Holocene Southern Ocean surface temperature variability west of the Antarctic Peninsula

A. E. Shevenell (), A. E. Ingalls, E. W. Domack and C. Kelly
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A. E. Shevenell: School of Oceanography, University of Washington
A. E. Ingalls: School of Oceanography, University of Washington
E. W. Domack: Hamilton College
C. Kelly: School of Oceanography, University of Washington

Nature, 2011, vol. 470, issue 7333, 250-254

Abstract: Shifting influences on Antarctic climate The Antarctic Peninsula is currently one of the fastest-warming locations on Earth, but its long-term variability has remained unclear. Amelia Shevenell and colleagues now use the TEX86 proxy, a palaeothermometer that tracks membrane lipids of the marine picoplankton Crenarchaeota, to show that a long-term cooling of about 4 °C occurred in waters near the tip of Antarctic Peninsula over the past 12,000 years. This is consistent with orbitally controlled changes in insolation. Shorter-term variability in temperature seems to have been strongly influenced by the position of the westerly winds. This work suggests that the present influence of the El-Nino Southern Oscillation system on the Antarctic Peninsula is a relatively recent phenomenon, dating to the late Holocene.

Date: 2011
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DOI: 10.1038/nature09751

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