Interhemispheric Atlantic seesaw response during the last deglaciation
Interhemispheric Atlantic seesaw response during the last deglaciation
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DOI：
10.1038/nature07770
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发表时间：
2009-02-26
期刊：
影响因子：
64.8
通讯作者：
Broecker, Wallace S.
中科院分区：
文献类型：
--
作者：
Barker, Stephen;Diz, Paula;Broecker, Wallace S.
上一次冰川时期格陵兰和南极洲上空千年尺度的温度变化之间的不同步关系导致了两极秋千的概念，它根据大西洋内经向翻转环流的状态来重新分配热量。在这里，我们展示了来自南大西洋的新记录，这些记录显示了上一次冰川消融期间的快速变化，这些变化是瞬时的(在测年不确定性范围内)，与在北大西洋观察到的记录相反。我们的结果表明，与大西洋经向翻转环流变化有关的突变与南大洋特有的更渐进的调整之间存在直接联系。这些结果强调了南大洋对千年尺度气候变率的发展和传播的重要性，并突出了南大洋在消融气候变化和大气二氧化碳相关上升方面的作用。
The asynchronous relationship between millennial-scale temperature changes over Greenland and Antarctica during the last glacial period has led to the notion of a bipolar seesaw which acts to redistribute heat depending on the state of meridional overturning circulation within the Atlantic Ocean. Here we present new records from the South Atlantic that show rapid changes during the last deglaciation that were instantaneous (within dating uncertainty) and of opposite sign to those observed in the North Atlantic. Our results demonstrate a direct link between the abrupt changes associated with variations in the Atlantic meridional overturning circulation and the more gradual adjustments characteristic of the Southern Ocean. These results emphasize the importance of the Southern Ocean for the development and transmission of millennial-scale climate variability and highlight its role in deglacial climate change and the associated rise in atmospheric carbon dioxide.