Irregularly shaped ice aggregates in optical modeling of convectively generated ice clouds

被引:61
作者
Ishimoto, Hiroshi [1 ]
Masuda, Kazuhiko [1 ]
Mano, Yuzo [1 ]
Orikasa, Narihiro [1 ]
Uchiyama, Akihiro [1 ]
机构
[1] Meteorol Res Inst, Tsukuba, Ibaraki 3050052, Japan
关键词
Light scattering; Irregularly shaped particles; Cirrus; SINGLE-SCATTERING PROPERTIES; LIGHT-SCATTERING; RADIATIVE-TRANSFER; GEOMETRIC-OPTICS; CIRRUS CLOUDS; CRYSTALS;
D O I
10.1016/j.jqsrt.2012.01.017
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We propose a model of irregular shaped ice particles for satellite and ground-based cloud remote sensing applications. Microphysical observations have shown that ice particles generated in convective clouds tend to have highly irregular structures as a result of aggregation process. To simulate such complex structures, we used spatial Poisson-Voronoi tessellations. Furthermore, we adopted fractal-like shapes that were consistent with the proposed mass-dimension and area ratio-dimension relationships of measured cirrus particles. Single-scattering properties of the modeled "Voronoi aggregates" at visible wavelengths with size parameters up to 2246 were estimated from numerical calculations using the finite-difference time-domain method and the geometrical-optics integral-equation method. The phase functions for randomly oriented Voronoi aggregates showed features with no halos in the forward-scattering direction and a flat angular dependence in the side-to-backscattering directions. These characteristics and resultant asymmetry factors agreed with those of measured ice particles. Moreover, we confirmed the weak size and shape dependences of these scattering properties for the Voronoi aggregates, as well as high backscattering depolarization ratios and low linear polarizations. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:632 / 643
页数:12
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