基于Mie散射的卷云光学特性

基于中纬度卷云冰晶双峰、热带卷云冰晶三峰分布模型，利用Mie散射理论计算了1～13脚范围内中纬度及热带卷云的消光系数、散射系数、吸收系数。计算结果表明，由不同形状冰晶构成的热带卷云的相应光学参数比中纬度卷云的光学参数大些，但11支子弹玫瑰形状的相应参数要小一些；两种卷云在2．8～3．1μm，9．8～13μm范围内都存在两个基本相同的透射通带；在计算中纬度卷云的光学参数时，可以只考虑中空六棱柱与实心六棱柱中的一种，但计算热带卷云的光学参数时，实心六棱柱与空心六棱柱需要同时考虑。

Optical Properties of Cirrus Based on Mie Theory

Based on tri-modal size distribution parameterization for tropical cirrus and bio-model size distribution parameterization for middle latitude cirrus, absorption coefficient, scattering coefficient, extinction coefficient of both cirrus are computed by Mie theory for infrared wavelength during 1～13 μm. The results indicate that optical parameters of tropical cirrus composed of different ice crystal habits are larger than those of the middle latitude cirrus except bullet rosettes with even branches. When the wavelength of incident wave is 2.8～3.1 μm or 9.8～13 μm, both cirrus have similar transmission bands. Either hollow hexagonal column or solid hexagonal column could be chosen to calculate optical properties of the middle latitude cirrus, but when we calculate optical properties of the middle latitude cirrus, both of them should be taken into consideration.