Large near-inertial oscillations of the Atlantic meridional overturning circulation
Large near-inertial oscillations of the Atlantic meridional overturning circulation
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DOI：
10.1016/j.ocemod.2011.11.008
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发表时间：
2012-01-01
期刊：
影响因子：
3.2
通讯作者：
Madec, Gurvan
中科院分区：
文献类型：
--
作者：
Blaker, Adam T.;Hirschi, Joel J-M.;Madec, Gurvan
大西洋经向翻转环流（AMOC）是欧洲温和气候的关键成因。观测和模型均表明，AMOC的强度在很宽的时间尺度上变化。在此，我们展示了在一个高分辨率海洋模型中存在此前未报道的大幅近惯性AMOC振荡。这些振荡的峰 - 峰值在一天内可超过50斯维尔德鲁普（50×10⁶立方米/秒）。AMOC振荡是由向赤道传播的近惯性重力波（NIGWs）引起的，而这些波是由随时间变化的风应力激发的。海洋中存在近惯性重力波得到了观测的支持，并且海洋动能的很大一部分与近惯性频率有关。我们的研究结果还表明，由近惯性重力波驱动的大洋环流（MOC）变率对于当代的AMOC观测系统（如北纬26.5度的RAPID MOC系统）来说几乎是不可见的。英国皇家版权所有（C）2011，由爱思唯尔有限公司出版。保留所有权利。
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.