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An Idealized Model of Weddell Gyre Export Variability

机译：Weddell Gyre出口波动性的理想模型

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摘要

Recent observations suggest that the export of Antarctic Bottom Water (AABW) from the Weddell Sea has a seasonal cycle in its temperature and salinity that is correlated with annual wind stress variations. This variability has been attributed to annual vertical excursions of the isopycnals in the Weddell Gyre, modifying the water properties at the depth of the Orkney Passage. Recent studies attribute these variations to locally wind-driven barotropic dynamics in the northern Weddell Sea boundary current. This paper explores an alternative mechanism in which the isopycnals respond directly to surface Ekman pumping, which is coupled to rapidly responding mesoscale eddy buoyancy fluxes near the gyre boundary. A conceptual model of the interface that separates Weddell Sea Deep Water from Circumpolar Deep Water is described in which the bounding isopycnal responds to a seasonal oscillation in the surface wind stress. Different parameterizations of the mesoscale eddy diffusivity are tested. The model accurately predicts the observed phases of the temperature and salinity variability in relationship to the surface wind stress. The model, despite its heavy idealization, also accounts for more than 50% of the observed oscillation amplitude, which depends on the strength of the seasonal wind variability and the parameterized eddy diffusivity. These results highlight the importance of mesoscale eddies in modulating the export of AABW in narrow boundary layers around the Antarctic margins.
机译：最近的观察表明，从韦德尔海出口的南极底水（AABW）的温度和盐度具有季节性周期，与年度风应力变化相关。这种变化归因于韦德尔涡旋中等位面的年度垂直偏移，从而改变了奥克尼通道深度的水质。最近的研究将这些变化归因于韦德海北部边界流中的局部风动力正压动力。本文探讨了一种替代机制，其中等高线直接响应表面Ekman抽运，这与旋回边界附近的中尺度涡旋浮力通量快速响应。描述了将韦德海深水与极地深水区分开的界面的概念模型，在该模型中，有界的等温线响应表面风应力中的季节性振荡。测试了中尺度涡流扩散率的不同参数。该模型可准确预测与表面风应力有关的温度和盐度变化的观测阶段。该模型尽管理想化程度很高，但也占观察到的振荡幅度的50％以上，这取决于季节性风变率的强度和参数化的涡流扩散率。这些结果突出了中尺度涡旋在调节南极边缘周围狭窄边界层中的AABW出口方面的重要性。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第6期|1671-1688|共18页
  • 作者

    Zhan Su; Andrew L. Stewart; Andrew F. Thompson;

  • 作者单位

    Division of Geological and Planetary Sciences, California Institute of Technology, 1200 East California Blvd., Pasadena, CA 91125;

    Environmental Science and Engineering, California Institute of Technology, Pasadena, California;

    Environmental Science and Engineering, California Institute of Technology, Pasadena, California;

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