An abrupt shift in the Labrador Current System in relation to winter NAO events
An abrupt shift in the Labrador Current System in relation to winter NAO events
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DOI：
10.1002/2016jc011721
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发表时间：
2016-07
影响因子：
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通讯作者：
Zeliang Wang;D. Brickman;B. Greenan;I. Yashayaev
中科院分区：
文献类型：
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作者：
Zeliang Wang;D. Brickman;B. Greenan;I. Yashayaev
利用涡分辨环流模式研究了1990 - 2007年北大西洋拉布拉多海流的行为。对模型输出的一项分析表明，拉布拉多海流的变异性可分为西部拉布拉多海流（WLC;从300-2500米等深线）和东部拉布拉多海流（ELC;从2500-3300米等深线）。模型结果表明，WLC运输经历了一个突然增加，在2000-2002年，与数据一致。这显着不同的ELC运输是强大的冬季NAO（北大西洋涛动）年（1990-95），然后稳步下降。ELC趋势与模拟的大西洋经向翻转环流和对流深度的变化一致。我们的研究表明，在WLC的变化是由于在2001年开始的大气环流模式的西南移动，在2001年NAO指数的变化一致，也在冬季NAO事件的行动中心的向西移。本文受版权保护。All rights reserved.
The behavior of the Labrador Current during the period from 1990 to 2007 is investigated with an eddy-resolving circulation model for the North Atlantic Ocean. An EOF analysis of the model output suggests that the variability in the Labrador Current can be partitioned into a western Labrador Current (WLC; from the 300-2500 m isobaths), and an eastern Labrador Current (ELC; from the 2500-3300 m isobaths). The model results demonstrate that the WLC transport experienced an abrupt increase during 2000-2002, consistent with data. This differed significantly from the ELC transport which was strong during the high winter NAO (North Atlantic Oscillation) years (1990-95) and then steadily declined. This ELC trend is consistent with changes in the modelled Atlantic Meridional Overturning Circulation and convection depth. Our study proposes that the change in the WLC is due to a southwestward shift of the atmospheric circulation pattern starting in 2001, coincident with a change in the 2001 NAO index, and also in a westward shift of the action centers of the winter NAO events. This article is protected by copyright. All rights reserved.