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Science 8 December 2000:
Vol. 290. no. 5498, pp. 1951 - 1954
DOI: 10.1126/science.290.5498.1951
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Reports

Synchronous Radiocarbon and Climate Shifts During the Last Deglaciation

Konrad A. Hughen,1* John R. Southon,2 Scott J. Lehman,3 Jonathan T. Overpeck4

Radiocarbon data from the Cariaco Basin provide calibration of the carbon-14 time scale across the period of deglaciation (15,000 to 10,000 years ago) with resolution available previously only from Holocene tree rings. Reconstructed changes in atmospheric carbon-14 are larger than previously thought, with the largest change occurring simultaneously with the sudden climatic cooling of the Younger Dryas event. Carbon-14 and published beryllium-10 data together suggest that concurrent climate and carbon-14 changes were predominantly the result of abrupt shifts in deep ocean ventilation.

1 Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.
2 Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94551, USA.
3 Institute of Arctic and Alpine Research and Department of Geological Sciences, University of Colorado, Boulder, CO 80309, USA.
4 Institute for the Study of Planet Earth and Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA.
*   To whom correspondence should be addressed. E-mail: khughen{at}whoi.edu

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