Maurício Rebouças Rocha, University of Sao Paulo, Department of Physical, Chemical, and Geological Oceanography, Sao Paulo, Brazil, Cesar B Rocha, USP University of Sao Paulo, Physical, Chemical and Gelogical Oceanography, São Paulo, Brazil, Edmo Jose Dias Campos, University of Sao Paulo, Oceanographic Institute, Sao Paulo, Brazil and Paulo S Polito, Oceanographic Institute of the University of Sao Paulo (IOUSP), Sao Paulo, Brazil