DOI: 10.1175/JCLI-D-16-0616.1
Scopus记录号: 2-s2.0-85025692511
论文题名: Seasonal and interannual variabilities of the central Indian Ocean Mode
作者: Zhou L. ; Murtugudde R. ; Chen D. ; Tang Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 16 起始页码: 6505
结束页码: 6520
语种: 英语
Scopus关键词: Atmospheric thermodynamics
; Dynamics
; Energy transfer
; Nickel
; Wind
; ENSO
; Interannual variability
; Intraseasonal variability
; Monsoons
; Seasonal variability
; Climate change
英文摘要: The central Indian Ocean (CIO) mode, an intrinsic coupled mode, plays an important role in the intraseasonal variabilities over the Indian monsoon region. Besides the intraseasonal variabilities, the CIO mode also has pronounced seasonal and interannual variabilities. The CIO mode is active during boreal summer but suppressed during boreal winter. The seasonality is mainly attributable to the barotropic instability, which is caused by the large meridional shear of zonal winds. By decomposing the temporal tendency of the meridional gradient of zonal winds, it is found that the zonal wind shear mainly follows the variation of the horizontal eddy flux, which indicates the importance of the multiscale interaction in tropical dynamics. The interannual variability of the CIO mode also depends on the energy transfer associated with the barotropic instability. The influences of El Niño or La Niña and Indian Ocean dipole-zonal mode (IODZM) on the CIO mode are analyzed. El Niño and La Niña have moderate impacts on the CIO mode. El Niño weakens the CIO mode and La Niña strengthens it via the changes in the low-level zonal wind shear.IODZMdoes not significantly change the amplitude of the CIO mode but can shift its latitudinal position by modifying the meridional shear of the zonal winds. The low-frequency variabilities of the CIO mode at seasonal and interannual time scales unveil the impacts of the background circulations at the intraseasonal variabilities during the Indian summer monsoon in a multiscale framework. While the low-frequency variabilities of this mode will clearly have an implication for monsoon variability and prediction, further studies are needed to quantify the impacts. © 2017 American Meteorological Society. 资助项目: NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48742
Appears in Collections: 气候减缓与适应 气候变化与战略
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作者单位: State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Hangzhou, China; Institute of Oceanography, Shanghai Jiao Tong University, Shanghai, China; University of Maryland, College Park, College Park, MD, United States; Environmental Science and Engineering, University of Northern British Columbia, Prince George, BC, Canada
Recommended Citation:
Zhou L.,Murtugudde R.,Chen D.,et al. Seasonal and interannual variabilities of the central Indian Ocean Mode[J]. Journal of Climate,2017-01-01,30(16)