Numerically reproduced internal wave spectra in the deep ocean
Numerically reproduced internal wave spectra in the deep ocean
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DOI：
10.1029/2008gl036825
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发表时间：
2009-04
影响因子：
5.2
通讯作者：
Y. Sugiyama;Y. Niwa;T. Hibiya
中科院分区：
文献类型：
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作者：
Y. Sugiyama;Y. Niwa;T. Hibiya
垂直二维内波场在最低垂直波数下的近惯性频率和半日潮频率下受力相等。这些对应于风强迫和内部潮汐强迫，内部波场的主要能量来源。经过5年的自旋上升，一个准静态的内波场与加勒特-芒克频谱的特点是成功地复制。此外，我们进行了额外的实验，通过改变强度的半日潮汐强迫相对于近惯性强迫。结果表明，只有在近惯性强迫和半日潮强迫同时提供能量的情况下，才能产生和维持加勒特-芒克谱。只要这两种能量源都可用，内波之间就会发生非线性相互作用，使得所得的内波谱变得接近加勒特-芒克谱，而与近惯性强迫与半日潮强迫的比值无关。
A vertically two‐dimensional internal wave field is forced equally at the near‐inertial frequency and the semidiurnal tidal frequency both at the lowest vertical wavenumber. These correspond to wind forcing and internal tide forcing, the main energy sources for the internal wave field. After 5 years of spin‐up, a quasi‐stationary internal wave field with characteristics of the Garrett‐Munk‐like spectrum is successfully reproduced. Furthermore, we carry out additional experiments by changing the strength of the semidiurnal tidal forcing relative to the near‐inertial forcing. It is demonstrated that the Garrett‐Munk‐like spectrum is created and maintained only when energy is supplied both from the near‐inertial forcing and the semidiurnal tidal forcing. So long as both energy sources are available, nonlinear interactions among internal waves occur such that the resulting internal wave spectrum becomes close to the Garrett‐Munk‐like spectrum irrespective of the ratio of the near‐inertial forcing to the semidiurnal tidal forcing.