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为了发展雪水当量物理反演算法,本文对不同散射阶模型——零阶、一阶、多次散射模型进行敏感性试验与分析,结果表明我们必须在前向理论模型和反演模型中考虑多次散射作用。本文采用的多次散射积雪辐射理论模型——双矩阵法(Matrix Doubling)求解辐射传输方程,用致密介质理论模型(DMRT)模拟积雪发射和消光特性,用AIEM模型模拟地表辐射及作为辐射传输方程的边界条件。由于该多次散射积雪辐射理论模型的复杂性,拟发展出简单且高精度的积雪辐射参数化模型,以发展雪水当量物理反演算法。因此,在包括多次散射的积雪理论模型基础上,本文通过建立针对AMSR-E传感器参数设置的积雪辐射模拟数据库,该数据库包含了各种可能的自然积雪和地表特性参数。从而在模拟数据库基础上,本文发展了针对AMSR-E的积雪参数化模型。
In order to develop the snow water equivalent physics inversion algorithm, this paper tests and analyzes the sensitivity of different scattering order models - the zero order, the first order and the multiple scattering models. The results show that we must consider the forward theoretical model and the inversion model Multiple scattering. In this paper, the multi-scattering snow radiation theory model - Matrix Doubling is used to solve the radiative transfer equation. The dense medium theory model (DMRT) is used to simulate the snow emission and extinction characteristics. The AIEM model is used to simulate the surface radiation and radiation The boundary conditions of the transfer equation. Due to the complexity of the multiple scattering theory of snow radiation, a simple and accurate parameterization model of snow radiation is proposed to develop snow water equivalent physics inversion algorithm. Therefore, based on the snow-accumulated theoretical model with multiple scattering, this paper builds a snow-accumulated radiation simulation database for AMSR-E sensor parameters, which contains various possible natural snow cover and surface characteristics parameters. Based on the simulation database, this paper develops the snow parameterization model for AMSR-E.