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Dynamics of North Atlantic Deep Water masses during the Holocene

机译：全新世期间北大西洋深水团的动力学

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摘要

High resolution flow speed reconstructions of two core sites located on Gardar Drift in the northeast Atlantic Basin and Orphan Knoll in the northwest Atlantic Basin reveal a long-term decrease in flow speed of Northeast Atlantic Deep Water (NEADW) after 6,500 years. Benthic foraminiferal oxygen isotopes of sites currently bathed in NEADW show a 0.2% depletion after 6,500 years, shortly after the start of the development of a carbon isotope gradient between NEADW and Norwegian Sea Deep Water. We consider these changes in near-bottom flow vigor and benthic foraminiferal isotope records to mark a significant reorganization of the Holocene deep ocean circulation, and attribute the changes to a weakening of NEADW flow during the mid to late Holocene that allowed the shoaling of Lower Deep Water and deeper eastward advection of Labrador Sea Water into the northeast Atlantic Basin.
机译：对位于东北大西洋盆地Gardar Drift和西北大西洋盆地Orphan Knoll上两个核心站点的高分辨率流速重建显示，在6,500年后，东北大西洋深水（NEADW）的流速长期下降。在NEADW和挪威海深水之间碳同位素梯度开始发展后不久，在NEADW中沐浴的底栖有孔虫氧同位素在6,500年后显示0.2％的消耗。我们认为近地底流动活力和底栖有孔虫同位素记录中的这些变化标志着全新世深海环流的重大重组，并将这些变化归因于全新世中晚期的NEADW流量减弱，从而允许了低层深部的浅滩水和拉布拉多海水向东北大西洋盆地的更深的东平流。

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