SCIATRAN是一种高光谱分辨率辐射传输模型, 其参数丰富、调节性强, 为反演CO2浓度提供更可靠的仿真资料。研究采用SCIATRAN模型模拟了不同气溶胶类型、气溶胶光学厚度以及地表类型的CO2辐射亮度, 分析了不同条件下影响CO2辐射亮度的规律。研究结果表明: 气溶胶类型对CO2辐射亮度的影响比例在8%以内。由于城市型气溶胶成分复杂, 对CO2辐射亮度的影响比乡村型和海洋型气溶胶稍大; 气溶胶光学厚度对CO2辐射亮度的影响比例在-3.52%~42.97%之间, 光学厚度越小, CO2辐射亮度则越大; 地表类型对CO2辐射亮度影响最大, 与参考值差值比例最高达166.43%, 且CO2辐射亮度随地表反照率的增强而增强。该研究还通过仿真信号与实测信号的对比, 验证了SCIATRAN模型仿真信号的有效性和可行性。

SCIATRAN, providing more reliable simulation data for retrieval of CO2 concentration, is a high spectral resolution radiative transfer model with rich parameters and easily calibrated. In this article, SCIATRAN was used to simulate the CO2 radiation intensity of different aerosol types, aerosol optical thickness and surface types, and the regularity of influence of CO2 radiation intensity under different conditions was analyzed. The results show that: first the influence ratio of aerosol type on CO2 radiation intensity is less than 8%, because the urban aerosol has complex composition, the effect on CO2 radiation intensity is slightly larger than that of country type and ocean type aerosol; then, the influence of aerosol optical thickness on CO2 radiation intensity is -3.52%-+42.97%, and the smaller the optical thickness, the greater the radiation intensity; Last, the surface types have the greatest influence on the CO2 radiation intensity, and the difference between the result and the reference value is up to 166.43%. The CO2 radiation intensity increases when the surface albedo increases. This article also verifies the feasibility and effectiveness of the simulation signal based on SCIATRAN by comparing its analog signal to the measured signal.