Deciphering the pathways for the deep limb of the Meridional Overturning Circulation
Deciphering the pathways for the deep limb of the Meridional Overturning Circulation
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DOI：
10.1016/j.dsr2.2010.10.059
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发表时间：
2011-09-01
影响因子：
3
通讯作者：
Biastoch, Arne
中科院分区：
文献类型：
--
作者：
Gary, Stefan F.;Lozier, M. Susan;Biastoch, Arne
在过去的50年里，人们一直认为大西洋经向翻转环流（AMOC）深翼的主要通道是深部西部边界流（DWBC）。然而，最近对拉格朗日浮标的观测表明，对于这些深水沃茨，DWBC不一定是唯一的、占主导地位的或连续的路径。从副极地到亚热带环流的深水输出的很大一部分是沿着纽芬兰和亚热带盆地内部的路径进行的，这一路径受到大西洋中脊西部边界和西侧的限制。深涡驱动的再循环环流的假设是一种机制，分区的深层肢体的AMOC到DWBC和内部途径进行了研究。使用欧拉和拉格朗日分析对涡旋分辨率、涡旋允许和非涡旋允许分辨率的海洋环流模型输出进行了检验这一假设。涡驱动的再循环环流，模拟的涡分辨和涡允许的模型和类似的再循环推断水文数据，形状的出口路径的深水从副极地到副热带环流。(C)2011爱思唯尔有限公司保留所有权利。
For the past 50 years it has been assumed that the principal pathway for the deep limb of the Atlantic Meridional Overturning Circulation (AMOC) is the Deep Western Boundary Current (DWBC). However, recent observations of Lagrangian floats have shown that the DWBC is not necessarily a unique, dominant, or continuous pathway for these deep waters. A significant portion of the deep water export from the subpolar to the subtropical gyres follows a pathway through the interior of the Newfoundland and subtropical basins, which is constrained by the western boundary and the western flank of the Mid-Atlantic Ridge. The hypothesis that deep eddy-driven recirculation gyres are a mechanism for partitioning the deep limb of the AMOC into the DWBC and this interior pathway is investigated here. Eulerian and Lagrangian analyses of the output of ocean general circulation models at eddy-resolving, eddy-permitting, and non-eddy permitting resolutions are used to test this hypothesis. Eddy-driven recirculation gyres, simulated in the eddy-resolving and eddy-permitting models and similar to recirculations inferred from hydrographic data, are shown to shape the export pathways of deep water from the subpolar to the subtropical gyres. (C) 2011 Elsevier Ltd. All rights reserved.