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The effect of cloud optical thickness, ground surface albedo and above-cloud absorbing dust layer on the cloudbow structure

机译:云的光学厚度,地表反照率和云层以上吸尘层对云弓结构的影响

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The cloudbow structure is directly related to the retrieval of cloud droplet size distribution (droplet effective radius and effective variance). This study investigated the effect of the cloud optical thickness, ground surface albedo and the above-cloud absorbing dust layer on the cloudbow structure based on the modeled airborne directional polarimetric camera (DPC) measurements, which are simulated in 670 nm using Mie scattering theory and the vector radiative transfer mode. It is found that the polarized reflectance increase as the increase of the cloud optical thickness (COT) and saturate when COT=10. The absorbing dust layer's signal would cover the signal from the cloud layer as the aerosol optical thickness increased to 1. Additionally, the surface albedo has negligible effect on the cloudbow structure.
机译:云弓结构直接与云滴尺寸分布(液滴有效半径和有效方差)的获取有关。本研究基于模拟机载定向偏振相机(DPC)的测量结果,研究了云光学厚度,地表反照率和上云吸收尘埃层对云弓结构的影响,并使用Mie散射理论在670 nm处进行了模拟。矢量辐射传输模式。发现当COT = 10时,偏振反射率随着云光学厚度(COT)的增加而增加并且饱和。当气溶胶光学厚度增加到1时,吸收尘埃层的信号将覆盖来自云层的信号。此外,表面反照率对云弓结构的影响可忽略不计。

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