1. European Commission, Joint Research Centre (JRC), Ispra, Italy.
2. Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland.
3. Max Planck Institute for Biogeochemistry, Jena, Germany.
4. Wyss Academy for Nature, University of Bern, Bern, Switzerland.
5. Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland.
6. Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland.