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Nature 394, 739-743 (20 August 1998) | doi:10.1038/29447;
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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 glaciation 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|[thinsp]|kyr before present lag their Antarctic counterpart by more than 1|[thinsp]|kyr. On average, Antarctic climate change leads that of Greenland by 1–2.5|[thinsp]|kyr over the period 47–23|[thinsp]|kyr before present.
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