Use of CHIRPS Data to Characterize Rainfall in West Africa: Case of the Poro Region in Côte d'Ivoire

Abstract

The climatic variability observed during the last decades in West Africa results in a decrease of the rainfall that influenced resources more thus in water and lively cultural the food insecurity, the desertification, the farming exodus. Him in default not less for the Coast of Ivory. So, data of stations rainfall knew a flight, but he/it is that they are limited because of their slant and their spatial cover that don't cover the whole country. A new data set combining data of satellite and stations of observation permits a better precision in the climatic variability survey. The methods of Nicholson and filter low pass of Hanning of order 2 permitted to identify the showing a deficit and excess years. In the region of Poro two climatic periods have been identified, a period of drought of 1981 to 1993 and a humid period of 1994 to 2014. For more of precision, on a daily scale, the method of number of dry consecutive days (Consecutive Dry Days) permitted to determine the episodes of drought. The decade 1981-1990 knew a strong drought with more of 70 dry days. On the other hand, the last decade 2001-2010 marks a resumption of rains. What entails a decrease of the number of dry days in the region of Poro.