On the 2017 rainy season intensity and subsequent flood events over West Africa

Adegoke, Jimmy; Sylla, Mouhamadou Bamba; Taylor, Christopher ORCID:; Klein, Cornelia ORCID:; Bossa, Aymar; Ogunjobi, Kehinde; Adounkpe, Julien. 2019 On the 2017 rainy season intensity and subsequent flood events over West Africa. In: Adegoke, Jimmy; Sylla, Mouhamadou Bamba; Bossa, Aymar Yaovi; Ogunjobi, Kehinde; Adounkpe, Julien, (eds.) Regional climate change series: floods. Accra, Ghana, WASCAL Publishing, 10-14.

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We analyze here the intensity of the 2017 rainy season in West Africa with particular focus on the characteristics of the precipitation events as well as the propagating Mesoscale Convective Systems (MCSs). This is to provide a context for the multiple flood events that occurred in most West African capital cities during 2017. The analysis reveals that the whole of West Africa experienced above normal precipitation during June-September compared to the last 35 years as a consequence of increased overall intensity of the monsoon season. Specifically, the flood events recorded in Conakry (Republic of Guinea), Freetown (Sierra Leone), Kidal (Mali), Niamey (Niger), San Pedro (Cote d’Ivoire) and Port Harcourt (Nigeria) resulted from the occurrences of more frequent and more intense precipitation events than usual. In Lagos (southwestern Nigeria) and Accra (southern Ghana) however, the recent flooding seems to be linked to more extended length of consecutive wet days linked to more intense and larger Mesoscale Convective Systems (MCSs) propagating across the region. Since numerous climate projections over West Africa suggest the situation may be exacerbated in future climate, stronger disaster management, early warning systems and adequate flood-control infrastructures are needed to combat the consequences of these intense extreme precipitation events fuelled by the changing climate regime.

Item Type: Publication - Book Section
Digital Object Identifier (DOI):
UKCEH and CEH Sections/Science Areas: Hydro-climate Risks (Science Area 2017-)
ISBN: 9789988285364
Additional Information. Not used in RCUK Gateway to Research.: Freely available via Official URL link.
Additional Keywords: monsoon season, extreme precipitation, flood events, climate change, mesoscale convective systems
NORA Subject Terms: Hydrology
Date made live: 19 Jul 2019 13:06 +0 (UTC)

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