Enhanced sea-ice export from the Arctic during the Younger Dryas
Enhanced sea-ice export from the Arctic during the Younger Dryas
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DOI：
10.1038/ncomms1658
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发表时间：
2012-01
影响因子：
16.6
通讯作者：
C. Not;C. Hillaire‐Marcel
中科院分区：
文献类型：
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作者：
C. Not;C. Hillaire‐Marcel
最后一次冰消期的新仙女木寒流和相关的大西洋纬向翻转环流的减缓与一系列过程有关，特别是与冰川湖阿加西斯部分排水有关的淡水流入北大西洋。在这里，我们观察到一个主要的排水事件，在海洋沉积物的核心提出了从罗蒙诺索夫海岭，在北冰洋中部的脉冲标志着在碎屑岩石灰岩。这表明北极-加拿大沉积物源区的新仙女木冰川漂流沉积速率是全新世的五倍。因此，我们的研究结果支持的假设，在加拿大北极地区的冰川排水事件，在新仙女木的开始，提高海冰生产和漂流通过北极，然后通过弗拉姆海峡出口，对大西洋纬向翻转环流的北方北大西洋网站。
The Younger Dryas cold spell of the last deglaciation and related slowing of the Atlantic meridional overturning circulation have been linked to a large array of processes, notably an influx of fresh water into the North Atlantic related to partial drainage of glacial Lake Agassiz. Here we observe a major drainage event, in marine sediment cores raised from the Lomonosov Ridge, in the central Arctic Ocean marked by a pulse in detrital dolomitic-limestones. This points to an Arctic-Canadian sediment source area with about fivefold higher Younger Dryas ice-rafting deposition rate, in comparison with the Holocene. Our findings thus support the hypothesis of a glacial drainage event in the Canadian Arctic area, at the onset of the Younger Dryas, enhancing sea-ice production and drifting through the Arctic, then export through Fram Strait, towards Atlantic meridional overturning circulation sites of the northern North Atlantic.