利用DDA方法计算大气气溶胶粒子光学特性

Using the DDA method to calculate aerosol optical characteristics

大气气溶胶是大气的重要组成部分,其光学特性是研究大气辐射传输特性的重要参量.本文基于DDA方法,对不同形状气溶胶粒子的光学特性进行计算,得到气溶胶粒子的消光因子、吸收因子随波长变化的数值结果.结合Muller散射矩阵,给出了气溶胶粒子散射强度和极化度的角分布,为研究大气辐射传输提供了有效的方法.

The aerosol is a key element of atmosphere,the optical characteristics is an important parameter for the research property of atmospheric radiation and transmission. In this paper, using the DDA method,after calculating optical characteristics of the difformity aerosol particles, the author gets the relationships of extinction factor and absorption factor of aerosol particles with the changing incident wavelength,combining the Muller scattering matrix, the angular distribution of scattering intensity and polarizability of aerosol particles is given, which provides an efficient approach for the research of atmos- pheric radiation and transmission.