DOI: 10.1175/JCLI-D-17-0256.1
Scopus记录号: 2-s2.0-85043687474
论文题名: Impact of South Pacific subtropical dipole mode on the equatorial Pacific
作者: Zheng J. ; Wang F. ; Alexander M.A. ; Wang M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 6 起始页码: 2197
结束页码: 2216
语种: 英语
英文关键词: Atmosphere-ocean interaction
; ENSO
; Interannual variability
; Sea surface temperature
; Thermodynamics
Scopus关键词: Atmospheric temperature
; Atmospheric thermodynamics
; Climate change
; Commerce
; Earth atmosphere
; Nickel
; Submarine geophysics
; Surface properties
; Surface waters
; Thermodynamics
; Tropics
; Atmosphere-ocean interactions
; Atmospheric general circulation models
; Eastern equatorial Pacific
; ENSO
; Interannual variability
; Observational analysis
; Sea surface temperature (SST)
; Sea surface temperature anomalies
; Oceanography
; air-sea interaction
; annual variation
; atmospheric general circulation model
; El Nino-Southern Oscillation
; sea surface temperature
; temperature anomaly
; thermodynamics
; trade wind
; Pacific Ocean
; Pacific Ocean (Equatorial)
; Pacific Ocean (South)
英文摘要: Previous studies have indicated that a sea surface temperature anomaly (SSTA) dipole in the subtropical South Pacific (SPSD), which peaks in austral summer (January-March), is dominated by thermodynamic processes. Observational analyses and numerical experiments were used to investigate the influence of SPSD mode on the equatorial Pacific. The model is an atmospheric general circulation model coupled to a reduced-gravity ocean model. An SPSD-like SSTA was imposed on 1 March, after which the model was free to evolve until the end of the year. The coupled model response showed that warm SSTAs extend toward the equator with northwesterly wind anomalies and then grow to El Niño-like anomalies by the end of the year. SPSD forcing weakens southeasterly trade winds and propagates warm SSTAs toward the equator through wind-evaporation-SST (WES) feedback. Meanwhile, relaxation of trade winds in the eastern equatorial Pacific depresses the thermocline and upwelling. Eastward anomalous currents near the equator cause warm horizontal advection in the central Pacific. Further experiments showed that thermodynamic coupling mainly acts on but is not essential for SSTA propagation, either from the subtropics to the equator or westward along the equator, while oceanic dynamic coupling alone also appears to be able to initiate anomalies on the equator and plays a critical role in SSTA growth in the tropical Pacific. This is consistent with observational analyses, which indicated that influence of WES feedback on SSTA propagation associated with the SPSD is limited. Finally, the warm pole close to the equator plays the dominant role in inducing the El Niño-like anomalies. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111615
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; Laboratory for Ocean and Climate Dynamics, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; University of Chinese Academy of Sciences, Beijing, China; NOAA/Earth System Research Laboratory, Boulder, CO, United States
Recommended Citation:
Zheng J.,Wang F.,Alexander M.A.,et al. Impact of South Pacific subtropical dipole mode on the equatorial Pacific[J]. Journal of Climate,2018-01-01,31(6)