考虑地表反射类型的气溶胶散射偏振特性

采用逐次阶散射法求解矢量辐射传输方程来研究气溶胶在不同地表反射模型下的散射偏振特性.首先,选取单一地表反射模型和耦合地表反射模型两种地表反射模型.然后,根据地表反射模型计算得到相应的地表反射率,进而采用逐次阶散射法对矢量辐射传输方程进行求解,得到散射光的Stokes矢量.最后,由Stokes矢量计算得出散射光的偏振度.仿真结果表明,两种地表反射模型下气溶胶单次散射的散射辐射强度和线偏振度均相等;耦合地表反射模型的总散射辐射强度和线偏振度总是大于单一地表反射模型;单一地表反射模型的气溶胶单次散射相对总散射的贡献总是大于耦合地表反射模型.研究结果对气溶胶光学特性的反演具有一定意义.

Aerosols Scattering Polarization Characteristics Based on Different Surface Reflection Type

By solving the vector radiation transmission equation with the successive order of scattering method,the polarization characteristics of the light scattered by the atmosphere aerosols under different earth surface reflection models are studied.Two surface reflection models,single surface reflection and coupled surface reflection,are used in the numerical simulations.The reflectivity of earth surface is obtained according the corresponding model.The Stokes vector of the scattered light is derived by solving the vector radiation transmission equation with successive order of scattering method.Furthermore,the polarization degree of the scattered light is calculated.The simulation results show that the scattering radiation intensities of the first scattering order are equal for the two earth surface models.It is the same case for polarization degree of the first scattering order light.On the other hand,the total scattering radiation intensity of the coupled surface reflection model is larger than that of the single surface reflection model;The contribution of the first scattering light of the coupled model is smaller than that of the single reflection model.The results are of significance to the inversion of aerosol optical properties.