1. Institute for Atmospheric and Climate Science; ETH Zurich; Zürich Switzerland
2. German Federal Institute of Hydrology; Koblenz Germany
3. Département Environnement et Agro-Biotechnologies (EVA); Centre de Recherche Publi - Gabriel Lippmann, Belvaux Luxembourg
4. Swiss Federal Institute for Forest; Snow and Landscape Research WSL; Birmensdorf Switzerland