Three-dimensional mesoscale eddy identification and tracking algorithm based on pressure anomalies Liming  

作　　者：Liming YUAN Fenglin TIAN Suqin XU Chun ZHOU Jie CHEN 

机构地区：[1]CSSC Ocean Exploration Technology Institute Co.,Ltd.,Wuxi 214000,China [2]College of Information Science and Engineering,Ocean University of China,Qingdao 266100,China [3]PLA Naval Submarine Academy,Qingdao 266199,China

出　　处：《Journal of Oceanology and Limnology》2021年第6期2153-2166,共14页海洋湖沼学报（英文）

摘　　要：The Kuroshio Extension(KE)is one of the most eddy-energetic regions in the global ocean.However,most mesoscale eddy studies in the region are focused on surface eddies and the structure and characteristics of three-dimensional(3-D)eddies require additional research.In this study,we proposed a 3-D eddy identification and tracking algorithm based on pressure anomalies,similar to sea level anomalies(SLAs)for surface eddy identification.We applied this scheme to a 5-year(2008-2012)high-resolution numerical product to develop a 3-D eddy dataset in the KE.The reliability of the numerical product was verified by the 5-year temperature/salinity hydrological characteristics and surface eddy distribution.According to the 3-D eddy tracking dataset,the number of eddies decreased dramatically as the eddy existence-time increased and more anticyclonic eddies(AEs)had an existence-time longer than 1 week than cyclonic eddies(CEs).We presented daily variations in the 3-D structure of two 3-D eddy-tracking trajectories that exhibit a certain jump in depth and a shift toward the west and equator.In addition to the bowl,lens,and cone eddies that have been discovered by previous researchers,we found that there is a cylindrical eddy,and its eddy radii are almost consistent across all layers.CEs cause significant negative temperature anomalies,“negative-positive”salinity anomalies,and sinking current fields in the KE region,while AEs cause positive temperature anomalies,“positive-negative”salinity anomalies,and upward current fields.The four types of eddies have different effects on the temperature/salinity anomalies and current field distribution which are related to their structure.

关 键 词：mesoscale eddy pressure anomalies three-dimensional structure IDENTIFICATION TRACKING 

分 类 号：P731.27[天文地球—海洋科学]