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Article Dans Une Revue Journal of Geophysical Research: Atmospheres Année : 2024

Impact of the Sea Surface Temperature in the North‐Eastern Tropical Atlantic on Precipitation Over Senegal

Résumé

The study of Sahel's rainfall variability is crucial due to its vulnerability to climate change. Accurate forecasts are vital for managing water resources, agriculture, and health (Grace & Davenport, 2021; Sultan et al., 2005). This semi-arid region, experiences most of its precipitation from July to September (July, August, and September (JAS)). During this period, a zonal rain belt spans from approximately 5°N to 15°N across West Africa, shifting southward the rest of the year (Parker & Diop-Kane, 2017). The summer rains are primarily attributed to mesoscale convective systems (MCSs), with up to 95% originating above the eastern highlands and crossing East to West Africa within one or 2 days (Nicholson, 2013). These systems form due to the African Easterly Jet (AEJ)'s presence in the mid-troposphere, particularly its southern half, with strong horizontal vorticity facilitating barotropic and baroclinic instabilities (Parker & Diop-Kane, 2017). This zonal band of precipitation experiences strong year-to-year and even decadal variations between 10°N and 15°N. For instance, an exceptionally severe drought occurred in the 1980s (Le Barbé & Lebel, 1997). Various
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Dates et versions

insu-04427979 , version 1 (31-01-2024)

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Mamadou Thiam, Ludivine Oruba, Gaëlle de Coëtlogon, Malick Wade, Bouya Diop, et al.. Impact of the Sea Surface Temperature in the North‐Eastern Tropical Atlantic on Precipitation Over Senegal. Journal of Geophysical Research: Atmospheres, 2024, 129 (3), pp.e2023JD040513. ⟨10.1029/2023jd040513⟩. ⟨insu-04427979⟩
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