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Large-scale overview of the summer monsoon over West Africa during the AMMA field experiment in 2006

Janicot, S. and Thorncroft, C.D. and Ali, A. and Asencio, N. and Berry, G. and Bock, O. and Bourles, B. and Caniaux, G. and Chauvin, F. and Deme, A. and Kergoat, L. and Lafore, J.-P. and Lavaysse, C. and Lebel, T. and Marticorena, B. and Mounier, F. and Nedelec, P. and Redelsperger, J.-L. and Ravegnani, F. and Reeves, C.E. and Roca, R. and Rosnay, P. de and Schlager, H. and Sultan, B. and Tomasini, M. and Ulanovsky, A. and ACMAD forecasters team, (2008) Large-scale overview of the summer monsoon over West Africa during the AMMA field experiment in 2006. Annales Geophysicae, 26, pp. 2569-2595.

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Official URL: http://www.ann-geophys.net/26/2569/2008/


The AMMA (African Monsoon Multidisciplinary Analysis) program is dedicated to providing a better understanding of the West African monsoon and its influence on the physical, chemical and biological environment regionally and globally, as well as relating variability of this monsoon system to issues of health, water resources, food security and demography for West African nations. Within this framework, an intensive field campaign took place during the summer of 2006 to better document specific processes and weather systems at various key stages of this monsoon season. This campaign was embedded within a longer observation period that documented the annual cycle of surface and atmospheric conditions between 2005 and 2007. The present paper provides a large and regional scale overview of the 2006 summer monsoon season, that includes consideration of of the convective activity, mean atmospheric circulation and synoptic/intraseasonal weather systems, oceanic and land surface conditions, continental hydrology, dust concentration and ozone distribution. The 2006 African summer monsoon was a near-normal rainy season except for a large-scale rainfall excess north of 15° N. This monsoon season was also characterized by a 10-day delayed onset compared to climatology, with convection becoming developed only after 10 July. This onset delay impacted the continental hydrology, soil moisture and vegetation dynamics as well as dust emission. More details of some less-well-known atmospheric features in the African monsoon at intraseasonal and synoptic scales are provided in order to promote future research in these areas.

Document Type:Article
Title:Large-scale overview of the summer monsoon over West Africa during the AMMA field experiment in 2006
AuthorsInstitution or Email of Authors
Janicot, S.Univ. de Paris, Paris, F
Thorncroft, C.D.Univ. of Albany, Albany, NY, USA
Ali, A.Lab. d'étude des Transferts en Hydrologie et Environment, Grenoble, F
Asencio, N.Meteo-France, Toulouse, F
Berry, G.Univ. of Albany, Albany, NY, USA
Bock, O.Univ. Pierre et Marie Curie, Paris, F
Bourles, B.Lab. d'Etudes en Géophysique et Océanographie Spatiale, Brest, F
Caniaux, G.Meteo-France, Toulouse, F
Chauvin, F.Meteo-France, Toulouse, F
Deme, A.CNRS, Toulouse, F
Kergoat, L.CNRS, Toulouse, F
Lafore, J.-P.Meteo-France, Toulouse, F
Lavaysse, C.Univ. Pierre et Marie Curie, Paris, F
Lebel, T.Lab. d'étude des Transferts en Hydrologie et Environment, Grenoble, F
Marticorena, B.CNRS, Toulouse, F
Mounier, F.Univ. de Paris, Paris, F
Nedelec, P.CNRS, Toulouse, F
Redelsperger, J.-L.Meteo-France, Toulouse, F
Ravegnani, F.CNR, Bologna, I
Reeves, C.E.Univ. of East Anglia, Norwich, UK
Roca, R.CNRS, Toulouse, F
Rosnay, P. deCNRS, Toulouse, F
Sultan, B.Lab. d'Océanographie et du Climat, Paris, F
Tomasini, M.Meteo-France, Toulouse, F
Ulanovsky, A.Central Aerological Observatory, Moscow, R
ACMAD forecasters team, ACMAD, Niamey, NIG
Date:5 September 2008
Journal or Publication Title:Annales Geophysicae
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 2569-2595
Keywords:mesocale convective system, West African monsoon, aircraft measurements
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Helga Jesse
Deposited On:18 Nov 2008
Last Modified:20 Oct 2014 14:32

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