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首页> 外文期刊>Applied optics >RELATIONSHIP BETWEEN ASYMMETRY PARAMETER AND HEMISPHERIC BACKSCATTER RATIO - IMPLICATIONS FOR CLIMATE FORCING BY AEROSOLS
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RELATIONSHIP BETWEEN ASYMMETRY PARAMETER AND HEMISPHERIC BACKSCATTER RATIO - IMPLICATIONS FOR CLIMATE FORCING BY AEROSOLS

机译：非对称参数与半球背向散射比的关系-气溶胶气候强迫的意义。

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Calculations of direct climate forcing by anthropogenic aerosols commonly use radiative transfer parameters, including asymmetry parameter g. One method of obtaining the asymmetry parameter of a particle population is to convert measured values of the hemispheric-to-total-scatter ratio (backscatter ratio b) into their corresponding g values. We compare a conversion derived from Mie calculations with one derived from the Henyey-Greenstein (HG) phase function to show that the HG method systematically overestimates g for typical size distributions of accumulation-mode aerosols. A delta-Eddington radiative transfer calculation is used to show that a 10% overestimation of g can systematically reduce climate forcing as a result of aerosols by 12% or more. Mie computations are used to derive an empirical relationship between backscatter ratio and asymmetry parameter for log-normal accumulation-mode aerosols. This relationship can be used to convert the backscatter ratio to the asymmetry parameter, independent of geometric mean diameter D-gv or complex refractive index m, but the conversion requires knowledge of the breadth sigma(g) of the size distribution. [References: 23]
机译：人为气溶胶直接强迫气候的计算通常使用辐射传递参数，包括不对称参数g。获得粒子总体的不对称参数的一种方法是将半球与总散射比（反向散射比b）的测量值转换为其相应的g值。我们比较了从Mie计算得出的转换与从Henyey-Greenstein（HG）相函数得出的转换，以表明HG方法系统地高估了累积模式气溶胶典型尺寸分布的g。 δ-爱丁顿辐射传递计算用于表明，将g高估10％可将气溶胶导致的气候强迫降低12％或更多。 Mie计算用于得出对数正态累积模式气溶胶的后向散射比和不对称参数之间的经验关系。此关系可用于独立于几何平均直径D-gv或复数折射率m，将反向散射比转换为非对称参数，但是转换需要了解尺寸分布的宽度sigma（g）。 [参考：23]

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