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通过建立地气系统的红外辐射传输方程,基于MODIS红外通道进行辐射传输计算。利用快速精确的透过率模型PFAAST计算大气透过率,在红外辐射传输计算中考虑了地面反射大气辐射亮度的影响,指出地面反射大气辐射亮度在整个方程所占比重随着地表发射率变小而增加,其中MODIS第33通道对发射率的改变最为敏感,美国标准大气下,当发射率ε=0.65时,比重达到7.12%,因此,忽略地面反射大气辐射亮度,直接影响红外辐射传输计算的准确性。模拟了MODIS各红外通道辐射亮度,并与MODTRAN4.0模拟结果比较,相对误差不超过0.12%,模拟了大气倾斜路径对卫星红外通道观测亮温的影响。
Through establishing the infrared radiation transmission equation of the geogas system, the radiation transmission calculation based on the MODIS infrared channel is carried out. The PFAAST method is used to calculate the atmospheric transmittance, and the effect of ground reflection atmospheric radiation brightness is considered in the calculation of infrared radiation transmission. It is pointed out that the proportion of ground reflection atmospheric radiation brightness in the entire equation decreases as the surface emissivity decreases The MODIS channel 33 is the most sensitive to the change of emissivity. Under the standard atmosphere in the United States, the emissivity of emissivity is 7.12% when the emissivity ε = 0.65. Therefore, neglecting the atmospheric radiation brightness of the surface reflection directly affects the calculation of the infrared radiation transmission accuracy. The radiance of each infrared channel of MODIS was simulated and the relative error was no more than 0.12% compared with that of MODTRAN4.0. The effect of atmospheric tilt path on the observed temperature of infrared satellite channel was simulated.