1. a Max Planck Institute for Meteorology, Hamburg, Germany
2. b Department of Meteorology, University of Reading, Reading, United Kingdom
3. c Institute of Geography, University of Bern, Bern, Switzerland
4. d Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
5. e Uni Climate, Uni Research, and Bjerknes Centre for Climate Research, Bergen, Norway