Nature 306, 319 - 322 (24 November 1983); doi:10.1038/306319a0

Carbon isotope data in core V19-30 confirm reduced carbon dioxide concentration in the ice age atmosphere

N. J. Shackleton, M. A. Hall, J. Line & Cang Shuxi

Godwin Laboratory for Quaternary Research, University of Cambridge, Cambridge CB2 3RS, UK

Precise and detailed measurements have been made of the ¹³C content of both planktonic and benthic foraminifera in core V 19-30. Using the approach developed by Broecker, a record of atmospheric CO₂ concentration during the past 120,000 years has been derived which provides independent confirmation that the CO₂ concentration in the glacial-age atmosphere was much lower than it is today.

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