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Influence of three-dimensional radiative effects on the spatial distribution of shortwave cloud reflection

机译：三维辐射效应对短波云反射空间分布的影响

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This paper examines how three-dimensional radiative effects influence the way cloud fields appear in high-resolution shortwave satellite images. To do so, it uses cloud reflectance fields simulated by a Monte Carlo radiative transfer model. This study examines the influence of the two counteracting three-dimensional mechanisms: the smoothing effect of radiative diffusion, which can reduce brightness variations, and the sharpening effect caused by thick areas intercepting extra radiation through their sides and casting shadows on the thin areas behind them, which can enhance brightness variability. The findings suggest that current high-resolution retrievals of cloud structure can be significantly biased because they do not take these effects into account. For oblique sun. high-resolution retrievals can overestimate both the scene-averaged optical thickness and the magnitude of cloud variability, and yield systematically distorted cloud shapes and artificially anisotropic cloud structures. It is shown that the biases are especially large when cloud-top height variations are present because cloud-top variations can cause a much stronger sharpening effect than internal cloud variability. To prevent erroneous interpretation of retrieval results, an algorithm is proposed to determine whether retrievals based on any satellite image are affected significantly by these biases. [References: 30]
机译：本文研究了三维辐射效应如何影响高分辨率短波卫星图像中云场的出现方式。为此，它使用由蒙特卡洛辐射传输模型模拟的云反射场。这项研究考察了两个相互抵消的三维机制的影响：辐射扩散的平滑效果（可以减少亮度变化），以及厚区域通过侧面拦截额外的辐射并在其后面的薄区域投射阴影而产生的锐化效果，可以增强亮度可变性。这些发现表明，当前对云结构的高分辨率检索可能会出现明显偏差，因为它们没有考虑这些影响。对于倾斜的太阳。高分辨率检索可以高估场景平均的光学厚度和云变化的幅度，并且会产生系统失真的云形状和人工各向异性的云结构。结果表明，当出现云顶高度变化时，偏差特别大，因为云顶变化会比内部云朵变化引起更强的锐化效果。为了防止错误解释检索结果，提出了一种算法来确定基于任何卫星图像的检索是否受到这些偏差的显着影响。 [参考：30]

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