不同地区的平流雾和辐射雾具有差异化的雾滴谱分布，导致雾场对光辐射具有不同的衰减特性。Mie 散射适用于描述雾场气溶胶微粒的散射与衰减，光传播遵循动态的粒子数守恒过程。采用雾滴谱分布函数修正气溶胶微粒的相位矩阵，分析了红外光在雾场气溶胶微粒团簇中的散射光偏振性。结果表明，决定雾场气溶胶微粒退偏特性的因素主要包括雾滴谱分布、雾滴折射率、吸收系数以及入射波长等。在前向散射区域内，退偏性随能见度的增加而减弱，在大部分后向散射区域内，表现出相反的趋势。

There exist various of fog drop size distributions in advection fog and radiation fog, which result in the different attenuation performances as light propagates in fog field. Mie theory can describe the scattering and attenuation of aerosol particles in fog field, while light propagation follows the principle of dynamic particles conservation. In this paper, fog drop size distribution is applied to modify the scattering phase matrix of aerosol particles, and the scattered light′ s polarization can be solved when infrared light penetrates into aerosol particle clusters. The results show that aerosol particles′ depolarization mainly depends on fog drop size distribution, fog drop refractive index, absorption coefficient and incident wavelength. In the forward-scattering area, depolarization decreases as visibility increases, while the opposite trend occurs in most backwardscattering area.