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首页> 外文期刊>Journal of Physical Oceanography >Response of North Atlantic Ocean Circulation to Atmospheric Weather Regimes
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Response of North Atlantic Ocean Circulation to Atmospheric Weather Regimes

机译：北大西洋环流对大气天气状况的响应

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摘要

A new framework is proposed for investigating the atmospheric forcing of North Atlantic Ocean circulation. Instead of using classical modes of variability, such as the North Atlantic Oscillation (NAO) or the east Atlantic pattern, the weather regimes paradigm was used. Using this framework helped avoid problems associated with the assumptions of orthogonality and symmetry that are particular to modal analysis and known to be unsuitable for the NAO. Using ocean-only historical and sensitivity experiments, the impacts of the four winter weather regimes on horizontal and overturning circulations were investigated. The results suggest that the Atlantic Ridge (AR), negative NAO (NAO~-), and positive NAO (NAO~+) regimes induce a fast (monthly-to-interannual time scales) adjustment of the gyres via topographic Sverdrup dynamics and of the meridional overturning circulation via anomalous Ekman transport. The wind anomalies associated with the Scandinavian blocking regime (SBL) are ineffective in driving a fast wind-driven oceanic adjustment. The response of both gyre and overturning circulations to persistent regime conditions was also estimated. AR causes a strong, wind-driven reduction in the strengths of the subtropical and subpolar gyres, while NAO~+ causes a strengthening of the subtropical gyre via wind stress curl anomalies and of the subpolar gyre via heat flux anomalies. NAO~- induces a southward shift of the gyres through the southward displacement of the wind stress curl. The SBL is found to impact the subpolar gyre only via anomalous heat fluxes. The overturning circulation is shown to spin up following persistent SBL and NAO~+ and to spin down following persistent AR and NAO~- conditions. These responses are driven by changes in deep water formation in the Labrador Sea.
机译：提出了一个用于研究北大西洋环流大气强迫的新框架。代替使用传统的可变性模式，例如北大西洋涛动（NAO）或东大西洋模式，使用天气模式范式。使用此框架有助于避免与正交性和对称性假设相关的问题，这些问题是模态分析所特有的，并且不适合NAO。使用仅海洋的历史和敏感性实验，研究了四种冬季天气状况对水平和倾覆环流的影响。结果表明，大西洋脊（AR），负NAO（NAO〜-）和正NAO（NAO〜+）方案会通过地形Sverdrup动力学和地形动力学快速（每月至年际）调整回旋。通过异常埃克曼输运的经向翻转环流。与斯堪的纳维亚阻塞机制（SBL）相关的风异常在推动快速的风驱动海洋调整方面无效。还估计了回旋和倾覆环流对持续状态的响应。 AR引起了亚热带和亚极地回旋强度的强烈的风动力减弱，而NAO〜+则通过风应力卷曲异常导致了亚热带回旋强度的增强，而热通量异常则导致了亚极回旋强度的增强。 NAO〜-通过风向应力弯曲的南移引起回旋的南移。发现SBL仅通过异常热通量影响亚极回旋。倾覆环流在持续的SBL和NAO〜+之后上升，而在持续的AR和NAO〜-条件下下降。这些反应是由拉布拉多海深水形成的变化驱动的。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第1期|179-201|共23页
  • 作者

    Nicolas Barrier; Christophe Cassou; Julie Deshayes; Anne-Marie Treguier;

  • 作者单位

    Laboratoire de Physique des Oceans, UMR 6523, CNRS/Ifremer/UBO/IRD, Brest, France LPO, UMR 6523, CNRS/Ifremer/UBO/IRD, Pointe du Diable, 29280 Plouzane, France;

    CNRS Cerfacs, Toulouse, France;

    Laboratoire de Physique des Oceans, UMR 6523, CNRS/Ifremer/UBO/IRD, Brest, France;

    Laboratoire de Physique des Oceans, UMR 6523, CNRS/Ifremer/UBO/IRD, Brest, France;

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