Caractérisation intra-annuelle de la variabilité climatique en Côte d’Ivoire

Abstract

The objective of this work to analyze the impacts of climate change on seasonal weather patterns in Ivory Coast. The study was based on a monthly rainfall and thermometric database recorded at nine synoptic stations representing the main climatic regimes of the Ivory Coast. These data cover the period 1941-2016. The methodology adopted is based on the use of climatic indices (Angot index, Péguy index, Moral index, UNEP index) for the study of climate dynamics on an intra-annual scale. The results of the study showed that the seasonal and intra-annual climate in Ivory Coast underwent changes from the period before 1970 to the period after 1970. Indeed, the character "the cold semester is more watered that the hot semester” is more pronounced in the period before 1970 than in the period after 1970 with a tendency for the hottest semesters to be relatively more watered after 1970 in some localities. The period before 1970 records the three consecutive rainiest months with a change in the wettest quarter, that is observed over the period after 1970 in certain stations studied. Across the Ivorian territory, certain climatic zones experienced a change in the rainy season after 1970 in terms of the start, end and duration months. However, the upheaval observed did not affect the type of climate in Ivory Coast. It remained subhumid and humid, despite the decrease in wetness after 1970.

Keywords

• Climate variability
• Ivory Coast
• Climatic indices
• Climatic regimes