Krissy Anne Reeve¹, Alexander Haumann^1,2 and Theo Spira^2,3, (1)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research, Bremerhaven, Germany, (2)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany, (3)University of Gothenburg, Department of Marine Sciences, Gothenburg, Sweden