卷云短波红外辐射特性
Infrared radiative properties of cirrus clouds in shortwave spectral region
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摘要: 采用离散纵标法耦合大气分子吸收，模拟计算了卷云大气的反射特性。研究了在短波波段卷云辐射性质随波长、卷云光学厚度、卷云有效尺度、云高和卷云中冰晶粒子形状等的变化关系，分析了卷云对大气红外背景辐射的影响。结果表明：在2.7 μm的水汽强吸收带上，卷云的出现明显增强了该波段的大气背景辐射，反射率随光学厚度和云高增大而增大。Abstract: DISORT method was employed to study radiative properties of cirrus clouds in the shortwave infrared spectral region. The properties were shown, as well as their dependence on wavelength, visible optical thickness of cirrus clouds, cloud altitude, the particle shapes and effective size of cirrus clouds, and so on. The influences of cirrus clouds on atmospheric infrared background radiation were analysed. The main result is that at 2.7 μm atmospheric absorption region, the atmosphere background radiance is very weak, but when cirrus clouds appear in the sky, they reflect solar energy, thus the atmosphere background radiance is greatly enhanced.
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Key words:
- atmospheric and ocean optics /
- reflectance /
- disort method /
- cirrus clouds /
- radiative properties
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