利用主动微波遥感资料（ENVISAT/ASAR）估算的表层土壤湿度和光学遥感资料（EOS/MODIS）的地表温度信息， 结合气象站常规观测的气象要素， 利用土壤水热耦合及水分蒸发模型对黄土高原典型塬区进行了蒸散发量的估算。将估算的蒸散发量与实际观测对比表明， 两者之间绝对误差最大为117 W·m-2， 最小为0.6 W·m-2， 平均为24 W·m-2。基于微波遥感参数估算蒸散发量的方法为估算区域蒸散发量提供了一种新的思路。
A method for determing regional evapotranspiration (ET) is proposed, which is combing with regional land surface top layer soil moisture estimated from ENVISAT/ASAR, regional land surface temperature obtained from EOS/MODIS, and the micrometeorological data. And the method was used to estimate the regional ET over the typical mesa of Chinese loess plateau, the results show that the estimation of ET is very closer with the ground measurements of eddy correlation system, the maximum absolute error is 117 W·m-2, the minimum absolute error is 0.6 W·m-2, and the average error is 24 W·m-2. So, the proposed method provides a new way to estimate the regional ET in the application on land surface process.
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