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A new index, namely the African Southwesterly Index (ASWI), based on the persistence of the low‐level southwesterly winds in the region (29°–17°W; 7–13°N) is developed to characterise the strength of the West African Monsoon. The ASWI is significantly correlated with the monsoonal precipitation in the Sahel in the 1900–2013 period (r = + 0.57, r = + 0.66 and r = + 0.53 for July, August and September...
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