[1] CEA, CNRS, UMR 1572, Lab Sci Climat & Environm, F-91191 Gif Sur Yvette, France
[2] Univ Southampton, Southampton Oceanog Ctr, Southampton SO14 3ZH, Hants, England
[3] Univ Paris 06, Lab Oceanog Dynam & Climatol, F-75252 Paris 5, France
[4] Los Alamos Natl Lab, Climate Ocean & Sea Ice Modeling Porject, Los Alamos, NM 87545 USA
[5] Inst Ciencias Mar, CMIMA, CSIC, Barcelona 08003, Spain