| 光谱学与光谱分析 |
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| Measurements of the Concentration of Atmospheric CO2 Based on OP/FTIR Method and Infrared Reflecting Scanning Fourier Transform Spectrometry |
| WEI Ru-yi1, ZHOU Jin-song2, ZHANG Xue-min1,3, YU Tao1, 3, GAO Xiao-hui1, REN Xiao-qiang1 |
1. Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences; Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences, Xi’an 710119, China
2. Academy of Opto-Electronics of Chinese Academy of Sciences, Key Laboratory of Computational Optical Imaging Technology of Chinese Academy of Sciences, Beijing 100049, China
3. University of Chinese Academy of Sciences, Beijing 100190, China |
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Abstract 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 simulating-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 retrieved 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.
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Received: 2013-12-17
Accepted: 2014-03-19
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Corresponding Authors:
WEI Ru-yi
E-mail: ruyiwei@opt.ac.cn
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