Feili Li¹, M Susan Lozier¹, Naomi P Holliday², William E Johns³, Isabela Le Bras⁴, Elaine McDonagh² and Ben I Moat², (1)Duke University, Durham, NC, United States, (2)National Oceanography Centre, Southampton, United Kingdom, (3)Rosenstiel School for Marine and Atmospheric Sciences, University of Miami, Miami, FL, United States, (4)Scripps Institution of Oceanography, La Jolla, CA, United States