摘要
利用T矩阵方法研究卷云中圆柱状粒子取向比对散射特性的影响,计算了在小尺度范围内圆柱状冰晶粒子的散射特征量如散射相函数、消光效率因子、不对称因子及单次散射反照率,并将计算结果与等表面积、等体积及等效体积与投影面积比三种情况下的球形粒子的相应值进行了对比。结果表明:体积与投影面积比等效最接近真实值;取向比对不同尺度柱状粒子散射特性的影响存在相似性且有必要加以考虑;此外,发现等表面积、不同取向比粒子的散射相函数有一交点。
The influence of the aspect ratio to the light-scattering properties of small size cylinder ice particles in cirrus cloud is studied by T-matrix method. The light-scattering characteristic quantities such as the phase function, extinction efficiency, asymmetrical parameter and single-scattering albedo are computed.The results are compared with those of the equivalent sphere with the equal surface-area, the equal volume and the equal volume-to-surface-area ratio. It is found that properties with respect to the same volume-to-surface-area ratio are mostly close to the reality. The influence of the aspect ratio on light scattering properties of cylinder particles with different size parameters has similarity and should be considered. In addition, there is a nodical point in the phase functions of cylinder particles with the same surface areas but different aspect ratios.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2009年第5期1155-1159,共5页
Acta Optica Sinica
基金
国家自然科学基金(40775028)
中国科学院知识创新工程青年人才领域专向前沿项目(073RC11127)资助课题
关键词
大气光学
散射特性
T矩阵
取向比
圆柱粒子
atmospheric optics scattering properties T-matrix aspect ratio cylinder particle
