近红外波段气溶胶粒子形状和性质对散射特性的影响

为了研究近红外波段气溶胶粒子的形状和性质对散射特性的影响,将气溶胶粒子视为非球形粒子,并用T矩阵理论对0.94 μm波段的气溶胶粒子进行了一系列计算分析.计算结果表明:进行单个气溶胶粒子的散射计算时其形状因子是不可忽视的元素,单个气溶胶粒子的散射相函数随着粒子形状的不同在前向和后向有明显变化;进行气溶胶粒子前向体散射计算时非球形粒子近似成球形粒子带来的误差较小,后向误差仍较大;气溶胶粒子性质的不同,即折射指数和数密度的不同对散射特性影响较大.

Effect of shape and character of aerosol on its near-infrared scattering characteristics

In order to study the effect of the shape and character of aerosol on its near-infrared scattering characteristics,the shape of aerosol was assumed to be non-spheric and some research was done by using the T-matrix method.The result indicates that the forward and backward phase functions change greatly with different shape for single aerosol particle's scattering,but the forward phase functions do not change much for aerosols' volume scattering. The influence of the character of aerosols,aerosols with different refractive index and number density distribution is great.This work is very important for the study of the radiative transfer in atmosphere and the development of visibility measurement based on light scattering.