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Standing Eddies in the Meridional Overturning Circulation

机译：经络翻转循环中的常涡

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摘要

The role of standing eddies for the meridional overturning circulation (MOC) is discussed. The time-mean isopycnal meridional streamfunction is decomposed into a time- and zonal-mean part, a standing-eddy part, and a transient-eddy part. It turns out that the construction of an isopycnal MOC with an exactly vanishing standing-eddy part has to be performed by zonal integration along depth-dependent horizontal isolines of time-mean density. In contrast, zonal integration along time-mean geostrophic streamlines generally only leads to an isopycnal MOC with a reduced standing-eddy part. A generalized approach of constructing meridional transport streamfunctions by two tracer fields and the generalized way to neutralize the corresponding standing-eddy part is given to summarize the discussion. Using the results of an idealized Southern Ocean model, it is demonstrated that neglecting the depth dependence of the zonal integration paths by integrating along density contours or geostrophic streamlines of a fixed depth ("contour depth") may represent an acceptable approximation: although the standing-eddy part then exactly vanishes only at the contour depth (except for the ageostrophic surface layer using geostrophic streamlines), the overall standing-eddy part is significantly reduced for adequate contour depths. In the idealized Southern Ocean model, density contours at middepth and surface geostrophic streamlines represent the most adequate approximations. Moreover, it is found that the effect of changing the zonal integration paths from latitude circles to curvilinear paths on the zonally averaged density is of the same order as changing from Eulerian to isopycnal averaging.
机译：讨论了站立涡在子午翻转循环（MOC）中的作用。时间平均等渗子午流函数分解为时间平均和纬向平均部分，站立涡流部分和瞬态涡流部分。结果表明，具有均匀消失的涡旋部分的等渗MOC的构建必须通过沿时均密度的深度相关水平等值线的区域积分进行。相比之下，沿时间平均地转流线的区域整合通常只会导致等静角MOC的站立涡流部分减少。给出了通过两个示踪场构造经向输运流函数的通用方法以及中和相应的站立涡流部分的通用方法，以总结讨论。使用理想化的南方海洋模型的结果，可以证明，通过沿密度等高线或固定深度（“等高线深度”）的地转流线进行积分而忽略了纬向积分路径的深度依赖性可能是可以接受的近似值：然后，涡流部分仅在轮廓深度处完全消失（除了使用地转流线的变质表面层），对于足够的轮廓深度，整体站立涡流部分将显着减少。在理想化的南大洋模式中，中深度和地转流线的密度等值线是最合适的近似值。此外，已发现将纬度积分路径从纬度圆更改为曲线路径对区域平均密度的影响与从欧拉平均更改为等渗平均的影响相同。

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  • 来源
    《Journal of Physical Oceanography》 |2012年第9期|p.1486-1508|共23页
  • 作者

    Jan Viebahn; Carsten Eden;

  • 作者单位

    KlimaCampus, University of Hamburg, Hamburg, Germany;

    KlimaCampus, University of Hamburg, Hamburg, Germany;

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  • 正文语种 eng
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