Eulàlia Gràcia¹, Ingo Grevemeyer², Rafael Bartolomé³, Hector Perea³, Sara Martinez-Loriente³, Laura Gomez de la Pena⁴, Antonio Villasenor⁵, Yann Klinger⁶, Claudio Lo Iacono⁷, Susana Díez⁸, Alcinoe Calahorrano⁹, Camafort Miquel³, Sergio Costa³, Elia D'Acremont¹⁰, Alain Rabaute¹⁰ and Cesar R Ranero¹¹, (1)Institut de Ciències del Mar (CSIC), Barcelona, Spain, (2)GEOMAR, Kiel, Germany, (3)ICM-CSIC, Barcelona, Spain, (4)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (5)ICTJA-CSIC, Barcelona, Spain, (6)Institut de Physique du Globe de Paris, Paris, France, (7)National Oceanography Centre (NOC), Marine Geoscience, Southampton, United Kingdom, (8)UTM-CSIC, Barcelona, Spain, (9)Institute of Marine Science -CSIC, Barcelona, Spain, (10)University Pierre and Marie Curie Paris VI, Paris, France, (11)ICREA at Institute of Marine Sciences-CSIC, Barcelona, Spain