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Communication incl. Poster: BibTeX citation key:  Mougina
Mougin, E., Grippa, M., Hiernaux, P., Demarez, V., Kergoat, L., Le Dantec, V., Gruhier, C., De Rosnay, P., Trichon, V., Soumaguel, N., Diarra, L. & Koité, M. 2009. Vegetation dynamics over West-Africa during AMMA. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: Devic 2009-09-08 09:37:02    Last Edited by: roussot 2009-10-18 18:31:10
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Categories: Environment and Climate Monitoring, Land surface processes
Keywords: Vegetation
Creators: Demarez, Diarra, Grippa, Gruhier, Hiernaux, Kergoat, Koité, Le Dantec, Mougin, De Rosnay, Soumaguel, Trichon
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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Abstract
From the late 1960s, West Africa has experienced chronic below average annual rainfall although a return to wetter conditions has been observed in the last two decades in parts of West-Africa. This long dry period has been punctuated by major droughts that occurred throughout the region in 1972-73 and in 1983-84 with dramatic consequences on water resources and on vegetation cover that triggered soil erosion and massive losses in livestock and aggravated population poverty.
The response at different temporal scales of vegetation to chronic (multi-year) dry conditions and acute (single year) droughts experienced in the Sahel remain questioned. Related to this question is a continuing controversy on the interpretation given to the inter-annual variations in Rain Use Efficiency (RUE) indices either calculated from field data, or from satellite data using NDVI statistics and rain estimates.
Long term trends, inter-annual and seasonal variations of vegetation cover as seen by satellite observations over West Africa are presented and discussed for the 1982-2007 period. These variations are interpreted with the help of rainfall maps, RUE maps, and for the recent years with soil moisture maps obtained from satellite observations. From local to meso-scales, field data acquired over the AMMA-CATCH sites are of primary importance to correctly interpret remote sensing observations.
Added by: roussot