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High-Resolution Greenland Ice Core Data Show Abrupt Climate Change Happens in Few Years
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2008 (English)In: Science, Vol. 321, 680-684 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2008. Vol. 321, 680-684 p.
Keyword [en]
climate, ice cores, Greenland
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-14695DOI: doi:10.1126/science.1157707ISI: 000258077700041OAI: diva2:181215
Available from: 2008-10-24 Created: 2008-10-24 Last updated: 2011-01-10Bibliographically approved

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Department of Physical Geography and Quaternary Geology
Earth and Related Environmental Sciences

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