Jan Saynisch¹, Julien Baerenzung², Christopher Irrgang³ and Maik Thomas^1,4, (1)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, (2)University of Potsdam, Potsdam, Germany, (3)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Geodesy and Remote Sensing, Potsdam, Germany, (4)Institute of Meteorology, Freie Universität Berlin, Berlin, Germany, Berlin, Germany