ESTIMATION OF SPATIALLY COMPLETE LAND SURFACE EVAPOTRANSPIRATION OVER THE HEIHE RIVER BASIN

文献类型： 外文期刊

第一作者： Liao, Qian-Yu

作者： Liao, Qian-Yu;Ren, Chao;Liao, Qian-Yu;Leng, Pei;Li, Zhao-Liang;Duan, Si-Bo;Gao, Mao-Fang;Han, Xiao-Jing;Li, Zhao-Liang;Di, Suchuang;Lu, Yajing;Xue, Wanlai

作者机构：

关键词： ET; MODIS; CLDAS; pixel-to-pixel; Penman-Monteith

期刊名称：2019 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS 2019)

ISSN： 2153-6996

年卷期： 2019 年

页码：

收录情况： SCI

摘要： Evapotranspiration (ET) plays a key role for energy transfer and water circulation in the biosphere, lithosphere, hydrosphere, cryosphere and atmosphere. In present study, spatially complete ET over the Heihe river basin, Northwest of China, was estimated from the synergistic use of MODIS (MODerate-resolution Imaging Spectroradiometer) data and CLDAS (China Meteorological Administration Land Data Assimilation) gridded meteorological data from June 1 to September 15 in 2012. For the estimation of ET over clear-sky pixels, a pixel-to-pixel pattern of land surface temperature (LST)-vegetation index (VI) feature space was developed where meteorological data were used to determine the dry and wet edges for each pixel; whereas the traditional Penman-Monteith equation was implemented to obtain ET over clouds pixels. Finally, ground ET measurements collected at two sites (corn and orchard) were used to evaluate the estimated results, root mean square error (RMSE) of 77.2W/m(2) and 74.9W/m(2) can be obtained for the two sites, respectively, indicating that spatially complete ET can be derived from currently available satellite images and meteorological data.

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