-IRD-UPS, Toulouse, France