1. University of Arizona, Department of Hydrology and Atmospheric Sciences, Tucson, Arizona
2. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California
3. National Hydrology Research Center, Environment Canada, Saskatoon, Saskatchewan, Canada
4. NASA Goddard Space Flight Center, Greenbelt, Maryland
5. Earth System Science Interdisciplinary Center, University of Maryland, College Park, Maryland