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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Sea-ice control on deglacial lower cell circulation changes recorded by Drake Passage deep-sea corals
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Sea-ice control on deglacial lower cell circulation changes recorded by Drake Passage deep-sea corals

机译：德雷克通道深海珊瑚记录的下闪透下细胞循环变化的海冰控制

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The sequence of deep ocean circulation changes between the Last Glacial Maximum and the Holocene provides important insights for understanding deglacial climate change and the role of the deep ocean in the global carbon cycle. Although it is known that significant amounts of carbon were sequestered in a deep overturning cell during glacial periods and released during deglaciation, the driving mechanisms for these changes remain unresolved. Southern Ocean sea-ice has recently been proposed to play a critical role in setting the global deep ocean stratification and circulation, and hence carbon storage, but testing such conceptual and modelling studies requires data constraining past circulation changes. To this end, we present the first deglacial dataset of neodymium (Nd) isotopes measured on absolute-dated deep-sea corals from modern Lower Circumpolar Deep Water depths in the Drake Passage. Our record demonstrates deglacial variability of 2.5 epsilon(Nd )units, with radiogenic values of up to epsilon(Nd) = -5.9 during the Last Glacial Maximum providing evidence for a stratified glacial circulation mode with restricted incorporation of Nd from North Atlantic Deep Water in the lower cell. During the deglaciation, a renewed Atlantic influence in the deep Southern Ocean is recorded early in Heinrich Stadial 1, coincident with Antarctic sea-ice retreat, and is followed by a brief return to more Pacific-like values during the Antarctic Cold Reversal. These changes demonstrate a strong influence of Southern Ocean processes in setting deep ocean circulation and support the proposed sea-ice control on deep ocean structure. Furthermore, by constraining the Nd isotopic composition of Lower Circumpolar Deep Water in the Southern Ocean, our new data are important for interpreting deglacial circulation changes in other ocean basins and support a spatially asynchronous return of North Atlantic Deep Water to the deep southeast and southwest Atlantic Ocean. (C) 2020 Elsevier B.V. All rights reserved.
机译：的末次盛冰期和全新世深之间的海洋环流的变化顺序为了解冰消期气候变化和深海的在全球碳循环中的作用的重要见解。虽然已知显著的碳均在冰期在深倾覆细胞隔离和次冰消期释放，这些变化的驱动机制仍然没有得到解决。南大洋海冰最近提出了制定全球深海分层和流通，因此碳储存，但测试这样的概念和模型研究中发挥关键作用，需要数据制约过去环流的变化。为此，我们提出钕的第一冰消数据集（ND）同位素对从德雷克海峡现代较低的绕极深层水的深度绝对过时的深海珊瑚测量。我们的记录与来自北大西洋深水钕的限制纳入一个分层的冰川循环模式的末次盛冰期提供证据证明在2.5小量的冰消变异（Nd）的单位，最多可小量（ND）= -5.9的放射值较低的细胞。在冰消期，在深南大洋重新大西洋影响在海因里希于冰阶1，与南极海冰退却重合早期记录，并随后简要介绍重返亚太更多类似南极冷逆转过程中的值。这些变化表明南大洋进程的强大的影响力在制定深海洋环流和支持深海结构所提出的海冰控制。此外，通过约束下绕极深层水的Nd同位素组成在南大洋，我们的新数据是用于解释在其他大洋盆地冰消环流变化的重要支持北大西洋深层水的深东南和西南大西洋空间的异步回海洋。 （c）2020 Elsevier B.v.保留所有权利。

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