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首页> 外文期刊>Journal of Physical Oceanography >The M-2 Internal Tide Simulated by a 1/10 degrees OGCM
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The M-2 Internal Tide Simulated by a 1/10 degrees OGCM

机译：由1/10度OGCM模拟的M-2内部潮汐

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摘要

Using a concurrent simulation of the ocean general circulation and tides with the 1/10 degrees Max Planck Institute Ocean Model (MPI-OM), known as STORMTIDE, this study provides a near-global quantification of the low-mode M-2 internal tides. The quantification is based on wavelengths and their near-global distributions obtained by applying spectral analysis to STORMTIDE velocities and on comparisons of the distributions with those derived by solving the Sturm-Liouville eigenvalue problem. The simulated wavelengths, with respect to both their magnitudes and their geographical distributions, compare well with those obtained by solving the eigenvalue problem, suggesting that the STORMTIDE internal waves are, to a first approximation, linear internal waves satisfying local dispersion relations. The simulated wavelengths of modes 1 and 2 range within 100-160 and 45-80 km, respectively. Their distributions reveal, to different degrees for both modes, a zonal asymmetry and a tendency of a poleward increase with stratification N and the Coriolis parameter f being responsible for these two features, respectively. Distributions of mode 1 wavelengths are found to be determined by both N and f, but those of mode 2 are mainly controlled by variations in N. Larger differences between the STORMTIDE wavelengths and those of the eigenvalue problem occur, particularly for mode 2, primarily in high-latitude oceans and the Kuroshio and Gulf Stream and their extensions.
机译：通过同时使用1/10度马克斯·普朗克研究所海洋模型（MPI-OM），称为STORMTIDE的海洋总环流和潮汐模拟，本研究为低模M-2内部潮汐提供了近乎全局的量化。量化基于波长及其通过对STORMTIDE速度进行光谱分析而获得的近全局分布，以及与通过解决Sturm-Liouville特征值问题得出的波长之间的比较。就其幅度和地理分布而言，模拟波长与通过解决特征值问题获得的波长相比具有很好的对比，这表明STORMTIDE内部波在第一近似值上是满足局部色散关系的线性内部波。模式1和2的模拟波长分别在100-160和45-80 km之内。对于两种模式，它们的分布在不同程度上揭示了区域不对称性和极地性增加的趋势，其中分层N和科里奥利参数f分别负责这两个特征。发现模式1波长的分布由N和f决定，但是模式2的分布主要由N的变化控制。STORMTIDE波长和特征值问题之间的差异较大，尤其是对于模式2，主要是高纬度海洋，黑潮和墨西哥湾流及其延伸。

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