DOI: 10.1175/JCLI-D-12-00363.1
Scopus记录号: 2-s2.0-84880687804
论文题名: Influence of recent stratification changes on ENSO stability in a conceptual model of the equatorial pacific
作者: Thual S. ; Dewitte B. ; An S.-I. ; Illig S. ; Ayoub N.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 13 起始页码: 4790
结束页码: 4802
语种: 英语
Scopus关键词: Atmospheric feedbacks
; Equatorial Pacific
; Equatorial Pacific Ocean
; General circulation model
; Geophysical fluid dynamics laboratories
; Simple ocean data assimilations
; Spatial structure
; Thermocline depth
; Atmospheric pressure
; Atmospheric structure
; Climate models
; Climatology
; Modulation
; Stream flow
; Computer simulation
; air-sea interaction
; atmospheric forcing
; baroclinic mode
; climate feedback
; conceptual framework
; decadal variation
; El Nino-Southern Oscillation
; equatorial dynamics
; model test
; parameterization
; stratification
; thermocline
; thermodynamics
; upper ocean
; wind forcing
; wind stress
; Pacific Ocean
; Pacific Ocean (Equatorial)
英文摘要: Changes in the mean circulation of the equatorial Pacific Ocean partly control the strong decadal modulation of El Niño-Southern Oscillation (ENSO). This relationship is considered from the linear stability of a conceptual recharge/discharge model with parameters tuned from the observed mean state. Whereas decadal changes in the mean thermocline depth alone are usually considered in conceptual ENSO models, here focus is given to decadal changes in the mean stratification of the entire upper ocean (e.g., the mean thermocline depth, intensity, and thickness). Those stratification changes modify the projection of wind stress forcing momentum onto the gravest ocean baroclinic modes. Their influence on the simulated frequency and growth rate is comparable in intensity to the one of usual thermodynamic and atmospheric feedbacks, while they have here a secondary effect on the spatial structure and propagation of SST anomalies. This sensitivity is evidenced in particular for the climate shift of the 1970s in the Simple Ocean Data Assimilation (SODA) dataset, as well as in a preindustrial simulation of the Geophysical Fluid Dynamics Laboratory (GFDL) model showing stratification changes similar to the ones after 2000. Despite limitations of the linear stability approach, conclusions on the sensitivity to stratification may be extended to interpret the modulation and diversity of ENSO in observations and in general circulation models. ©2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51786
Appears in Collections: 气候变化事实与影响
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作者单位: Laboratoire d'Etudes en Géophysique et Océanographie Spatiales, Toulouse, France; Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea
Recommended Citation:
Thual S.,Dewitte B.,An S.-I.,et al. Influence of recent stratification changes on ENSO stability in a conceptual model of the equatorial pacific[J]. Journal of Climate,2013-01-01,26(13)