Synchroneity of Tropical and High-Latitude Atlantic Temperatures over the Last Glacial Termination
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 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.
- Publication:
-
Science
- Pub Date:
- September 2003
- DOI:
- 10.1126/science.1088470
- Bibcode:
- 2003Sci...301.1361L
- Keywords:
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- OCEANS