DOI: 10.1007/s00382-016-3189-1
Scopus记录号: 2-s2.0-84973146894
论文题名: Understanding the double peaked El Niño in coupled GCMs
作者: Graham F.S. ; Wittenberg A.T. ; Brown J.N. ; Marsland S.J. ; Holbrook N.J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 48, 期: 2017-05-06 起始页码: 2045
结束页码: 2063
语种: 英语
英文关键词: Climate change
; CMIP5
; Cold tongue bias
; Coupled general circulation model
; El Niño evolution
英文摘要: Coupled general circulation models (CGCMs) simulate a diverse range of El Niño–Southern Oscillation behaviors. “Double peaked” El Niño events—where two separate centers of positive sea surface temperature (SST) anomalies evolve concurrently in the eastern and western equatorial Pacific—have been evidenced in Coupled Model Intercomparison Project version 5 CGCMs and are without precedent in observations. The characteristic CGCM double peaked El Niño may be mistaken for a central Pacific warming event in El Niño composites, shifted westwards due to the cold tongue bias. In results from the Australian Community Climate and Earth System Simulator coupled model, we find that the western Pacific warm peak of the double peaked El Niño event emerges due to an excessive westward extension of the climatological cold tongue, displacing the region of strong zonal SST gradients towards the west Pacific. A coincident westward shift in the zonal current anomalies reinforces the western peak in SST anomalies, leading to a zonal separation between the warming effect of zonal advection (in the west Pacific) and that of vertical advection (in the east Pacific). Meridional advection and net surface heat fluxes further drive growth of the western Pacific warm peak. Our results demonstrate that understanding historical CGCM El Niño behaviors is a necessary precursor to interpreting projections of future CGCM El Niño behaviors, such as changes in the frequency of eastern Pacific El Niño events, under global warming scenarios. © 2016, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53337
Appears in Collections: 过去全球变化的重建
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作者单位: Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart, TAS, Australia; National Oceanic and Atmospheric Administration, Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; CSIRO, Oceans and Atmosphere, Hobart, TAS, Australia; CSIRO, Oceans and Atmosphere, Aspendale, VIC, Australia; ARC Centre of Excellence for Climate System Science, Hobart, TAS, Australia
Recommended Citation:
Graham F.S.,Wittenberg A.T.,Brown J.N.,et al. Understanding the double peaked El Niño in coupled GCMs[J]. Climate Dynamics,2017-01-01,48(2017-05-06)