Area-Average Solar Radiative Transfer in Three-Dimensionally Inhomogeneous Clouds: The Independently Scattering Cloudlet Model
Area-Average Solar Radiative Transfer in Three-Dimensionally Inhomogeneous Clouds: The Independently Scattering Cloudlet Model
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三维不均匀云中的面积平均太阳辐射传输：独立散射云模型
DOI：
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发表时间：
2002
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通讯作者：
G. Petty
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文献类型：
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作者：
G. Petty
本文提出了一种新的概念和计算基础，用以重新规范化三维非均匀云体或云层的单次散射和消光特性（光学厚度、单次散射散射系数、散射相函数或不对称参数），从而描述一个辐射等效的均匀云体或云层。重正化可以允许使用标准均匀（例如，平面平行）辐射传递代码。在独立散射微云（ISC）模型中，随机分布在整个体积中的宏观“微云”被视为离散的散射体，类似于单个云滴，但由于内部多次散射而具有修改的单散射特性。如果一个体积只包含光学薄的云，体积的重正化单散射属性恢复到固有值和均匀的情况下是recove.
Abstract A new conceptual and computational basis is described for renormalizing the single-scatter and extinction properties (optical depth, single-scatter albedo, and scattering phase function or asymmetry parameter) of a three-dimensionally inhomogeneous cloud volume or layer so as to describe a radiatively equivalent homogeneous volume or layer. The renormalization may allow area-averaged fluxes and intensities to be efficiently computed for some inhomogeneous cloud fields using standard homogeneous (e.g., plane parallel) radiative transfer codes. In the Independently Scattering Cloudlet (ISC) model, macroscopic “cloudlets” distributed randomly throughout a volume are treated as discrete scatterers, analogous to individual cloud droplets but with modified single-scatter properties due to internal multiple scattering. If a volume encompasses only cloudlets that are optically thin, the renormalized single-scatter properties for the volume revert to the intrinsic values and the homogeneous case is recove...