[ Variabilité climatique récente en Côte d’Ivoire (1981-2025) ]
Volume 83, Issue 2, March 2026, Pages 217–228
Kouassi Kouakou Alain François1, Zonkouan-Kouame Badjo Ruth Virginia2, Coulibaly Kolotioloma Alama3, and Dibi-Anoh Agoh Pauline4
1 Institut de Géographie Tropicale, Université Félix Houphouët Boigny, Abidjan, Côte d’Ivoire
2 Institut de Géographie Tropicale, Université Félix Houphouët Boigny, Abidjan, Côte d’Ivoire
3 Institut de Géographie Tropicale, Université Félix Houphouët Boigny, Abidjan, Côte d’Ivoire
4 Institut de Géographie Tropicale, Université Félix Houphouët Boigny, Abidjan, Côte d’Ivoire
Original language: French
Copyright © 2026 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This study analyzes the evolution of the Ivorian climate between 1981 and 2025. It relies on CORDEX data derived from five regional climate models and 14 stations distributed across the country. The series were processed using the Hanning low-pass filter, standardized anomalies, the Pettitt test combined with the Bayesian approach of Lee and Heghinian, and the Hydro-Environmental Deficit Index (IDDH). The results first reveal a generalized increase in rainfall. However, a marked deficit period occurred between 1990 and 2014. Since 2014, most stations have shown a clear recovery. In parallel, temperatures have risen across the entire territory, with a stronger intensity along the coastline. Moreover, recent rainfall shifts are associated with substantial positive variations, exceeding 20% in coastal and forest zones. Rainy seasons have intensified in most stations, although Korhogo, Bouaké, and Yamoussoukro remain exceptions. Finally, monthly temperature increases are widespread, with a particularly strong rise during the dry season in the northern part of the country.
Author Keywords: Côte d’Ivoire, rainfall, temperature, climate.
Volume 83, Issue 2, March 2026, Pages 217–228
Kouassi Kouakou Alain François1, Zonkouan-Kouame Badjo Ruth Virginia2, Coulibaly Kolotioloma Alama3, and Dibi-Anoh Agoh Pauline4
1 Institut de Géographie Tropicale, Université Félix Houphouët Boigny, Abidjan, Côte d’Ivoire
2 Institut de Géographie Tropicale, Université Félix Houphouët Boigny, Abidjan, Côte d’Ivoire
3 Institut de Géographie Tropicale, Université Félix Houphouët Boigny, Abidjan, Côte d’Ivoire
4 Institut de Géographie Tropicale, Université Félix Houphouët Boigny, Abidjan, Côte d’Ivoire
Original language: French
Copyright © 2026 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
This study analyzes the evolution of the Ivorian climate between 1981 and 2025. It relies on CORDEX data derived from five regional climate models and 14 stations distributed across the country. The series were processed using the Hanning low-pass filter, standardized anomalies, the Pettitt test combined with the Bayesian approach of Lee and Heghinian, and the Hydro-Environmental Deficit Index (IDDH). The results first reveal a generalized increase in rainfall. However, a marked deficit period occurred between 1990 and 2014. Since 2014, most stations have shown a clear recovery. In parallel, temperatures have risen across the entire territory, with a stronger intensity along the coastline. Moreover, recent rainfall shifts are associated with substantial positive variations, exceeding 20% in coastal and forest zones. Rainy seasons have intensified in most stations, although Korhogo, Bouaké, and Yamoussoukro remain exceptions. Finally, monthly temperature increases are widespread, with a particularly strong rise during the dry season in the northern part of the country.
Author Keywords: Côte d’Ivoire, rainfall, temperature, climate.
Abstract: (french)
Cette étude analyse l’évolution du climat ivoirien entre 1981 et 2025. Elle s’appuie sur les données CORDEX, issues de cinq modèles climatiques régionaux et de 14 stations réparties sur le territoire. Les séries ont été traitées à l’aide du filtre de Hanning, des indices centrés réduits, du test de Pettitt avec l’approche bayésienne de Lee et Heghinian, ainsi que des indices IDDH. Les résultats montrent d’abord une hausse généralisée de la pluviométrie. Toutefois, une forte période déficitaire apparaît entre 1990 et 2014. Depuis 2014, la plupart des stations enregistrent une reprise de la pluviométrie. Parallèlement, les températures augmentent sur tout le territoire, avec une intensité plus marquée sur le littoral. De plus, les ruptures pluviométriques récentes s’accompagnent de variations positives importantes, dépassant 20 % en zone littorale et forestière. Les saisons pluvieuses se renforcent dans la majorité des stations, bien que Korhogo, Bouaké et Yamoussoukro fassent exception. Enfin, l’augmentation thermique mensuelle est généralisée, particulièrement durant la saison sèche dans le Nord du pays.
Author Keywords: Côte d’Ivoire, pluviométrie, température, climat.
How to Cite this Article
Kouassi Kouakou Alain François, Zonkouan-Kouame Badjo Ruth Virginia, Coulibaly Kolotioloma Alama, and Dibi-Anoh Agoh Pauline, “Recent climatic variability in Côte d’Ivoire (1981-2025),” International Journal of Innovation and Scientific Research, vol. 83, no. 2, pp. 217–228, March 2026.
