Parameterization of the Aerosol Upscatter Fraction as Function of the Backscatter Fraction and Their Relationships to the Asymmetry Parameter for Radiative Transfer Calculations
Parameterization of the Aerosol Upscatter Fraction as Function of the Backscatter Fraction and Their Relationships to the Asymmetry Parameter for Radiative Transfer Calculations
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气溶胶上散射分数作为后向散射分数函数的参数化及其与辐射传输计算的不对称参数的关系
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
J. Ogren
中科院分区：
文献类型：
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作者：
H. Moosmüller;J. Ogren
气溶胶辐射强迫的简单分析近似通常包含气溶胶上散射分数（散射到上半球的散射光分数），而环境测量通常产生反向散射分数，散射相函数的理论计算通常产生不对称参数。因此，与这三个参数相关的简单分析关系和参数化对于辐射传输计算非常有价值。在这里，我们回顾了已发表的参数化（主要基于 Henyey-Greenstein 相函数），并评估它们的优点和有效性范围。此外，我们还提供了新的参数化，这些参数化在环境大气中可能遇到的反向散射分数的整个范围内（即 0 到 0.5）都有效。
Simple analytical approximations for aerosol radiative forcing generally contain the aerosol upscatter fraction (the fraction of scattered light that is scattered into the upper hemisphere), while ambient measurements generally yield the backscatter fraction, and theoretical calculations of scattering phase functions often yield the asymmetry parameter. Therefore, simple analytical relationships and parameterizations relating these three parameters are very valuable for radiative transfer calculations. Here, we review published parameterizations, mostly based on the Henyey-Greenstein phase function, and evaluate their goodness and range of validity. In addition, we give new parameterizations that are valid over the full range of backscatter fractions that are possibly encountered in the ambient atmosphere (i.e., 0 to 0.5).