1. a Department of Physical Geography , University of Freiburg , Werderring 4, D-79085, Freiburg, Germany E-mail:
2. b Meteorological Institute, University of Freiburg , Werderring 10, D-79085, Freiburg, Germany
3. c Department of Modern History , University of Barcelona , Baldiri Reixac, E-08028, Barcelona, Spain