Small and large particle limits of single scattering albedo for homogeneous, spherical particles
Small and large particle limits of single scattering albedo for homogeneous, spherical particles
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DOI：
10.1016/j.jqsrt.2017.09.029
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发表时间：
2018-01-01
影响因子：
2.3
通讯作者：
Sorensen, C. M.
中科院分区：
文献类型：
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作者：
Moosmuller, H.;Sorensen, C. M.
气溶胶单散射反照率（SSA）是决定气溶胶直接辐射强迫的主要密集粒子参数。对于均匀球形颗粒和与波长无关的复折射率，SSA 仅取决于颗粒的尺寸参数（颗粒周长与波长之比）和复折射率。在这里，我们探索了小颗粒和大颗粒极限的这种依赖性，其尺寸参数远小于和大于 1。我们表明，在瑞利散射的小颗粒极限中，可以引入一种新颖的广义尺寸参数，该参数统一了 SSA 对颗粒尺寸参数的依赖性，与复折射率无关。在大颗粒极限下，SSA 随着折射率虚部与尺寸参数（另一个广义参数）乘积的增加而减小，直到该乘积变为大约 1，然后保持相当恒定，直到折射率的虚部变得与实部减一相当。超过这一点，颗粒开始获得金属特性，SSA 随着折射率的虚部迅速增加并接近 1。 (C) 2017 年作者。由爱思唯尔有限公司出版
The aerosol single scattering albedo (SSA) is the dominant intensive particle parameter determining aerosols direct radiative forcing. For homogeneous spherical particles and a complex refractive index independent of wavelength, the SSA is solely dependent on size parameter (ratio of particle circumference and wavelength) and complex refractive index of the particle. Here, we explore this dependency for the small and large particle limits with size parameters much smaller and much larger than one.We show that in the small particle limit of Rayleigh scattering, a novel, generalized size parameter can be introduced that unifies the SSA dependence on particle size parameter independent of complex refractive index. In the large particle limit, SSA decreases with increasing product of imaginary part of the refractive index and size parameter, another generalized parameter, until this product becomes about one, then stays fairly constant until the imaginary part of the refractive index becomes comparable with the real part minus one. Beyond this point, particles start to acquire metallic character and SSA quickly increases with the imaginary part of the refractive index and approaches one. (C) 2017 The Authors. Published by Elsevier Ltd.