DOI: 10.1007/s00382-011-1002-8
Scopus记录号: 2-s2.0-84856256515
论文题名: Downscaling of South America present climate driven by 4-member HadCM3 runs
作者: Chou S.C. ; Marengo J.A. ; Lyra A.A. ; Sueiro G. ; Pesquero J.F. ; Alves L.M. ; Kay G. ; Betts R. ; Chagas D.J. ; Gomes J.L. ; Bustamante J.F. ; Tavares P.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 38, 期: 2017-03-04 起始页码: 635
结束页码: 653
语种: 英语
英文关键词: Climate simulation uncertainty
; Eta model
; Present climate
; Regional climate model
; South America
英文摘要: The objective of this work is to evaluate climate simulations over South America using the regional Eta Model driven by four members of an ensemble of the UK Met Office Hadley Centre HadCM3 global model. The Eta Model has been modified with the purpose of performing long-term decadal integrations and has shown to reproduce "present climate"-the period 1961-1990-reasonably well when forced by HadCM3. The global model lateral conditions with a resolution of 2.5° latitude × 3.75° longitude were provided at a frequency of 6 h. Each member of the global model ensemble has a different climate sensitivity, and the four members were selected to span the range of uncertainty encompassed by the ensemble. The Eta Model nested in the HadCM3 global model was configured with 40-km horizontal resolution and 38 layers in the vertical. No large-scale internal nudging was applied. Results are shown for austral summer and winter at present climate defined as 1961-90. The upper and low-level circulation patterns produced by the Eta-CPTEC/HadCM3 experiment set-up show good agreement with reanalysis data and the mean precipitation and temperature with CRU observation data. The spread in the downscaled mean precipitation and temperature is small when compared against model errors. On the other hand, the benefits in using an ensemble is clear in the improved representation of the seasonal cycle by the ensemble mean over any one realization. El Niño and La Niña years were identified in the HadCM3 member runs based on the NOAA Climate Prediction Center criterion of sea surface temperature anomalies in the Niño 3.4 area. The frequency of the El Niño and La Niña events in the studied period is underestimated by HadCM3. The precipitation and temperature anomalies typical of these events are reproduced by most of the Eta-CPTEC/HadCM3 ensemble, although small displacements of the positions of the anomalies occur. This experiment configuration is the first step on the implementation of Eta-CPTEC/HadCM3 upcoming experiments on climate change studies that are discussed in a companion paper. © 2011 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55388
Appears in Collections: 过去全球变化的重建
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作者单位: National Institute for Space Research (INPE), Cachoeira Paulista, São Paulo 12630-000, Brazil; UK Met Office Hadley Centre, FitzRoy Road, Exeter, Devon EX1 3PB, United Kingdom
Recommended Citation:
Chou S.C.,Marengo J.A.,Lyra A.A.,et al. Downscaling of South America present climate driven by 4-member HadCM3 runs[J]. Climate Dynamics,2012-01-01,38(2017-03-04)