1. Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, California
2. Univ. Brest, CNRS, IRD, Ifremer, Laboratoire d’Océanographie Physique et Spatiale, IUEM, Brest, France
3. LEGOS, University of Toulouse, IRD, CNRS, CNES, UPS, Toulouse, France