文献类型：期刊文献

英文题名：Seasonal variability of eddy kinetic energy in the East Australian current region

作者：Liu, Jia[1];Zheng, Shaojun[1,2,3];Feng, Ming[4];Xie, Lingling[1,2,3];Feng, Baoxin[1,2,3];Liang, Peng[1,2,3];Wang, Lei[1,2,3];Yang, Lina[1,2,3];Yan, Li[1,2,3]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang, Guangdong, Peoples R China;[2]Guangdong Ocean Univ, Key Lab Climate Resources & Environm Continental, Dept Educ Guangdong Prov, Zhanjiang, Guangdong, Peoples R China;[3]Minist Nat Resources, Key Lab Space Ocean Remote Sensing & Applicat, Beijing, Peoples R China;[4]Indian Ocean Marine Res Ctr, CSIRO Oceans & Atmosphere, Crawley, WA, Australia

年份：2022

卷号：9

外文期刊名：FRONTIERS IN MARINE SCIENCE

收录：SCI-EXPANDED(收录号：WOS:000899112000001)、、Scopus(收录号：2-s2.0-85144084727)、WOS

基金：This study was supported by Guangdong Provincial College Innovation Team Project (2019KCXTF021), First-class Discipline Plan of Guangdong Province (080507032201, 080503032101 and 231420003), the Natural Science Foundation of China (42130605, 41706033 and 42006023), program for scientific research start-up funds of Guangdong Ocean University (R18023 and R19061). Guangdong Postgraduate Education Innovation Project (2022SFKC_057). The sea level anomaly (SLA) data was provided by Archiving, Validation and Interpretation of Satellite Oceanographic (AVISO, http://www.aviso.altimetry.fr/en/home.html). The OFES data were provided by Asia-Pacific Data Research Center (APDRC, http://apdrc.soest.hawaii.edu/dods/public_ofes/OfES/qscat_0.1_global_3day).

语种：英文

外文关键词：eddy kinetic energy; seasonal variability; barotropic and baroclinic instabilities; the East Australian Current; zonal shear of meridional velocities

外文摘要：The East Australian Current (EAC) is an important western boundary current of the South Pacific subtropical Circulation with high mesoscale eddy kinetic energy (EKE). Based on satellite altimeter observations and outputs from the eddy-resolving ocean general circulation model (OGCM) for the Earth Simulator (OFES), the seasonal variability of EKE and its associated dynamic mechanism in the EAC region are studied. High EKE is mainly concentrated in the shear-region between the poleward EAC southern extension and the equatorward EAC recirculation along Australia's east coast, which is confined within the upper ocean (0-300 m). EKE in this area exhibits obvious seasonal variation, strong in austral summer with maximum (465 +/- 89 cm(2) s-(2)) in February and weak in winter with minimum (334 +/- 48 cm(2) s-(2)) in August. Energetics analysis from OFES suggests that the seasonal variability of EKE is modulated by the mixed instabilities composed of barotropic and baroclinic instabilities confined within the upper ocean, and barotropic instability (baroclinic instability) is the main energy source of EKE in austral summer (winter). The barotropic process is mainly controlled by the zonal shear of meridional velocities of the EAC southern extension and the EAC recirculation. The poleward EAC southern extension and the equatorward EAC recirculation are synchronously strengthened (weakened) due to the local positive (negative) sea level anomalies (SLA) under geostrophic equilibrium, and the barotropic instability dominated by zonal shear is enhanced (slackened), which results in a high (low) level of EKE in the EAC region.