1. Norwegian Polar Institute, Fram Centre; Tromsø Norway
2. Geophysical Institute, University of Bergen and Bjerknes Centre for Climate Research; Bergen Norway
3. LOCEAN, Université Pierre et Marie Curie; Paris Cedex France
4. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research; Bremerhaven Germany
5. GEOMAR, Helmholtz Centre for Ocean Research; Kiel Germany