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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Global Sensitivity Analysis of the L-MEB Model for Retrieving Soil Moisture
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Global Sensitivity Analysis of the L-MEB Model for Retrieving Soil Moisture

机译：L-MEB反演土壤水分的全局敏感性分析

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摘要

A global sensitivity analysis utilizing the extended Fourier amplitude sensitivity test is used to determine the parameter sensitivity of the L-band microwave emission of the biosphere (L-MEB) model. The results are analyzed from two perspectives of calibration and inversion. First, the parameters of surface soil moisture, soil roughness factor, vegetation optical depth at nadir, and effective land surface temperature are the four most sensitive parameters in the L-MEB model, demonstrating their possibility to be retrieved in the multiparameter retrieval approaches. Then, the high total sensitivity index (TSI) values of surface soil temperature in the analyses emphasize the importance of high-precision land surface temperature data in the surface soil moisture retrievals, especially for rougher or more vegetated surface conditions. Finally, our analysis indicates that TSI values are high for the soil surface roughness and vegetation optical depth model parameters but low for the vegetation structure, single scattering albedo, and soil roughness coefficient model parameters at incidence angles near nadir. This suggests that calibration experiments performed at small incidence angles may be appropriate for some but not all of the model parameters, which characterize the effect of soil surface roughness and vegetation on the terrestrial brightness temperature. Consequently, new calibration procedures that account for the different relative sensitivities of these model parameters at larger incidence angles may need to be developed in the future.
机译：使用扩展傅里叶幅度灵敏度测试的全局灵敏度分析用于确定生物圈（L-MEB）模型的L波段微波发射的参数灵敏度。从校准和反演两个角度分析了结果。首先，地表土壤水分，土壤粗糙度因子，最低点处的植被光学深度和有效地表温度等参数是L-MEB模型中四个最敏感的参数，这表明它们可以在多参数检索方法中检索。然后，分析中较高的地表土壤温度总灵敏度指数（TSI）值强调了高精度地表温度数据在地表土壤水分反演中的重要性，尤其是对于较粗糙或植被较多的地表条件。最后，我们的分析表明，在接近最低点的入射角下，土壤表面粗糙度和植被光学深度模型参数的TSI值较高，而植被结构，单散射反照率和土壤粗糙度系数模型参数的TSI值较低。这表明以小入射角进行的校准实验可能适用于某些而非全部模型参数，这些参数表征了土壤表面粗糙度和植被对地面亮度温度的影响。因此，将来可能需要开发新的校准程序，以解决这些模型参数在较大入射角时的不同相对灵敏度。

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