Wavelength Misalignment in the Retrieval of Atmospheric Trace Gases Concentration

Journal of Atmospheric and Environmental Optics ›› 2010, Vol. 5 ›› Issue (1): 40-45.

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Wavelength Misalignment in the Retrieval of Atmospheric Trace Gases Concentration

FANG Fang, HU Zhen-hua, GU Xue-jun, FANG Li

( Laboratory of Environmental Spectroscopy, Center of Environmental Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, HeFei 230031, China )

Received:2009-04-28 Revised:2009-06-12 Online:2010-01-28 Published:2010-01-26

Abstract

Abstract:

In the retrieval of atmospheric trace-gas concentrations, it’s a widely used method to fit the calculated reference spectra to the measured spectra with least-squares methods. However, because of inaccuracy of the grating position, thermal changes in the spectrometer, and the resolution difference between the two spectra; there is a spectral misalignment between the measured spectra and the reference spectra: the measured spectra may be shifted or stretched/squeezed. These misalignments will affect the accuracy of the retrieval. An algorithm doing the shift-and-squeeze spectral correction in the process of the retrieval is introduced and the concentration error caused by spectral shift under different resolutions is calculated.

Key words: spectrum adjustment, wavelength misalignment, least-squares method

CLC Number:

O433.3

FANG Fang, HU Zhen-Hua, GU Xue-Jun, FANG Li. Wavelength Misalignment in the Retrieval of Atmospheric Trace Gases Concentration[J]. Journal of Atmospheric and Environmental Optics, 2010, 5(1): 40-45.

Wavelength Misalignment in the Retrieval of Atmospheric Trace Gases Concentration

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