复合气溶胶粒子光学特性的数值计算  

Numerical calculation of the optical properties for compound aerosol particles

作　　者：黄朝军[1,2] 吴振森[1] 刘亚锋[2] 

机构地区：[1]西安电子科技大学理学院,西安710071 [2]陕西理工学院物理与电信工程学院,汉中723000

出　　处：《原子与分子物理学报》2012年第6期1077-1081,共5页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(41105107);陕西省自然科学基金(2010JM5011);陕西省教育厅专项科研计划项目(11JK0727)

摘　　要：大气气溶胶是地—气系统中的重要组成部分.气溶胶的光学参量是评估大气环境、研究气溶胶辐射气候效应的重要影响因子,也是研究大气激光传输特性的重要参量.根据物质的电结构,将复合气溶胶粒子离散为一系列偶极子,结合离散偶极子近似方法,在获得每一个偶极子的电偶极矩之后,数值计算了球形、椭球形以及层状复合气溶胶粒子的消光截面、吸收截面和不对称因子等光学参量随波长变化的数值结果,并对比分析了椭球形状单一和复合气溶胶粒子光学参量的值.结果显示,入射光波长、气溶胶粒子的形状以及气溶胶粒子的成分都将影响气溶胶粒子的光学特性.研究结果可为大气光学、气溶胶气候辐射强迫效应、大气激光传输等与气溶胶粒子相关领域提供一种有效的研究方法和基础.The atmosphere aerosol is an important part in earth and atmosphere system. The optical parameters are the important influence factors for evaluating atmospheric environment and studying the aerosol radiation climatic effect. They are also the key parameters for the research on the characteristics of laser propagation in atmosphere. According to the electrical structure of matter, the compound aerosol particles are dispersed into a series of dipoles, then by combining with discrete dipole approximation method and after obtaining the electric dipole moment of each dipole, the authors get the numerical results of the changes of extinction cross section, absorption cross section and asymmetry factor of spherical shape, ellipsoid shape and stratiform compound aerosol particles with wavelength, and made a comparative analysis of the optical parameter values for the ellipsoidal shape of single and composite components aerosol particles. The results show that all the incident wavelength, shape and component of aerosol particles can affect the optical properties of aerosol particles. These can provides an efficiency approach and foundation for the research of the atmospheric optics, the aerosol climate radiative forcing effect, laser atmospheric transmission, etc.

关 键 词：复合气溶胶粒子 光学特性 数值计算 

分 类 号：O434.14[机械工程—光学工程]