内混合强吸收气溶胶粒子光散射的等效性
Equivalence of light scattering by strong absorbing aerosol particles in internal mixing state
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摘要: 以黑碳和水两种成分组成的内混合单分散气溶胶粒子为例，根据其各消光效率因子、吸收效率因子和散射相函数，分析了用等效折射率来描述含有不同成分的内混合气溶胶系统的适用性。结果表明：在瑞利散射区和几何光学区内，内核（碳粒）体积比为0.01,0.1,0.5,0.9时，消光效率在大多数尺度参数下等效性都很好，但在米散射区内相对较差；当体积比大于0.3时，其吸收效率、消光效率等效性较好；除瑞利散射区外，散射相函数在各体积比下的等效性都很差。当考虑内混合气溶胶粒子系统的散射和吸收特性时，一般不难找到等效折射率，但在光散射技术中，应用相函数反演等效折射率的可靠性还有待商榷。Abstract: For a monodispersion of water coated carbon particles in internal mixing state, the validity of equivalent refractive index for describing the internal mixture of aerosol particles with different complex refractive indexes is analyzed by their scattering efficiency and phase function. The equivalence of extinction efficiency is good in Rayleigh scattering’s range and geometrical optics’ range at different volume ratios of the carbon particle to the mixture, but the equivalence is not good in the range of Mie scattering. When the volume ratio of the strong absorbing material, carbon particle, is greater than 0.3, the equivalences of absorption efficiency and extinction efficiency are good. However, the equivalence of phase function is poor at different mixture ratios besides the range of
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Key words:
- atmospheric aerosol /
- light scattering /
- internal mixing /
- equivalent refractive index /
- equivalence
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