1. UC Center for Hydrologic Modeling, University of California, Irvine, CA 92697, USA.
2. Department of Earth System Science, University of California, Irvine, CA 92697, USA.
3. Department of Civil and Environmental Engineering, University of California, Irvine, CA 92697, USA.
4. Hydrological Sciences Laboratory, NASA Goddard Space Flight Center, Code 617, Greenbelt, MD 20771, USA.