Nonlinear interactions among internal tidal waves in the northeastern South China Sea

Xiaohui Xie; Xiaodong Shang; Guiying Chen

doi:10.1007/s00343-010-9064-8

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Nonlinear interactions among internal tidal waves in the northeastern South China Sea

Updated：2023-05-16

- Nonlinear interactions among internal tidal waves in the northeastern South China Sea
- Journal of Oceanology and Limnology Vol. 28, Issue 5, Pages: 996-1001(2010)
- Affiliations：
  
  1. Key Laboratory of Tropical Marine Environmental Dynamics Marine Observation & Research Laboratory South China Sea Institute of Oceanology Chinese Academy of Sciences
  2. Graduate University of the Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/s00343-010-9064-8
  CLC：
- Online First：11 September 2010，
  
  Published：2010
- Accepted：
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Xie, X., Shang, X. & Chen, G. Nonlinear interactions among internal tidal waves in the northeastern South China Sea., Chin. J. Ocean. Limnol. 28, 996–1001 (2010). https://doi.org/10.1007/s00343-010-9064-8
DOI：

Xie, X., Shang, X. & Chen, G. Nonlinear interactions among internal tidal waves in the northeastern South China Sea., Chin. J. Ocean. Limnol. 28, 996–1001 (2010). https://doi.org/10.1007/s00343-010-9064-8 DOI：

摘要

Abstract

We used a set of 75-day long ADCP data from the northeastern South China Sea (SCS) to investigate nonlinear interactions among freely propagating internal tidal waves. The kinetic energy spectra displayed significant peaks at some higher tidal frequencies

such as O1M2 (O1+M2)

and M4 (M2+M2)

where O1 is the lunar diurnal internal tide

M2 is the lunar semidiurnal internal tide

and M4 is the first higher harmonic frequency of M2. These higher tidal harmonic frequency peaks

as well as the fundamental tidal harmonic peaks

show a σ −2.3 spectral falloff rate with frequency. In addition

we explored the possible generation mechanism of higher tidal harmonics. Analysis on the rotary and bicoherence spectra suggests that strong forced non-resonant interaction induced by nonlinear advections was the dominant physical mechanism that induced these higher tidal harmonics. Moreover

the energetic

freely propagating semidiurnal (M2) internal tidal wave played the most crucial role in these interactions. These results indicate that strong nonlinear forced non-resonant interactions among internal tides can be one of the processes responsible for the redistribution of energy in the internal wave spectrum.

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