Synchroneity of tropical and high-latitude Atlantic temperatures over the last glacial termination

David W. Lea, Dorothy K. Pak, Larry C. Peterson, Konrad A. Hughen

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Abstract

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 turface-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.

Original languageEnglish (US)
Pages (from-to)1361-1364
Number of pages4
JournalScience
Volume301
Issue number5638
DOIs
StatePublished - Sep 5 2003

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