1. Institute for Atmospheric and Climate Science; ETH Zurich; Zurich; Switzerland
2. Max-Planck Institute for Biogeochemistry; Jena; Germany
3. Laboratoire des Sciences du Climat et de l'Environnement, LSCE; Gif-sur-Yvette; France
4. Institute of Plant Sciences; ETH Zurich; Zurich; Switzerland
5. Agroscope ART; Zurich; Switzerland
6. Forest Services and Agency for the Environment; Bolzano; Italy
7. Complex Systems Research Center; University of New Hampshire; Durham; New Hampshire; USA
8. Institute of Ecology; University of Innsbruck; Innsbruck; Austria