Journal of Earth Science & Climatic Change
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The variability of the West African monsoon had socio- economic and environmental impacts on populations. This variability
is closely linked to atmospheric circulation, which also plays a dominant role in the organization of the monsoon. These
experimental results provide information on the dynamics of winds through the features of the jets. Data are provided by VHF
wind profiler radar installed in Benin, precisely Nangatchori (9?6472N, 1?7411E) during the measurement campaign AMMA
program (2006-2007). This study shows the presence of the African Easterly Jet (AEJ) in the middle troposphere (2-4 km). It
shows also the presence of the Subtropical Jet West (STJ) and the Tropical Easterly Jet (TEJ) in the upper troposphere (10 km).
The patterns obtained let distinguish two great seasons characterizing the Hydro meteorological Observatory of Ou?m? Upper
Valley. The Hierarchical Agglomerative Clustering (HAC) applied to the wind mean velocity and frequency of direction at 10
km associated to the monthly rain confirms the two great season?s existence: one dry season (November to March) and wet
season (April to October). The wet season is characterized by three phases: the pre-wet phase (April, May and June), the heart
of the wet season (July, August, September) and the post-wet phase (October).
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