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 Printable version |
The synoptic-scale atmospheric waves in West and Central African monsoons: Easterly waves and Kelvin wave |
Science et changements planétaires / Sécheresse. Volume 19, Number 1, 13-22, janvier-février-mars 2008, Article scientifique
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 Résumé
Article gratuit
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Author(s) : Serge Janicot, Flore Mounier, Arona Diedhiou |
Summary : This document is an updated synthesis of the three main atmospheric wave systems at the synoptic scale (spatial scale between 1000 and 10000 kilometers, time scale between 2 and 10 days) which have a significant impact on precipitation and convection during the West and Central Africa summer monsoons. Beside the very well known Easterly waves of 3-5 day periodicity, two other wave systems exist: Easterly waves of 6-9 day periodicity and equatorial Kelvin waves of about 6 day periodicity. These two wave systems are less frequent during the summer than the 3-5 day Easterly waves, but when they are present, they modulate convection and rainfall in West and Central Africa at a level equivalent to that of the 3-5 day Easterly waves. |
Keywords : African wave, Central Africa, climatology, meteorology, monsoon, monsoon flux, rainfall, West Africa |
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