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Science 4 February 1994:
Vol. 263. no. 5147, pp. 663 - 665
DOI: 10.1126/science.263.5147.663
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Articles

Tropical Temperature Variations Since 20,000 Years Ago: Modulating Interhemispheric Climate Change

Thomas P. Guilderson 1, Richard G. Fairbanks 1, and James L. Rubenstone 1

1 Lamont-Doherty Earth Observatory of Columbia University, Route 9-W, Palisades, NY 10964

Tropical sea surface temperatures (SSTs), as thermodynamically recorded in Barbados corals, were 5°C colder than present values 19,000 years ago. Variable tropical SSTs may explain the interhemispheric synchroneity of global climate change as recorded in ice cores, snowline reconstructions, and vegetation records. Radiative changes due to cloud type and cloud cover are plausible mechanisms for maintaining cooler tropical SSTs in the past.

Submitted on October 26, 1993
Accepted on December 28, 1993


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