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Communication incl. Poster: BibTeX citation key:  YepdoDjomoua
Yepdo Djomou, Z., Monkam, D. & Lenouo, A. 2009. Detecting Change of Spatio-Temporal Variability of the Climatic Zones over West Africa during the last Century. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: roussot 2009-10-19 14:56:59    Last Edited by: roussot 2009-10-19 14:57:48
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Categories: Monsoon system and its variability, Weather to Climatic modelling and forecasting
Keywords: Climate
Creators: Lenouo, Monkam, Yepdo Djomou
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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Abstract
Climatic changes at the local/regional scale are probably among the most important issues within the global change debate. We propose to revisit the climatic zonation over West Africa and try to make our contribution on how the spatial variation of the climatic zones could contribute to a better illustration and understanding of climatic changes in this part of the African continent. By using CRU data, we also explore zonation, trends and spatial variability of the zones. Four regions spread in five areas are identified in West Africa for the base period 1901-1940. An analysis of observed temperature and precipitation variability and trends in these regions, shows that the trends have a magnitude of up to 1.5K per century with a decrease in the precipitation since the 1970s. To explore dynamic controls of spatial variability of the climatic zones, the application of a segment of 15 years with overlap going from the base period 1901–1940 (P0) to 1961–1998 (P4) throughout the periods 1916–1955 (P1), 1931–1970 (P2) and 1946–1985 (P3), shows that the spatiotemporal modifications of rainfall regions are more marked south of 15°N. For the region GI covering the Sahara, the surface during P4 is greater than in P0. In P4, the surface of region GII centred on the Chad, and including a large part of the semiarid land, is about double of P0, while that of GIII and GIV covering the West African coast and the wet equatorial land, respectively, are around half of P0.. Finally, the spatiotemporal evolution of the zones has been shown through the extension of dry climate zone (Sahara and Sahel) and the reduction of wet climate zone (coastal and equatorial regions).
Added by: roussot    Last Edited by: roussot