DOI: 10.1007/s00382-015-2480-x
Scopus记录号: 2-s2.0-84946474311
论文题名: The impact of ENSO on Southern African rainfall in CMIP5 ocean atmosphere coupled climate models
作者: Dieppois B. ; Rouault M. ; New M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 45, 期: 2017-09-10 起始页码: 2425
结束页码: 2442
语种: 英语
英文关键词: CMIP5
; Coupled model
; El Niño Southern Oscillation (ENSO)
; Rainfall
; Southern Africa
; Teleconnection
英文摘要: We study the ability of 24 ocean atmosphere global coupled models from the Coupled Model Intercomparison Project 5 (CMIP5) to reproduce the teleconnections between El Niño Southern Oscillation (ENSO) and Southern African rainfall in austral summer using historical forced simulations, with a focus on the atmospheric dynamic associated with El Niño. Overestimations of summer rainfall occur over Southern Africa in all CMIP5 models. Abnormal westward extensions of ENSO patterns are a common feature of all CMIP5 models, while the warming of the Indian Ocean that happens during El Niño is not correctly reproduced. This could impact the teleconnection between ENSO and Southern African rainfall which is represented with mixed success in CMIP5 models. Large-scale anomalies of suppressed deep-convection over the tropical maritime continent and enhanced convection from the central to eastern Pacific are correctly simulated. However, regional biases occur above Africa and the Indian Ocean, particularly in the position of the deep convection anomalies associated with El Niño, which can lead to the wrong sign in rainfall anomalies in the northwest part of South Africa. From the near-surface to mid-troposphere, CMIP5 models underestimate the observed anomalous pattern of pressure occurring over Southern Africa that leads to dry conditions during El Niño years. © 2015, Springer-Verlag Berlin Heidelberg. 资助项目: NRF, Water Research Commission
; WRC, Water Research Commission
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53947
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: African Climate and Development Initiative, University of Cape Town, Cape Town, South Africa; Department of Oceanography, MARE Institute, University of Cape Town, Cape Town, South Africa; Nansen-Tutu Center for Marine Environmental Research, University of Cape Town, Cape Town, South Africa
Recommended Citation:
Dieppois B.,Rouault M.,New M.. The impact of ENSO on Southern African rainfall in CMIP5 ocean atmosphere coupled climate models[J]. Climate Dynamics,2015-01-01,45(2017-09-10)