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Laboratoire d'aérologie |  |
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Laboratoire d'aérologie | |
| HAL: insu-00388742, version 1 |
| IRD Horizon id: fdi:010046577 |
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| Annales Geophysicae 26 (2008) 2569 à 2595 |
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| Large-scale overview of the summer monsoon over West Africa during the AMMA field experiment in 2006 |
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| Serge Janicot 1Chris D. Thorncroft 2 |
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| (2008) |
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| 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. |
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| 1: | Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) |
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Institut de recherche pour le développement [IRD] – INSU – CNRS : UMR7159 – Université Pierre et Marie Curie [UPMC] - Paris VI – Muséum National d'Histoire Naturelle (MNHN) |
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| 2: | Department of Earth and Atmospheric Sciences |
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University at Albany |
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| 3: | Laboratoire d'étude des transferts en hydrologie et environnement (LTHE) |
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CNRS : UMR5564 – OSUG – INSU – Université Joseph Fourier - Grenoble I – Institut National Polytechnique de Grenoble (INPG) – Institut de recherche pour le développement [IRD] : UR012 |
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| 4: | Groupe d'étude de l'atmosphère météorologique (CNRM-GAME) |
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CNRS : URA1357 – INSU – Météo France |
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| 5: | Service d'aéronomie (SA) |
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CNRS : UMR7620 – INSU – Université Pierre et Marie Curie [UPMC] - Paris VI – Université de Versailles Saint-Quentin-en-Yvelines |
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| 6: | Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) |
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CNRS : UMR5566 – Institut de recherche pour le développement [IRD] – CNES – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III |
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| 7: | Laboratoire de Météorologie Dynamique (LMD) |
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CNRS : UMR8539 – INSU – Université Pierre et Marie Curie [UPMC] - Paris VI – Polytechnique - X – Ecole normale supérieure de Paris - ENS Paris |
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| 8: | Centre d'études spatiales de la biosphère (CESBIO) |
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CNRS : UMR5126 – Institut de recherche pour le développement [IRD] – CNES – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III |
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| 9: | Laboratoire inter-universitaire des systèmes atmosphèriques (LISA) |
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CNRS : UMR7583 – INSU – Université Paris VII - Paris Diderot – Université Paris-Est Créteil Val-de-Marne (UPEC) |
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| 10: | Laboratoire d'aérologie (LA) |
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CNRS : UMR5560 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III |
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| 11: | Istituto di Scienze dell'Atmosfera e del Clima (ISAC-CNR) |
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Consiglio Nazionale delle Ricerche |
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| 12: | School of Environmental Sciences (UEA) |
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University of East Anglia |
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| 13: | Deutsches Zentrum fuer Luftund Raumfahrt |
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Institut fuer Physik der Atmosphaere |
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| 14: | Central Aerological Observatory |
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Central Aerological Observatory |
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| subject | : | Sciences of the Universe/Earth Sciences/Hydrology Environmental Sciences/Global Changes Sciences of the Universe/Ocean, Atmosphere |
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| Attached file list to this document: | |||||
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| insu-00388742, version 1 | |
| http://hal-insu.archives-ouvertes.fr/insu-00388742 | |
| oai:hal-insu.archives-ouvertes.fr:insu-00388742 | |
| From: Thierry Pellarin | |
| Submitted on: Friday, 28 August 2009 11:08:35 | |
| Updated on: Friday, 28 August 2009 11:32:33 | |
