1. State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering Tsinghua University Beijing China
2. Joint Institute for Regional Earth System Science and Engineering and Department of Atmospheric and Oceanic Sciences University of California Los Angeles CA USA
3. Department of Hydrology and Atmospheric sciences University of Arizona Tucson AZ USA
4. Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA
5. School of Civil Engineering and Environmental Sciences University of Oklahoma Norman OK USA