光学学报, 2013, 33 (11): 1101001, 网络出版: 2013-09-06   

一种非对称双成分气溶胶粒子模型的散射特性分析

Light Scattering Analysis of an Asymmetrical Two-Component Aerosol Particle Model
作者单位
1 中国科学院安徽光学精密机械研究所大气成分与光学重点实验室, 安徽 合肥 230031
2 中国科学院大学, 北京 100049
摘要
气溶胶单粒子的光学特性对于大气辐射过程的精确模拟至关重要。利用离散偶极子近似法,研究了一种硫酸盐包裹黑碳的非对称双成分气溶胶粒子模型在尺度参数为0.1~25时的光学特性,通过改变黑碳的位置分析了内部结构对内混合粒子光学特性的影响。黑碳位置对整个内混合体的消光、散射、后向散射效率因子、不对称因子、消光后向散射比和单次散射反照率有重要影响,在瑞利散射区影响较小,而在米氏散射区影响较大。黑碳位置仅对瑞利散射区的散射相函数和瑞利散射区中除了0°和180°附近之外散射角方向的影响较小。黑碳越小,其位置对内混合体的消光、散射和后向散射效率因子的影响越小。同一尺度参数下,黑碳离球心越近,内混合体单次散射反照率越小,而吸收效率因子则越大,存在明显的透镜效应。黑碳越小,透镜效应越明显;内混合体尺度参数越大,透镜效应也越明显。
Abstract
Orientation-averaged optical characteristics of single aerosol particles are needed for precise modeling of radiative processes in the Earth′s atmosphere. Optical properties of internal-mixed urban aerosols with the sulfate coated on black carbon are studied based on discrete dipole approximation for the size parameters from 0.1 to 25. Effects of the internal topology on particulate properties are also performed by changing the position of black carbon. Significant influences are observed for the extinction, scattering, backscattering efficiency factors, asymmetry parameters, extinction-to-backscattering ratios and single scattering albedos of the internal-mixed particles. These influences are relatively small for the size parameter less than 1 while those are large for size parameter more than 1. Meanwhile only the scattering phase function in Rayleigh scattering region and linear polarization in Rayleigh scattering region except the scattering angles near 0° and 180° are almost irrespective of the black carbon position. Smaller black carbon corresponds to weaker effects of black carbon positions on the extinction, scattering and backscattering efficiency factors. Shorter distance of black carbon from the boundary of mixtures with the same size parameter is accompanied by larger single scattering albedos and lower absorption efficiency factors associated with the lensing effect. Small black carbon or large size parameter has the more evident lensing effect related to internal-mixed particles with short distance of black carbon from the center of mixtures with the same size.

张小林, 黄印博, 饶瑞中. 一种非对称双成分气溶胶粒子模型的散射特性分析[J]. 光学学报, 2013, 33(11): 1101001. Zhang Xiaolin, Huang Yinbo, Rao Ruizhong. Light Scattering Analysis of an Asymmetrical Two-Component Aerosol Particle Model[J]. Acta Optica Sinica, 2013, 33(11): 1101001.

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