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DOI | 10.1007/s00382-016-3156-x |
Impact of GCM boundary forcing on regional climate modeling of West African summer monsoon precipitation and circulation features | |
Kebe, Ibourahima1,2; Sylla, Mouhamadou Bamba2; Omotosho, Jerome Adebayo1,3; Nikiema, Pinghouinde Michel1,2; Gibba, Peter1,2; Giorgi, Filippo4 | |
2017-03-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 48 |
文章类型 | Article |
语种 | 英语 |
国家 | Nigeria; Burkina Faso; Italy |
英文摘要 | In this study, the latest version of the International Centre for Theoretical Physics Regional Climate Model (RegCM4) driven by three CMIP5 Global Climate Models (GCMs) is used at 25 km grid spacing over West Africa to investigate the impact of lateral boundary forcings on the simulation of monsoon precipitation and its relationship with regional circulation features. We find that the RegCM4 experiments along with their multimodel ensemble generally reproduce the location of the main precipitation characteristics over the region and improve upon the corresponding driving GCMs. However, the provision of different forcing boundary conditions leads to substantially different precipitation magnitudes and spatial patterns. For instance, while RegCM4 nested within GFDL-ESM-2M and HadGEM2-ES exhibits some underestimations of precipitation and an excessively narrow Intertropical Convergence Zone, the MPI-ESM-MR driven run produces precipitation spatial distribution and magnitudes more similar to observations. Such a superior performance originates from a much better simulation of the interactions between baroclinicity, temperature gradient and African Easterly Jet along with an improved connection between the Isentropic Potential Vorticity, its gradient and the African Easterly Waves dynamics. We conclude that a good performing GCM in terms of monsoon dynamical features (in this case MPI-ESM-MR) is needed to drive RCMs in order to achieve a better representation of the West Africa summer monsoon precipitation. |
英文关键词 | Monsoon precipitation Regional climate models Boundary forcing Circulation dynamics |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000395060900007 |
WOS关键词 | PHASE-I CREMA ; EASTERLY JET ; INTERANNUAL VARIABILITY ; WAVE DISTURBANCES ; CORDEX DOMAINS ; NORTH-AFRICA ; ANNUAL CYCLE ; SIMULATIONS ; CONVECTION ; TEMPERATURE |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35830 |
专题 | 气候变化 |
作者单位 | 1.Fed Univ Technol Akure, Grad Res Program West African Climate Syst, West African Sci Serv Ctr Climate Change & Adapte, Akure, Nigeria; 2.WASCAL Competence Ctr, West African Sci Serv Ctr Climate Change & Adapte, Ouagadougou, Burkina Faso; 3.Fed Univ Technol Akure, Dept Meteorol & Climate Sci, Akure, Nigeria; 4.Abdus Salam Int Ctr Theoret Phys ICTP, ESP Sect, Trieste, Italy |
推荐引用方式 GB/T 7714 | Kebe, Ibourahima,Sylla, Mouhamadou Bamba,Omotosho, Jerome Adebayo,et al. Impact of GCM boundary forcing on regional climate modeling of West African summer monsoon precipitation and circulation features[J]. CLIMATE DYNAMICS,2017,48. |
APA | Kebe, Ibourahima,Sylla, Mouhamadou Bamba,Omotosho, Jerome Adebayo,Nikiema, Pinghouinde Michel,Gibba, Peter,&Giorgi, Filippo.(2017).Impact of GCM boundary forcing on regional climate modeling of West African summer monsoon precipitation and circulation features.CLIMATE DYNAMICS,48. |
MLA | Kebe, Ibourahima,et al."Impact of GCM boundary forcing on regional climate modeling of West African summer monsoon precipitation and circulation features".CLIMATE DYNAMICS 48(2017). |
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