量子电子学报, 2014, 31 (1): 18, 网络出版: 2014-02-26
基于直射太阳光红外吸收光谱技术的大气中CH4柱浓度遥测研究
Remote sensing of CH4 column concentration in atmosphere based on direct-sun infrared absorption spectroscopy
大气光学 甲烷 柱浓度 遥测 红外吸收光谱技术 atmospheric optics methane column concentration remote sensing infrared absorption spectroscopy
摘要
介绍了一种基于直射太阳光红外吸收光谱技术的遥测系统, 并利用该系统在合肥地区进行了连续观测。从太阳吸收光谱中测量了整层大气透过率,采用逐线积分 方法模拟计算了整层大气透过率,基于非线性最小二乘光谱反演算法从实测整层大气透过率中反演了甲烷 气体柱浓度和氧气柱浓度,并以氧气柱浓度为内标函数获得了甲烷干空气柱体积混合比,精密度优于2%。 将本系统测量的2012年9月25日12:00~15:00 CH4 干空气柱体积混合比均值与此时段过境本站点区域的日本温 室气体卫星的CH4 观测结果进行了比较,两者偏差小于1%。可见,该系统和方法是一种有效的甲烷气体柱浓 度探测系统和方法,具有较高精度。
Abstract
A remote sensing system was developed based on direct-sun infrared absorption spectroscopy, which was running continuously in Hefei, Anhui. The total atmospheric transmittance was 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 during the same 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.
程巳阳, 高闽光, 徐亮, 金岭, 李胜, 童晶晶, 刘建国, 刘文清. 基于直射太阳光红外吸收光谱技术的大气中CH4柱浓度遥测研究[J]. 量子电子学报, 2014, 31(1): 18. 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 atmosphere based on direct-sun infrared absorption spectroscopy[J]. Chinese Journal of Quantum Electronics, 2014, 31(1): 18.