Calculations of reflected solar radiation in crystal clouds composed of horizontally oriented plates or Parry columns are presented. The radiation intensity was simulated for a limited set of observation and illumination conditions using the optical characteristics of clouds calculated by the geometric optics method for particles with shape parameters 0.1 (plates) and 2.5 (Parry columns).
We present a statistical algorithm for calculating the mean intensity of reflected solar radiation in limb sensing geometry taking into account the effects of the stochastic geometry of liquid-water clouds. It is shown that the 3D cloud effects determine the main regularities of the formation of solar radiation brightness fields when changing a perigee height from the level of the underlying surface to the cloud top. A comparison of the intensities in the clear sky, overcast and broken clouds for different perigee heights and illumination conditions is carried out (visible range).
We consider the algorithm and results of numerical simulation of irradiance at the Earth’s surface E in the spectral range of 0.4-0.7 μm in the aerosol-molecular atmosphere and in the presence of isolated cloud. We analyze the differences in the irradiance E in the clear-sky and little cloudy atmosphere in dependence of optical and geometrical parameters of cloud, its position relative to the receiver and the illumination conditions.
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