Amina Traore Schartup, Scripps Institution of Oceanography, La Jolla, CA, United States; Harvard School of Engineering and Applied Sciences, Cambridge, MA, United States, Lars-Eric Heimbürger, Mediterranean Institute of Oceanography, Marseille Cedex 09, France, Anne Soerensen, Stockholm University, Stockholm, Sweden, Jeroen Sonke, CNRS-GET, Toulouse, France and Elsie M Sunderland, Harvard University, Cambridge, MA, United States