Written Paper

Lithometeors and wind velocity in relation with desertification during the dry season from 1951 to 1994 in Niger  [1998]

Ozer, P. (Universita degli Studi di Genova (Italy). Dipt. di Scienze della Terra)

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The evolution of the lithometeor frequency and the wind velocity recorded during the dry season in eight meteorological stations of Niger is analysed from 1951 to 1994. The rise of airborne dust is constantly augmenting from the desert (Bilma) to the southern Sahelian stations (Niamey) where it has increased by a factor five. It has also been shown that the area of Bilma did not provide the Sahelian zone with airborne dust during the 80s as was suggested by several authors. All stations have recorded a general increase of wind velocity. In Niamey, the rise is of 70/ during the 44-year period passing from 4.3 m per sec to 7.1 m per sec. The increase of lithometeors frequency as well as the wind velocity during the drought period is not explained by the aridification. But their direct relation is significant in Bilma and Niamey.