1. Marine Research, Finnish Meteorological Institute, Helsinki, Finland;
2. Finnish Environment Institute SYKE, Helsinki, Finland;
3. Department of Natural Sciences of Faculty of Marine Technology and Natural Sciences, University of Klaipeda, Klaipeda, Lithuania;
4. Shirshov Institute of Oceanology, Russian Academy of Sciences, Saint Petersburg, Russia;
5. Swedish Meteorological and Hydrological Institute, Norrköping, Sweden;
6. Institute of Marine Research, Bergen, Norway;
7. Bjerknes Centre for Climate Research, Bergen, Norway