地球临边大气红外辐射中太阳散射数值研究

The Numerical Study of Solar Scattering on Limb Atmospheric Infrared Radiation

为分析太阳散射辐射在地球临边大气红外辐射中的作用,基于地球与临边大气辐射传输与太阳散射模型,利用MODTRAN计算了中纬度冬夏两季在3~14μm红外波段的大气各组成辐射。针对3~5μm和8~14μm波段,计算了在不同的太阳角度下各大气模式下太阳散射辐射值及其所占总辐射的比例。结果表明在20°左右太阳角度下太阳散射辐射最强,且纬度越高、温度越低太阳散射辐射越强。在短红外波段太阳散射辐射为中长波段的30倍,短红外波段太阳散射辐射所占总辐射比例较高,最高可达80%,在中长波段比例低于0.1%,可忽略不计。

For analysis of scattering solar radiation influence on limb atmospheric infrared radiation,based on the scattering model,with the sun on atmospheric radiative transfer limb was calculated by using MODTRAN mid-latitude winter and summer in 3 ~ 14 μm infrared radiation of atmospheric components.For 3 ~ 5 μm and 8 ~ 14 μm band,was calculated under different Angle of the sun＇s atmosphere mode scattering solar radiation values and accounts for the proportion of the total radiation atmosphere.Results show that the sun angles around 20° scattering radiation is strongest,and the higher the latitude,the lower the temperature the more scattering solar radiation.In a short infrared band scattering solar radiation for a long band of 30 times,shorter infrared wavelengths scattering solar radiation,the proportion of atmospheric radiation is higher,up to 80%,in the long wave band ratio less than 0.1%,can be ignored.