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Open AccessArticle

Recent Trends in the Daily Rainfall Regime in Southern West Africa

1
Department of Physics, University of Cape Coast, Cape Coast, Ghana
2
Univ. Grenoble Alpes, IRD, CNRS, Grenoble INP, IGE, 38000 Grenoble, France
3
Department of Physics, University of Ghana, Legon, Accra, Ghana
*
Author to whom correspondence should be addressed.
Atmosphere 2019, 10(12), 741; https://doi.org/10.3390/atmos10120741
Received: 8 October 2019 / Revised: 12 November 2019 / Accepted: 19 November 2019 / Published: 26 November 2019
(This article belongs to the Special Issue Trends in Hydrological and Climate Extremes in Africa)
Extreme climate events, either being linked to dry spells or extreme precipitation, are of major concern in Africa, a region in which the economy and population are highly vulnerable to climate hazards. However, recent trends in climate events are not often documented in this poorly surveyed continent. This study makes use of a large set of daily rain gauge data covering Southern West Africa (extending from 10° W to 10° E and from 4° N to 12° N) from 1950 to 2014. The evolution of the number and the intensity of daily rainfall events, especially the most extremes, were analyzed at the annual and seasonal scales. During the first rainy season (April–July), mean annual rainfall is observed to have a minor trend due to less frequent but more intense rainfall mainly along the coast of Southern West Africa (SWA) over the last two decades. The north–south seasonal changes exhibit an increase in mean annual rainfall over the last decade during the second rainy season (September–November) linked by both an increase in the frequency of occurrence of rainy days as well as an increase in the mean intensity and extreme events over the last decade. The study also provides evidence of a disparity that exists between the west and east of SWA, with the east recording a stronger increase in the mean intensity of wet days and extreme rainfall during the second rainy season (September–November). View Full-Text
Keywords: trends; rainfall regime; extremes; rainfall intensification; Southern West Africa trends; rainfall regime; extremes; rainfall intensification; Southern West Africa
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Nkrumah, F.; Vischel, T.; Panthou, G.; Klutse, N.A.B.; Adukpo, D.C.; Diedhiou, A. Recent Trends in the Daily Rainfall Regime in Southern West Africa. Atmosphere 2019, 10, 741.

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