This research was supported by FAPESP. This enabled Reindert Haarsma a 3-month visit at the Oceanographic Institute of the University of Sao Paulo (IOUSP) (Grant 2005/04315-0) and Edmo Campos (Grant 2006/03949-8) a 2-month visit at the KNMI in the Netherlands. The comments of two anonymous reviewers have significantly improved the manuscript.
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