Meike Becker^1,2, Are Olsen^1,2, Agneta Fransson³, Peter Landschuetzer⁴, Abdirahman Omar^2,5, Gregor J Rehder⁶, Christian Rödenbeck⁷ and Ingunn Skjelvan^2,5, (1)University of Bergen, Geophysical Institute, Bergen, Norway, (2)Bjerknes Centre for Climate Research, Bergen, Norway, (3)Norwegian Polar Institute, Oceanography, Tromso, Norway, (4)Max Planck Institute for Meteorology, Hamburg, Germany, (5)Norce, Bergen, Norway, (6)Leibniz Institute for Baltic Sea Research, Department of Marine Chemistry, Rostock, Germany, (7)Max Planck Institute for Biogeochemistry, Jena, Germany