Rodriguez-Fonseca B. auteur aut IRD Mohino E. auteur aut IRD Mechoso C. R. auteur aut IRD Caminade C. auteur aut IRD Biasutti M. auteur aut IRD Gaetani M. auteur aut IRD Garcia-Serrano J. auteur aut IRD Vizy E. K. auteur aut IRD Cook K. auteur aut IRD Xue Y. K. auteur aut IRD Polo I. auteur aut IRD Losada T. auteur aut IRD Druyan L. auteur aut IRD Fontaine B. auteur aut IRD Bader J. auteur aut IRD Doblas-Reyes F. J. auteur aut IRD Goddard L. auteur aut IRD Janicot Serge auteur aut IRD Arribas A. auteur aut IRD Lau W. auteur aut IRD Colman A. auteur aut IRD Vellinga M. auteur aut IRD Rowell D. P. auteur aut IRD Kucharski F. auteur aut IRD Voldoire A. auteur aut IRD text journalArticle eng text/pdf born digital access The Sahel experienced a severe drought during the 1970s and 1980s after wet periods in the 1950s and 1960s. Although rainfall partially recovered since the 1990s, the drought had devastating impacts on society. Most studies agree that this dry period resulted primarily from remote effects of sea surface temperature (SST) anomalies amplified by local land surface-atmosphere interactions. This paper reviews advances made during the last decade to better understand the impact of global SST variability on West African rainfall at interannual to decadal time scales. At interannual time scales, a warming of the equatorial Atlantic and Pacific/Indian Oceans results in rainfall reduction over the Sahel, and positive SST anomalies over the Mediterranean Sea tend to be associated with increased rainfall. At decadal time scales, warming over the tropics leads to drought over the Sahel, whereas warming over the North Atlantic promotes increased rainfall. Prediction systems have evolved from seasonal to decadal forecasting. The agreement among future projections has improved from CMIP3 to CMIP5, with a general tendency for slightly wetter conditions over the central part of the Sahel, drier conditions over the western part, and a delay in the monsoon onset. The role of the Indian Ocean, the stationarity of teleconnections, the determination of the leader ocean basin in driving decadal variability, the anthropogenic role, the reduction of the model rainfall spread, and the improvement of some model components are among the most important remaining questions that continue to be the focus of current international projects. specialized AFRIQUE DE L'OUEST SAHEL ATLANTIQUE PACIFIQUE OCEAN INDIEN MEDITERRANEE ZONE EQUATORIALE 032 021 28 10 4034-4060 2015 0894-8755 https://www.documentation.ird.fr/hor/fdi:010064237 10.1175/jcli-d-14-00130.1 0894-8755 [F B010064237] https://www.documentation.ird.fr/hor/fdi:010064237 https://www.documentation.ird.fr/intranet/publi/2015/06/010064237.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2015-07-03 2017-08-23 fdi:010064237 fre