Details

Autor(en) / Beteiligte

• Steffensen, Jørgen Peder
• Andersen, Katrine K.
• Bigler, Matthias
• Clausen, Henrik B.
• Dahl-Jensen, Dorthe
• Fischer, Hubertus
• Goto-Azuma, Kumiko
• Hansson, Margareta
• Johnsen, Sigfús J.
• Jouzel, Jean
• Masson-Delmotte, Valérie
• Popp, Trevor
• Rasmussen, Sune O.
• Röthlisberger, Regine
• Ruth, Urs
• Stauffer, Bernhard
• Siggaard-Andersen, Marie-Louise
• Sveinbjörnsdóttir, Arný E.
• Svensson, Anders
• White, James W. C.

Titel

High-Resolution Greenland Ice Core Data Show Abrupt Climate Change Happens in Few Years

Ist Teil von

• Science (American Association for the Advancement of Science), 2008-08, Vol.321 (5889), p.680-684

Ort / Verlag

Washington, DC: American Association for the Advancement of Science

Erscheinungsjahr

2008

Quelle

Science Online_科学在线

Beschreibungen/Notizen

• 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 Intertopical 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.