New constraints on European glacial freshwater releases to the North Atlantic Ocean
New constraints on European glacial freshwater releases to the North Atlantic Ocean
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DOI：
10.1029/2012gl052100
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发表时间：
2012-08-01
影响因子：
5.2
通讯作者：
Auffret, Gerard
中科院分区：
文献类型：
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作者：
Eynaud, Frederique;Malaize, Bruno;Auffret, Gerard
[1]在第四纪晚期，外部和内部强迫都驱动了从冰期到间冰期的重大气候变化。非线性的气候步骤的特点是过渡到这些极值，中间的偏移特别好地表达在动态的北方半球冰冻圈。在这里，我们记录了这些动态的影响，北大西洋东北部，集中在35-10万年的时间间隔。海面盐度已重建定量的基础上两个独立的方法从核心MD 95 -2002，恢复从比斯开湾北方邻近的芒什古河流出口的轴，从而与近端欧洲冰盖和冰川。定量重建来自dinocyst和浮游有孔虫分析已结合在一个强大的年表，以评估该地区的水文变化的幅度和时间。我们的研究证明了强脉冲淡水排放可能影响了北大西洋经向翻转环流。
[1] During the late Quaternary, both external and internal forcings have driven major climatic shifts from glacial to interglacial conditions. Nonlinear climatic steps characterized the transitions leading to these extrema, with intermediate excursions particularly well expressed in the dynamics of the Northern Hemisphere cryosphere. Here we document the impact of these dynamics on the north-eastern North Atlantic Ocean, focussing on the 35-10 ka interval. Sea-surface salinities have been reconstructed quantitatively based on two independent methods from core MD95-2002, recovered from the northern Bay of Biscay adjacent to the axis of the Manche paleoriver outlet and thus in connection with proximal European ice sheets and glaciers. Quantitative reconstructions deriving from dinocyst and planktonic foraminiferal analyses have been combined within a robust chronology to assess the amplitude and timing of hydrological changes in this region. Our study evidences strong pulsed freshwater discharges which may have impacted the North Atlantic Meridional Overturning Circulation.