1. Geophysical Fluid Dynamics Laboratory National Oceanic and Atmospheric Administration Princeton NJ USA
2. National Centre for Atmospheric Science, Department of Meteorology University of Reading Reading UK
3. Climate and Global Dynamics Laboratory National Center for Atmospheric Research Boulder CO USA
4. Physical Oceanography Department Woods Hole Oceanographic Institution Woods Hole MA USA
5. School of Ocean and Earth Science, National Oceanography Centre University of Southampton Southampton UK
6. School of Oceanography and Department of Atmospheric Sciences University of Washington Seattle WA USA
7. Atmospheric and Environmental Research, Inc. Lexington MA USA