Observations of semidiurnal M<sub>2</sub> internal tidal parametric subharmonic instability in the northeastern South China Sea

Qian LIU; Xiaodong SHANG; Xiaohui XIE

doi:10.1007/s00343-019-9131-8

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Observations of semidiurnal M₂ internal tidal parametric subharmonic instability in the northeastern South China Sea

Physics | Updated：2023-05-20

- Observations of semidiurnal M₂ internal tidal parametric subharmonic instability in the northeastern South China Sea
- Journal of Oceanology and Limnology Vol. 39, Issue 1, Pages: 56-63(2021)
- Affiliations：
  
  1.School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
  2.State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
  3.Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou 511458, China
  4.State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310000, China
- Author bio：
  
  Xiaodong SHANG, E-mail:xdshang@scsio.ac.cn
- Funds：
- DOI：10.1007/s00343-019-9131-8
  CLC：
- Received：20 May 2019，
  
  Accepted：19 September 2019，
  
  Online First：16 December 2019，
  
  Published：2021-01
- Accepted：
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Qian LIU, Xiaodong SHANG, Xiaohui XIE. Observations of semidiurnal M₂ internal tidal parametric subharmonic instability in the northeastern South China Sea[J]. Journal of Oceanology and Limnology, 2021, 39(1): 56-63.
DOI：

Qian LIU, Xiaodong SHANG, Xiaohui XIE. Observations of semidiurnal M₂ internal tidal parametric subharmonic instability in the northeastern South China Sea[J]. Journal of Oceanology and Limnology, 2021, 39(1): 56-63. DOI： 10.1007/s00343-019-9131-8.

摘要

Abstract

Near-diurnal vertically-standing waves with high vertical wavenumbers

were observed in the velocity and shear fields from a set of 75-d long ADCP moored in the northeastern South China Sea (SCS) away from the "critical" latitude of 28.8°. These enhanced near-diurnal internal waves followed a fortnightly spring-neap cycle. However

they always happened during semidiurnal spring tides rather than diurnal springs although strong diurnal internal tides with the fortnightly spring-neap cycle were prevailing

suggesting that they were generated via subharmonic instability (PSI) of dominant semidiurnal M

internal tides. When two semidiurnal internal tidal waves with opposite vertical propagation direction intersected

both semidiurnal subharmonic and super harmonic waves were largely intensified. The observed maximum diurnal velocity amplitudes were up to 0.25 m/s. The kinetic energy and shear spectra further suggested that frequencies of daughter waves were not always perfectly equal to M

/2. The superposition of two daughter waves with nearly equal frequencies and nearly opposite

in a PSI-triad leaded to the vertically-standing waves.

关键词

Keywords

references

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Observations of semidiurnal M2 internal tidal parametric subharmonic instability in the northeastern South China Sea

DOI：10.1007/s00343-019-9131-8

摘要

Abstract

关键词

Keywords

references

Observations of semidiurnal M₂ internal tidal parametric subharmonic instability in the northeastern South China Sea