摘要
卷云一般分布在对流层上部到平流层下部,它主要由分布在大气高层的各种形状的冰晶粒子组成。冰晶粒子的散射特性在气候模式、辐射传输和遥感领域都具有非常重要的意义。利用Yang等计算的几种冰晶粒子的散射特性数据库,假定卷云粒子谱分布符合Γ分布,得到了卷云的平均单次散射特性,包括实心与中空六棱柱、六角平板、子弹花、聚合物以及星形枝状六种非球形冰晶粒子在短波0．2～5．0μm波段的消光效率因子、吸收效率因子、散射相函数等。展示了卷云短波散射性质随波长、卷云有效尺度和卷云中冰晶粒子形状的变化关系,并分析了其变化的可能原因。
Cirrus are commonly distributed between the top of troposphere and the below of stratosphere. They are mainly composed of non-spherical ice crystals with various shapes. Scattering properties of ice crystals are important to climatic model, radiative transfer, remote sensing and so on. The database of single-scattering properties for each of ice crystal particles was computed by Yang et al. In the database, six non-spherical ice crystal habits（hexagonal solid, hexagonal hollow column, hexagonal plate, aggregate, bullet rosette, dendrite）were considered. The mean single-scattering properties of cirrus in shorthwave region（0.2-5 μm） were obtained based on the database assuming Г distribution of ice crystal in the cirrus. These mean single-scattering properties include the extinction efficiency, absorption efficiency, phase function and so on. The spectral variations of the mean single-scattering properties were shown, as well as their dependence on the particle shapes and effective size, and the cause were discussed.
出处
《大气与环境光学学报》
CAS
2007年第3期169-174,共6页
Journal of Atmospheric and Environmental Optics
基金
中国科学院方向性创新项目(KGCX2-SW-413)
中国科学院合肥物质科学研究院院长基金
关键词
冰晶粒子
散射性质
卷云
短波
ice crystals
scattering properties
cirrus clouds
shortwave
