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- Julian P. Sachs
- Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309–0450, USA.
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- Scott J. Lehman
- Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309–0450, USA.
説明
<jats:p>A reconstruction of sea surface temperature based on alkenone unsaturation ratios in sediments of the Bermuda Rise provides a detailed record of subtropical climate from 60,000 to 30,000 years ago. Northern Sargasso Sea temperatures changed repeatedly by 2° to 5°C, covarying with high-latitude temperatures that were previously inferred from Greenland ice cores. The largest temperature increases were comparable in magnitude to the full glacial-Holocene warming at the site. Abrupt cold reversals of 3° to 5°C, lasting less than 250 years, occurred during the onset of two such events (Greenland interstadials 8 and 12), suggesting that the largest, most rapid warmings were especially unstable.</jats:p>
収録刊行物
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- Science
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Science 286 (5440), 756-759, 1999-10-22
American Association for the Advancement of Science (AAAS)