气溶胶粒子形状对其辐射特性影响的研究

在处理大气的长、短波辐射时常常假定粒子为球形。本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。

EFFECT OF THE SHAPE OF AEROSOL ON ITS RADIATIVE CHARACTERISTICS

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.