Bichet Adeline auteur aut IRD Diedhiou Arona auteur aut IRD Hingray B. auteur aut IRD Evin G. auteur aut IRD Toure N. E. auteur aut IRD Browne K. N. A. auteur aut IRD Kouadio K. auteur aut IRD text journalArticle eng text/pdf reformatted digital access Over the past decades, large variations of precipitation were observed in Africa, which often led to dramatic consequences for local society and economy. To avoid such disasters in the future, it is crucial to better anticipate the expected changes, especially in the current context of climate change and population growth. To this date, however, projections of precipitation over Africa are still associated with very large uncertainties. To better understand how this uncertainty can be reduced, this study uses an advanced Bayesian analysis of variance (ANOVA) method to characterize, for the first time in the regional climate projections of CORDEX-AFRICA, the different sources of uncertainty associated with the projections of precipitation over Africa. By 2090, the ensemble mean precipitation is projected to increase over the Horn of Africa from September to May and over the eastern Sahel and Guinea Coast from June to November. It is projected to decrease over the northern coast and southern Africa all year long, over western Sahel from March to August, and over the Sahel and Guinea Coast from March to May. Most of these projections however are not robust, i.e., the magnitude of change is smaller than the associated uncertainty. Over time, the relative contribution of internal variability (excluding interannual variability) to total uncertainty is moderate and quickly falls below 10%. By 2090, it is found that over the Horn of Africa, northern coast, southern Africa, and Sahel, most of the uncertainty results from a large dispersion across the driving Global Climate Models (in particular MIROC, CSIRO, CCCma, and IPSL), whereas over the tropics and parts of eastern Africa, most of the uncertainty results from a large dispersion across Regional Climate Models (in particular CLMcom). specialized CORDEX-AFRICA Precipitation Bayesian ANOVA Model uncertainty Internal variability AFRIQUE 021 062 020 162 2 583-601 2020 0165-0009 https://www.documentation.ird.fr/hor/fdi:010079693 10.1007/s10584-020-02833-z 0165-0009 [F B010079693] https://www.documentation.ird.fr/hor/fdi:010079693 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-09/010079693.pdf IRD - Base Horizon / Pleins textes 2020-10-09 2025-02-24 fdi:010079693 fre