Greenland temperature response to climate forcing during the last deglaciation

TitleGreenland temperature response to climate forcing during the last deglaciation
Publication TypeJournal Article
Year of Publication2014
AuthorsBuizert C, Gkinis V., Severinghaus JP, He F., Lecavalier B.S, Kindler P., Leuenberger M., Carlson A.E, Vinther B., Masson-Delmotte V., White J.WC, Liu Z.Y, Otto-Bliesner B., Brook E.J
JournalScience
Volume345
Pagination1177-1180
Date Published2014/09
Type of ArticleArticle
ISBN Number0036-8075
Accession NumberWOS:000341179800046
Keywordsaccumulation; antarctica; circulation; diffusion; glacial termination; ice core; polar ice; seasonality; sensitivity; trapped air
Abstract

Greenland ice core water isotopic composition (delta O-18) provides detailed evidence for abrupt climate changes but is by itself insufficient for quantitative reconstruction of past temperatures and their spatial patterns. We investigate Greenland temperature evolution during the last deglaciation using independent reconstructions from three ice cores and simulations with a coupled ocean-atmosphere climate model. Contrary to the traditional delta O-18 interpretation, the Younger Dryas period was 4.5 degrees +/- 2 degrees C warmer than the Oldest Dryas, due to increased carbon dioxide forcing and summer insolation. The magnitude of abrupt temperature changes is larger in central Greenland (9 degrees to 14 degrees C) than in the northwest (5 degrees to 9 degrees C), fingerprinting a North Atlantic origin. Simulated changes in temperature seasonality closely track changes in the Atlantic overturning strength and support the hypothesis that abrupt climate change is mostly a winter phenomenon.

DOI10.1126/science.1254961
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