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首页> 外文会议>NATO advanced research workshop on influence of climate change on the changing arctic and sub-arctic conditions; 20080508-10; Liege(BE) >Reconstruction of oceanic circulation using mineralogical and isotopical (Nd/Pb) signatures of deep sea sediments: the case study of the northern North Atlantic and some perspectives for the Arctic
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Reconstruction of oceanic circulation using mineralogical and isotopical (Nd/Pb) signatures of deep sea sediments: the case study of the northern North Atlantic and some perspectives for the Arctic

机译：利用深海沉积物的矿物学和同位素（Nd / Pb）特征重建海洋环流：北大西洋北部的案例研究和北极的一些观点

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This work aims to reconstruct the evolution of deep ocean circulation patterns in the North Atlantic during the last 10-100 kyr using abiotic proxies. Nd and Pb isotopic ratios have been measured on the clay-sized fraction of two sediment cores drilled in the Labrador Sea off southern Greenland (MD99-2227, ODP646). At present this site is under the influence of the Western Boundary Undercurrent that drives the water masses involved in the formation of the North Atlantic Deep Water. Based on an identification of regional sources areas sedimentary isotopic signatures allow to determine the origin of the particles driven by the North Atlantic deep currents: any change in the sediment supplies reflects a relative change in the contribution of the deep water masses. Our isotopic dataset emphasizes several main changes in the relative contribution of the two major components of North Atlantic Deep Water, i.e. the North East Atlantic Deep water (NEADW) and the Denmark Strait Overflow Water (DSOW) throughout the last 12 kyr, and especially during the Late Holocene. The inception of the modern deep circulation seems to be quite recent, occurring during the last 3 kyr. Over glacial/interglacial time-scale deep current variability is less pronounced and/or partly masked by variable proximal supplies. Labrador Sea results emphasize that the application of mineralogical and isotopical tools on sediments allow to monitor variability in sedimentary supplies driven by deep currents. This indirect approach is further promising to identify deep currents pathways and reconstruct past circulation.
机译：这项工作旨在使用非生物代理重建过去10至100年间北大西洋深海循环模式的演变。 Nd和Pb同位素比值是在格陵兰南部海域的拉布拉多海中钻探的两个沉积岩心的黏土大小分数上测得的（MD99-2227，ODP646）。目前，该地点受到西部边界暗流的影响，该西部洋流推动了北大西洋深水形成过程中涉及的水团。基于对区域源区域的识别，沉积同位素特征可以确定由北大西洋深流驱动的粒子的起源：沉积物供应量的任何变化都反映了深水团体贡献的相对变化。我们的同位素数据集强调了北大西洋深水两个主要成分，即东北大西洋深水（NEADW）和丹麦海峡上溢水（DSOW）在过去12年中的相对贡献的几个主要变化，特别是在全新世晚期。现代深度循环的出现似乎是最近的，发生在最后3年。在冰川/冰川间的时间尺度上，较深的电流变化不太明显，和/或被可变的近端供给部分掩盖了。拉布拉多海的结果强调，在沉积物上使用矿物学和同位素工具可以监测深水流驱动的沉积物供应的变化。这种间接方法进一步有望确定深水流途径并重建过去的环流。

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