DOI: 10.1175/JCLI-D-16-0441.1
Scopus记录号: 2-s2.0-85019087236
论文题名: La Niña-like mean-state response to global warming and potential oceanic roles
作者: Kohyama T. ; Hartmann D.L. ; Battisti D.S.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 11 起始页码: 4207
结束页码: 4225
语种: 英语
Scopus关键词: Atmospheric pressure
; Atmospheric temperature
; Atmospheric thermodynamics
; Climate change
; Climatology
; Global warming
; Nickel
; Oceanography
; Surface waters
; Atmosphere-ocean interactions
; Climate variability
; Coupled Model Intercomparison Project
; Eastern equatorial Pacific
; ENSO
; Global climate model
; Sea surface temperature (SST)
; Trends
; Climate models
英文摘要: The majority of the models that participated in phase 5 of the Coupled Model Intercomparison Project global warming experiments warm faster in the eastern equatorial Pacific Ocean than in the west. GFDL-ESM2M is an exception among the state-of-the-art global climate models in that the equatorial Pacific sea surface temperature (SST) in the west warms faster than in the east, and the Walker circulation strengthens in response to warming. This study shows that this "La Niña-like" trend simulated by GFDL-ESM2M could be a physically consistent response to warming, and that the forced response could have been detectable since the late twentieth century. Two additional models are examined: GFDL-ESM2G, which differs from GFDL-ESM2M only in the oceanic components, warms without a clear zonal SST gradient; and HadGEM2-CC exhibits a warming pattern that resembles the multimodel mean. A fundamental observed constraint between the amplitude of El Niño-Southern Oscillation (ENSO) and the mean-state zonal SST gradient is reproduced well by GFDL-ESM2M but not by the other two models, which display substantially weaker ENSO nonlinearity than is observed. Under this constraint, the weakening nonlinear ENSO amplitude in GFDL-ESM2M rectifies the mean state to be La Niña-like. GFDL-ESM2M exhibits more realistic equatorial thermal stratification than GFDL-ESM2G, which appears to be the most important difference for the ENSO nonlinearity. On longer time scales, the weaker polar amplification in GFDL-ESM2M may also explain the origin of the colder equatorial upwelling water, which could in turn weaken the ENSO amplitude. © 2017 American Meteorological Society. 资助项目: NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49644
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
Recommended Citation:
Kohyama T.,Hartmann D.L.,Battisti D.S.. La Niña-like mean-state response to global warming and potential oceanic roles[J]. Journal of Climate,2017-01-01,30(11)