Deglacial laminated facies on the NW European continental margin: The hydrographic significance of British‐Irish Ice Sheet deglaciation and Fleuve Manche paleoriver discharges
Deglacial laminated facies on the NW European continental margin: The hydrographic significance of British‐Irish Ice Sheet deglaciation and Fleuve Manche paleoriver discharges
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欧洲大陆边缘西北部的冰消层状相：英国-爱尔兰冰盖消冰作用和弗勒芒什古河流排放的水文学意义
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发表时间：
2007
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影响因子：
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通讯作者：
A. Reijonen
中科院分区：
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作者：
F. Eynaud;S. Zaragosi;J. Scourse;M. Mojtahid;J. Bourillet;I. Hall;A. Penaud;M. Locascio;A. Reijonen
我们收集了欧洲西北边缘（东北大西洋）凯尔特板块四个高沉积速率半深海序列的结果，研究了该地区近几个气候周期的古海洋学和古气候演变。我们关注的是冰期转变的特征。我们采用多代理沉积学，地球化学和微古生物学方法，对特定间隔应用低至10微米的采样分辨率。研究表明，比斯开湾水文与近端不列颠-爱尔兰冰盖（BIIS）和西欧大陆的冰川/去冰史之间存在关系。我们发现，在所有研究的岩心中，纹层沉积与主要的BIIS去冰期同时发生。淡水突然排放到公海的证据突出了这类事件在区域范围内的影响。考虑到比斯开湾与大西洋经向翻转环流（AMOC）现在和过去的关键位置，我们讨论了它们在全球范围内的影响。
We have compiled results obtained from four high sedimentation rate hemipelagic sequences from the Celtic sector of the NW European margin (NE Atlantic) to investigate the paleoceanographic and paleoclimatic evolution of the area over the last few climatic cycles. We focus on periods characteristic of deglacial transitions. We adopt a multiproxy sedimentological, geochemical, and micropaleontological approach, applying a sampling resolution down to ten microns for specific intervals. The investigation demonstrates the relationships between the Bay of Biscay hydrography and the glacial/deglacial history of both the proximal British‐Irish Ice Sheet (BIIS) and the western European continent. We identify recurrent phases of laminae deposition concurrent with major BIIS deglacial episodes in all the studied cores. Evidence for abrupt freshwater discharges into the open ocean highlights the influence of such events at a regional scale. We discuss their impact at a global scale considering the present and past key location of the Bay of Biscay versus the Atlantic Meridional Overturning Circulation (AMOC).