摘要
在处理大气的长、短波辐射时常常假定粒子为球形。本文用扩展边界条件法及Ｍｏｎｔｅ－Ｃａｒｌｏ方法计算了随机取向的非球形气溶胶粒子的衰减、吸收截面、相函数、不对称因子、单次散射反照率等辐射参量，研究了形状因子及粒子表面粗糙度对这些量的影响。结果表明，随机取向的粒子形状对相函数、衰减截面产生较大的影响，但对吸收截面、不对称因子没有明显作用；用球形粒子代替非球形粒子进行辐射参数化处理将带来一定误差。这一工作对研究气溶胶的辐射及气候效应有重要价值。
We usually assume that the shape of aerosol is spherical. The parameters, including extinction and absorption cross section, phase function, single scattering albedo and asymmetry factor of non spheric aerosols with random direction, are calculated by using the extended boundary condition method and Monte Carlo method. The results indicate that the influence of the shape of aerosol on the extinction and phase function is great, but that on the absorption and asymmetry factor is not obvious. The spheric approximation of nonspheric aerosol may create errors in radiative parameterization. This work is very important for the study of radiative characteristics of aerosols and their climatic effects.
出处
《南京大学学报（自然科学版）》
CSCD
1996年第2期316-321,共6页
Journal of Nanjing University（Natural Science）
关键词
气溶胶
粒子形状
辐射特性
大气
Aerosol, shape of aerosol, radiative characteristics
