Fehmi Ahmad Dilmahamod, GEOMAR Helmholtz Centre for Ocean Research Kiel, Oceanography, Kiel, Germany, Johannes Karstensen, Helmholtz Centre for Ocean Res, Kiel, Germany, Heiner Dietze, GEOMAR, Kiel, Germany, Ulrike Löptien, GEOMAR Helmholtz-Zentrum für Ozeanforschung, Kiel, Germany and Katja Fennel, Dalhousie University, Department of Oceanography, Halifax, NS, Canada