Open AccessDevelopment of a laser heterodyne spectroradiometer for high-resolution measurements of CO2, CH4, H2O and O2 in the atmospheric column
Author(s) -
Hao Deng,
Chenguang Yang,
Zhenyu Xu,
Mingxing Li,
An-Bin Huang,
Yuexiang Lu,
Mai Hu,
Bing Chen,
Yabai He,
Ruifeng Kan,
Jianguo Liu
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.413035
Subject(s) - water vapor , optics , laser , radiometer , analytical chemistry (journal) , spectral resolution , mole fraction , materials science , physics , spectral line , meteorology , chemistry , chromatography , astronomy , thermodynamics
We have developed a portable near-infrared laser heterodyne radiometer (LHR) for quasi-simultaneous measurements of atmospheric carbon dioxide (CO 2 ), methane (CH 4 ), water vapor (H 2 O) and oxygen (O 2 ) column absorption by using three distributed-feedback diode lasers as the local oscillators of the heterodyne detection. The developed system shows good performance in terms of its high spectral resolution of 0.066 cm -1 and a low solar power detection noise which was about 2 times the theoretical quantum limit. Its measurement precision of the column-averaged mole fraction for CO 2 and CH 4 is within 1.1%, based on the standard deviation from the mean value of the retrieved results for a clean sky. The column abundance information of the O 2 is used to correct for the variations and uncertainties of atmosphere pressure, the solar altitude angle, and the prior profiles of pressure and temperature. Comparison measurements of daily column-averaged atmospheric mole fractions of CO 2 , CH 4 and H 2 O, between our developed LHR and a greenhouse gas observing satellite, show a good agreement, which proves the reliability of our developed system.