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« Variabilité et tendance climatiques. Quelles options d’adaptation pertinente pour les ruraux en zone sahelienne ? »

The climate data used in this study were collected at the weather stations of Bambey, Kaolack, Kolda and Tambacounda (in the period from 1950 to 2010) and relate to the maximum daily temperature and minimum daily temperatures. Most of the analyzes are focus on the days and nights climatologically hot and cold, and in order to define the overall trend of climate change in the region, but also make a comparison with the overall trends observed in the other stations in West Africa. Thus, our analyses show that the frequency of climatological cold days (Tx10p) decreased but not significantly (Bambey, the most northern station and most closer to the océan Bambey and Tambacounda, station the higher altitude), while that of climatological warm days (Tx90p) increases significantly (in Kaolack, Tambacounda and Kolda, all continental, with p-value lower to 0.0001). Similarly, the climatological cold nights (Tn10p) and climatological warm nights (Tn90p) have a tendency to significant change in threshold of 95%: decrease of Tn10p in the stations of Bambey, Kaolack and Tamabacounda, with a value slope between -0.3 and -0.6 %. Conversely, Tn90p knows a significant increase in all the stations studied. These trends reflect acceleration to global warming harmful to human structures, including the agricultural, main activity of populations. This work allows, dice when fully understand the question but also to see how the results observed in the groundnut basin are similar to those of other stations in the West African sub-region (for which an increase is observed from 0, 2 ° C to 0.8 ° C per decade since the late 1970s in areas Sahel-Saharan, Sahelian and Sudanian).

Auteur(s) : FAYE G., Mbaye DIOUF E., BADIANE S.D., YANON G., NDIAYE A.,
Pages : 15
Année de publication : 2016
Revue : Espaces et Sociétés en mutation
N° de volume : 1
Type : Article
Mise en ligne par : NDIAYE Aminata