CORRELATIONS BETWEEN CLIMATE RECORDS FROM NORTH-ATLANTIC SEDIMENTS AND GREENLAND ICE
CORRELATIONS BETWEEN CLIMATE RECORDS FROM NORTH-ATLANTIC SEDIMENTS AND GREENLAND ICE
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DOI：
10.1038/365143a0
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发表时间：
1993-09-09
期刊：
影响因子：
64.8
通讯作者：
BONANI, G
中科院分区：
文献类型：
--
作者：
BOND, G;BROECKER, W;BONANI, G
格陵兰冰中的氧同位素测量表明，一系列快速的冷暖振荡（称为丹斯加德-厄施格事件）打断了最后一次冰川作用1。在这里，我们展示了过去 90 公里的北大西洋沉积物的海面温度记录，其中包含一系列与冰芯记录中的快速温度振荡非常匹配的温度振荡，证实了海洋必须带有 Dansgaard-Oeschger 事件印记的预测2,3。此外，我们表明，在 20 至 80 kyr 之前，海洋大气温度的变化与冷却循环捆绑在一起，平均持续 10 至 15 kyr，并具有不对称的锯齿形状。每个周期的最终结果是大量冰山流入北大西洋（“海因里希事件”4,5），随后气候突然转变为变暖。这些循环记录了冰盖行为与海洋大气温度变化之间以前未被认识到的联系。有待解决的一个重要问题是，这些循环是由轨道强迫等外部因素驱动的，还是由内部冰盖动力学驱动的。
OXYGEN isotope measurements in Greenland ice demonstrate that a series of rapid warm-cold oscillations-called Dansgaard-Oeschger events-punctuated the last glaciation1. Here we present records of sea surface temperature from North Atlantic sediments spanning the past 90 kyr which contain a series of rapid temperature oscillations closely matching those in the ice-core record, confirming predictions that the ocean must bear the imprint of the Dansgaard-Oeschger events2,3. Moreover, we show that between 20 and 80 kyr ago, the shifts in ocean-atmosphere temperature are bundled into cooling cycles, lasting on average 10 to 15 kyr, with asymmetrical saw-tooth shapes. Each cycle culminated in an enormous discharge of icebergs into the North Atlantic (a 'Heinrich event'4,5), followed by an abrupt shift to a warmer climate. These cycles document a previously unrecognized link between ice sheet behaviour and ocean-atmosphere temperature changes. An important question that remains to be resolved is whether the cycles are driven by external factors, such as orbital forcing, or by internal ice-sheet dynamics.