DOI: 10.1175/JCLI-D-12-00106.1
Scopus记录号: 2-s2.0-84872925019
论文题名: Interdecadal relationship between the mean state and El Niño types
作者: Chung P.-H. ; Li T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 2 起始页码: 361
结束页码: 379
语种: 英语
Scopus关键词: Anomalous winds
; Atmospheric precipitation
; Eastern pacific
; Equatorial Pacific
; Feedback strength
; Heat budget analysis
; Interdecadal
; Interdecadal changes
; Mixed layer
; Numerical experiments
; Numerical results
; Observational data
; Ocean model
; Oceanic response
; Sea Surface Temperature gradients
; SST anomalies
; Vertical advection
; Wind forcing
; Wind response
; Advection
; Atmospheric temperature
; Feedback
; Nickel compounds
; air-sea interaction
; decadal variation
; El Nino-Southern Oscillation
; heat budget
; mixed layer
; sea surface temperature
; temperature gradient
; wind forcing
; zonal flow
; Pacific Ocean
; Pacific Ocean (Equatorial)
英文摘要: The interdecadal change of the mean state and two types of El Niño was investigatedbased on the analysis of observational data from 1980 to 2010. It was found that easterlytrades and sea surface temperature (SST) gradients across the equatorial Pacific undergo a regime change in 1998/99, with enhanced trades and a significant cooling (warming)overtropical eastern (western) Pacific in the later period. Accompanying this mean state change is more frequent occurrence of central Pacific (CP) El Niño during 1999-2010.The diagnosis of air-sea feedback strength showed that atmospheric precipitation and wind responses to CP El Niño are greater than those to the eastern Pacific (EP) El Niño for givena unit SST anomaly (SSTA) forcing. The oceanic response to the same wind forcing, however, is greater in the EP El Niño than in the CP El Niño. A mixed layer heat budget analysis reveals that zonal advection (thermocline change induced vertical advection) primarily contributes to the CP (EP) El Niño growth. The role of the mean SST zonal gradient in El Niño selection was investigated through idealized numerical experiments. With the increase of the background zonal SST gradient, the anomalous wind and convection response toa specified EP or CP SSTA shift to the west. Such adifference results in a bifurcation of maximum SSTA tendency, as shown from a simple ocean model. The numerical results support the notion that a shift to the La Niño-likeinterdecadal mean state is responsible for more frequent occurrence of CP-type El Niño. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52090
Appears in Collections: 气候变化事实与影响
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作者单位: Department of History and Geography, Taipei Municipal University of Education, Taipei, Taiwan; IPRC, SOEST, University of Hawaii at Manoa, Honolulu, HI 96822, United States
Recommended Citation:
Chung P.-H.,Li T.. Interdecadal relationship between the mean state and El Niño types[J]. Journal of Climate,2013-01-01,26(2)