Abstract
THE 13C/12C ratio of atmospheric carbon dioxide has decreased by approximately 0.6‰ over 22 yr according to new direct measurements reported here. Our results offer a way of establishing whether 13C/12C ratios of tree rings1–6 are representative of atmospheric 13CO2 variations. We have carried out both isotopic (at Groningen) and concentration (at La Jolla) measurements of atmospheric CO2 on air samples obtained during 1977 and 1978 at three widely spaced locations: La Jolla, California (33°N, 117°W), Fanning Island (4°N, 159°W) and the South Pole. Sampling, instrumental, and analytical procedures closely matched a similar study carried out 22 yr earlier by Keeling7,8.
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KEELING, C., MOOK, W. & TANS, P. Recent trends in the 13C/12C ratio of atmospheric carbon dioxide. Nature 277, 121–123 (1979). https://doi.org/10.1038/277121a0
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DOI: https://doi.org/10.1038/277121a0
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