Janicot Serge auteur aut IRD Caniaux G. auteur aut IRD Chauvin F. auteur aut IRD de Coëtlogon G. auteur aut IRD Fontaine B. auteur aut IRD Hall N. auteur aut IRD Kiladis G. auteur aut IRD Lafore J. P. auteur aut IRD Lavaysse C. auteur aut IRD Lavender S. L. auteur aut IRD Leroux S. auteur aut IRD Marteau R. auteur aut IRD Mounier F. auteur aut IRD Philippon N. auteur aut IRD Roehrig R. auteur aut IRD Sultan Benjamin auteur aut IRD Taylor C. M. auteur aut IRD text journalArticle eng text/pdf born digital access The intraseasonal time scale is critical in West Africa where resources are highly rainfall dependent. Three main modes of variability have been identified, two with a mean periodicity of 15 days and one with a mean periodicity around 40 days. These modes have a regional scale and can strongly influence precipitation and convective activity. They are mainly controlled by atmospheric dynamics and land-surface interactions. They can also modulate the very specific phase of the African summer monsoon onset. A better knowledge of the mechanisms controlling this scale is necessary to improve its predictability. Copyright. specialized West African monsoon intraseasonal variability monsoon onset predictability crop yield 021 032 12 1 58-66 2011 1530-261X https://www.documentation.ird.fr/hor/fdi:010053181 10.1002/asl.280 1530-261X [F B010053181] https://www.documentation.ird.fr/hor/fdi:010053181 https://www.documentation.ird.fr/intranet/publi/2011/03/010053181.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2011-04-07 2017-08-23 fdi:010053181 fre