1. Department of Environmental Systems Sciences; ETH Zürich; 8092 Zurich Switzerland
2. Department of Environmental Sciences - Botany; University of Basel; 4003 Basel Switzerland
3. Institut für Erd- und Umweltwissenschaften; Universität Potsdam; 144969 Potsdam Germany
4. Section 5.1: Geomorphology; Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences; 14473 Potsdam Germany