Magali Roberts¹, Anja Reckhardt¹, Grace A Abarike¹, Kojo Amoako¹, Jutta Niggemann¹, Hannelore Waska¹, Michael E. Böttcher², Felix Auer³, Moritz Holtappels³ and Katharina Pahnke¹, (1)Institute for Chemistry and Biology of the Marine Environment (ICBM), Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany, (2)Leibniz Institute for Baltic Sea Research Warnemünde, Warnemünde, Germany, (3)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany