Asynchrony of Antarctic and Greenland climate change during the last glacial period

Blunier, T.; Chappellaz, J.; Schwander, J.; Dällenbach, A.; Stauffer, B; Stocker, T. F.; Raynaud, D.; Jouzel, J.; Clausen, H.; Hammer, C.; Johnsen, S. (1998). Asynchrony of Antarctic and Greenland climate change during the last glacial period. Nature, 394(6695), pp. 739-743. Macmillan Journals Ltd. 10.1038/29447

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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 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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