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采用星载微波辐射计AMSR-E的低频C波段(6.925GHz),改进了山区微波辐射传输方程,以中国青藏高原地区为例,研究山区可能产生的多种地形效应对微波辐射特征以及土壤水分反演的影响。结果表明,地形效应使得垂直极化亮温最多衰减达到16K,水平极化的亮温最大增强了18K,土壤水分在地形的影响下将被高估超过最大允许误差4%。最后,利用地形效应模拟模型计算的山区地表有效发射率,为山区土壤水分的反演提出了可行的地形校正方法。
The low frequency C band (6.925GHz) of AMSR-E is used to improve the microwave radiation transmission in the mountain. Taking the Qinghai-Tibet Plateau of China as an example, the effects of various topographic effects on microwave radiation and soil moisture The impact of inversion. The results show that the topographic effect makes the maximal attenuation of vertical polarized bright temperature up to 16K and the maximum brightness of horizontal polarization enhanced by 18K. The soil moisture will be overestimated over the maximum allowable error by 4% under the influence of the terrain. Finally, the terrain effect simulation model is used to calculate the effective emissivity of the mountain surface, and a feasible method of terrain correction is proposed for the inversion of soil moisture in the mountainous area.