Deep-water circulation changes lead North Atlantic climate during deglaciation
Deep-water circulation changes lead North Atlantic climate during deglaciation
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DOI：
10.1038/s41467-019-09237-3
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发表时间：
2019-03
影响因子：
16.6
通讯作者：
F. Muschitiello;W. D'Andrea;A. Schmittner;T. Heaton;N. Balascio;Nicole deRoberts;M. Caffee;T. Woodruff
中科院分区：
文献类型：
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作者：
F. Muschitiello;W. D'Andrea;A. Schmittner;T. Heaton;N. Balascio;Nicole deRoberts;M. Caffee;T. Woodruff
限制气候系统对北大西洋深水（NADW）形成变化的响应时间是改善气候和大西洋经向翻转环流可预测性的基础。在这里，我们报告了一个新的同步陆地，海洋和冰芯记录，这使得北大西洋气候的响应时间的第一个定量测定在最后一次冰消期高纬度NADW形成率的变化。使用连续记录的深水通风从北欧海域，我们确定了一个400年的领先地位的变化，在高纬度NADW的形成之前，在格陵兰冰芯记录在新仙女木stadial的开始和结束，这可能发生在响应逐渐变化的温度和风驱动的淡水运输的突然气候变化。我们认为，北欧海洋深水环流的变化是气候突变的前兆，未来的模式研究应解决这一阶段。
Constraining the response time of the climate system to changes in North Atlantic Deep Water (NADW) formation is fundamental to improving climate and Atlantic Meridional Overturning Circulation predictability. Here we report a new synchronization of terrestrial, marine, and ice-core records, which allows the first quantitative determination of the response time of North Atlantic climate to changes in high-latitude NADW formation rate during the last deglaciation. Using a continuous record of deep water ventilation from the Nordic Seas, we identify a ∼400-year lead of changes in high-latitude NADW formation ahead of abrupt climate changes recorded in Greenland ice cores at the onset and end of the Younger Dryas stadial, which likely occurred in response to gradual changes in temperature- and wind-driven freshwater transport. We suggest that variations in Nordic Seas deep-water circulation are precursors to abrupt climate changes and that future model studies should address this phasing.