Absorption and scattering of light by ice-water mixed clouds
冰水混合云对可见光的吸收和散射特性

Based on the Mie theory, the light scattering properties in the visible regions of clouds consisting of pure water, pure ice spheres and concentric water-ice spheres are computed respectively. The reflection function and plane albedo, transmissivity, absorptivity of the three types of clouds are evaluated with the addlng-doubling method by solving the radiative transfer equation. The numerical results show that the reflection function and plane albedo of ice clouds and ice-water clouds are slightly less than those of water clouds at most scattering angles, when the transmissivity is larger. A detailed theoretical analysis of the numerical results is presented, which explains the phenomenon of cloud absorption anomaly.