Remote sensing of CH4 column concentration in the atmosphere based on direct sun infrared absorption spectroscopy

Abstract

Abstract: A remote sensing system was developed based on direct-sun infrared absorption spectroscopy in order to study the detection method of Methane column concentration, which was running continuously in Hefei. The total atmospheric transmittance was real-timely measured from the solar absorption spectrum and modeled by line-by-line calculation. The column concentrations of Methane and oxygen were inversed from measured total atmospheric transmittance by nonlinear least squares spectral inversion algorithm. The column concentration of oxygen was used as internal standard function to obtain column-average dry-air mole fractions of Methane and the precision was better than 2%. The column-average dry-air mole fractions of Methane, from 12:00 to 15:00 on September 25, 2012, were compared with Methane results observed by Japanese greenhouse-gases satellite over this site at this period, showing that the relative deviation was less than 1%. Obviously, this system and algorithm are an effective way to detect Methane column concentration with higher precision.

Key words: atmospheric optics, methane, column concentration, remote sensing, infrared absorption spectroscopy

CLC Number:

O433.4

CHENG Si-yang, GAO Min-guang, XU Liang, JIN Ling, LI Sheng, Tong Jing-jing, LIU Jian-guo, LIU Wen-qing. Remote sensing of CH4 column concentration in the atmosphere based on direct sun infrared absorption spectroscopy[J]. J4, 2014, 31(1): 18-24.

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