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| Titel |
Climatology of gravity wave activity during the West African Monsoon |
| VerfasserIn |
P. Kafando, F. Chane-Ming, M. Petitdidier |
| 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. 12 ; Nr. 26, no. 12 (2008-12-12), S.4081-4089 |
| Datensatznummer |
250016332
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| Publikation (Nr.) |
 copernicus.org/angeo-26-4081-2008.pdf |
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| Zusammenfassung |
| Gravity wave activity is analysed in the lower stratosphere using 6 year
radiosonde data (2001–2006) above two meteorological stations in the West
African tropical region such as Niamey (13.47° N; 2.16° E) and
Ouagadougou (12.35° N; 1.51° W). Monthly total energy density of
gravity waves is computed with temperature and horizontal wind perturbations
to highlight the West African Monsoon period from June to September.
Comparison with monthly total energy density calculated with temperature
only supports that observed small-scale temperature and wind perturbations
are mostly associated with gravity waves in the lower stratosphere
especially for large values during the wet season. Above the two sites,
monthly evolution of gravity wave total energy density reveals a maximum
intensity of gravity wave activity in July during the West African Monsoon
period. Indicators of convective activity such as mean Outgoing Longwave
Radiation (OLR) and Tropical Rainfall Measuring Mission (TRMM) rain rates
reveal to be adequate monsoon proxies to be compared to gravity wave energy
intensity during the West African Monsoon. |
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