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首页> 外文期刊>Journal of Physical Oceanography >Semi-Adiabatic Model of the Deep Stratification and Meridional Overturning
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Semi-Adiabatic Model of the Deep Stratification and Meridional Overturning

机译：深层和子午线倾覆的半绝热模型

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摘要

An analytical model of the Atlantic deep stratification and meridional overturning circulation is presented that illustrates the dynamic coupling between the Southern Ocean and the midlatitude gyres. The model, expressed here in terms of the two-and-a-half-layer framework, predicts the stratification and meridional transport as a function of the mechanical and thermodynamic forcing at the sea surface. The approach is based on the classical elements of large-scale circulation theory—ideal thermocline, inertial western boundary currents, and eddy-controlled Antarctic Circumpolar Current (ACC) models—which are combined to produce a consistent three-dimensional view of the global overturning. The analytical tractability is achieved by assuming and subsequently verifying that the pattern of circulation in the model is largely controlled by adiabatic processes: the time-mean and eddy-induced isopycnal advection of buoyancy. The mean stratification of the lower thermocline is determined by the surface forcing in the ACC and, to a lesser extent, by the North Atlantic Deep Water formation rate. Although the vertical small-scale mixing and the diapycnal eddy-flux components can substantially influence the magnitude of overturning, their effect on the net stratification of the midlatitude ocean is surprisingly limited. The analysis in this paper suggests the interpretation of the ACC as an active lateral boundary layer that does not passively adjust to the prescribed large-scale solution but instead forcefully controls the interior pattern.
机译：提出了大西洋深层分层和子午翻转环流的分析模型，该模型说明了南大洋和中纬回旋之间的动态耦合。该模型在此以两层半框架表示，它根据海面的机械和热力学强迫来预测分层和子午线传输。该方法基于大规模循环理论的经典要素，即理想的跃层，惯性西边界电流和涡流控制的南极绕极流（ACC）模型，这些模型相结合以产生一致的全球倾覆的三维视图。通过假设并随后验证模型中的循环模式在很大程度上受绝热过程控制来实现分析性可预测性：时间平均和涡流引起的等温平流平流。下部温跃层的平均分层取决于ACC中的表面强迫，在较小程度上取决于北大西洋深水形成速率。尽管垂直的小尺度混合和径向涡旋通量分量可以显着影响倾覆的幅度，但它们对中纬度海洋净分层的影响却出乎意料地受到限制。本文中的分析建议将ACC解释为主动的横向边界层，该层不会被动地适应指定的大规模解决方案，而是会强制控制内部模式。

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  • 来源
    《Journal of Physical Oceanography》 |2011年第4期|p.757-780|共24页
  • 作者

    Timour Radko; IGOR KAMENKOVICH;

  • 作者单位

    Department of Oceanography, Naval Postgraduate School, Monterey, California;

    Division of Meteorology and Physical Oceanography, Rosenstiel School of Marine and Atmospheric Science,University of Miami, Miami, Florida;

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