1. U.S. Geological Survey (USGS), c/o National Oceanic and Atmospheric Administration (NOAA) Geophysical Fluid Dynamics Laboratory, Princeton, NJ 08540, USA.
2. USGS, Tucson, AZ 85745, USA.
3. Stockholm International Water Institute, SE 11151 Stockholm, Sweden.
4. USGS, Reston, VA 20192, USA.
5. Research Centre for Agriculture and Forest Environment, Polish Academy of Sciences, Poznań, Poland, and Potsdam Institute for Climate Impact Research, Potsdam, Germany.
6. University of Washington, Seattle, WA 98195, USA.
7. NOAA Geophysical Fluid Dynamics Laboratory, Princeton, NJ 08540, USA.