Swiss Federal Institute for Forest Snow and Landscape Research WSL 8903 Birmensdorf Switzerland;
Swiss Federal Institute for Forest Snow and Landscape Research WSL 8903 Birmensdorf Switzerland;
University of Jyväskylä FI-40014 Jyväskylä Finland;
Swiss Federal Institute for Forest Snow and Landscape Research WSL 8903 Birmensdorf Switzerland;
Swiss Federal Institute for Forest Snow and Landscape Research WSL 8903 Birmensdorf Switzerland;
Swiss Federal Institute for Forest Snow and Landscape Research WSL 8903 Birmensdorf Switzerland;