1. Department of Geological Sciences; University of Alabama; Tuscaloosa Alabama USA
2. Department of Atmospheric and Oceanic Sciences; University of California; Los Angeles California USA
3. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research; Chinese Academy of Sciences; Beijing China
4. Department of Mathematics and Statistics; University of Otago; Dunedin New Zealand
5. College of Mechanics and Materials, State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering; Hohai University; Nanjing China
6. Division of Hydrologic Sciences; Desert Research Institute; Las Vegas Nevada USA
7. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering; Hohai University; Nanjing China