Multi-decade measurements of the long-term trends of atmospheric species by high-spectral-resolution infrared solar absorption spectroscopy

摘要: Abstract Solar absorption spectra were recorded for the first time in 5 years with McMath Fourier transform spectrometer at US National Observatory on Kitt Peak southern Arizona, USA (31.91°N latitude, 111.61°W longitude, 2.09 km altitude). The solar cover 750–1300 and 1850–5000 cm −1 20 days during March–June 2009. measurements mark continuation of a long-term record atmospheric chemical composition that have been used to quantify seasonal cycles trends both tropospheric stratospheric species from observations began 1977. Fits measured performed, they indicate obtained since return operational status are nearly free channeling instrument line shape function is well reproduced taking into account measurement parameters. We report updated series total columns six their analysis trends. As an example, fit shows decrease annual increase rate Montreal-Protocol-regulated chlorofluorocarbon CCl 2 F 1.51±0.38% yr beginning span −1.54±1.28% yr end span, 1 sigma, hence provides evidence impact those regulations trend.