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Nature. 2003 Jan 9;421(6919):152-5.

Magnitude and timing of temperature change in the Indo-Pacific warm pool during deglaciation.

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  • 1Department of Geological Sciences, University of South Carolina, Columbia, South Carolina 29205, USA.

Abstract

Ocean-atmosphere interactions in the tropical Pacific region have a strong influence on global heat and water vapour transport and thus constitute an important component of the climate system. Changes in sea surface temperatures and convection in the tropical Indo-Pacific region are thought to be responsible for the interannual to decadal climate variability observed in extra-tropical regions, but the role of the tropics in climate changes on millennial and orbital timescales is less clear. Here we analyse oxygen isotopes and Mg/Ca ratios of foraminiferal shells from the Makassar strait in the heart of the Indo-Pacific warm pool, to obtain synchronous estimates of sea surface temperatures and ice volume. We find that sea surface temperatures increased by 3.5-4.0 degrees C during the last two glacial-interglacial transitions, synchronous with the global increase in atmospheric CO2 and Antarctic warming, but the temperature increase occurred 2,000-3,000 years before the Northern Hemisphere ice sheets melted. Our observations suggest that the tropical Pacific region plays an important role in driving glacial-interglacial cycles, possibly through a system similar to how El NiƱo/Southern Oscillation regulates the poleward flux of heat and water vapour.

PMID:
12520298
DOI:
10.1038/nature01297
[PubMed - indexed for MEDLINE]
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