Propagation of Meridional Circulation Anomalies along Western and Eastern Boundaries
Propagation of Meridional Circulation Anomalies along Western and Eastern Boundaries
复制标题
经向环流异常沿西部和东部边界的传播
DOI：
10.1175/jpo-d-13-0134.1
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发表时间：
2013
影响因子：
3.5
通讯作者：
Marshall D
中科院分区：
文献类型：
--
作者：
Marshall D
出于调整的纬向翻转环流的本地化强迫，解决方案是从一个简化的重力模型波的传播沿着西部和东部边界。对于超过几个月的波周期，开尔文波不起作用。相反，传播发生在西部和东部边界，分别通过短和长Rossby波：这些Rossby波传播带状，如经典理论预测的，和气旋沿着盆地边界，以满足非正常流动边界条件。沿边界的传播速度为cLd/δ，其中cLd/δ为重力/Kelvin内波速，Ld为Rossby变形半径，δ为合适的摩擦边界层宽度。这一结果适用于宽范围的参数制度，无论是线性摩擦或横向粘度和无滑移边界条件。对于当代海洋气候模式的典型参数，传播速度恰好接近开尔文波速。在弱耗散极限下，西边界波在向赤道传播时几乎耗散了所有能量，与耗散系数无关。相反，几乎没有能量耗散在东部边界波。背景平均流量的重要性也进行了讨论。
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 iscLd/δ, wherecis the internal gravity/Kelvin wave speed,Ldis the Rossby deformation radius, andδis 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 toward 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.
影响因子：
5.2
作者：
D. Marshall;B. Vogel;Xiaoming Zhai
通讯作者：
D. Marshall;B. Vogel;Xiaoming Zhai