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| Titel |
Large-scale overview of the summer monsoon over West Africa during the AMMA field experiment in 2006 |
| VerfasserIn |
S. Janicot, C. D. Thorncroft, A. Ali, N. Asencio, G. Berry, O. Bock, B. Bourles, G. Caniaux, F. Chauvin, A. Deme, L. Kergoat, J.-P. Lafore, C. Lavaysse, T. Lebel, B. Marticorena, F. Mounier, P. Nédélec, J.-L. Redelsperger, F. Ravegnani, C. E. Reeves, R. Roca, P. Rosnay, H. Schlager, B. Sultan, M. Tomasini, A. Ulanovsky, ACMAD forecasters team |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 26, no. 9 ; Nr. 26, no. 9 (2008-09-05), S.2569-2595 |
| Datensatznummer |
250016211
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| Publikation (Nr.) |
 copernicus.org/angeo-26-2569-2008.pdf |
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| Zusammenfassung |
| 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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