DOI: 10.1007/s00382-014-2389-9
Scopus记录号: 2-s2.0-84939947391
论文题名: Impacts of variations in the strength and structure of El Niño events on Pacific rainfall in CMIP5 models
作者: Murphy B.F. ; Ye H. ; Delage F.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 44, 期: 2017-11-12 起始页码: 3171
结束页码: 3186
语种: 英语
英文关键词: Climate variability
; CMIP5
; El Niño
; Pacific rainfall
英文摘要: El Niño-Southern Oscillation (ENSO) plays a dominant role in interannual climate variability in Pacific island countries, directly affecting lives there. Many countries show different rainfall responses depending on the sea surface temperature (SST) structure of different types of El Nino events. El Niño events are classified into three types based on previous studies: those with strongest SST anomalies in the eastern Pacific Cold Tongue region (CTE), in the Western Pacific Warm Pool region (WPE), and those in between, a “Mixed” El Niño (MxE), and results from 30 CMIP5 models are investigated. These models accurately reproduce observed SST and precipitation anomalies for the three El Niño types and La Niña. CMIP5 models simulate much larger ranges in the strength of ENSO events than observed. Results clarify the roles of both the different structures of El Niño SST anomalies and their magnitudes on rainfall in the Pacific, and demonstrate that each of the three El Niño types has different impacts on rainfall in the region. These impacts vary with location, with WPE and CTE producing very different impacts in most Pacific island countries. There is a linear intensification of both the mean and maximum rainfall anomalies in the equatorial Pacific as the events become stronger. Equatorial rainfall shifts eastward in CTE and MxE, westward in La Niña. Both the South Pacific and Intertropical Convergence Zones (SPCZ and ITCZ) shift equatorward in El Niño and poleward in La Niña, the shifts increasing as events strengthen. WPE show different behaviour to other events, with little east-west shift in equatorial rainfall, and the orientation angle of the convergence zones increases. Identification of models with no erroneous westward bias in SST anomalies has clarified the effect of strong CTE events producing “zonal” SPCZ and shifting rainfall away to the east from western equatorial countries. © 2014, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54122
Appears in Collections: 过去全球变化的重建
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作者单位: Centre for Australian Weather and Climate Research, Bureau of Meteorology, Melbourne, VIC, Australia
Recommended Citation:
Murphy B.F.,Ye H.,Delage F.. Impacts of variations in the strength and structure of El Niño events on Pacific rainfall in CMIP5 models[J]. Climate Dynamics,2015-01-01,44(2017-11-12)