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依据红外分光计(InfraRed At mospheric Sounder,IRAS)光谱通道特征,发展了基于IRAS的大气辐射传输计算模式。以大气分子吸收光谱数据集(HIgh resolution TRANsmission,HITRAN)2004为初始谱线输入资料,利用该模式模拟计算IRAS在CO2吸收带的10个通道辐射率测值对CO2浓度变化的响应,并对比了其与大气温度和水汽、O3等气体浓度误差对辐射率测值的影响,探讨了利用风云三号气象卫星探测大气CO2浓度的可行性。结果表明,IRAS的通道4最适于用来监测大气CO2浓度的变化,当CO2体积混合比浓度变化在10×10-6时,对应的辐射率变化同仪器等效噪声辐射率相当,所以IRAS在理想状态下,最高可分辨的大气CO2浓度变化约为10×10-6。
Based on IRAS spectral channel characteristics, an IRAS-based calculation mode of atmospheric radiative transfer is developed. HITRAN 2004 was used as the input data for the initial spectral line. The model was used to simulate the response of IRAS in 10 channels of CO2 absorption band to the change of CO2 concentration, and compared with that of IRAS The influence of atmospheric temperature, water vapor and O3 gas concentration on the emissivity measurements was discussed. The feasibility of detecting atmospheric CO2 concentration using the Fengyun III meteorological satellite was discussed. The results showed that channel 4 of IRAS was the most suitable for monitoring the change of atmospheric CO2 concentration. When the concentration of CO2 mixed volume was changed to 10 × 10-6, the corresponding change of emissivity was equivalent to the equivalent noise emissivity of the instrument. Therefore, IRAS Ideally, the maximum resolvable atmospheric CO2 concentration varies by about 10 × 10-6.