Pia Goecke¹, Leo Middleton¹, Anna Wahlin¹ and Oliver Wurl², (1)University of Gothenburg, Department of Marine Sciences, Gothenburg, Sweden, (2)Carl von Ossietzky Universität Oldenburg, Center for Marine Sensors (ZfMarS), Institute for Chemistry and Biology of the Marine Environment (ICBM), Wilhelmshaven, Germany