Random fields of broken clouds and their associated direct solar radiation, scattered transmission and albedo

S. Prigarin, B. A. Kargin, U. Oppel
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引用次数: 20

Abstract

To model fields of broken clouds, we consider two methods based on Gaussian random fields and one method based on truncated random paraboloids. These models are determined by a few parameters only: the amount of cloud, the mean cloud base diameter and the mean cloud height. A field of broken clouds is a realization of such a random field, it is obtained by stochastic simulation and special spectral methods for Gaussian fields. The direct solar radiation S, the scattered transmission T and the albedo A of such a field of broken clouds are obtained by solving the stationary radiation transfer equation. Numerically we do this by variance reduction Monte Carlo methods. Varying the cloud parameters, the angle of incidence of the solar radiation we get interesting new functional relations between S, T and A for visible and infrared wavelengths.
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破碎云的随机场及其相关的太阳直接辐射、散射透射和反照率
为了对破碎云场进行建模,我们考虑了两种基于高斯随机场的方法和一种基于截断随机抛物面的方法。这些模式仅由几个参数决定:云量、平均云底直径和平均云高。破碎云场就是这种随机场的一种实现,它是通过对高斯场的随机模拟和特殊的谱方法得到的。通过求解稳态辐射传输方程,得到该破碎云场的太阳直接辐射S、散射透射T和反照率A。在数值上,我们通过方差减少蒙特卡罗方法来做到这一点。改变云层参数,太阳辐射入射角,得到可见光和红外波长S、T和A之间有趣的新函数关系。
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