Losada T. auteur aut IRD Rodriguez-Fonseca B. auteur aut IRD Janicot Serge auteur aut IRD Gervois S. auteur aut IRD Chauvin F. auteur aut IRD Ruti P. auteur aut IRD text journalArticle eng text/pdf born digital access This paper is focused on the West African anomalous precipitation response to an Atlantic Equatorial mode whose origin, development and damping resembles the observed one during the last decades of the XXth century. In the framework of the AMMA-EU project, this paper analyses the atmospheric response to the Equatorial mode using a multimodel approach with an ensemble of integrations from 4 AGCMs under a time varying Equatorial SST mode. The Guinean Gulf precipitation, which together with the Sahelian mode accounts for most of the summer West African rainfall variability, is highly coupled to this Equatorial Atlantic SST mode or Atlantic Nio. In a previous study, done with the same models under 1958-1997 observed prescribed SSTs, most of the models identify the Equatorial Atlantic SST mode as the one most related to the Guinean Gulf precipitation. The models response to the positive phase of equatorial Atlantic mode (warm SSTs) depicts a direct impact in the equatorial Atlantic, leading to a decrease of the local surface temperature gradient, weakening the West African Monsoon flow and the surface convergence over the Sahel. specialized West African Monsoon Tropical Atlantic variability Tropical teleconnections 032 021 35 1 29-43 2010 0930-7575 https://www.documentation.ird.fr/hor/fdi:010049599 10.1007/s00382-009-0625-5 0930-7575 [F B010049599] https://www.documentation.ird.fr/hor/fdi:010049599 https://www.documentation.ird.fr/intranet/publi/2010/07-2/010049599.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2010-08-03 2017-08-23 fdi:010049599 fre