Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-016-3206-4 |
Impact of the Madden Julian Oscillation on the summer West African monsoon in AMIP simulations | |
Niang, Coumba1,2,3,4,5; Mohino, Elsa3; Gaye, Amadou T.1; Omotosho, J. Bayo4 | |
2017-04-01 | |
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 | Senegal; Spain; Nigeria |
英文摘要 | At intraseasonal timescales, convection over West Africa is modulated by the Madden Julian Oscillation (MJO). In this work we investigate the simulation of such relationship by 11 state-of-the-art atmospheric general circulation models runs with prescribed observed sea surface temperatures. In general, the Atmospheric Model Intercomparison Project simulations show good skill in capturing the main characteristics of the summer MJO as well as its influence on convection and rainfall over West Africa. Most models simulate an eastward spatiotemporal propagation of enhanced and suppressed convection similar to the observed MJO, although their signal over West Africa is weaker in some models. In addition, the ensemble average of models' composites gives a better performance in reproducing the main features and timing of the MJO and its impact over West Africa. The influence on rainfall is well captured in both Sahel and Guinea regions thereby adequately producing the transition between positive and negative rainfall anomalies through the different phases as in the observations. Furthermore, the results show that a strong active convection phase is clearly associated with a stronger African Easterly Jet (AEJ) but the weak convective phase is associated with a much weaker AEJ. Our analysis of the equatorial waves suggests that the main impact over West Africa is established by the propagation of low-frequency waves within the MJO and Rossby spectral peaks. Results from the simulations confirm that it may be possible to predict anomalous convection over West Africa with a time lead of 15-20 day. |
英文关键词 | Madden Julian Oscillation Summer rainfall West Africa AMIP simulations |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000398926400012 |
WOS关键词 | GENERAL-CIRCULATION MODELS ; COUPLED EQUATORIAL WAVES ; INTRASEASONAL VARIABILITY ; KELVIN WAVES ; CONVECTION ; CLIMATE ; MJO ; PRECIPITATION ; MODULATION ; PACIFIC |
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/35226 |
专题 | 气候变化 |
作者单位 | 1.Univ Cheikh Anta Diop, LPAO SF, ESP, BP 5085, Dakar, Senegal; 2.Agencia Estatal Consejo Super Invest Cient CSIC, Inst Geociencias IGEO, Madrid, Spain; 3.Univ Complutense Madrid, Dept Fis Tierra Astron & Atrofis 1, Geofis & Meteorol, Madrid, Spain; 4.Fed Univ Technol Akure, Dept Meteorol, WASCAL, Akure, Ondo State, Nigeria; 5.CSIC UAM UC3M UCM, Inst Ciencias Matemat, C Nicolas Cabrera 15,Campus Cantoblanco UAM, Madrid 28049, Spain |
推荐引用方式 GB/T 7714 | Niang, Coumba,Mohino, Elsa,Gaye, Amadou T.,et al. Impact of the Madden Julian Oscillation on the summer West African monsoon in AMIP simulations[J]. CLIMATE DYNAMICS,2017,48. |
APA | Niang, Coumba,Mohino, Elsa,Gaye, Amadou T.,&Omotosho, J. Bayo.(2017).Impact of the Madden Julian Oscillation on the summer West African monsoon in AMIP simulations.CLIMATE DYNAMICS,48. |
MLA | Niang, Coumba,et al."Impact of the Madden Julian Oscillation on the summer West African monsoon in AMIP simulations".CLIMATE DYNAMICS 48(2017). |
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