Migration of mesoscale eddies across a leaping or penetrating western boundary current in the vicinity of a gap  

作　　者：SONG Xinxin YUAN Dongliang LI Ruixiang WANG Zheng 宋新新;袁东亮;李锐祥;王铮

机构地区：[1]Key Laboratory of Ocean Circulation and Waves,Institute of Oceanology,Chinese Academy of Sciences,and Function Laboratory for Ocean Dynamics and Climate,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China [2]Key Laboratory of Marine Science and Numerical Modeling,First Institute of Oceanography,State Oceanic Administration,and Laboratory for Regional Oceanography and Numerical Modeling,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266061,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]South China Sea Marine Survey and Technology Center,State Oceanic Administration,Guangzhou 510300,China

出　　处：《Journal of Oceanology and Limnology》2018年第6期2098-2109,共12页海洋湖沼学报（英文）

基　　金：Supported by the National Program on Global Change and Air-Sea Interaction(Nos.GASI-03-01-01-05,GASI-IPOVAI-01-02,GASIIPOVAI-02,GASI-IPOVAI-03,GASI-IPOVAI-01-05,GASI-03-01-01-02);the National Natural Science Foundation of China(Nos.41421005,41720104008,41476025,41376038,41206019);the Shandong Joint Fund for Marine Science Research Centers(Nos.U1606402,U1606405);the CAS Strategic Priority Project(No.XDA11010205);the Scientific and Technological Innovation Project of Qingdao National Laboratory for Marine Science and Technology(No.2016ASKJ04);the National Science and Technology Major Project(No.2016ZX05057015);the Open Fund of Shandong Provincial Key Laboratory of Marine Ecology and Environment&Disaster Prevention and Mitigation(No.201701)

摘　　要：A 1.5-layer quasi-geostrophic reduced gravity ocean circulation model is used to study the propagation of mesoscale eddies across a western boundary current(WBC) either leaping across or penetrating in an anti-cyclonic path through the gap. The steady leaping WBC nearly blocks all eddies from propagating across it through the gap completely. However, both cyclonic and anti-cyclonic eddies can migrate across a penetrating WBC in the vicinity of a gap, while inducing an opposite type of eddies on the cyclonic side of the WBC by weakening or strengthening the intrusion of the WBC. Both type of eddies gained strength from the WBC in the course of the propagation across the WBC in the gap. Eddies approaching the gap from the upstream are found to migrate more easily into the western basin due to the advection of the WBC. The migration speeds of the eddies are almost unchanged by the presence of the WBC in all experiments.A 1.5-layer quasi-geostrophic reduced gravity ocean circulation model is used to study the propagation of mesoscale eddies across a western boundary current(WBC) either leaping across or penetrating in an anti-cyclonic path through the gap. The steady leaping WBC nearly blocks all eddies from propagating across it through the gap completely. However, both cyclonic and anti-cyclonic eddies can migrate across a penetrating WBC in the vicinity of a gap, while inducing an opposite type of eddies on the cyclonic side of the WBC by weakening or strengthening the intrusion of the WBC. Both type of eddies gained strength from the WBC in the course of the propagation across the WBC in the gap. Eddies approaching the gap from the upstream are found to migrate more easily into the western basin due to the advection of the WBC. The migration speeds of the eddies are almost unchanged by the presence of the WBC in all experiments.

关 键 词：MESOSCALE EDDY Western Boundary Current GAP 

分 类 号：P[天文地球]