非均匀随机散射介质层的多次散射和热辐射的分层迭代解

Iterative layering approach to multiple scattering and emission from inhomogenous random scatter media

为纳入矢量辐射传输方程的多次散射 ,将非均匀平行分层分布的随机散射介质划分成多个薄层 ,利用各薄层的低阶Mueller矩阵解推导出整层的高阶散射迭代解 .用这一方法计算了具有占空比、粒子大小和温度廓线非均匀分布的平行分层随机密集球形粒子积雪层的极化热辐射 .数值结果与一层均匀随机散射层的离散坐标 特征值方法作了比较 ,讨论了多次散射和热辐射与散射层各特征参数的关系 。

Taking into account the multiple scattering of vector radiative transfer (VRT), an iterative layering method is developed by stratifying the random media into multi-slabs and employing the lower-order Mueller matrix solution to derive high-order scatterings. This approach is applied to the simulation of polarized brightness temperature from an inhomogeneous snowpack of randomly and densely distributed spherical particles with nonuniform profiles of particle size, fractional volume and physical temperature. Numerical results are compared with conventional eigen-analysis approach for a uniform scatter medium. The functional dependence of multiple scattering and emission upon the characteristic parameters such as particle size, fractional volume, physical temperature etc. are discussed, and are also compared with the microwave remote sensing measurements of the multi-layers snowpack.