中文摘要：

为解决目前常用遥感蒸散发模型干、湿限选取不确定性导致蒸散发反演结果存在的空间歧义性,对遥感蒸散发模型干限、湿限进行重新定义。对干湿限进行垂向一维热扩散数值模拟,以验证重新定义的干湿限能量分配假设及部分重要遥感参数取值的合理性。利用疏勒河流域地下水均衡试验场土壤剖面温度数据对干限温度进行验证,均方根误差为1.68K;利用参考作物蒸散量对湿限蒸散量进行验证,线性回归确定性系数约为0.90。研究结果表明：重新定义的干湿限推导求解方案合理,有助于避免遥感蒸散发模型中的空间歧义性。

英文摘要：

This study redefines the dry and wet limits used in most remote sensing evapotranspiration （ET） models to resolve the spatial ambiguity resulting from uncertainties in the dry and wet limits. Numerical simulations of one dimensional thermal diffusion in the vertical direction verify the energy partition assumption and other important parameters used for the redefined dry and wet limits. Measured soil temperature profiles in the Field Experimental Station of Groundwater Balance of the Shule River Basin were used to validate the simulated temperatures given by the redefined dry limit, with a root-mean-square error of 1.68 K. Reference crop evapotranspiration （ET0） was used to validate the simulated evapotranspiration given by the redefined wet limit, with a linear regression coefficient of about 0.90. This numerical study supports the validity of the redefined dry and wet limits, which should reduce the spatial ambiguity in remote sensing ET models.