1. Institute of Physical Geography and Landscape Ecology, Leibniz University of Hannover, 30167 Hannover, Germany
2. Geodetic Institute Karlsruhe (GIK), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
3. Institute of Geo-Engineering, Clausthal University of Technology (TUC), 38678 Clausthal-Zellerfeld, Germany
4. Coordination Unit Climate and Soil, Thünen-Institute, 38116 Braunschweig, Germany