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冰川冻土  2014 

基于涡动相关仪验证的SEBS模型对黑河中游地表蒸散发的估算研究

DOI: 10.7522/j.issn.1000-0240.2014.0184, PP. 1538-1547

Keywords: MODIS,蒸散发,地表通量,空间异质性,黑河中游

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Abstract:

在我国西北干旱和半干旱地区,农业收获主要依靠灌溉保证,灌溉绿洲的蒸散发(ET)是当地水资源的主要消耗.通过遥感估算区域灌溉绿洲的ET对于地区合理利用水资源极其重要,利用MODIS/Terra影像,基于物理过程的地表能量平衡模型(SEBS),结合WRF模式输出的气候驱动数据和地面观测数据来估算黑河中游地区的地表通量和日蒸散发(ETdaily).估算的ET用不同下垫面的涡动相关仪观测数据进行验证,结果显示SEBS模型估算的不同下垫面的ETdaily具有很好的拟合效果(R2=0.96,Pdaily比实测值偏高,说明干旱、半干旱地区灌溉绿洲土壤水分胁迫是影响ET的主要因素.模型估算绿洲作物生长期间的ETdaily和实测的ETdaily平均相对误差为12.5%,精度在观测的能量不闭合误差以内且精度比戈壁和沙漠地区高.

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