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利用2012年黑河中游HiWATER实验区戈壁和大满超级站的土壤水分和温度廓线数据,基于L-MEB微波辐射传输模型,分析了L波段微波穿透深度随土壤水分的变化。在此基础上,分析了不同深度土壤水分和温度作为L-MEB模型输入,对L波段微波发射率和亮度温度的影响。研究结果表明:L波段微波穿透深度随土壤水分、温度的变化,呈现明显的差异,在本研究区L波段微波穿透深度在4~22cm之间;在土壤水分较高的超级站,计算的L波段亮度温度与0~4cm土壤层的亮度温度更为接近,而在土壤水分较低的戈壁站,计算的L波段亮度温度与0~40cm土壤层的亮度温度更为接近。因此,在利用L波段微波数据反演土壤水分时,应考虑穿透深度的影响,以提高反演精度。
Based on the L-MEB microwave radiation transmission model, the soil moisture and temperature profiles of the Gobi and Taiman Superplastic stations in the HiWATER experimental area in the middle reaches of the Heihe River in 2012 were used to analyze the variation of L-band microwave penetration depth with soil moisture. Based on this, the influence of soil moisture and temperature at different depths on L-band microwave emissivity and brightness temperature as input to L-MEB model was analyzed. The results show that the depth of microwave penetration in L band is obviously different with the change of soil moisture and temperature. The microwave penetration depth in L band in this study is between 4 and 22 cm. In the super station with higher soil moisture, The L-band brightness temperature is closer to that of 0-4 cm soil layer, while in the lower Gobi soil station, the calculated L-band brightness temperature is closer to that of 0-40 cm soil layer. Therefore, when using L-band microwave data to retrieve soil moisture, the influence of penetration depth should be considered to improve the inversion accuracy.