The authors thank the National Aeronautics and Space Administration (NASA) for providing AMSR-E data,and the China National Meteorological Administration for providing meteorology data.This work was supported by the National Basic Research Program of China (2010CB951503),the National Natural Science Foundation of China (40930101),the Open Fund of the State Key Laboratory of Remote Sensing Science,jointly sponsored by the Institute of Remote Senning Applications of the Chinese Academy of Sciences and Beijing Normal University,China,and the Open Fund of Key Laboratory of Agrometeorological Safeguard and Applied,China Meteorological Administration. （NASA）