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

机译:上一个冰川期南极和格陵兰岛气候变化的异步性

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摘要

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 glaciatlon 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.
机译:气候动力学的中心问题是了解气候事件期间北半球和南半球如何耦合。在最后一次冰川期间,格陵兰观测到的最强的快速温度变化(所谓的Dansgaard-Oeschger事件)与南极洲的温度记录类似。对南极洲和格陵兰岛冰芯中记录的甲烷全球大气浓度的比较,可以确定这些温度变化的相位关系(超前或滞后)。目前,格陵兰岛变暖事件发生在36和45年左右之前,比南极气候变暖事件晚了1年以上。在目前的47-23年间,南极气候变化平均领先格陵兰岛1-2.5年。

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