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On the Relationship between Southern Ocean Overturning and ACC Transport

机译：南大洋倾覆与ACC运输的关系

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摘要

The eddy field in the Southern Ocean offsets the impact of strengthening winds on the meridional overturning circulation and Antarctic Circumpolar Current (ACC) transport. There is widespread belief that the sensitivities of the overturning and ACC transport are dynamically linked, with limitation of the ACC transport response implying limitation of the overturning response. Here, an idealized numerical model is employed to investigate the response of the large-scale circulation in the Southern Ocean to wind stress perturbations at eddy-permitting to eddy-resolving scales. Significant differences are observed between the sensitivities and the resolution dependence of the overturning and ACC transport, indicating that they are controlled by distinct dynamical mechanisms. The modeled overturning is significantly more sensitive to change than the ACC transport, with the possible implication that the Southern Ocean overturning may increase in response to future wind stress changes without measurable changes in the ACC transport. It is hypothesized that the dynamical distinction between the zonal and meridional transport sensitivities is derived from the depth dependence of the extent of cancellation between the Ekman and eddy-induced transports.
机译：南大洋的涡流场抵消了强风对子午翻转环流和南极绕极流（ACC）输送的影响。人们普遍认为，倾覆和ACC传输的敏感性是动态关联的，而ACC传输响应的限制意味着倾覆响应的限制。在这里，采用理想化的数值模型来研究南洋大尺度环流在允许涡流至分辨涡旋尺度下对风应力扰动的响应。倾覆和ACC传输的敏感性和分辨率依赖性之间存在显着差异，表明它们是受不同动力学机制控制的。与ACC输运相比，模型化的倾覆对变化的敏感性要高得多，这可能暗示南洋倾覆可能会响应未来的风应力变化而增加，而ACC输运没有可测量的变化。据推测，纬向和经向输运敏感性之间的动态区别是由埃克曼和涡流引起的输运之间的抵消程度的深度相关性得出的。

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    《Journal of Physical Oceanography》 |2013年第1期|140-148|共9页
  • 作者

    Adele K. Morrison; rew McC. Hogg;

  • 作者单位

    Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia Australian National University, Canberra, Australian Capital Territory, Australia;

    Research School of Earth Sciences, and ARC Centre of Excellence for Climate System Science,Australian National University, Canberra, Australian Capital Territory, Australia;

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