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| Titel |
Summertime winds and direct cyclonic circulation: observations from Lake Geneva |
| VerfasserIn |
U. Lemmin, N. D'Adamo |
| 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 ; 14, no. 11 ; Nr. 14, no. 11, S.1207-1220 |
| Datensatznummer |
250012473
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| Publikation (Nr.) |
 copernicus.org/angeo-14-1207-1996.pdf |
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| Zusammenfassung |
| Records of wind, air temperature and air
pressure from nine stations, situated along the shoreline of Lake Geneva,
Switzerland, were analyzed for the summer period May to September. At all
stations the consistent appearance of significant spectral peaks and changes in
wind direction at the diurnal frequency indicates the importance of lake-land
breezes. It is shown that the surrounding topography has a strong modifying
effect (temporal and spatial) on the lake-land breeze. Superimposed on this
cyclic wind pattern, short episodes of strong winds with long fetch over parts
of Lake Geneva are regularly observed. Both of these winds exert a spatially
variable wind stress over the lake surface on the same time scale. Typical
examples of the expected lake's response are presented, among them the
seasonally persistent gyre in the central part of the lake. Evidence is provided
that this dominant circulation is part of a direct cyclonic circulation,
generated by the curl of the diurnal wind field. It is concluded that the mean
circulation is caused by these winds and affected by the topography of the
surrounding land. |
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