Asynchrony of antarctic and greenland climate change during the last glacial period
A central issue in climate dynamics is to understand how the Northern and Southern hemispheres are coupled during climate events. The strongest of the fast temperature changes observed in Greenland (so-called Dansgaard- Oeschger events) during the last glaclation have an analogue in the temperature...
Published in: | Nature |
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Main Authors: | , , , , , , , , , , |
Format: | Text |
Language: | unknown |
Published: |
London, Springer Science and Business Media LLC
2022
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Subjects: | |
Online Access: | https://doi.org/10.1038/29447 http://infoscience.epfl.ch/record/298277 |
Summary: | A central issue in climate dynamics is to understand how the Northern and Southern hemispheres are coupled during climate events. The strongest of the fast temperature changes observed in Greenland (so-called Dansgaard- Oeschger events) during the last glaclation have an analogue in the temperature record from Antarctica. A comparison of the global atmospheric concentration of methane as recorded in ice cores from Antarctica and Greenland permits a determination of the phase relationship (in leads or lags) of these temperature variations. Greenland warming events around 36 and 45 kyr before present lag their Antarctic counterpart by more than 1 kyr. On average, Antarctic climate change leads that of Greenland by 1-2.5 kyr over the period 47-23 kyr before present. |
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