黑河流域日蒸散发遥感估算研究  

Remote Sensing Retrieval of Daily Evapotranspirationover the Heihe River Basin

作　　者：李星敏[1,2] 卢玲[1] 李新[1] 杨文峰[3] 黄春林[1] 王钊[4] 

机构地区：[1]中国科学院寒区早区环境与工程研究所,甘肃兰州730000 [2]陕西省气象科学研究所,陕西西安710015 [3]陕西省气象台,陕西西安710015 [4]陕西省农业遥感信息中心,陕西西安710015

出　　处：《高原气象》2010年第1期109-114,共6页Plateau Meteorology

基　　金：国家自然科学基金“陆地碳循环遥感与模型模拟的融合方法研究”(40871190);“基于数据同化方法的蒸散发遥感估算及时间尺度扩展研究”(40801126)资助

摘　　要：地表蒸散的估算在干旱半干旱区水资源研究中具有重要意义。利用NOAA/AVHRR遥感资料、NCEP再分析格点资料和气象站点资料,根据能量平衡模型和FAO-17 Penman公式,计算了研究区域内逐日蒸散发量;对于晴天,用遥感模型反演出瞬时蒸散,进而推算出日蒸散;同时用FAO-17 Penmen公式和气象资料,计算研究区域内的同一天的蒸散,利用气象资料计算得到的蒸散与遥感估算的蒸散的关系,估算非晴空日的蒸散,进而得到逐日蒸散发结果。与同类研究结果的比较表明:该方法能够估算逐日蒸散发,通过气象与遥感资料结合,提高了气象格点资料的空间分辨率,弥补了难以得到遥感逐日晴空资料的不足,同时也为流域内同类研究提供参考依据。The estimation of evapotranspiration（ET） over heterogeneous land surface of arid and semiarid regions is quite complicated and significant. NOAA/AVHRR remote sensing, NCEP reanalysis grid and meteorological station data are used to estimate daily ET over the Heihe River basin based on the integrating surface energy algorithm for land model and the Penman method. As for clear days, Remote sensing model is used to retrieval the instantaneous ET to daily ET. FAO--17 Penman method is also used to estimate the same day＇s reference crop ET by NCEP reanalysis grid data and the meteorological station data. The relationship between actual ET and the reference crop ET can be used to calculate the actual ET based on the results from FAO--17 Penman method on the cloudy days. These results are validated by the observation data and other study in Heihe River basin. Integrate the remote sensing data and grid data can enhances the resolution of the NCEP grid data from 0.25 degree to 1.1 km by remote sensing data, and also make up deficiency of the remote sensing data on the cloudy days. This work will provide reference for similar research in this region.

关 键 词：黑河流域 遥感 蒸散发 

分 类 号：P414.8[天文地球—大气科学及气象学]