Stephan Krisch, Technical University of Braunschweig, Institute of Geoecology, Braunschweig, Germany, Eric P Achterberg, GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany, Edward A Boyle, Massachusetts Institute of Technology, Cambridge, MA, United States, Harald Biester, Technical University of Braunschweig, Institute for Geoecology, Environmental Geochemistry Group, Braunschweig, Germany, Manuel Colombo, Virginia Institute of Marine Science, Gloucester Point, United States, Jay T. Cullen, University of Victoria, School of Earth and Ocean Sciences, Victoria, BC, Canada, Rob Middag, Royal Netherlands Institute for Sea Research, Department of Ocean Systems, Den Burg, Netherlands, Arianna Olivelli, Flanders Marine Institute (VLIZ), Ostend, Belgium and Birgit Rogalla, British Antarctic Survey, Cambridge, United Kingdom