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High-resolution Greenland ice core data show abrupt climate change happens in a few years

By Jorgen Peder Steffensen, Katrine K. Andersen, Matthias Bigler, Henrik B. Clausen, Dorthe Dahl-Jensen, Hubertus Fischer, Kumiko Goto-Azuma, Margareta Hansson, Sigfus J. Johnsen, Jean Jouzel, Valerie Masson-Delmotte, Trevor Popp, Sune O. Rasmussen, Regine Rothlisberger, Urs Ruth, Bernhard Stauffer, Marie-Louise Siggaard-Andersen, Arny E. Sveinbj√∂rnsdottir, Anders Svensson and James W.C. White

Abstract

The last two abrupt warmings at the onset of our present warm interglacial period, interrupted by the Younger Dryas cooling event, were investigated at high temporal resolution from the North Greenland Ice Core Project ice core. The deuterium excess, a proxy of Greenland precipitation moisture source, switched mode within 1 to 3 years over these transitions and initiated a more gradual change (over 50 years) of the Greenland air temperature, as recorded by stable water isotopes. The onsets of both abrupt Greenland warmings were slightly preceded by decreasing Greenland dust deposition, reflecting the wetting of Asian deserts. A northern shift of the Intertropical Convergence Zone could be the trigger of these abrupt shifts of Northern Hemisphere atmospheric circulation, resulting in changes of 2 to 4 kelvin in Greenland moisture source temperature from one year to the next

Topics: Meteorology and Climatology, Glaciology, Atmospheric Sciences
Publisher: American Association for the Advancement of Science
Year: 2008
DOI identifier: 10.1126/science.1157707
OAI identifier: oai:nora.nerc.ac.uk:5684
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