Search results for "MC"
showing 10 items of 2122 documents
Some aspects of water balance indicators in Western Central Africa: example of the savannas in the Niari valley (Congo)
2005
Shrubby savannas of the Niari valley are an ecosystem form that have a weak predisposition to evapotranspirate water in the atmosphere. They seem to be a “reducing” environment of energy transformation. The interactions of the soil-vegetation-atmosphere system seem to be largely dependent of surface conditions. What mostly explains the weakness of recycled moisture over this local area (at a local space scale). That partly leads to a high variability of the field capacity which fluctuates between one and five months. Moreover, shrubby savannas of the Niari valley are characterized by a continuous seasonal dryness. It is the result of a climatic azonality characterized by weak rains combined…
L'étude du climat du siècle à venir : Des enjeux, des données et des techniques parfois spécifiques. Application au phénomène ENSO et aux précipitati…
2005
Statistical analyses of the impact of climatic parameters on the vectors of Malaria over West-Africa
2005
Etude de la variabilité du bilan hydrologique dans le bassin de la Sota (Bénin, Afrique de l'ouest)
2004
Vulnérabilité des espaces maïsicoles à la péjoration climatique en Afrique Guinéenne : le cas du Bénin
2006
Interannual memory effects of vegetation in semi-arid Africa
2006
Over 15 years of Normalized Difference Vegetation Index (NDVI) data from the Advanced Very High Resolution Radiometers (AVHRR) are used to study the response of vegetation activity to rainfall in three semi-arid regions of Africa, diversified in terms of geography (Western, Southern and Eastern Africa), topography, rainfall regime and vegetation. The relationships between annual NDVI and annual precipitation (PPT) time series are examined using statistical approaches (simple and partial correlations, linear multiple regressions). It appears that annual NDVI highly depends on PPT of the concurrent year and the previous year. An analysis of particularly dry and wet years enables to better dia…