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Atmospheric trace gas inversion method based on improved optimal estimation

A trace gas and optimal estimation technology, applied in the direction of specific mathematical models, calculations, calculation models, etc., can solve problems such as the inability of the algorithm to converge globally, and achieve the effect of solving the problem of the inability of the algorithm to converge globally and improving the modeling accuracy

Active Publication Date: 2021-08-10
BEIHANG UNIV
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Problems solved by technology

[0005]The purpose of the present invention is to solve the problem that the algorithm cannot converge globally when the difference between the prior atmospheric information and the actual value is large in the atmospheric trace gas inversion work, and to provide a Atmospheric trace gas retrieval method based on improved optimal estimation

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  • Atmospheric trace gas inversion method based on improved optimal estimation
  • Atmospheric trace gas inversion method based on improved optimal estimation
  • Atmospheric trace gas inversion method based on improved optimal estimation

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Embodiment Construction

[0060] In order to better illustrate the atmospheric trace gas inversion method involved in the present invention, the atmospheric trace gas inversion is carried out using the near-infrared solar spectrum data recorded by the ground-based Fourier transform infrared spectrometer. The present invention is an atmospheric trace gas inversion method based on improved optimal estimation, and the specific implementation steps are as follows:

[0061] (1) Read in the ground-based solar measurement spectral data, input the prior profile and gas absorption line information: read in the ground-based infrared direct solar measurement spectrum recorded by the Helios-100 spectrometer to be inverted, and the spectral range is 4000-13500cm -1 , Spectral resolution is 0.5cm -1 ; Input the prior temperature and humidity pressure profile from NCEP and the gas volume mixing ratio prior profile from WACCM historical monthly average data, and extract the relevant gas absorption line information in ...

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Abstract

The invention relates to an atmospheric trace gas inversion method based on improved optimal estimation, and the method comprises the following steps: (1) reading foundation solar measurement spectral data, and inputting prior profile and gas absorption line information; (2) calculating the atmospheric transmittance based on a line-by-line integral radiation transmission forward model by using the prior profile and absorption line information; (3) based on the Lambert-Beer law, calculating the atmospheric transmittance obtained in the step (2) to obtain a simulated spectrum; (4) on the basis of an optimal estimation algorithm, constructing a target function to describe the closeness degree of the simulated spectrum and the measured spectrum; (5) calculating the next iteration point based on the Levenberg-Marquardt method, and iteratively solving the minimum value of the objective function; (6) judging whether iteration is terminated or not, and obtaining the total amount of trace gas columns and a vertical profile when a termination condition is met. According to the method, convergence can be ensured and trace gas distribution of a local area can be obtained when a prior profile is difficult to accurately obtain, and the iteration efficiency and stability of an optimal estimation algorithm are improved.

Description

technical field [0001] The invention relates to an atmospheric trace gas inversion method based on improved optimal estimation, belongs to the field of atmospheric composition monitoring methods and application technology, and is suitable for research on spectrum-based gas inversion methods and application technologies. Background technique [0002] In spectroscopic trace gas detection technology, compared with in-situ measurement and satellite measurement methods, ground-based Fourier transform infrared spectroscopy technology can simultaneously invert the vertical profiles and column totals of various trace gases, which has the advantages of Higher accuracy, at the same time, it can be used for fixed-point atmospheric trace gases because it is less affected by changes in the local atmospheric state of the surface compared with in-situ measurements and has higher measurement accuracy of near-surface trace gases than satellite observations The detection of concentration chan...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06N7/00G06F17/16G06F17/18G01N21/359G01N21/3504G06F111/08
CPCG06F30/20G06F17/16G06F17/18G01N21/359G01N21/3504G06F2111/08G06N7/01
Inventor 李娜赵慧洁沈琳徐萌
Owner BEIHANG UNIV
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