1. Centrum für Erdsystemforschung und Nachhaltigkeit; Universität Hamburg; Hamburg Germany
2. NASA Goddard Space Flight Center; Greenbelt Maryland USA
3. DTU Space; Technical University of Denmark; Copenhagen Denmark
4. Department of Earth and Environmental Science; University of Michigan; Ann Arbor Michigan USA
5. Deutsches Geodätisches Forschungsinstitut; Munich Germany
6. LEGOS, UMR 5566; Observatoire Midi-Pyrénées; Toulouse France
7. School of Marine Sciences; Nanjing University of Information Science and Technology; Nanjing China
8. SGT Inc.; NASA/GSFC; Greenbelt Maryland USA
9. College of Earth, Ocean, and Atmospheric Sciences; Oregon State University; Corvallis Oregon USA
10. Now at School of Geodesy and Geomatics; Wuhan University; Wuhan China
11. Division of Geodetic Science, School of Earth Sciences; Ohio State University; Columbus Ohio USA
12. School of Ocean Sciences; Bangor University; Menai Bridge UK
13. Department of Applied Mathematics; University of Leeds; Leeds UK
14. Surveying and Spatial Sciences Group, School of Land and Food; University of Tasmania; Hobart Tasmania Australia
15. Polar Science Center, Applied Physics Laboratory; University of Washington; Seattle Washington USA
16. Norwegian Meteorological Institute; Oslo Norway
17. Earth and Space Research; Corvallis Oregon USA
18. Oceanography Division, Naval Research Laboratory; Stennis Space Center; Hancock County Mississippi USA
19. Institute of Geodesy and Geophysics; Chinese Academy of Sciences; Wuhan China