摘要
在冰晶粒子异质核化理论基础上,建立了椭球形、六角平板和六角棱柱3种簇团形核壳结构冰晶粒子模型,利用离散偶极子近似法(DDA)数值计算同一入射波长下,有效尺寸对核壳结构冰晶粒子消光效率、吸收效率和散射效率的影响、中间均匀混合层对核壳结构冰晶粒子散射强度的影响以及Mueller矩阵元素随散射角度的变化情况。数值结果表明:随着有效尺寸的增大,椭球形、六角平板和六角棱柱3种簇团形核壳结构冰晶粒子的消光效率、吸收效率和散射效率随着有效尺寸的增大分别呈现不同的变化趋势;在相等尺寸条件下,散射强度随散射角度的变化情况与粒子形状有密切关系,且相比于椭球形和六角平板两种簇团形核壳结构冰晶粒子,六角棱柱核壳结构冰晶粒子的前向散射强度最大,散射强度随散射角度的变化曲线振荡更明显。根据Mueller矩阵元素随散射角度的分布情况,可以看出六角棱柱簇团形冰晶结构的散射方向最明显,前向散射强度最大,六角平板和六角棱柱簇团形冰晶结构的Mueller矩阵元素相对球形和椭球形在后向散射场区域的偏差更明显。论文的研究结果为进一步分析复杂冰晶粒子的散射特性,开展高空云层中各种复杂几何形状簇团冰晶粒子的散射特性研究和分析提供支持。
On the basis of heterogeneous nucleation theory of ice crystal particles,three types of ice crystal particle models were established with nucleation-shell structures of ellipsoid,hexagonal flat plate and hexagonal prism.The extinction,absorption and scattering efficiency of these three special cluster-shaped core-shell structures were numerically calculated by discrete dipole approximation(DDA)method.Under the same incident wavelength,the effect of effective size on the extinction efficiency,absorption efficiency and scattering efficiency of core-shell ice crystal particles,the influence of the intermediate uniform mixing layer on the scattering intensity of core-shell ice crystal particles,and the variation of Mueller matrix elements with the scattering angle were calculated.The numerical results show that the extinction coefficient,absorption coefficient and scattering coefficient of ice crystallites with three clusters of ellipsoidal,hexagonal and hexagonal prisms show different trends with the increase of effective size.Under the condition of equal size,the scattering intensity with the change of the scattering angle and particle shape have close relations,and compared with the ellipsoid and hexagonal flat two cluster core-shell structure of ice crystal particles,core-shell structure of ice crystal particles hexagonal prisms forward scattering intensity,the largest scattering intensity curve along with the change of the scattering angle oscillation is more obvious.According to the distribution of the Mueller matrix elements with the scattering angle,it can be seen that the scattering direction of the hexagonal prism cluster ice crystal structure is the most obvious,and the forward scattering intensity is the largest.The Mueller matrix elements of the hexagonal plate and hexagonal prism cluster ice crystal structure are relatively spherical and the deviation of the ellipsoid in the backscattered field area is more obvious.The research results of the thesis provide support for further analysis of the scattering characteristics of complex ice crystal particles,and the research and analysis of the scattering characteristics of various complex geometric clusters of ice crystal particles in high-altitude clouds.
作者
任神河
高明
王明军
保秀娟
李艳
Ren Shenhe;Gao Ming;Wang Mingjun;Bao Xiujuan;Li Yan(School of Optoelectronic Engineering,Xi'an Technological University Xi’an 710021,China;School of Physics and Electronic Engineering,Xianyang Normal University,Xianyang 712000,Shaanxi,China;Institute of Automation and Information Engineering,Xi’an University of Technology,Xi’an 710048,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2020年第9期208-217,共10页
Infrared and Laser Engineering
基金
国家自然科学基金(61771385)
陕西省教育厅科学研究计划项目(18JK0833)
咸阳市重点研发计划(2019K02-21)。
关键词
冰晶粒子
离散偶极子近似方法
散射与吸收
ice crystal
discrete dipole approximation method
scattering and absorption
