Maialen Irazoqui Apecechea, Mercator Ocean International, Ocean Climate, Toulouse,, France, Angelique Melet, Mercator Ocean International, Ocean Climate, Toulouse, France, Guillaume Reffray, Mercator Ocean International, Ocean Forecast, Toulouse, France, Rémi Thiéblemont, BRGM, 3 avenue Claude Guillemin, F-45060 Orléans, France, Orléans, France and Lorenzo Mentaschi, University of Bologna, Department of Physics and Astronomy, Bologna, Italy