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首页> 外文期刊>Journal of Physical Oceanography >Connecting Antarctic Cross-Slope Exchange with Southern Ocean Overturning
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Connecting Antarctic Cross-Slope Exchange with Southern Ocean Overturning

机译：连接南极横坡交换和南大洋倾覆

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摘要

Previous idealized investigations of Southern Ocean overturning have omitted its connection with the Antarctic continental shelves, leaving the influence of shelf processes on Antarctic Bottom Water (AABW) export unconsidered. In particular, the contribution of mesoscale eddies to setting the stratification and overturning circulation in the Antarctic Circumpolar Current (ACC) is well established, yet their role in cross-shelf exchange of water masses remains unclear. This study proposes a residual-mean theory that elucidates the connection between Antarctic cross-shelf exchange and overturning in the ACC, and the contribution of mesoscale eddies to the export of AABW. The authors motivate and verify this theory using an eddy-resolving process model of a sector of the Southern Ocean. The strength and pattern of the simulated overturning circulation strongly resemble those of the real ocean and are closely captured by the residual-mean theory. Over the continental slope baroclinic instability is suppressed, and so transport by mesoscale eddies is reduced. This suppression of the eddy fluxes also gives rise to the steep "V"-shaped isopycnals that characterize the Antarctic Slope Front in AABW-forming regions of the continental shelf. Furthermore, to produce water on the continental shelf that is dense enough to sink to the deep ocean, the deep overturning cell must be at least comparable in strength to wind-driven mean overturning on the continental slope. This results in a strong sensitivity of the deep overturning strength to changes in the polar easterly winds.
机译：先前对南大洋倾覆进行的理想化研究已经忽略了其与南极大陆架的联系，从而没有考虑到搁架过程对南极底水（AABW）出口的影响。特别是，中尺度涡旋对确定南极洲极地洋流（ACC）的分层和翻转环流的贡献已得到充分证实，但是它们在跨层交换水团中的作用仍不清楚。这项研究提出了一种残差均值理论，阐明了南极洲跨架交换和ACC倾覆之间的联系，以及中尺度涡流对AABW出口的贡献。作者使用南大洋地区的涡旋分解过程模型来激发和验证这一理论。模拟的倾覆环流的强度和样式与真实海洋的强度和样式非常相似，并被残差均值理论所精确捕获。在大陆坡上，斜压不稳定被抑制，因此中尺度涡流的运输减少了。对涡流的这种抑制也引起了陡峭的“ V”形等渗线，这些特征线代表了大陆架AABW形成区域中的南极斜坡锋。此外，为了在密度足以沉入深海的大陆架上生产水，深层倾覆单元的强度必须至少与大陆坡上的风驱动平均倾覆相当。这导致强烈的倾覆强度对极地东风的变化非常敏感。

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  • 来源
    《Journal of Physical Oceanography》 |2013年第7期|1453-1471|共19页
  • 作者

    Andrew L. Stewart; Andrew F. Thompson;

  • 作者单位

    Environmental Science and Engineering, MC 131-24, California Institute of Technology, Pasadena, CA 91125;

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

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  • 正文语种 eng
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