基于AVISO卫星测高数据的海洋中尺度涡识别算法对比分析  

Comparison and Analysis of Mesoscale Ocean Eddies Identification Algorithms Based on AVISO Satellite Altimetry Data

作　　者：朱金彤 范陈清 万勇[2] 李潇寒[2] ZHU Jintong;FAN Chenqing;WAN Yong;LI Xiaohan(First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China;College of Oceanography and Space Informatics,China University of Petroleum(East China),Qingdao 266580,China;Technology Innovation Center for Ocean Telemetry,Ministry of Natural Resources,Qingdao 266061,China)

机构地区：[1]自然资源部第一海洋研究所,山东青岛266061 [2]中国石油大学(华东)海洋与空间信息学院,山东青岛266580 [3]自然资源部海洋遥测技术创新中心,山东青岛266061

出　　处：《海洋技术学报》2025年第2期1-14,共14页Journal of Ocean Technology

摘　　要：本文基于2018—2022年AVISO(Archiving,Validation and Interpretation of Satellite Oceanographic)卫星高度计数据融合产品,分别利用OW(Okubo-Weiss)参数法、闭合等值线法、海面高度异常(Sea Level Anomaly,SLA)极值与闭合等值线结合法对南海及西北太平洋海域中尺度涡进行识别,并在此基础上对比分析了不同涡旋识别算法对中尺度涡的探测能力。研究表明:OW参数法存在涡旋识别过剩问题和涡旋分割现象,仅能有效识别涡核区域,导致识别的涡旋半径、涡旋面积和振幅偏小。闭合等值线法具有良好的识别效果,但无法区分单核涡旋和多核涡旋,无法识别涡旋内部结构。SLA极值与闭合等值线结合法只能识别单核涡旋,无法识别涡旋的内部结构,并且存在涡旋遗漏问题。因此,针对SLA极值与闭合等值线结合法存在的上述问题,本文通过取消仅包含一个极值作为寻找最外层等值线的限制条件,并减小搜索增幅,对最内层闭合等值线和最外层闭合等值线同时进行搜索。改进后的算法不仅可以识别出多核涡旋,还可以同时识别出涡旋外部和内部结构,并且有效改善了SLA极值与闭合等值线结合法存在的涡旋遗漏问题。Based on the 2018要2022 Archiving,Validation and Interpretation of Satellite Oceanographic(AVISO)satellite altimeter fusion products,this paper identifies mesoscale eddies in the South China Sea and the Northwest Pacific Ocean by applying the Okubo-Weiss(OW)parameter method,the closed contour method,and the combination of sea level anomaly(SLA)extremum and closed contour method,and then compares and analyzes the detection ability of different eddy identification algorithms for mesoscale eddies.An analysis reveals an issue of excessive eddy identification and segmentation phenomenon when applying the OW parameter method regarding the count of detected eddies.The algorithm忆s characteristic is confined to the core region of the eddy,resulting in underestimated measurements of eddy radius,area,and amplitude.The application of the closed contour method yields favorable outcomes.However,it fails to distinguish between single-core and multi-core eddies,nor does it recognize the internal structure of the eddies.Moreover,the application of the SLA extremum and closed contour method confines itself to the recognition of single-core eddies.It also fails to distinguish between multi-core eddies or the internal structure of the eddies.Therefore,to address the above problems of the combination of SLA extremum and closed contour method,this paper searches both the innermost closed contour and the outermost closed contour simultaneously by removing the inclusion of only one extremum as a restriction on finding the outermost contour and reducing the search increase.The improved algorithm not only recognizes multicore eddies,but also identifies both the external and internal structures of eddies,and effectively improves the problem of eddy omission in the recognition process of the combined SLA extremum and closed contour method.

关 键 词：中尺度涡 涡旋识别算法 卫星高度计 南海 西北太平洋 

分 类 号：P721[天文地球—海洋科学]