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Propagation of Meridional Circulation Anomalies along Western and Eastern Boundaries

机译：子午环流异常沿西部和东部边界的传播

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摘要

Motivated by the adjustment of the meridional overturning circulation to localized forcing, solutions are presented from a reduced-gravity model for the propagation of waves along western and eastern boundaries. For wave periods exceeding a few months, Kelvin waves play no role. Instead, propagation occurs through short and long Rossby waves at the western and eastern boundaries, respectively: these Rossby waves propagate zonally, as predicted by classical theory, and cyclonically along the basin boundaries to satisfy the no-normal flow boundary condition. The along-boundary propagation speed is cL_d/δ, where c is the internal gravity/Kelvin wave speed, L_d is the Rossby deformation radius, and S is the appropriate frictional boundary layer width. This result holds across a wide range of parameter regimes, with either linear friction or lateral viscosity and a no-slip boundary condition. For parameters typical of contemporary ocean climate models, the propagation speed is coincidentally close to the Kelvin wave speed. In the limit of weak dissipation, the western boundary wave dissipates virtually all of its energy as it propagates to ward the equator, independent of the dissipation coefficient. In contrast, virtually no energy is dissipated in the eastern boundary wave. The importance of background mean flows is also discussed.
机译：通过将子午向翻转环流调整为局部强迫，从减小重力模型中提出了沿西边界和东边界传播波的解决方案。对于超过几个月的波浪周期，开尔文波浪不起作用。取而代之的是，传播通过西边和东边的长和短Rossby波发生：这些Rossby波按照经典理论的预测分别向区域性传播，并沿着盆地边界旋回，以满足非正常流动边界条件。沿边界的传播速度为cL_d /δ，其中c为内部重力/开尔文波速，L_d为Rossby变形半径，S为适当的摩擦边界层宽度。该结果在线性摩擦或侧向粘度以及无滑移边界条件的情况下，适用于各种参数范围。对于当代海洋气候模型的典型参数，传播速度恰好接近开尔文波速。在弱耗散的极限内，西方边界波在传播到赤道时几乎消散了所有能量，而与耗散系数无关。相反，在东部边界波中几乎没有能量消散。还讨论了背景均值流量的重要性。

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  • 来源
    《Journal of Physical Oceanography》 |2013年第12期|2699-2717|共19页
  • 作者

    David P. Marshall; Helen L. Johnson;

  • 作者单位

    Clarendon Laboratory, Department ot Physics, Parks Road, University ot Oxford, Oxford OX1 3PU, United Kingdom;

    Department of Earth Sciences, University of Oxford, Oxford, United Kingdom;

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