1. Institute for Atmospheric and Climate Science ETH; Zurich Switzerland
2. Physikalisch-Meteorologisches Observatorium Davos and World Radiation Center; Davos Switzerland
3. Climate and Environment Physics, Physics Institute; University of Bern; Bern Switzerland
4. Oeschger Centre for Climate Change Research; University of Bern; Bern Switzerland
5. Institute of Geography; University of Bern; Bern Switzerland
6. Surface Waters Group, Eawag: Swiss Federal Institute of Aquatic Science and Technology; Surface Waters Group; Dubendorf Switzerland