Eddy diffusivity and coherent mesoscale eddy analysis in the Southern Ocean

作     者：Wenjin Sun Jingsong Yang Wei Tan Yu Liu Baojun Zhao Yijun He Changming Dong Wenjin Sun;Jingsong Yang;Wei Tan;Yu Liu;Baojun Zhao;Yijun He;Changming Dong

作者机构：School of Marine SciencesNanjing University of Information Science and TechnologyNanjing 210044China State Key Laboratory of Satellite Ocean Environment DynamicsSecond Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519080China College of Ocean Science and EngineeringShandong University of Science and TechnologyQingdao 266590China Marine Science and Technology CollegeZhejiang Ocean UniversityZhoushan 316022China College of Hydraulic Science and EngineeringYangzhou UniversityYangzhou 225009China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2021年第40卷第10期

页      面：1-16页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：The National Key Research Programs of China under contract No.2017YFA0604100 the National Natural Science Foundation of China under contract Nos 41906008,41806039 and 41706205 the Open Fund of State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,MNR under contract No.QNHX2022 the Startup Foundation for Introducing Talent of Nanjing University of Information Science&Technology under contract No.2019r049 the Startup Foundation for Introducing Talent of Zhejiang Ocean University the Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)under contract No.311020004 

主　　题：eddy diffusivity transient mesoscale eddy coherent mesoscale eddy eddy penetration depth Southern Ocean 

摘      要：The spatial distribution of eddy diffusivity,basic characteristics of coherent mesoscale eddies and their relationship are analyzed from numerical model outputs in the Southern *** fluctuation information is obtained by a temporal-spatial filtering method,and the eddy diffusivity is calculated using a linear regression analysis between isoneutral thickness flux and large-scale isoneutral thickness *** eddy diffusivity is on the order of O(103 m2/s)with a significant spatial variation,and it is larger in the area with strong coherent mesoscale eddy *** mesoscale eddies are mainly located in the upper ocean layer,with the average intensity no larger than *** mean radius of the coherent mesoscale cyclonic(anticyclonic)eddy gradually decays from(121.2±10.4)km((117.8±9.6)km)at 30°S to(43.9±5.3)km((44.7±4.9)km)at 65°*** vertical penetration depths(lifespans)are deeper(longer)between the northern side of the Subpolar Antarctic Front and 48°*** normalized eddy diffusivity and coherent mesoscale eddy activity show a significant positive correlation,indicating that coherent mesoscale eddy plays an important role in eddy diffusivity.