Atmospheric CO 2 and Climate on Millennial Time Scales During the Last Glacial Period
- 3 October 2008
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 322 (5898), 83-85
- https://doi.org/10.1126/science.1160832
Abstract
Reconstructions of ancient atmospheric carbon dioxide (CO 2 ) variations help us better understand how the global carbon cycle and climate are linked. We compared CO 2 variations on millennial time scales between 20,000 and 90,000 years ago with an Antarctic temperature proxy and records of abrupt climate change in the Northern Hemisphere. CO 2 concentration and Antarctic temperature were positively correlated over millennial-scale climate cycles, implying a strong connection to Southern Ocean processes. Evidence from marine sediment proxies indicates that CO 2 concentration rose most rapidly when North Atlantic Deep Water shoaled and stratification in the Southern Ocean was reduced. These increases in CO 2 concentration occurred during stadial (cold) periods in the Northern Hemisphere, several thousand years before abrupt warming events in Greenland.Keywords
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