Evolution récente des extrêmes pluviométriques au Niger (1950-2014)

Translated title of the contribution: Recent evolution of rainfall extremes in Niger (1950-2014)

Pierre Ozer, Ousmane Laminou Manzo, Adamou Didier Tidjani, Bakary Djaby, Florence De Longueville

Research output: Contribution to journalReview articlepeer-review

Abstract

West Africa is the region of the world with the highest recent rainfall deficit. Niger, one of the poorest countries in the world, is highly dependent on rainfall variations in the context of global warming, the consequences of which seem to be unfavorable in the coming decades. Based on the daily rainfall data of 37 Nigerien stations, this article analyzes the evolution of precipitation through eleven indices between 1950 and 2014. After a severe drought of three decades which is individualized from 1968 to 1997, it appears that if a return at subnormal annual average rainfall is observed since 1998, this is not the case for other vital indices for the rural world, depending on the good distribution of rainfall during the rainy season. Indeed, the consecutive dry days have increased and the consecutive wet days have been reduced. The same goes for rainy days. At the same time, the proportion of daily maximum precipitation in the total annual rainfall has increased over time and the proportion of intense rainfall in the annual rainfall totals has increased significantly in the last two decades.

Translated title of the contributionRecent evolution of rainfall extremes in Niger (1950-2014)
Original languageFrench
Pages (from-to)375-383
Number of pages9
JournalGeo-Eco-Trop
Volume41
Issue number3
Publication statusPublished - 1 Jan 2017

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