Overflow water pathways in the North Atlantic
Overflow water pathways in the North Atlantic
复制标题
北大西洋的溢流水道
DOI：
10.1016/j.pocean.2022.102874
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发表时间：
2022
影响因子：
4.1
通讯作者：
Zou, Sijia
中科院分区：
文献类型：
--
作者：
Susan Lozier, M.;Bower, Amy S.;Furey, Heather H.;Drouin, Kimberley L.;Xu, Xiaobiao;Zou, Sijia
作为国际次极地北大西洋翻转计划（OSNAP）的一部分，从2014年到2018年，部署了135个声学跟踪深浮子来跟踪冰岛-苏格兰溢出水（ISAW）和丹麦海峡溢出水（DSOW）的传播路径。这些水团起源于北欧海，由大西洋经向翻转环流（AMOC）最深的分支输送。OSNAP浮标提供了第一个直接观察到的，全面的ISAW和DSOW在整个亚极地北大西洋传播路径的拉格朗日视图。OSNAP浮标轨迹的收集，补充模型模拟，揭示了他们的路径是（a）不限于西部边界电流，（B）显着不同的彼此的性格。DSOW从Irminger海的传播主要是通过Irminger海和拉布拉多海的快速深层边界流，而ISAW从冰岛盆地的传播速度较慢，沿着多个出口途径。这些溢流水途径的表征对我们理解AMOC及其变异性具有重要意义。最后，重建AMOC的变化从代理数据，涉及的强度边界电流和/或深沃茨的属性变化，应占无数的途径DSOW和ISOW，但尤其是后者。
As part of the international Overturning in the Subpolar North Atlantic Program (OSNAP), 135 acoustically-tracked deep floats were deployed to track the spreading pathways of Iceland-Scotland Overflow Water (ISOW) and Denmark Strait Overflow Water (DSOW) from 2014 to 2018. These water masses, which originate in the Nordic Seas, are transported by the deepest branch of the Atlantic Meridional Overturning Circulation (AMOC). The OSNAP floats provide the first directly-observed, comprehensive Lagrangian view of ISOW and DSOW spreading pathways throughout the subpolar North Atlantic. The collection of OSNAP float trajectories, complemented by model simulations, reveals that their pathways are (a) not restricted to western boundary currents, and (b) remarkably different from each other in character. The spread of DSOW from the Irminger Sea is primarily via the swift deep boundary currents of the Irminger and Labrador Seas, whereas the spread of ISOW out of the Iceland Basin is slower and along multiple export pathways. The characterization of these Overflow Water pathways has important implications for our understanding of the AMOC and its variability. Finally, reconstructions of AMOC variability from proxy data, involving either the strength of boundary currents and/or the property variability of deep waters, should account for the myriad pathways of DSOW and ISOW, but particularly so for the latter.