René Schubert¹, Franziska U Schwarzkopf¹, Burkard Baschek², Jonathan Gula³ and Arne Biastoch¹, (1)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (2)Helmholtz-Zentrum Geesthacht, Institute of Coastal Research, Geesthacht, Germany, (3)University of Brest, Laboratoire d’Océanographie Physique et Spatiale, Brest, France