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一种基于植被指数-地表温度特征空间的蒸散指数

, PP. 887-899

Keywords: 干旱半干旱区,HJ-1卫星,地表能量水分平衡,温度植被蒸散指数,地表蒸散发

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Abstract:

利用遥感获取的植被指数和地表温度信息,进行地表能量和水分平衡过程研究是目前陆表过程研究的前沿。根据地表能量和水分平衡原理,对地表温度(Ts)、植被指数(VI),地表蒸散发(ET)之间的空间关系进行了分析,并基于假设条件,构建了温度植被蒸散指数(TVETI)。为验证TVETI表征地表蒸散的能力,利用环境卫星数据和SEBAL模型,对SEBAL模型中各能量通量构建的蒸散指数与TVETI进行线性回归分析,从2012年4~9月6个不同日期的确定性系数分别为:0.838、0.935、0.912、0.921、0.926、0.825,TVETI能很好的表征地表蒸散能力。通过对SEBAL模型估算的ET和TVETI估算的ET进行交叉验证发现,两者大小一致性显著,TVETI可以实现区域尺度地表蒸散发的快速估算。

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