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| Titel |
African and Atlantic short-term climatic variations described from Meteosat water vapor channel |
| VerfasserIn |
L. Picon, S. Fongang, G. Seze, M. Desbois |
| 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 ; 13, no. 7 ; Nr. 13, no. 7, S.768-781 |
| Datensatznummer |
250011920
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| Publikation (Nr.) |
 copernicus.org/angeo-13-768-1995.pdf |
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| Zusammenfassung |
| Pluriannual series of Meteosat-2 water vapor
(WV) images are used to build average maps of decadal and monthly brightness
temperatures in the 6.3 µm channel. This processing is applied to all the
3-hourly scenes, clear or cloudy, for July 1983 to July 1987. The ISCCP
cloudiness analyses confirm that the warmest spots in the monthly WV images
correspond to scenes either clear or covered with low clouds, whereas the
coldest areas correspond to scenes where cloud tops above 440 hPa frequently
occur. The WV statistics are then used to characterize seasonal and interannual
variations of both the ITCZ (InterTropical Convergence Zone) and the warm (dry)
areas, corresponding to subtropical subsidence. Thanks mainly to the seasonal
variations, relationships between the variations in the ITCZ and in dry
subtropical areas can be studied. It is shown that, for the Meteosat sector, a
wetter subtropical high troposphere is associated with an enhanced activity of
the ITCZ, and vice versa. For this area where the north-south assymetry is
large, the negative water vapor feedback previously proposed seems not to occur. |
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