Thomas H. Badewien, University of Oldenburg, Institute for Chemistry and Biology of the Marine Environment, Wilhelmshaven, Germany, Jens Meyerjürgens, University of Oldenburg, ICBM, Oldenburg, Germany, Emil V. Stanev, Helmholtz-Zentrum Geesthacht, Institute of Coastal Research, Geesthacht, Germany and Oliver Zielinski, University of Oldenburg, Marine Sensor Systems Group, Institute for Chemistry and Biology of the Marine Environment, Oldenburg, Germany