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标题：The synoptic-scale atmospheric waves in West and Central African monsoons: Easterly waves and Kelvin wave
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作者：Serge Janicot ; Flore Mounier ; Arona Diedhiou 等
期刊名称：Science et changements planétaires / Sécheresse
印刷版ISSN：1147-7806
电子版ISSN：1777-5922
出版年度：2008
卷号：19
期号：1
页码：13-22
DOI：10.1684/sec.2008.0115
出版社：John Libbey Eurotext
摘要：Figures See all figures Authors Serge Janicot , Flore Mounier , Arona Diedhiou Institut de recherche pour le développement (IRD), Laboratoire d’océanographie et du climat : expérimentation et approches numériques (Locean), Boîte 100, 4, place Jussieu, 75252 Paris cedex 05, Institut de recherche pour le développement (IRD), Laboratoire d’étude des transferts en hydrologie et environnement (LTHE), BP 53, 38041 Grenoble cedex 09 Key words: African wave, Central Africa, climatology, meteorology, monsoon, monsoon flux, rainfall, West Africa DOI : 10.1684/sec.2008.0115 Page(s) : 13-22 Published in: 2008 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.
关键词：African wave; Central Africa; climatology; meteorology; monsoon; monsoon flux; rainfall; West Africa