Large near-inertial oscillations of the Atlantic meridional overturning circulation

被引：25
作者：
Blaker, Adam T. [1 ]
Hirschi, Joel J-M. [1 ]
Sinha, Bablu [1 ]
de Cuevas, Beverly [1 ]
Alderson, Steven [1 ]
Coward, Andrew [1 ]
Madec, Gurvan [1 ,2 ]
机构：
[1] Univ Southampton, Natl Oceanog Ctr, Southampton SO14 3ZH, Hants, England
[2] LOCEAN CNRS IRD UPMC MNHN Inst Pierre & Simon Lap, Paris, France
来源：
OCEAN MODELLING | 2012年 / 42卷
关键词：
Meridional overturning circulation; High frequency variability; Near inertial gravity waves; Ocean model; GLOBAL OCEAN CIRCULATION; VARIABILITY; ENERGY;
D O I：
10.1016/j.ocemod.2011.11.008
中图分类号：
P4 [大气科学（气象学）];
学科分类号：
0706 ; 070601 ;
摘要：
The Atlantic meridional overturning circulation (AMOC) is a key contributor to Europe's mild climate. Both observations and models suggest that the AMOC strength varies on a wide range of timescales. Here we show the existence of previously unreported large near inertial AMOC oscillations in a high resolution ocean model. Peak-to-peak these oscillations can exceed 50 Sv (50.10(6) m(3) s(-1)) in one day. The AMOC oscillations are caused by equatorward propagating near-inertial gravity waves (NIGWs) which are forced by temporally changing wind forcing. The existence of NIGWs in the ocean is supported by observations, and a significant fraction of the ocean's kinetic energy is associated with the near inertial frequencies. Our results also suggest that the NIGW-driven MOC variability would be near invisible to contemporary AMOC observing systems such as the RAPID MOC system at 26.5 degrees N. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：50 / 56
页数：7
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