DOI: 10.1175/JCLI-D-16-0748.1
Scopus记录号: 2-s2.0-85025631096
论文题名: Understanding bias in the evaporative damping of El Niño-Southern Oscillation events in CMIP5 models
作者: Ferrett S. ; Collins M. ; Ren H.-L.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 16 起始页码: 6351
结束页码: 6370
语种: 英语
Scopus关键词: Atmospheric pressure
; Climate models
; Climatology
; Damping
; Feedback
; Fluxes
; Latent heat
; Nickel
; Wind
; Coupled general circulation models
; EL Nino
; ENSO
; Intertropical convergence zone
; Latent heating/cooling
; Meridional surface wind
; Model errors
; Thermodynamical process
; Heat flux
英文摘要: This study examines the extent of the Pacific double-intertropical convergence zone (ITCZ) bias in an ensemble of CMIP5 coupled general circulation models and the relationship between this common bias and equatorial Pacific evaporative heat flux feedbacks involved in El Niño-Southern Oscillation (ENSO). A feedback decomposition method, based on the latent heat flux bulk formula, is implemented to enable identification of underlying causes of feedback bias and diversity from dynamical and thermodynamical processes. The magnitude of mean precipitation south of the equator in the east Pacific (an indicator of the extent of the double-ITCZ bias in a model) is linked to the mean meridional surface wind speed and direction in the region and is consequently linked to diversity in the strength of the wind speed response during the ENSO cycle. The ENSO latent heat flux damping is weak in almost all models and shows a relatively large range in strength in the CMIP5 ensemble. While both humidity gradient and wind speed feedbacks are important drivers of the damping, the wind speed feedback is an underlying cause of the overall damping bias for many models and is ultimately more dominant in driving interensemble variation. Feedback biases can also persist in atmosphere-only (AMIP) runs, suggesting that the atmosphere model plays an important role in latent heat flux damping and double-ITCZ bias and variation. Improvements to coupled model simulation of both mean precipitation and ENSO may be accelerated by focusing on the atmosphere component. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48758
Appears in Collections: 气候减缓与适应 气候变化与战略
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作者单位: College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, United Kingdom; Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing, China; Department of Atmospheric Science, School of Environmental Studies, China University of Geoscience, Wuhan, China; CMA-Nanjing University Joint Laboratory for Climate Prediction Studies, School of Atmospheric Sciences, Nanjing University, Nanjing, China
Recommended Citation:
Ferrett S.,Collins M.,Ren H.-L.. Understanding bias in the evaporative damping of El Niño-Southern Oscillation events in CMIP5 models[J]. Journal of Climate,2017-01-01,30(16)