Observations of near-inertial waves induced by parametric subharmonic instability

李秉天; 曹安州; 吕咸青

doi:10.1007/s00343-018-6307-6

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Observations of near-inertial waves induced by parametric subharmonic instability

Physics | Updated：2023-05-19

- Observations of near-inertial waves induced by parametric subharmonic instability
- Observations of near-inertial waves induced by parametric subharmonic instability
- 海洋湖沼学报（英文） 2018年36卷第3期页码：641-650
- Affiliations：
  
  1.Physical Oceanography Laboratory/CIMST, Ocean University of China and Qingdao National Laboratory for Marine Science and Technology, Qingdao 266200, China
  2.Ocean College, Zhejiang University, Ministry of Education, Zhoushan 316021, China
- Author bio：
  
  LÜ Xianqing, xqinglv@ouc.edu.cn
- Funds：
  
  the Natural Science Foundation of Shandong Province of China(ZR2014DM017);the Natural Science Foundation of Zhejiang Province(LY15D060001);the National High Technology Research and Development Program of China (863 Program)(2013AA09A502);the National Natural Science Foundation of China(41606006);the National Natural Science Foundation of China(41371496);the National Key Technology Research and Development Program(2013BAK05B04);the 111 Project of Ministry of Education of China(B07036);the China Postdoctoral Science Foundation(2017M611979)
- DOI：10.1007/s00343-018-6307-6
  中图分类号：
- 收稿：2016-11-17，
  
  录用：2017-2-14，
  
  网络首发：2017-03-23，
  
  纸质出版：2018-05
- Accepted：
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李秉天, 曹安州, 吕咸青. Observations of near-inertial waves induced by parametric subharmonic instability[J]. 海洋湖沼学报（英文）, 2018,36(3):641-650.

Bingtian LI, Anzhou CAO, Xianqing LÜ. Observations of near-inertial waves induced by parametric subharmonic instability[J]. Chinese Journal of Oceanology and Limnology, 2018, 36(3): 641-650.
李秉天, 曹安州, 吕咸青. Observations of near-inertial waves induced by parametric subharmonic instability[J]. 海洋湖沼学报（英文）, 2018,36(3):641-650. DOI： 10.1007/s00343-018-6307-6.

Bingtian LI, Anzhou CAO, Xianqing LÜ. Observations of near-inertial waves induced by parametric subharmonic instability[J]. Chinese Journal of Oceanology and Limnology, 2018, 36(3): 641-650. DOI： 10.1007/s00343-018-6307-6.

摘要

Abstract

Near-inertial waves (NIWs)

which can be generated by wind or the parametric subharmonic instability (PSI) of internal tides

are common in the South China Sea (SCS). Moored current observations from the northern SCS have revealed that the PSI of semidiurnal (D

) internal tides is another source of NIWs. The objective of this study was to examine the energy variance in the PSI of D

tides. The PSI of D

internal tides generated NIWs and waves with frequencies around the difference frequency of D

and f. The observed NIWs induced by PSI could be distinguished clearly from those elicited by typhoon Krosa. Shortly after Krosa entered the SCS

NIWs began to intensify on the surface and they propagated downward over subsequent days. The near-inertial currents were damped quickly and they became relatively weak before the waves were reinforced beneath the mixed layer when wind stress was relatively weak. Rotation spectra indicated an energy peak at exactly the difference frequency D

-f of the NIWs and D

indicating nonlinear wave-wave interaction among D

and D

-f. Depth-time maps of band-pass filtered velocities of D

-f showed the waves amplified when the NIWs were reinforced

and they intensified at depths with strong D

tides. The energies of the NIWs and D

-f had high correlation with the D

tides. The PSI transferred energy of low-mode D

internal tides to high-mode NIWs and D

-f waves. For the entire observational period

PSI reinforcement was observed only when mesoscale eddies emerged and when D

was in spring tide

revealing a close connection between mesoscale eddies and NIWs. Mesoscale eddies could increase the energy in the f-band by enhancing the PSI of D

internal tides. Thus

this represents another mechanism linking the energy of mesoscale eddies to that of NIWs.

关键词

Keywords

references

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