The lifespan mechanism of dipole eddies to the east of Vietnam and their intrinsic connections

Yang JIN; Meibing JIN; Changming DONG; Dongxiao WANG

doi:10.1007/s00343-024-4020-1

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The lifespan mechanism of dipole eddies to the east of Vietnam and their intrinsic connections

Physics | Updated：2025-10-16

- The lifespan mechanism of dipole eddies to the east of Vietnam and their intrinsic connections
- Journal of Oceanology and Limnology Vol. 43, Issue 5, Pages: 1375-1388(2025)
- Affiliations：
  
  1.School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing 210000, China
  2.Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China
  3.International Arctic Research Center, University of Alaska Fairbanks, Fairbanks AK 99709, USA
  4.School of Marine Sciences, Sun Yat-sen University, Zhuhai 519000, China
- Author bio：
  
  mjin@nuist.edu.cn
- Funds：
- DOI：10.1007/s00343-024-4020-1
  CLC：
- Received：19 January 2024，
  
  Accepted：25 March 2024，
  
  Online First：10 May 2024，
  
  Published：01 September 2025
- Accepted：
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JIN Yang,JIN Meibing,DONG Changming,et al.The lifespan mechanism of dipole eddies to the east of Vietnam and their intrinsic connections[J].Journal of Oceanology and Limnology,2025,43(05):1375-1388.
DOI：

JIN Yang,JIN Meibing,DONG Changming,et al.The lifespan mechanism of dipole eddies to the east of Vietnam and their intrinsic connections[J].Journal of Oceanology and Limnology,2025,43(05):1375-1388. DOI： 10.1007/s00343-024-4020-1.

摘要

Abstract

A cyclonic eddy (CE) is often accompanied by an anticyclonic eddy (AE) to the east of Vietnam in the South China Sea (SCS) in summer

but the dipole lifetime and the intrinsic connection between CE and AE are still understudied. Data from 1993–2021 reveal that the dipole lifetime are significantly correlated with the wind direction and speed in the dipole region. Higher wind speed was found to be associated with more eastward wind direction and tends to longer dipole lifetime. The wind stress work (WW) on the eddy is much stronger in the eastward jet region than in the CE and AE regions. Comparing of results of 12 higher and lower wind speed years reveal that higher wind can produce stronger mean current

WW and barotropic instability (T4) that further enhances eddy kinetic energy (EKE) and dipole lifetime. The correlations between the dipole CE and AE characteristics are insignificant on interannual scales and mostly insignificant on seasonal scales in the surface layer but significant on seasonal scales in the subsurface layers. In addition

the daily mean vertical profiles (0–500 m) of EKE

vorticity and total deformation rate (TD) between CE and AE remain significantly correlated throughout the dipole’s lifetime

which can be a useful criterion for judging if two eddies are a dipole.

关键词

Keywords

references

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