Abstract
The rainfall variability in time and space is very-high in the sahelian zone , it can occur in the whole West Africa. Dry or wet spells are recurrent phenomena. The drought of 1968 -1982, culminating in 1972 -1973 and once more in 1982 , exceeds all the previous drought episods in magnitude and spatial involvement. In order to understand climatic change and rainfall variability, the data required concern not merely the state of the atmosphere but the state of the whole climatic system consisting of atmosphere, ocean and land surface
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