中文摘要：

对地球大气温室气体进行高精度的探测,是当今数值天气预报和气候与大气环境变化监测的发展需求。利用OP/FTIR测量法,将一台国内率先自行研制的中波红外反射转镜式干涉光谱仪,首次成功地用于地表大气CO2红外吸收光谱的测量。该反射转镜式干涉光谱仪的工作谱段为2 100~3 150cm-1,光谱分辨率为2cm-1。设计了大气成分探测方法,建立了大气浓度参数反演数理依据和定量分析算法。采用基于比尔定律的直接法和基于HITRAN数据库及仪器函数的仿真拟合法,建立了反演模型,并对CO2分子的浓度进行了反演。根据观测和模型分析,CO2的浓度反演结果在300~370ppm,呈现出随自然环境变化先缓慢降低再快速升高的趋势,并在下午至傍晚之间达到低值;同时,随时间的变化,用直接法计算的CO2浓度和用拟合法的仿真值表现出了良好的一致性,所有测量数据之间的相关性高达99.79%,相对误差不超过2.00%,达到了较高的反演精度。结果表明,在遥感测量大气成分方面,基于红外反射转镜式干涉光谱仪的OP/FTIR法是可行且有效的技术手段,直接法或拟合法皆可实现高精度的浓度反演。

英文摘要：

The present paper describes the observations and measurements of the infrared absorption spectra of CO2 on the Earth’s surface with OP/FTIR method by employing a mid-infrared reflecting scanning Fourier transform spectrometry ,which are the first results produced by the first prototype in China developed by the team of authors .This reflecting scanning Fourier transform spectrometry works in the spectral range 2 100~3 150 cm -1 with a spectral resolution of 2 cm -1 .Method to measure the atmospheric molecules was described and mathematical proof and quantitative algorithms to retrieve molecular concentration were established .The related models were performed both by a direct method based on the Beer-Lambert Law and by a simula-ting-fitting method based on HITRAN database and the instrument functions .Concentrations of CO2 were retrieved by the two models .The results of observation and modeling analyses indicate that the concentrations have a distribution of 300~370 ppm , and show tendency that going with the variation of the environment they first decrease slowly and then increase rapidly during the observation period ,and reached low points in the afternoon and during the sunset .The concentrations with measuring times re-trieved by the direct method and by the simulating-fitting method agree with each other very well ,with the correlation of all the data is up to 99.79% ,and the relative error is no more than 2.00% .The precision for retrieving is relatively high .The results of this paper demonstrate that ,in the field of detecting atmospheric compositions ,OP/FTIR method performed by the Infrared reflecting scanning Fourier transform spectrometry is a feasible and effective technical approach ,and either the direct method or the simulating-fitting method is capable of retrieving concentrations with high precision .