1. Laboratoire des Ecoulements Géophysiques et Industriels, CNRS/UJF/INPG, Grenoble, France
2. Laboratoire des Ecoulements Géophysiques et Industriels, CNRS/UJF/INPG, Grenoble, France, and Department of Oceanography, The Florida State University, Tallahassee, Florida
3. Climate Change Research Center, University of New South Wales, Sydney, New South Wales, Australia