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Science 9 November 2001:
Vol. 294. no. 5545, pp. 1328 - 1331
DOI: 10.1126/science.1063678
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Reports

Centennial-Scale Holocene Climate Variability Revealed by a High-Resolution Speleothem &dgr;18O Record from SW Ireland

Frank McDermott,1 David P. Mattey,2 Chris Hawkesworth3

Evaluating the significance of Holocene submillennial delta 18O variability in the Greenland ice cores is crucial for understanding how natural climate oscillations may modulate future anthropogenic warming. A high-resolution oxygen isotope record from a speleothem in southwestern Ireland provides evidence for centennial-scale delta 18O variations that correlate with subtle delta 18O changes in the Greenland ice cores, indicating regionally coherent variability in the early Holocene. Evidence for previously undetected early Holocene cooling events is presented, but mid- to late-Holocene ice rafting in the North Atlantic appears to have had little impact on delta 18O at this ocean margin site.

1 Department of Geology, University College Dublin, Dublin 4, Ireland.
2 Geology Department, Royal Holloway College, University of London, Egham, Surrey, TW20 OEX, UK.
3 Department of Earth Sciences, Bristol University, Bristol BS8 1RJ, UK.

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