1. NERC Centre for Ecology and Hydrology, Penicuik, UK
2. CNRS, University Pierre et Marie Curie (UPMC), Paris, France
3. Department of Environmental Sciences, University of Virginia, Charlottesville, VA, USA
4. Department of Biogeochemistry, Stanford University, Stanford, CA, USA
5. PBL Netherlands Environmental Assessment Agency, Utrecht University, Utrecht, The Netherlands
6. Institute for Meteorology and Climate Research (IMK-IFU), Garmisch-Partenkirchen, Germany
7. European Commission, Joint Research Centre, Ispra, Italy
8. School of Geosciences, University of Edinburgh, Edinburgh, UK
9. International Institute for Applied Systems Analysis (IIASA), Laxenburg, Austria
10. Leibniz Institute of Baltic Sea Research, Warnemünde, Rostock, Germany