David Rivas, Center for Scientific Research and Higher Education at Ensenada, Ensenada, Mexico, Jaime Farber Lorda, Centro de Investigación Científica y de Educación Superior de Ensenada, Ecología, Ensenada, BJ, Mexico, Francois Counillon, Nansen Environmental and Remote Sensing Centre, Bergen, Norway and Noel S Keenlyside, Geophysical Institute, Juneau, Norway