Links between the East Asian monsoon and North Atlantic climate during the 8,200 year event
Links between the East Asian monsoon and North Atlantic climate during the 8,200 year event
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8200年事件期间东亚季风与北大西洋气候之间的联系
DOI：
10.1038/ngeo1708
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发表时间：
2013-02-01
影响因子：
18.3
通讯作者：
Xie, S-C.
中科院分区：
文献类型：
--
作者：
Liu, Y-H.;Henderson, G. M.;Xie, S-C.
8,200年前北大西洋地区的一次突然变冷事件影响了整个北方半球的气候（1-3）。这一事件在格陵兰冰芯中受到很好的限制，但其他地区记录的分辨率不足，挑战了我们对相关遥相关的时间和性质的理解。来自东亚的洞穴沉积物记录表明，季风变化与8,200年的事件有关，但这些变化的性质仍然存在争议（1，2）。在这里，我们评估东亚降水的变化，在事件中，从一个亚年度解决石笋记录从中国中部。通过对洞穴碳酸盐的δ O-18和Mg/Ca测量，我们发现大约8,200年前气候显著干燥。根据我们的年度层计数年表，我们表明，干旱事件持续了150年，与一个明显的干旱，持续了70年的中心期。该事件的持续时间和演变与格陵兰冰芯中观察到的情况没有什么区别。因此，我们得出结论，一个有效的和快速的大气遥相关存在于北大西洋和季风系统在温暖的气候类似于今天的。
An abrupt cooling event in the North Atlantic region 8,200 years ago affected climate throughout the Northern Hemisphere(1-3). The event is well constrained in Greenland ice cores(3), but lack of resolution in records from other regions has challenged our understanding of the timing and nature of the associated teleconnections. Speleothem records from East Asia have suggested monsoonal changes associated with the 8,200 year event, but the nature of these changes remains controversial(1,2). Here we assess changes in East Asian precipitation during the event from a sub-annually resolved stalagmite record from central China. Using delta O-18 and Mg/Ca measurements of the speleothem carbonate, we show that climate dried significantly about 8,200 years ago. Based on our annual-layer-counted chronology, we show that the dry event lasted 150 years, with a central period of pronounced aridity that lasted 70 years. The duration and evolution of the event is indistinguishable from that observed in the Greenland ice cores. We therefore conclude that an effective and rapid atmospheric teleconnection exists between the North Atlantic and the monsoon system in warm climates similar to today's.