[1] Free Univ Berlin, Phys Geog, Dept Earth Sci, D-12249 Berlin, Germany
[2] Marie Curie M4Human, I-00152 Rome, Italy
[3] Univ Osnabruck, Inst Geog, D-49074 Osnabruck, Germany
[4] Eastern Atlas GmbH & Co KG, D-13189 Berlin, Germany
[5] Univ Cologne, Inst Geog, D-50923 Cologne, Germany