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<p>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.</p>

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

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • Yang Jin,
  • Meibing Jin,
  • Changming Dong,
  • Dongxiao Wang

摘要

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.