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Communication incl. Poster: BibTeX citation key:  Kouassi
Kouassi, A., Assamoi, P., Schayes, G., Diawara, A., Yoroba, F. & Kouassi, B. 2009. Modeling the effects of deforestation on the climate in West Africa with the Regional Atmospheric Model (MAR). Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: roussot 2009-11-05 14:09:06
Categories: Land surface-atmosphere feedback, Society-Environment-Climate interactions, Weather to Climatic modelling and forecasting
Keywords: Modelling
Creators: Assamoi, Diawara, Kouassi, Kouassi, Schayes, Yoroba
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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The high resolution Regional Climate Model (RCM) is used to study the effects of deforestation on the tropical climate in West Africa. Two five years simulations are performed. A controlled one using the current land vegetation prescription and a deforestation one using land degradation prescription.
The results show variations of the climatic parameters at local-scale. It is also noted an increasing of the air temperature and a decreasing of the rainfall. Convective precipitations related to local processes are more effective than those at large-scale. However, the deforestation does not affect the seasonal cycle of precipitations over the West African zone. The analysis of the physical processes indicates that the decreasing of the rainfall may be related to two factors that are (i): the reduction of the surface energy fluxes which diminish the atmospheric lower layer instability and convections processes; (ii): the surface roughness attenuation due to deforestation that intensify the low-layer wind resulting to weakening moisture convergence and rainfall decrease over West Africa. Globally the moonson circulation is barely affected.
The main features of the West African regional circulation do not affect the African Eastern Jet (AEJ) nor the Tropical Eastern Jet (TEJ) when the simulation takes into account the deforestation. However, deforestation induces a decreasing of the vertical wind speed and tends to reduce drift and convective movement.
Added by: roussot