Coherent patterns of ice-rafted debris deposits in the Nordic regions during the last glacial (10–60 ka)
Coherent patterns of ice-rafted debris deposits in the Nordic regions during the last glacial (10–60 ka)
复制标题
末次冰期（10-60ka）期间北欧地区冰筏碎片沉积的一致模式
DOI：
10.1016/s0012-821x(01)00561-1
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发表时间：
2001
影响因子：
5.3
通讯作者：
S. Manthé
中科院分区：
文献类型：
--
作者：
M. Elliot;L. Labeyrie;T. Dokken;S. Manthé
通过结合放射性碳测年法和物理性质的调整，我们同步记录了10至50ka末次冰河期挪威海和伊尔明格盆地三个沉积物岩心的冰筏岩石碎片沉积物。我们的同步记录表明，在海因里希事件期间，与劳伦泰德冰盖的重大崩塌几乎同时发生的整个北欧地区沉积了富含冰筏碎片的层。还有千禧年规模、连贯且接近同步的冰筏岩石碎片沉积到挪威海，这与芬诺-斯堪的纳维亚冰山流量的重复变化有关。丹斯加德-厄施格温度记录的寒冷阶段的相关性表明，末次冰期期间大气温度振荡与进入挪威海的冰山通量变化之间存在密切联系。大气环流模式的变化给高纬度地区带来了水分供应，而这种水分在北半球不同沿海冰盖和冰架上的分布可能会控制冰盖前进的时间和冰山向公海的通量。
We have synchronized records of ice-rafted rock debris deposits of three sediment cores from the Norwegian Sea and the Irminger Basin during the last glacial period from 10 to 50 ka by combining the use of radiocarbon dates and adjustments of physical properties. Our synchronized records indicate that layers rich in ice-rafted debris were deposited throughout the Nordic regions at times near to synchronous with the major collapses of the Laurentide ice sheet: during the Heinrich events. There are also millennial-scale, coherent and near to synchronous deposits of ice-rafted rock debris into the Norwegian Sea related to repetitive changes of the flux of icebergs from the Fenno-Scandinavian. The correlation with the cold phases of the Dansgaard–Oeschger temperature record points to a close coupling between atmospheric temperature oscillations and variations of iceberg fluxes into the Norwegian Sea during the last glacial. Variations in atmospheric circulation patterns bringing moisture supply to high latitudes and the distribution of this moisture over the different Northern Hemisphere coastal ice sheets and ice shelves could be controlling both the timing of ice sheet advances and the flux of iceberg to the open ocean.