1. a Max Planck Institute for Biogeochemistry, Jena, Germany
2. b Centre for Hydrology, University of Saskatchewan, Canmore, Alberta, Canada
3. c Department of Civil and Environmental Engineering, University of Washington, Seattle, Washington
4. d Max Planck Institute for Meteorology, Hamburg, Germany
5. e Met Office, Exeter, United Kingdom
6. f ARC Centre of Excellence for Climate Extremes, University of New South Wales, Sydney, New South Wales, Australia