globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-016-3206-4
Scopus记录号: 2-s2.0-84975117220
论文题名:
Impact of the Madden Julian Oscillation on the summer West African monsoon in AMIP simulations
作者: Niang C.; Mohino E.; Gaye A.T.; Omotosho J.B.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 48, 期:2017-07-08
起始页码: 2297
结束页码: 2314
语种: 英语
英文关键词: AMIP simulations ; Madden Julian Oscillation ; Summer rainfall ; West Africa
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. © 2016, Springer-Verlag Berlin Heidelberg.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53295
Appears in Collections:过去全球变化的重建

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作者单位: Laboratoire de Physique de l’Atmosphère et de l’Océan Siméon Fongang (LPAO-SF), Ecole Supérieure Polytechnique (ESP), Université Cheikh Anta Diop, BP 5085, Dakar-Fann, Senegal; Instituto de Geociencias (IGEO), Agencia Estatal Consejo Superior de Investigaciones Cientificas CSIC, Madrid, Spain; Departamento de Fisica de la Tierra, Astronomia y Astrofisica I, Geofisica y Meteorologia, Universidad Complutense de Madrid (UCM), Madrid, Spain; WASCAL, Department of Meteorology, Federal University of Technology Akure, Ondo State, Nigeria; Instituto de Ciencias Matematicas, CSIC-UAM-UC3M-UCM, C/Nicolas Cabrera 15, Campus Cantoblanco UAM, Madrid, Spain

Recommended Citation:
Niang C.,Mohino E.,Gaye A.T.,et al. Impact of the Madden Julian Oscillation on the summer West African monsoon in AMIP simulations[J]. Climate Dynamics,2017-01-01,48(2017-07-08)
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