光学学报, 2009, 29 (5): 1155, 网络出版: 2009-05-22
取向比对圆柱状冰晶粒子光散射特性的影响
The Influence of the Aspect Ratio to the Light Scattering Properties of Cylinder Ice Particles
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
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\.
Abstract
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.
宫纯文, 魏合理, 李学彬, 邵士勇, 徐青山, 陈秀红. 取向比对圆柱状冰晶粒子光散射特性的影响[J]. 光学学报, 2009, 29(5): 1155. Gong Chunwen, Wei Heli, Li Xuebin, Shao Shiyong, Xu Qingshan, Chen Xiuhong. The Influence of the Aspect Ratio to the Light Scattering Properties of Cylinder Ice Particles[J]. Acta Optica Sinica, 2009, 29(5): 1155.