DOI: 10.1175/JCLI-D-15-0172.1
Scopus记录号: 2-s2.0-84991269214
论文题名: Modulation of SST interannual variability in the Agulhas leakage region associated with ENSO
作者: Putrasahan D. ; Kirtman B.P. ; Beal L.M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 19 起始页码: 7089
结束页码: 7102
语种: 英语
Scopus关键词: Atmospheric pressure
; Atmospheric temperature
; Climate change
; Climate models
; Climatology
; Mechanical waves
; Ocean currents
; Saline water
; Surface waters
; Coupled models
; Indices
; Interannual variability
; Ocean dynamics
; Rossby wave
; Variability
; Oceanography
英文摘要: The Agulhas leakage transports warm and saline water from the Indian Ocean into the South Atlantic Ocean, forming part of the upper returning arm of the meridional overturning circulation, which can influence climate. Ocean-atmosphere interactions and the strength of Agulhas leakage control sea surface temperature (SST) in the Agulhas leakage corridor, which may in turn affect regional climate variability. In a high-resolution run of the Community Climate System Model (version 3.5; CCSM3.5), it is found that the interannual variability of Agulhas leakage SST is linked to El Niño-Southern Oscillation (ENSO). Anomalous wind stress curl over the south Indian Ocean associated with ENSO excites westward-propagating oceanic Rossby waves that initiate southwestward-propagating anomalies along the coast of Africa. It takes approximately 2 years for this signal to reach the southern tip of South Africa and enter the South Atlantic, where it accounts for 20%-30% of the interannual SSH variability in the Agulhas leakage region. The authors find a similar propagation of anomalies with satellite observations. A similar ENSO cycle along with Rossby wave adjustment is detected in an analogous low-resolution CCSM3.5 run. However, the signal does not propagate all the way along the boundary to affect Agulhas leakage SST. Hence, it is found that high-resolution coupled climate models are necessary to resolve the tropical-subtropical oceanic teleconnection between ENSO and Agulhas leakage SST. © 2016 American Meteorological Society. 资助项目: NSF, Norsk Sykepleierforbund
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50268
Appears in Collections: 气候变化事实与影响
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作者单位: Rosenstiel School of Marine and Atmospheric Science, Miami, FL, United States
Recommended Citation:
Putrasahan D.,Kirtman B.P.,Beal L.M.. Modulation of SST interannual variability in the Agulhas leakage region associated with ENSO[J]. Journal of Climate,2016-01-01,29(19)