空气动力学学报2026，Vol.44Issue(8)：70-77,8.DOI:10.7638/kqdlxxb-2025.0093
基于曲率涡度诊断的涡旋演化与水体交换机制研究
Eddy evolution and water exchange mechanisms based on curvature vorticity diagnostics
摘要
Abstract
Mesoscale eddies play a central role in ocean dynamics and material transport,with their rotational structures exerting significant regulatory effects on water exchange and transport processes.Based on high-resolution numerical simulations combined with curvature vorticity diagnostics,this study analyzes the dynamic evolution of cyclonic and anticyclonic eddies and their influence on water exchange.The results show that eddies form stable,closed circulation structures at the surface,effectively"trapping"water masses and significantly prolonging their exposure time.Meanwhile,the distribution of exposure time exhibits strong vertical dependence,with the spatial distribution evolving from a near-circular pattern at the surface to a more concentrated and asymmetric structure in the middle and bottom layers.At the eddy periphery,central Ekman suction and enhanced mixing jointly maintain both the enclosed nature of the eddy and the exchange activity along its boundary.Curvature vorticity diagnostics reveal that while the rotational structure strongly influences the distribution of exposure time,the dynamic evolution of cyclonic and anticyclonic eddies differs markedly.The early stage of anticyclonic eddy formation is dominated by the banking term,transitioning to dominance by the stretching term during the stable phase.In contrast,cyclonic eddies enter the unstable stage earlier,with their development mainly controlled by transport term and vortex stretching.关键词
中尺度涡旋/海洋动力过程/物质输运/曲率涡度诊断/暴露时间Key words
mesoscale eddy/ocean dynamic processes/material transport/curvature vorticity diagnostics/exposure time分类
海洋科学引用本文复制引用
陈莹,刘志强,蔡忠亚,崔凌波..基于曲率涡度诊断的涡旋演化与水体交换机制研究[J].空气动力学学报,2026,44(8):70-77,8.基金项目
国家自然科学基金(42376024,42276004) （42376024,42276004）
