Satellite-Based Estimation of Daily Average Net Radiation under Clear-Sky Conditions

查看全文 作　　者：HOU [1,2]Jiangtao;JIA [1]Gensuo;ZHAO [1]Tianbao;WANG [1]Hesong;TANG [3]Bohui

机构地区：[1]Key Laboratory of Regional Climate-Environment Research for East Asia Institute of Atmospheric Physics,Chinese Academy of Sciences;[2]University of the Chinese Academy of Sciences;[3]State Key Laboratory of Resources and Environment Information System,Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences

出　　处：《Advances in Atmospheric Sciences》索引2014年第31卷第3期,共16页

基　　金：jointly supported by the National Basic Research Program of China (973 Program; Grant No.2012CB956202 and 2009CB723904);the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No.KZCX2-EW-202-03) 摘　　要：Daily average net radiation(DANR) is an important variable for estimating evapotranspiration from satellite data at regional scales, and is used for atmospheric and hydrologic modeling, as well as ecosystem management. A scheme is proposed to estimate the DANR over large heterogeneous areas under clear-sky conditions using only remotely sensed data.The method was designed to overcome the dependence of DANR estimates on ground data, and to map spatially consistent and reasonably distributed DANR, by using various land and atmospheric data products retrieved from MODIS(Moderate Resolution Imaging Spectroradiometer) data. An improved sinusoidal model was used to retrieve the diurnal variations of downward shortwave radiation using a single instantaneous value from satellites. The downward shortwave component of DANR was directly obtained from this instantaneous value, and the upward shortwave component was estimated using satellite-derived albedo products. Four observations of air temperature from MOD07 L2 and MYD07 L2 data products were used to derive the downward longwave component of DANR, while the upward longwave component was estimated using the land surface temperature(LST) and the surface emissivity from MOD11 L2. Compared to in situ observations at the cropland and grassland sites located in Tongyu, northern China, the root mean square error(RMSE) of DANR estimated for both sites under clear-sky conditions was 37 W m-2and 40 W m-2, respectively. The errors in estimation of DANR were comparable to those from previous satellite-based methods. Our estimates can be used for studying the surface radiation balance and evapotranspiration. 关键词：卫星资料 R估计净辐射日平均晴空中分辨率成像光谱仪表面发射率均方根误差

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Satellite-Based Estimation of Daily Average Net Radiation under Clear-Sky Conditions

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