DOI: 10.1002/2017JC013562
Scopus记录号: 2-s2.0-85041673582
论文题名: Interannual Variability of Eddy Kinetic Energy in the Subtropical Southeast Indian Ocean Associated With the El Niño-Southern Oscillation
作者: Zheng S. ; Feng M. ; Du Y. ; Meng X. ; Yu W.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 2 起始页码: 1048
结束页码: 1061
语种: 英语
英文关键词: baroclinic instability
; eddy kinetic energy
; ENSO
; interannual variability
; Southeast Indian Ocean
Scopus关键词: air-sea interaction
; annual variation
; baroclinic instability
; eddy covariance
; El Nino-Southern Oscillation
; kinetic energy
; meridional circulation
; Rossby wave
; satellite data
; sea level
; subtropical convergence
; wave propagation
; Indian Ocean
; Indian Ocean (Southeast)
; Leeuwin Current
; Pacific Ocean
; South Equatorial Current
英文摘要: Interannual variability of eddy kinetic energy (EKE) in the subtropical southeast Indian Ocean (SEIO) is investigated using satellite observations in three regions in the 20°S–35°S latitude band: R1 (108°E–115°E), R2 (100°E–108°E), and R3 (60°E–100°E). The El Niño-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 Niña (El Niño) 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. © 2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114533
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China; Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; CSIRO Oceans and Atmosphere, IOMRC, Crawley, WA, Australia; Center for Ocean and Climate Research, First Institute of Oceanography, State Oceanic Administration, Qingdao, China; Physical Oceanography Laboratory, Ocean University of China, Qingdao, China; National Marine Environmental Forecasting Center, State Oceanic Administration, Beijing, China
Recommended Citation:
Zheng S.,Feng M.,Du Y.,et al. Interannual Variability of Eddy Kinetic Energy in the Subtropical Southeast Indian Ocean Associated With the El Niño-Southern Oscillation[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(2)