Ground-based remote sensing of atmospheric total column CO2 and CH4 by direct sunlight in Hefei

doi:10.1088/1674-1056/22/12/129201

中国物理B ›› 2013, Vol. 22 ›› Issue (12): 129201-129201.doi: 10.1088/1674-1056/22/12/129201

• GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS • 上一篇下一篇

Ground-based remote sensing of atmospheric total column CO₂ and CH₄ by direct sunlight in Hefei

程巳阳, 徐亮, 高闽光, 李胜, 金岭, 童晶晶, 魏秀丽, 刘建国, 刘文清

Key Laboratory of Environment Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China

收稿日期:2013-03-20 修回日期:2013-05-15 出版日期:2013-10-25 发布日期:2013-10-25
基金资助:
Project supported by the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (Grant No. 2012BAJ24B02) and the National Natural Science Foundation of China (Grant Nos. 40905011 and 41105022).

Ground-based remote sensing of atmospheric total column CO₂ and CH₄ by direct sunlight in Hefei

Cheng Si-Yang (程巳阳), Xu Liang (徐亮), Gao Min-Guang (高闽光), Li Sheng (李胜), Jin Ling (金岭), Tong Jing-Jing (童晶晶), Wei Xiu-Li (魏秀丽), Liu Jian-Guo (刘建国), Liu Wen-Qing (刘文清)

Key Laboratory of Environment Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China

Received:2013-03-20 Revised:2013-05-15 Online:2013-10-25 Published:2013-10-25
Contact: Xu Liang E-mail:xuliang@aiofm.ac.cn
Supported by:
Project supported by the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (Grant No. 2012BAJ24B02) and the National Natural Science Foundation of China (Grant Nos. 40905011 and 41105022).

摘要/Abstract

摘要： Fourier transform spectrometry has played an important role in the three-dimensional greenhouse gas monitoring as the focus of attention on global warming in the past few years. In this paper, a ground-based low-resolution remote sensing system measuring the total columns of CO₂ and CH₄ is developed, which tracks the sun automatically and records the spectra in real-time and has the advantages of portability and low cost. A spectral inversion algorithm based on nonlinear least squares spectral fitting procedure for determining the column concentrations of these species is described. Atmospheric transmittance spectra are computed line-by-line in the forward model and observed on-line by direct solar radiation. Also, the wavelength shifts are introduced and the influence of spectral resolution is discussed. Based on this system and algorithm, the vertical columns of O₂, CO₂, and CH₄ are calculated from total atmospheric observation transmittance spectra in Hefei, and the results show that the column averaged dry-air mole fractions of CO₂ and CH₄ are measured with accuracies of 3.7% and 5%, respectively. Finally, the H₂O columns are compared with the results observed by solar radiometer at the same site and the calculated correlation coefficient is 0.92, which proves that this system is suitable for field campaigns and used to monitor the local greenhouse gas sources under the condition of higher accuracy, indirectly.

关键词: carbon dioxide, methane, ground-based remote sensing, solar absorption spectroscopy

Abstract: Fourier transform spectrometry has played an important role in the three-dimensional greenhouse gas monitoring as the focus of attention on global warming in the past few years. In this paper, a ground-based low-resolution remote sensing system measuring the total columns of CO₂ and CH₄ is developed, which tracks the sun automatically and records the spectra in real-time and has the advantages of portability and low cost. A spectral inversion algorithm based on nonlinear least squares spectral fitting procedure for determining the column concentrations of these species is described. Atmospheric transmittance spectra are computed line-by-line in the forward model and observed on-line by direct solar radiation. Also, the wavelength shifts are introduced and the influence of spectral resolution is discussed. Based on this system and algorithm, the vertical columns of O₂, CO₂, and CH₄ are calculated from total atmospheric observation transmittance spectra in Hefei, and the results show that the column averaged dry-air mole fractions of CO₂ and CH₄ are measured with accuracies of 3.7% and 5%, respectively. Finally, the H₂O columns are compared with the results observed by solar radiometer at the same site and the calculated correlation coefficient is 0.92, which proves that this system is suitable for field campaigns and used to monitor the local greenhouse gas sources under the condition of higher accuracy, indirectly.

Key words: carbon dioxide, methane, ground-based remote sensing, solar absorption spectroscopy

中图分类号: (Greenhouse gases)

92.30.Np

42.68.Wt (Remote sensing; LIDAR and adaptive systems) 42.68.Ca (Spectral absorption by atmospheric gases)

程巳阳, 徐亮, 高闽光, 李胜, 金岭, 童晶晶, 魏秀丽, 刘建国, 刘文清. Ground-based remote sensing of atmospheric total column CO₂ and CH₄ by direct sunlight in Hefei[J]. 中国物理B, 2013, 22(12): 129201-129201.

Cheng Si-Yang (程巳阳), Xu Liang (徐亮), Gao Min-Guang (高闽光), Li Sheng (李胜), Jin Ling (金岭), Tong Jing-Jing (童晶晶), Wei Xiu-Li (魏秀丽), Liu Jian-Guo (刘建国), Liu Wen-Qing (刘文清). Ground-based remote sensing of atmospheric total column CO₂ and CH₄ by direct sunlight in Hefei[J]. Chin. Phys. B, 2013, 22(12): 129201-129201.

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Ground-based remote sensing of atmospheric total column CO₂ and CH₄ by direct sunlight in Hefei

Ground-based remote sensing of atmospheric total column CO₂ and CH₄ by direct sunlight in Hefei

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