This paper uses 28 years of satellite altimeter fusion data from 1993 to 2020 to identify and track the mesoscale eddies in the South China Sea based on the Sea Level Anomaly (SLA) closed contour method, with the goal of improving our overall understanding of mesoscale eddy activities in the South China Sea and further investigating the ocean dynamic processes in the region, so as to provide fundamental data for climate change studies. The study examined the spatiotemporal distribution, generation and demise, and movement trajectories of the eddies. Furthermore, key parameters including velocity, vortex radius, amplitude and Eddy Kinetic Energy (EKE) were analyzed, with a particular emphasis on the seasonal changes and mechanisms that influence EKE in two areas of the South China Sea with high energy values. The South China Sea has more cyclonic eddies than anticyclonic eddies, according to the study, and its eastern region is primarily home to high-frequency generating areas. However, the majority of the vortices will eventually dissipate in the western and central areas of the South China Sea. Furthermore, vortices usually flow farther to the west. With decreasing latitude, the eddy radius and EKE distribution gradually increase, whereas the amplitude is contrary. EKE is caused by the interaction of factors including wind field driving, seawater movement, and circulation. Seasonal changes in the EKE occur near the Luzon Strait, and the sea area east of the south in Vietnam exhibits clear characteristics.

中文翻译：

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南海中尺度涡时空特征及涡动能影响机制


本文利用1993年至2020年28年的卫星高度计融合数据，基于海平面异常（SLA）闭合等值线法对南海中尺度涡进行识别和跟踪，旨在提高对中尺度涡的整体认识。南海活动，进一步调查该地区海洋动力过程，为气候变化研究提供基础数据。该研究研究了涡流的时空分布、产生和消亡以及运动轨迹。此外，还分析了速度、涡半径、振幅和涡动能（EKE）等关键参数，特别重点分析了南海两个高能量区域EKE的季节变化和影响机制。研究表明，南海的气旋涡旋多于反气旋涡旋，其东部地区主要是高频产生区。不过，大部分涡旋最终将在南海西部和中部地区消散。此外，漩涡通常会向西流动得更远。随着纬度的降低，涡旋半径和EKE分布逐渐增大，而振幅则相反。 EKE是由风场驱动、海水运动和环流等因素相互作用引起的。 EKE的季节变化发生在吕宋海峡附近，越南南部以东海域表现出明显的特征。