典型草原地区地表温度的反演与敏感性分析

Analysis of inversion and sensitivity of land surface temperature in typical grassland region

准确分析地表温度变化规律,对研究草原地区水热变化及旱情监测具有重要意义。基于此利用单窗算法反演了典型草原地区不同土地利用类型的地表温度。结果表明:卫星过境时刻流域地表温度的平均值在37℃左右;与其它土地利用类型相比,水体及下垫面含水量较高的地区地表温度相对较低。为进一步探究归一化植被指数、大气平均作用温度变化对地表温度的影响,本文通过设置两个参数不同的变化情景,分析地表温度对两者变化的敏感性。结果表明:大气平均作用温度大小变化对地表温度影响更为直接,归一化植被指数对地表温度相对误差的影响较低。

The analysis of the change rule of land surface temperature has important significance for the study of hydrothermal change and the drought monitoring in grassland region.The paper inversed the land surface temperature of different land use types based on Mono-window Algorithm on the typical grass-land.The results show that the average value of land surface temperature is about 37℃ at the satellite transit time.Compared with the other land use types, the land surface temperature is lower in water body and the wet region.The paper analyzed the sensibility of land surface temperature on the change of two factors by setting up the different change scenarios of two parameters in order to probe the influence of NDVI and atmospheric average temperature on land surface temperature.The result shows that the change of atmospheric average temperature has greater impact on the land surface temperature, and the influence of NDVI on relative error of surface temperature is lower.