物理学报Issue(22)：1-12,12.DOI:10.7498/aps.64.224205
取向比对椭球气溶胶粒子散射特性的影响∗
Influence of asp ect ratio on the light scattering prop erties of spherical aerosol particles
摘要
Abstract
The influence of aspect ratio on the light scattering properties of ellipsoidal particles is studied by using T-matrix method and discrete ordinate method in this paper. The light scattering characteristic quantities including extinction efficiency, asymmetrical parameter, single scattering albedo, scattering phase matrix, and bidirectional reflectance dis-tribution function (BRDF) are computed. It is found that light scattering properties of ellipsoidal particles are sensitive to aspect ratio. The aspect ratio can influence the oscillation frequencies and amplitudes of the scattering parameters except some special size parameters. The value of asymmetrical factor could be as large as 0.3 in wave crest value of size parameter while it is no more than 0.1 at the balance location. As for the multiple scattering, the characteristics of BRDF for different aspect ratios in different incident angles and optical thickness values are analyzed, and for a further study, the relative differences of BRDF influenced by aspect ratio, optical thickness, and incident angle are analyzed. The results show that the variation trends of BRDF for the ellipsoidal particles with various aspect ratios are basically the same. However, the curve of BRDF of spherical particles (i.e., with their aspect ratios being 1) is more variable. With the increasing of aerosol optical thickness and aspect ratio, the curves of BRDF at different aspect ratios for ellipsoidal particles tend to a steady and similar value and the relative difference of BRDF decreases. But with the increasing of aerosol optical depth, the relative difference of BRDF increases with the increasing of incident angles, especially in large optical thickness, the value of the relative difference of BRDF can be as large as 15%.关键词
椭球粒子/取向比/T矩阵/双向反射函数Key words
ellipsoidal particle/aspect ratio/T-matrix/bidirectional reflectance distribution function引用本文复制引用
张学海,魏合理,戴聪明,曹亚楠,李学彬..取向比对椭球气溶胶粒子散射特性的影响∗[J].物理学报,2015,(22):1-12,12.基金项目
国家自然科学基金(批准号:61077081)和国家自然科学基金青年基金(批准号:41105021)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant No.61077081) and the Young Scientists Fund of the National Natural Science Foundation of China (Grant No.41105021) （批准号:61077081）
