Acta Optica Sinica, Volume. 41, Issue 11, 1101003(2021)
Analysis of Mid-Infrared Spectroscopy and Research on Retrieval Conditions of 13CO2
In this paper, we analyzed the characteristics of the mid-infrared spectra containing the 13CO2 strong absorption with a transmission model of scanning imaging absorption (SCIATRAN) and a high-resolution transmission molecular absorption database (HITRAN). We found that the 13CO2 absorption was more obvious in the mid-infrared band than in the near-infrared and thermal infrared bands; the mid-infrared band was extremely sensitive to changes in the CO2 concentration in the 5--15 km middle and upper troposphere. Atmospheric convection and exchange make the change in the CO2 concentration in the middle and upper layers closely related to the near-surface. The analysis of the spectral characteristics indicates that the main factors affecting CO2 retrieval are water vapor, temperature, and nitrous oxide. Furthermore, we retrieved the 13CO2 concentration with satellite remote sensing data and provided the necessary conditions for retrieval. Specifically, the profiles of water vapor, temperature, and nitrous oxide should respectively have the precision of 50×10 -6, above 0.03 K, and above 5×10 -9; the signal-to-noise ratio of the instruments needs to be higher than 600. Our findings provide a theoretical basis for 13CO2 detection with satellite remote sensing and put forward requirements for indicators for future hyperspectral detector manufacturing. As such, we can better control the CO2 source, sink, and transmission laws and grasp the global carbon cycle budget.
Get Citation
Copy Citation Text
Shichao Wu, Xianhua Wang, Hanhan Ye, Chao Li, Yuan An, Xiaodi Wang. Analysis of Mid-Infrared Spectroscopy and Research on Retrieval Conditions of 13CO2[J]. Acta Optica Sinica, 2021, 41(11): 1101003
Category: Atmospheric Optics and Oceanic Optics
Received: Dec. 7, 2020
Accepted: Jan. 13, 2021
Published Online: Jun. 7, 2021
The Author Email: Wang Xianhua (xhwang@aiofm.ac.cn)