Nina Lundholm, UNITED STATES, Cora Hörstmann, Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany, Per Juel Hansen, University of Copenhagen, Copenhagen, Denmark, Bernd Krock, Alfred Wegener Insitute Helmholtz-Center for Polar and Marine Research, Bremerhaven, Germany and Uwe John, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany