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Science 5 September 2003:
Vol. 301. no. 5638, pp. 1361 - 1364
DOI: 10.1126/science.1088470
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Reports

Synchroneity of Tropical and High-Latitude Atlantic Temperatures over the Last Glacial Termination

David W. Lea,1* Dorothy K. Pak,1 Larry C. Peterson,2 Konrad A. Hughen3

A high-resolution western tropical Atlantic sea surface temperature (SST) record from the Cariaco Basin on the northern Venezuelan shelf, based on Mg/Ca values in surface-dwelling planktonic foraminifera, reveals that changes in SST over the last glacial termination are synchronous, within ±30 to ±90 years, with the Greenland Ice Sheet Project 2 air temperature proxy record and atmospheric methane record. The most prominent deglacial event in the Cariaco record occurred during the Younger Dryas time interval, when SSTs dropped by 3° to 4°C. A rapid southward shift in the atmospheric intertropical convergence zone could account for the synchroneity of tropical temperature, atmospheric methane, and high-latitude changes during the Younger Dryas.

1 Department of Geological Sciences and Marine Science Institute, University of California, Santa Barbara, CA 93106, USA.
2 Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL 33149, USA.
3 Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.

* To whom correspondence should be addressed. E-mail: lea{at}geol.ucsb.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)