| Titre | La sécheresse en Afrique de l'Ouest / The drought in West Africa | |
|---|---|---|
| Auteur | Robert Morel | |
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Revue |
Géocarrefour Titre à cette date : Revue de géographie de Lyon |
| Numéro | volume 70, no 3-4, 1995 Sahel, la grande secheresse | |
| Page | 215-222 | |
| Résumé anglais |
Analysis of the evolution of rainfall in west Africa is updated. This is based on the calculation of new mean rainfall figures for the period 1961- 90. The first stage consisted of analysing results from more than a thousand rain gauges to provide long time-series data to determine the year when trends changed. The justification for the choice of 1968 as the beginning of the drought is discussed. Comparison between the wet period, 1950-67, and the more recent period since 1968 is based on an analysis of medians which shows that probability of a change in rainfall is one year in two. Study of variations shows a dramatic reduction in rainfall on the Atlantic coast. This reduction can exceed an annual total of 400 mm. The monthly distribution of variations shows a contrast between the zone north of the 10th parallel and the maritime region of the Gulf of Guinea. Source : Éditeur (via Persée) |
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| Article en ligne | http://www.persee.fr/web/revues/home/prescript/article/geoca_0035-113x_1995_num_70_3_4215 |
