1. Department of Meteorology Stockholm University Stockholm Sweden
2. Bolin Centre for Climate Research, Stockholm University Stockholm Sweden
3. Geophysical Institute, University of Bergen, and Bjerknes Centre for Climate Research Bergen Norway
4. Department of Geosciences University of Arizona Tucson AZ USA
5. NIOZ Royal Netherlands Institute for Sea Research, Department of Ocean Systems, and Utrecht University Texel The Netherlands
6. National Oceanography Centre Southampton UK