Bamba A., Diallo I., Toure N. E., Kouadio K., Konare A., Drame M. S., Diedhiou Arona, Silue S., Doumbia M., Tall M. (2019). Effect of the African greenbelt position on West African summer climate : a regional climate modeling study. Theoretical and Applied Climatology, 137 (1-2), p. 309-322. ISSN 0177-798X.
Titre du document
Effect of the African greenbelt position on West African summer climate : a regional climate modeling study
Année de publication
2019
Auteurs
Bamba A., Diallo I., Toure N. E., Kouadio K., Konare A., Drame M. S., Diedhiou Arona, Silue S., Doumbia M., Tall M.
Source
Theoretical and Applied Climatology, 2019,
137 (1-2), p. 309-322 ISSN 0177-798X
This modeling study is conducted to examine the potential impact of the reforestation (greenbelt) location (either in Sahel or in Guinean region) on West Africansummer climate system. To this end, three simulations using the regional climate model RegCM4 driven by ERA-Interim reanalysis were performed at 50km horizontal resolution over a West African domain for the period 2000-2011. The first experiment, namely the control (CTRL), uses the standard vegetation cover, while the two others incorporate throughout the model integration, a zonal reforestation band of evergreen broadleaf over different locations: (i) over a 13 degrees N-17 degrees N band latitudes in a Sahel-Sahara region (experiment hereafter referred to as GB15N) and (ii) between 8.5 degrees N-11.5 degrees N in the Guinea Coast region (experiment hereafter referred to as GB10N). A comparison of the CTRL experiment with observation reveals a faithful reproduction of the mean boreal and summer seasonal precipitation pattern, though substantial dry/wet biases remain, especially in the Atlantic Ocean. In addition, the seasonal cycle over sub-regions matches satisfactory the observed pattern. The GB15N reforestation leads to a precipitation increase in the range of 2-4mm/day over the forested areas, whereas in the GB10N reforestation, precipitation increase is weaker and not necessarily located in the forested areas. Temperature cooling is observed over the reforested area and may be explained by a decrease of ground heat flux related to a reduction of the surface albedo.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
;
Sciences du milieu [021]
;
Etudes, transformation, conservation du milieu naturel [082]
Description Géographique
AFRIQUE DE L'OUEST ; SAHEL ; SAHARA ; GUINEE GOLFE
Localisation
Fonds IRD [F B010076482]
Identifiant IRD
fdi:010076482
