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Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes

机译：与冰河气候变化有关的大西洋子午环流的崩溃和快速恢复

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摘要

The Atlantic meridional overturning circulation is widely believed to affect climate. Changes in ocean circulation have been inferred from records of the deep water chemical composition derived from sedimentary nutrient proxies(1), but their impact on climate is difficult to assess because such reconstructions provide insufficient constraints on the rate of overturning(2). Here we report measurements of Pa-231/(230) Th, a kinematic proxy for the meridional overturning circulation, in a sediment core from the subtropical North Atlantic Ocean. We find that the meridional overturning was nearly, or completely, eliminated during the coldest deglacial interval in the North Atlantic region, beginning with the catastrophic iceberg discharge Heinrich event H1, 17,500 yr ago, and declined sharply but briefly into the Younger Dryas cold event, about 12,700 yr ago. Following these cold events, the Pa-231/(230) Th record indicates that rapid accelerations of the meridional overturning circulation were concurrent with the two strongest regional warming events during deglaciation. These results confirm the significance of variations in the rate of the Atlantic meridional overturning circulation for abrupt climate changes.
机译：人们普遍认为大西洋经向翻转环流会影响气候。从沉积营养物代理得出的深水化学成分的记录可以推断出海洋环流的变化（1），但由于对此类结构的重建对倾覆速率的限制不足，因此很难评估其对气候的影响（2）。在这里，我们报告了P​​a-231 /（230）Th的测量值，Pa-231 /（230）Th是子午颠覆环流的运动学代名词，位于亚热带北大西洋的沉积岩心中。我们发现，在北大西洋地区最冷的冰期间隔中，子午线的倾覆几乎或完全被消除，从灾难性的冰山排放海因里希事件H1（17500年前）开始，并急剧下降，但短暂地下降到了年轻得里亚斯低温事件，大约在12,700年前。在这些冷事件之后，Pa-231 /（230）Th记录表明，在冰消冰期间，子午翻转循环的快速加速与两个最强烈的区域变暖事件同时发生。这些结果证实了对于突然的气候变化而言，大西洋子午线翻转循环速率变化的重要性。

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