Atmospheric CO<sub>2</sub> column concentration retrieval based on high resolution laser heterodyne spectra and evaluation method of system measuring error

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Abstract

In this paper, a near-infrared laser heterodyne spectrometer developed by the laboratory is used to investigate the inversion of greenhouse gas column concentration and approximately evaluate the system measurement errors based on the optimal estimation algorithm. Firstly, the spectral database and the calculation results from the reference forward model are compared with the ground-based FTIR results, thereby selecting the detection window, the corresponding laser and detector. Secondly, the optimal estimation concentration inversion algorithm based on the reference forward model is established, and the Levenberg-Marquardt (LM) iterative method is adopted to realize the inversion of the concentration and vertical distribution profile of atmospheric CO ₂column in the whole layer, and the long-term observation comparative experiment is carried out to verify the feasibility of this algorithm. Finally, by simulating the selected detection window spectrum in different white noise, the approximate corresponding relationship between the system signal-noise-ratio (SNR) and CO ₂column concentration measuring error is eventually obtained. This research is an indispensable theoretical calculation part of the detection system and will conduce to improving the application of laser heterodyne technology in atmospheric observations.

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Corresponding author:Wang Gui-Shi,gswang@aiofm.ac.cn

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状态向量	先验值	定义
x(CO₂)	1	先验廓线的比例因子 (ECMWF) 45层.
a	a₀	基线中a₀、b₀和c₀的多项式系数由对预处理的LHR信号与模型结果(去除吸收部分后)的比值进行二阶多项式拟合得到.
b	b₀
c	c₀

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Vol. 69, Issue 14 - 2020-07-20

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