Blandine Gorce, Institut Pierre Simon Laplace LOCEAN, Paris, France, Etienne Meunier, INRIA, Paris, France, Luther Ollier, Laboratoire d’Océanologie et de Géosciences (LOG), Wimereux, France, David Kamm, LOCEAN, Paris Cedex 05, France and Julie Deshayes, Institut Pierre Simon Laplace, LOCEAN, Paris, France