The effects of vertical mixing on nonlinear Kelvin waves
The effects of vertical mixing on nonlinear Kelvin waves
复制标题
垂直混合对非线性开尔文波的影响
DOI：
10.1017/jfm.2020.654
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发表时间：
2020
影响因子：
3.7
通讯作者：
Crowe M
中科院分区：
文献类型：
--
作者：
Crowe M
沿海岸边界的亚中尺度过程为海洋中尺度动能耗散提供了一种潜在的机制。由于这些过程发生在全球海洋模式通常无法解决的尺度上，因此需要一种物理驱动的参数化来准确描述它们的影响。亚中尺度动力学具有强湍流混合、非线性和地形效应的特点；所有这些都显著地改变了流程。对中尺度强迫的亚中尺度边界响应的一个主要组成部分是开尔文波场，即海岸捕获波场，它已被证明可以远距离传输能量。因此，本文考察了垂直混合、非线性和陡坡地形对斜压开尔文波的影响，目的是评估这些影响的重要性。我们考虑了陡岸边界、弱混合和弱非线性的极限，并进行了渐近分析，以确定这些影响对经典开尔文波解的修正。给出了线性解和非线性解，讨论了不同的混合极限，并与前人的工作进行了比较。我们发现垂直混合对缓慢传播的开尔文波起阻尼作用，而非线性会引起波破碎，这对于快速波来说可能很重要。与以往的研究一致，陡坡地形改变了波速和结构。
Submesoscale processes along coastal boundaries provide a potential mechanism for the dissipation of mesoscale kinetic energy in the ocean. Since these processes occur on scales not generally resolved by global ocean models, a physically motivated parametrisation is required to accurately describe their effects. Submesoscale dynamics is characterised by strong turbulent mixing, nonlinearity and topographic effects; all of which significantly modify the flow. A major component of the submesoscale boundary response to mesoscale forcing is the Kelvin – or coastally trapped – wave field, which has been shown to transport energy over large distances. This paper thus examines the influence of vertical mixing, nonlinearity and steep-slope topography on baroclinic Kelvin waves with the aim of assessing the importance of these effects. We consider the limit of a steep coastal boundary, weak mixing and weak nonlinearity and perform an asymptotic analysis to determine the modification of the classical Kelvin wave solution by these effects. Linear and nonlinear solutions are given and different mixing limits are discussed and compared with previous work. We find that vertical mixing acts to damp slowly propagating Kelvin waves while nonlinearity can cause wave breaking which may be important for fast waves. Steep-slope topography acts to modify the wave speed and structure consistent with previous work.
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影响因子：
3.7
作者：
M. Crowe;John R. Taylor
通讯作者：
John R. Taylor
摩擦力和地形对低纬度沿海开尔文内波的影响
DOI：
--
发表时间：
1984
期刊：
影响因子：
--
作者：
R. Romea;J. Allen
通讯作者：
J. Allen
非线性赤道开尔文波
DOI：
--
发表时间：
1980
期刊：
影响因子：
--
作者：
J. Boyd
通讯作者：
J. Boyd
影响因子：
2.3
作者：
Johnson E
通讯作者：
Johnson E
影响因子：
3.5
作者：
Poulsen M
通讯作者：
Poulsen M