globalchange  > 气候减缓与适应
DOI: 10.1002/joc.5740
论文题名:
Low-level circulation and precipitation simulated by CMIP5 GCMS over southeastern South America
作者: Barros V.R.; Doyle M.E.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期:15
起始页码: 5476
结束页码: 5490
语种: 英语
英文关键词: CMIP5 ; precipitation ; principal component analysis ; SESA ; stream function
Scopus关键词: Precipitation (chemical) ; Principal component analysis ; Rain ; CMIP5 ; Coupled modeling ; Global climate model ; Mean precipitation ; SESA ; Southeastern South America ; Southern Brazil ; Streamfunctions ; Climate models ; atmospheric general circulation model ; CMIP ; precipitation (climatology) ; principal component analysis ; rainfall ; Andes ; Argentina ; Brazil ; Uruguay
英文摘要: Global climate models (GCMs) have, in general, problems representing precipitation over southern southeastern South America (SSESA), namely southern Brazil, Uruguay and eastern Argentina. In this study, 18 models were selected from the Coupled Model Inter-comparison Project Phase 5 to evaluate rainfall of the warm semester (October–March) when most of the rain takes place. Though GCMs reproduce the main features of the two main low-level circulation variability modes over southeastern South America, east of the Andes, particularly the two flow patterns associated with the active and weak SACZ, most of them underestimate the northern flow that brings water vapour into SSESA, as well as the mean precipitation in this region. According to an index that stands for the northern flow towards SSESA, all models, except one, have lower northern flow into SSESA than the observed reanalysis field. In addition, this index has a significant correlation across GCMs with mean SSESA precipitation, indicating that lower northern flow into SSESA is generally associated with a greater underestimation in the model precipitation. Hence, it is concluded that the weaker northern flow into SSESA simulated by most GCMs is a cause of their simulated lower precipitation in this region. © 2018 Royal Meteorological Society
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116712
Appears in Collections:气候减缓与适应

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作者单位: Centro de Investigaciones del Mar y la Atmósfera (CIMA, CONICET-UBA-UMIIFAECI), Departamento de Ciencias de la Atmósfera y los Océanos – Universidad de Buenos Aires, Buenos Aires, Argentina

Recommended Citation:
Barros V.R.,Doyle M.E.. Low-level circulation and precipitation simulated by CMIP5 GCMS over southeastern South America[J]. International Journal of Climatology,2018-01-01,38(15)
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