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<p>The lifetime of mesoscale eddies correlates with parameters such as radius, amplitude, and wind stress curl, yet systematic quantitative studies on the associations of multiple parameters with lifetime remain scarce. This study employs a coherent vortex detection method based on Lagrangian-averaged vorticity deviation to identify mesoscale eddies in the South China Sea (SCS) and the South Atlantic Ocean. We analyze the relationships of 11 parameters, including environmental factors, on vortex lifetime and quantify their associations using ridge regression. Results reveal that in the SCS, amplitude shows the strongest correlation with lifetime, followed by radius, nonlinear parameter <i>U/c</i> (max rotation speed to mean propagation speed ratio), and roundness, whereas boundary kinetic energy (EKEbnd) exhibits the weakest association. In the South Atlantic, however, the importance of <i>U/c</i> declines significantly, and EKEbnd becomes a dominant factor, ranking only below radius and amplitude. These pronounced regional differences indicate that parameter importance varies significantly across different oceanic regions, likely due to distinct environmental conditions. By controlling for individual key parameters that show significant correlations with lifetime, we further investigate the roles of dynamic characteristics and topography. Results show that in nearshore waters, topography-induced variability outweighs dynamic parameters, underscoring the influence of the SCS’s complex topography on vortex lifetime.</p>

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A quantitative study on factors associated with vortex lifetime

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • Zekai Chen,
  • Yifan Liu,
  • Qiong Xia

摘要

The lifetime of mesoscale eddies correlates with parameters such as radius, amplitude, and wind stress curl, yet systematic quantitative studies on the associations of multiple parameters with lifetime remain scarce. This study employs a coherent vortex detection method based on Lagrangian-averaged vorticity deviation to identify mesoscale eddies in the South China Sea (SCS) and the South Atlantic Ocean. We analyze the relationships of 11 parameters, including environmental factors, on vortex lifetime and quantify their associations using ridge regression. Results reveal that in the SCS, amplitude shows the strongest correlation with lifetime, followed by radius, nonlinear parameter U/c (max rotation speed to mean propagation speed ratio), and roundness, whereas boundary kinetic energy (EKEbnd) exhibits the weakest association. In the South Atlantic, however, the importance of U/c declines significantly, and EKEbnd becomes a dominant factor, ranking only below radius and amplitude. These pronounced regional differences indicate that parameter importance varies significantly across different oceanic regions, likely due to distinct environmental conditions. By controlling for individual key parameters that show significant correlations with lifetime, we further investigate the roles of dynamic characteristics and topography. Results show that in nearshore waters, topography-induced variability outweighs dynamic parameters, underscoring the influence of the SCS’s complex topography on vortex lifetime.