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Interannual Variability of Eddy Kinetic Energy in the Subtropical Southeast Indian Ocean Associated With the El Nino-Southern Oscillation
Zheng, SJ; Feng, M; Du, Y; Meng, XF; Yu, WD; zhengshaojun@scsio.ac.cn; Ming.Feng@csiro.au
2018
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
Volume123Issue:2Pages:1048-1061
AbstractInterannual variability of eddy kinetic energy (EKE) in the subtropical southeast Indian Ocean (SEIO) is investigated using satellite observations in three regions in the 20 degrees S-35 degrees S latitude band: R1 (108 degrees E-115 degrees E), R2 (100 degrees E-108 degrees E), and R3 (60 degrees E-100 degrees E). The El Nino-Southern Oscillation (ENSO) plays an important role in modulating the interannual variability of EKE in the SEIO. EKE in the three regions shows negative correlations with the Nino3.4, lagging Nino3.4 by 2, 14, and 22 months, respectively. In R1, the ENSO modulates the interannual variability of EKE through influencing baroclinic instability of meridional velocity shear between the upper poleward Leeuwin Current (LC) and the underlying equatorward Leeuwin Undercurrent (LUC). During La Nina (El Nino) year, both the poleward LC and equatorward LUC strengthened (weakened) due to the high (low) sea level anomaly (SLA) propagating from the Pacific Ocean as Rossby wave under geostrophic equilibrium, and baroclinic instability of vertical shear enhanced (slackened), further induced the strong (weak) EKE in the eastern boundary. In R2, the ENSO modulates the interannual variability of EKE through influencing baroclinic instability of zonal velocity shear between the central and southern branches of the upper eastward South Indian Countercurrent (SICC) and the lower extending westward South Equatorial Current (SEC). In R3, both the ENSO and the Southern Annual Mode modulate the interannual variability of EKE through influencing baroclinic instability of zonal velocity shear between the SICC and SEC. The interannual variability of EKE in the interior SEIO could be influenced by westward propagation of EKE originated from eastern boundary.
Department[Zheng, Shaojun; Du, Yan] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China; [Zheng, Shaojun; Yu, Weidong] Qingdao Natl Lab Marine Sci & Technol, Lab Reg Oceanog & Numer Modeling, Qingdao, Peoples R China; [Zheng, Shaojun; Feng, Ming] CSIRO Oceans & Atmosphere, IOMRC, Crawley, WA, Australia; [Zheng, Shaojun; Yu, Weidong] State Ocean Adm, Inst Oceanog 1, Ctr Ocean & Climate Res, Qingdao, Peoples R China; [Meng, Xiangfeng] Ocean Univ China, Phys Oceanog Lab, Qingdao, Peoples R China; [Yu, Weidong] State Ocean Adm, Natl Marine Environm Forecasting Ctr, Beijing, Peoples R China
KeywordEddy Kinetic Energy Interannual Variability Enso Baroclinic Instability Southeast Indian Ocean
Subject AreaOceanography
Funding ProjectLTO
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17098
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authorzhengshaojun@scsio.ac.cn; Ming.Feng@csiro.au
Recommended Citation
GB/T 7714
Zheng, SJ,Feng, M,Du, Y,et al. Interannual Variability of Eddy Kinetic Energy in the Subtropical Southeast Indian Ocean Associated With the El Nino-Southern Oscillation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2018,123(2):1048-1061.
APA Zheng, SJ.,Feng, M.,Du, Y.,Meng, XF.,Yu, WD.,...&Ming.Feng@csiro.au.(2018).Interannual Variability of Eddy Kinetic Energy in the Subtropical Southeast Indian Ocean Associated With the El Nino-Southern Oscillation.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,123(2),1048-1061.
MLA Zheng, SJ,et al."Interannual Variability of Eddy Kinetic Energy in the Subtropical Southeast Indian Ocean Associated With the El Nino-Southern Oscillation".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 123.2(2018):1048-1061.
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