An extended intercomparison of simultaneous ground-based Fourier transform infrared spectrometer measurements at the Toronto Atmospheric Observatory

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• 作者：Jeffrey R. Taylor ; Debra Wunch ; Clive Midwinter ; Aldona Wiacek ; James R. Drummond ; Kimberly Strong
• 关键词：FTIR ; Intercomparison ; Remote sensing ; Atmospheric trace gases ; Infrared spectroscopy
• 刊名：Journal of Quantitative Spectroscopy and Radiative Transfer
• 出版年：2008
• 出版时间：August-September 2008
• 年：2008
• 卷：109
• 期：12-13
• 页码：2244-2260
• 全文大小：676 K

文摘

Simultaneous measurements of O₃, HCl, N₂O, and CH₄ were recorded by two infrared Fourier transform spectrometers of differing resolution (0.004 and ) over a period of four months in the summer of 2005. These coincident observations were made at the Toronto Atmospheric Observatory, a complementary site of the Network for the Detection of Atmospheric Composition Change, and provide one of the longest records of simultaneously recorded ground-based infrared spectra to date. Retrievals performed on the spectra utilized the SFIT2 optimal estimation algorithm with HITRAN 2004 spectroscopic parameters. The influence of instrument resolution was considered in relation to the respective averaging kernels, with the predicted influence of multiplicative bias agreeing well with the observed influence for the stratospheric species. The retrieved column amounts correlated well for the stratospheric gases (R²>0.6) but poorer correlations were observed for the well-mixed tropospheric species that were investigated. The median column differences observed by the instruments are -1.7 % and 2.7 % in two different micro-windows of O₃, 2.2 % for HCl, -0.36 % for N₂O, and 3.7 % for CH₄.