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Temporal stability of the neodymium isotope signature of the Holocene to glacial North Atlantic

机译：全新世到冰川北大西洋的钕同位素标记的时间稳定性

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+AFs- 1+AF0- The neodymium isotopic composition of marine precipitates is increasingly recognized as a powerful tool for identifying changes in ocean circulation and mixing on million year to millennial timescales. Unlike nutrient proxies such as delta C-13 or Cd/Ca, Nd isotopes are not thought to be altered in any significant way by biological processes, and thus they can serve as a quasi-conservative water mass tracer. However, the application of Nd isotopes in understanding the role of thermohaline circulation in rapid climate change is currently hindered by the lack of direct constraints on the signature of the North Atlantic end-member through time. Here we present the first results of Nd isotopes measured in U-Th-dated deep-sea corals from the New England seamounts in the northwest Atlantic Ocean. Our data are consistent with the conclusion that the Nd isotopic composition of North Atlantic deep and intermediate water has remained nearly constant through the last glacial cycle. The results address long-standing concerns that there may have been significant changes in the Nd isotopic composition of the North Atlantic end-member during this interval and substantiate the applicability of this novel tracer on millennial timescales for paleoceanography research.
机译：+ AFs-1 + AF0-海洋沉淀物的钕同位素组成越来越被认为是确定海洋环流变化和百万年至千禧年尺度混合的有力工具。与营养素代理（例如C-13或Cd / Ca）不同，Nd同位素不会被生物过程以任何显着方式改变，因此它们可以用作准保守水质示踪剂。但是，目前Nd同位素在了解热盐循环在快速气候变化中的作用方面的应用目前由于缺乏对北大西洋末端成员随时间推移的特征缺乏直接限制而受到阻碍。在这里，我们介绍了在西北大西洋新英格兰海山的U-Th型深海珊瑚中测量到的Nd同位素的初步结果。我们的数据与以下结论一致：北大西洋深水和中层水的Nd同位素组成在上一个冰川周期中几乎保持恒定。该结果解决了长期存在的担忧，即在此间隔期间北大西洋末端成员的Nd同位素组成可能发生了重大变化，并证实了这种新型示踪剂在千年古时尺度上用于古海洋学研究的适用性。

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