中国海洋大学学报（自然科学版）2025，Vol.55Issue(12)：13-25,13.DOI:10.16441/j.cnki.hdxb.20250046
西北太平洋与南海中尺度涡的运动学特征研究
Kinematic Characteristics of Mesoscale Eddies in the Northwestern Pacific and South China Sea
摘要
Abstract
Mesoscale eddies are a widely occurring"weather-scale"oceanic dynamic phenomenon.Identifying mesoscale eddies and analyzing their kinematic characteristics are of great significance for oceanographic research,fisheries,navigation,and military strategy.This study utilizes satellite altimeter data from 1993 to 2022,combined with an optimized mesoscale eddy identification and tracking algorithm,to identify and track mesoscale eddies in the Northwest Pacific and the South China Sea,obtaining key kinematic parameters of eddies in these regions.A total of 16 240 eddies were identified,with cyclonic and anticyclonic eddies occurring in nearly equal numbers.Long term eddies(lasting 28 d or more)accounted for 6 458 cases,while short-term eddies(10～27 d)totaled 9 782,making up 60.2%of all eddies and contributing 21.1%of the total eddy kinetic en-ergy.This underscores the critical role of short-term eddies in mesoscale eddy research and oceanic energy bal-ance.Further analysis revealed that the subtropical countercurrent region,the western Luzon Strait,and eastern Vietnam are the primary generation areas for long-term eddies.Meanwhile,short-term eddies are mainly generated in the western boundary current region of the Northwest Pacific,the subtropical countercurrent region,the western Luzon Strait,the western side of Luzon Island,and southeastern Vietnam.The spatial dis-tribution of short-term eddies'mean radius,amplitude,relative vorticity,propagation speed,and kinetic energy resembles that of long-term eddies,but their intensity is significantly lower,suggesting that eddy lifespan is influenced by eddy strength.Regardless of lifespan,eddies in the Northwest Pacific exhibit greater numbers,larger mean radius,higher amplitudes,and faster propagation speeds than those in the South China Sea,while their mean vorticity is lower.The mean kinetic energy of eddies in both regions is comparable.Among the key eddy formation areas,southeastern Vietnam has the highest relative vorticity,the subtropical countercurrent region has the greatest number and amplitude of eddies,and the tropical region features the largest radius and kinetic energy.Meanwhile,the western Luzon Strait shows intermediate values across all parameters.This study delineates the fundamental kinematic characteristics of mesoscale eddies in the Northwest Pacific and the South China Sea,highlights the importance of short-term eddies,and enhances the understanding of mesoscale eddies in the studied regions.关键词
中尺度涡/运动学特征/短寿命涡旋/识别与追踪/西北太平洋/南海Key words
mesoscale eddy/kinematic characteristics/short-term eddy/identification and tracking/Northwestern Pacific/South China Sea分类
海洋学引用本文复制引用
文牧宽,孙忠斌,张志伟..西北太平洋与南海中尺度涡的运动学特征研究[J].中国海洋大学学报（自然科学版）,2025,55(12):13-25,13.基金项目
国家自然科学基金项目(42222601,42206015) （42222601,42206015）
山东省自然科学基金项目(ZR2023JQ013)资助 Supported by the National Natural Science Foundation of China(42222601,42206015) （ZR2023JQ013）
the Natural Science Foundation of Shandong Province(ZR2023JQ013) （ZR2023JQ013）
