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陆地上空大气顶的辐射主要由大气散射和地表反射组成,一般地表反射的贡献要大于大气散射的贡献,使得陆地上空气溶胶的特性提取非常困难,而偏振信息只强烈依赖于散射粒子的特性,发展基于偏振信息的气溶胶反演方法是非常有效的.通过对矢量辐射传输方程求解进行研究,基于倍加累加法矢量辐射传输模式分析影响气溶胶反演的主要因素,确定多维参数查找表建立方法,利用POLDER(Polarization and Directionality of the Earth’s Reflec-tances)提供的反射率和偏振反射率数据,发展了一种利用反射率和偏振反射率查找表迭代查找反演气溶胶光学参数和地表反射率的算法,实现了对北京、香河、Dalanzadgad观测站上空气溶胶光学厚度、粒子半径、折射指数和地表反射率的反演.用AERONET(Aerosol Robotic Network)地基数据对反演结果进行了验证.
The top atmospheric radiation over land mainly consists of atmospheric scattering and surface reflection. Generally, the contribution of surface reflection is greater than the contribution of atmospheric scattering, making it very difficult to extract aerosol over land. However, the polarization information only depends strongly on the characteristics of scattering particles, It is very effective to develop the aerosol inversion method based on polarization information.By studying the solution of the vector radiation transmission equation and analyzing the main factors affecting the aerosol inversion based on the doubly cumulated vector radiative transfer model, , A method for iteratively searching for retrieved aerosol optical parameters and surface reflectance using a reflectance and polarization reflectance look-up table is developed using the reflectance and polarization reflectance data provided by POLDER (Polarization and Directionality of the Earth’s Reflec- tances) Algorithm, the retrieval of aerosol optical thickness, particle radius, refraction index and surface reflectance over Beijing, Xianghe and Dalanzadgad observatories was carried out, and the inversion results were verified by the ground data of AERONET (Aerosol Robotic Network).