Vischel T., Panthou G., Peyrillé P., Roehrig R., Quantin Guillaume, Lebel Thierry, Wilcox Catherine, Beucher F., Budiarti M. (2019). Precipitation extremes in the West African Sahel : recent evolution and physical mechanisms. In :
Venugopal V. (ed.), Sukhatme J. (ed.), Murtugudde R. (ed.), Roca R. (ed.). Tropical extremes : natural variability and trends. Amsterdam : Elsevier, 95-138. ISBN 978-0-12-809248-4.
Titre du document
Precipitation extremes in the West African Sahel : recent evolution and physical mechanisms
Année de publication
2019
Type de document
Partie d'ouvrage
Auteurs
Vischel T., Panthou G., Peyrillé P., Roehrig R., Quantin Guillaume, Lebel Thierry, Wilcox Catherine, Beucher F., Budiarti M.
In
Venugopal V. (ed.), Sukhatme J. (ed.), Murtugudde R. (ed.), Roca R. (ed.), Tropical extremes : natural variability and trends
Source
Amsterdam : Elsevier, 2019,
95-138 ISBN 978-0-12-809248-4
The West African Monsoon (WAM) has undergone drastic changes in the recent past causing dramatic impacts on populations. After 30 years of devastating drought, the last two decades experienced a growing number of damaging floods concurrent with ongoing episodes of water shortages and famines. This raised the issue of a more extreme climate in the Sahel with more intense rainfall and dry spells. This chapter gives an overview of progress on documenting the rainfall extremes in the Sahel, a subject that has long been ignored in the literature. It focuses on statistical characteristics of extremes, on their trends in the context of WAM decadal variability and on the physical mechanisms involved in their occurrence. Based on recent literature and original analyses of daily rain gauge records in the central Sahel, a significant intensification of the Sahelian rainfall regime is confirmed over the last 15 years: more extreme events, larger size storms, accompanied by a deficit in the occurrence of less intense events. From a composite of 20 extreme storms in Ouagadougou, some key atmospheric conditions are shown to drive extreme precipitation, including an intense southerly monsoon flux coincident with strong African easterly waves and a large-scale moist anomaly at the regional scale.
Plan de classement
Répartition spatio-temporelle des précipitations [062MECEAU01]
Descripteurs
PRECIPITATION ; EVOLUTION ; REGIME HYDROLOGIQUE ; VARIATION ANNUELLE ; PLUVIOMETRIE ; METHODOLOGIE ; MOUSSON ; CYCLE SAISONNIER ; EVENEMENT EXTREME
Description Géographique
ZONE SAHELIENNE ; AFRIQUE DE L'OUEST ; BURKINA FASO
Localisation
Fonds IRD [F A010075882]
Identifiant IRD
fdi:010075882
