1. LSCE, IPSL-CNRS, Orme des Merisiers; Gif-sur-Yvette France
2. Department of Climatology; Climate Dynamics and Climate Change; Justus-Liebig University of Giessen; Giessen Germany
3. Now at Institute for Environment and Sustainability; Joint Research Centre; European Commission; Ispra Italy
4. Institute of Geography; University of Bern; Bern Switzerland