How Does Labrador Sea Water Enter the Deep Western Boundary Current
How Does Labrador Sea Water Enter the Deep Western Boundary Current
复制标题
拉布拉多海水如何进入西部深边界流
DOI：
10.1175/2007jpo3807.1
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发表时间：
2008
影响因子：
3.5
通讯作者：
Kara L. Lavender
中科院分区：
文献类型：
--
作者：
J. Palter;M. Lozier;Kara L. Lavender
拉布拉多海水（Labrador Sea Water， LSW）是北大西洋次极区对流形成的致密水团，是经向翻转环流的重要组成部分。了解水团如何进入深西部边界流（DWBC），这是它退出亚极环流的主要途径之一，可以揭示形成区气候条件及其下游信号之间的连续性。利用1996年至2002年间运行的自主拉格朗日环流探测器(P)ALACE)浮标的轨迹，对拉布拉多海水进入DWBC的三个过程进行了评估：1)LSW直接在DWBC形成，2)涡旋从拉布拉多海内部向DWBC输送LSW，以及3)LSW从内部向DWBC输送水平分散的平均流。对与这三种机制相关的热通量的比较表明，这三种机制都有助于边界电流的转换。
Abstract Labrador Sea Water (LSW), a dense water mass formed by convection in the subpolar North Atlantic, is an important constituent of the meridional overturning circulation. Understanding how the water mass enters the deep western boundary current (DWBC), one of the primary pathways by which it exits the subpolar gyre, can shed light on the continuity between climate conditions in the formation region and their downstream signal. Using the trajectories of (profiling) autonomous Lagrangian circulation explorer [(P)ALACE] floats, operating between 1996 and 2002, three processes are evaluated for their role in the entry of Labrador Sea Water in the DWBC: 1) LSW is formed directly in the DWBC, 2) eddies flux LSW laterally from the interior Labrador Sea to the DWBC, and 3) a horizontally divergent mean flow advects LSW from the interior to the DWBC. A comparison of the heat flux associated with each of these three mechanisms suggests that all three contribute to the transformation of the boundary current a...