沙尘气溶胶粒子多波长退偏振特性仿真研究  

Simulation of multi-wavelength depolarization characteristics of dust aerosol particles

作　　者：王颖 刘东[1] WANG Ying;LIU Dong(Key Laboratory of Atmospheric Optics,Anhui Institute of Optic and Fine Mechanics,HFIPS,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院合肥物质科学研究院安徽光学精密机械研究所,中国科学院大气光学重点实验室,安徽合肥230031 [2]中国科学技术大学,安徽合肥230026

出　　处：《大气与环境光学学报》2023年第5期458-468,共11页Journal of Atmospheric and Environmental Optics

基　　金："一带一路"国际科学组织联盟联合研究合作专项资助(ANSO-CR-KP-2020-09);中国科学院国际合作局对外合作重点项目资助(116134KYSB20180114)。

摘　　要：采用OPAC(Optical Properties of Aerosols and Clouds)模型提供的沙尘粒子谱分布和复折射率参数,结合多个入射波长,对群体沙尘气溶胶粒子的退偏振比进行了数值模拟计算。计算获得1064 nm、532 nm和355 nm入射波长下,不同轴比超椭球模型的沙尘气溶胶粒子群体的退偏振比分别为0.317,0.397和0.446,其中1064 nm波长的仿真结果与实际观测结果一致性最好,其次是532 nm波长的仿真结果,355 nm波长的仿真结果和实际观测结果有较大差异,其可能原因为采用了相同数目偶极子导致计算误差增大。本仿真研究中建立的非球形粒子散射模型和数值计算方法,为深入理解沙尘气溶胶光散射特性和研制多波长偏振激光雷达提供了理论基础。同时,多波长偏振探测也为气溶胶混合态和污染型气溶胶生成机理研究提供了重要的技术手段。The simulation of light scattering characteristics of dust aerosol particles is mainly affected by shape models.Based on the size distribution information of dust aerosol particles provided by the Optical Properties of Aerosols and Clouds(OPAC)package,the light scattering characteristics of group dust aerosol particles are numerically simulated to study their wavelength dependency.Three incident wavelengths of 1064 nm,532 nm and 355 nm are used for calculating the depolarization ratios of different super-ellipsoid dust particles,and the simulation results show the depolarization ratios of 0.317,0.397 and 0.446 for each wavelength respectively.Compared with the lidar measurements,the simulation depolarization ratio at 1064 nm wavelength shows the highest consistence,followed by the simulation results at 532 nm wavelength.However,the simulation depolarization ratio at 355 nm wavelength has large bias with the lidar measurements,which may be caused by the same number of the dipoles used for all wavelengths and needs to be investigated in the future.The methodology and non-spherical models used in this study will greatly contribute to our deeper understandings on the wavelength dependence of the depolarization properties of the dust aerosol and guide the development of multi-wavelength polarization lidar.In addition,multi-wavelength polarization measurements will also provide a unique technique to study the mixing state and the evolution of the pollution aerosols.

关 键 词：非球形粒子 超椭球模型 沙尘气溶胶 多波长 退偏振比 

分 类 号：X513[环境科学与工程—环境工程]