Partial support for this research is from NSF STC for “Sustainability of Semi-Arid Hydrology and Riparian Areas” (SAHRA) (Grant EAR-9876800), NASA-EOS (Grant NA56GPO185), and TRMM (Grant NAG5-7716). We are grateful to Dr. R. Adler and others of NASA GSFC for their valuable suggestions. The authors also thank the anonymous reviewers and editor for their constructive comments.
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