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

Serge Janicot; Chris D. Thorncroft; Abdou Ali; Nicole Asencio; Gareth J. Berry; Olivier Bock; Bernard Bourlès; Guy Caniaux; Fabrice Chauvin; Abdoulaye Deme; Laurent Kergoat; Jean-Philippe Lafore; Christophe Lavaysse; Thierry Lebel; Béatrice Marticoréna; Flore Mounier; Philippe Nédélec; Jean-Luc Redelsperger; Fabrizio Ravegnani; C. E. Reeves; Rémy Roca; Patricia De Rosnay; Hans Schlager; Benjamin Sultan; Mireille Tomasini; Alexey Ulanovsky

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Large-scale overview of the summer monsoon over West Africa during the AMMA field experiment in 2006
Janicot S., Thorncroft C. D., Ali A., Asencio N., Berry G. J., Bock O., Bourlès B., Caniaux G., Chauvin F., Deme A. et al
Annales Geophysicae 26 (2008) 2569 à 2595 - http://hal-insu.archives-ouvertes.fr/insu-00388742

publication format:

Article in peer-reviewed journal

subject:

Sciences of the Universe/Earth Sciences/Hydrology

Environmental Sciences/Global Changes

Sciences of the Universe/Ocean, Atmosphere

title:

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

author(s):

Serge Janicot ¹, Chris D. Thorncroft ², Abdou Ali ³, Nicole Asencio ⁴, Gareth J. Berry ², Olivier Bock ⁵, Bernard Bourlès ⁶, Guy Caniaux (

) ⁴, Fabrice Chauvin ⁴, Abdoulaye Deme ⁷, Laurent Kergoat ⁸, Jean-Philippe Lafore ⁴, Christophe Lavaysse (

) ⁵, Thierry Lebel ³, Béatrice Marticoréna ⁹, Flore Mounier ¹, Philippe Nédélec ¹⁰, Jean-Luc Redelsperger ⁴, Fabrizio Ravegnani ¹¹, C. E. Reeves ¹², Rémy Roca (

) ⁷, Patricia De Rosnay ⁸, Hans Schlager ¹³, Benjamin Sultan (

) ¹, Mireille Tomasini ⁴, Alexey Ulanovsky ¹⁴

laboratory:

1:	Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN)

	Institut de recherche pour le développement [IRD] – INSU – CNRS : UMR7159 – Université Pierre et Marie Curie [UPMC] - Paris VI – Muséum National d'Histoire Naturelle (MNHN)

	case 100 4 place jussieu 75252 PARIS CEDEX 05

	France

2:	Department of Earth and Atmospheric Sciences

	University at Albany

	State University of New York, Albany, New York

	United States

3:	Laboratoire d'étude des transferts en hydrologie et environnement (LTHE)

	http://www.lthe.hmg.inpg.fr

	CNRS : UMR5564 – OSUG – INSU – Université Joseph Fourier - Grenoble I – Institut National Polytechnique de Grenoble (INPG) – Institut de recherche pour le développement [IRD] : UR012

	ENSHMG - Domaine Universitaire 1023-1025 Rue de la piscine - BP 53 38041 GRENOBLE CEDEX 9

	France

4:	Groupe d'étude de l'atmosphère météorologique (CNRM-GAME)

	http://www.cnrm.meteo.fr

	CNRS : URA1357 – INSU – Météo France

	METEO FRANCE CNRM 42 Av Gaspard Coriolis 31057 TOULOUSE CEDEX 1

	France

5:	Service d'aéronomie (SA)

	http://www.aero.jussieu.fr/

	CNRS : UMR7620 – INSU – Université Pierre et Marie Curie [UPMC] - Paris VI – Université de Versailles Saint-Quentin-en-Yvelines

	France

6:	Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS)

	http://www.legos.obs-mip.fr/

	CNRS : UMR5566 – Institut de recherche pour le développement [IRD] – CNES – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III

	14 avenue Edouard Belin 31400 Toulouse

	France

7:	Laboratoire de Météorologie Dynamique (LMD)

	http://www.lmd.jussieu.fr/

	CNRS : UMR8539 – INSU – Université Pierre et Marie Curie [UPMC] - Paris VI – Polytechnique - X – Ecole normale supérieure de Paris - ENS Paris

	LMD ENS 24 Rue Lhomond 75231 Paris Cedex 05

	France

8:	Centre d'études spatiales de la biosphère (CESBIO)

	http://www.cesbio.ups-tlse.fr

	CNRS : UMR5126 – Institut de recherche pour le développement [IRD] – CNES – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III

	bpi 2801 18 Av Edouard Belin 31401 TOULOUSE CEDEX 4

	France

9:	Laboratoire inter-universitaire des systèmes atmosphèriques (LISA)

	http://www.lisa.univ-paris12.fr/

	CNRS : UMR7583 – INSU – Université Paris VII - Paris Diderot – Université Paris-Est Créteil Val-de-Marne (UPEC)

	61 Av du général de Gaulle 94010 CRETEIL CEDEX

	France

10:	Laboratoire d'aérologie (LA)

	http://www.aero.obs-mip.fr/

	CNRS : UMR5560 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III

	14 avenue Edouard Belin 31400 Toulouse

	France

11:	Istituto di Scienze dell'Atmosfera e del Clima (ISAC-CNR)

	Consiglio Nazionale delle Ricerche

	Bologna, Italy

	Italy

12:	School of Environmental Sciences (UEA)

	http://www.uea.ac.uk/env

	University of East Anglia

	School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK

	United Kingdom

13:	Deutsches Zentrum fuer Luftund Raumfahrt

	Institut fuer Physik der Atmosphaere

	Oberpfaffenhofen-Wessling, Germany

	Germany

14:	Central Aerological Observatory

	Central Aerological Observatory

	Moscow, Russia

	Russian Federation

abstract:

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.

fulltext language:

English

journal:

Annales Geophysicae (Ann. Geophys.)
Publisher	European Geosciences Union (EGU)
ISSN	0992-7689 (eISSN : 1432-0576)

Audience:

international

publication date:

2008

volume:

page, identifiant, ...:

2569 à 2595

Attached file list to this document:

PDF

angeo-26-2569-2008.pdf

(6.8 MB)


insu-00388742, version 1
http://hal-insu.archives-ouvertes.fr/insu-00388742
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From: Thierry Pellarin <>
Submitted on: Friday, 28 August 2009 11:08:35
Updated on: Friday, 28 August 2009 11:32:33