1. Institute of Meteorology and Climate Research; Karlsruhe Institute of Technology; Karlsruhe Germany
2. Department of Physics; University of Murcia; Murcia Spain
3. Climate and Environmental Physics; University of Bern; Bern Switzerland
4. Oeschger Centre for Climate Change Research; University of Bern; Bern Switzerland
5. Institute of Coastal Research; Helmholtz-Zentrum Geesthacht; Geesthacht Germany