Abstract
Published total vertical column amounts of carbon monoxide deduced from infrared solar spectra recorded during 1950–51 in the Swiss Alps have been reanalysed based on improved spectroscopic parameters for CO and a curve of growth. From a comparison of the 1950–51 results and modern measurements, an average increase of ∼2% per year in the free tropospheric concentration of CO above Europe is estimated for 1950–77.
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