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| Titel |
Bora-induced currents corresponding to different synoptic conditions above the Adriatic |
| VerfasserIn |
G. Beg Paklar, A. Bajić, V. Dadić, B. Grbec, M. Orlic |
| 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 ; 23, no. 4 ; Nr. 23, no. 4 (2005-06-03), S.1083-1091 |
| Datensatznummer |
250015204
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| Publikation (Nr.) |
 copernicus.org/angeo-23-1083-2005.pdf |
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| Zusammenfassung |
| The Bora wind field is characterised by strong vorticity and divergence. Several
numerical experiments, in which an oceanographic model was forced with
northeasterly winds having climatological alongshore variability, were
performed in order to study the influence of spatial variability in the bora
wind field on the surface currents in the northern Adriatic. Numerical model
results showed that during bora episodes with lower speeds and fast offshore
decay surface currents along transect Rovinj - Po River are predominantly in
the downwind direction. On the other hand, during bora episodes with strong
intensity and slow offshore decay, a cyclonic gyre due to the pronounced
bora alongshore variability is formed in the northernmost part of the
Adriatic Sea and the studied transect is influenced by the counter currents.
Moreover, bora having a high speed and a short offshore range produces the same
effect in the eastern part of the Rovinj - Po River transect as low-speed
bora characterised by slow offshore decay.
Eulerian current measurements performed in the northern Adriatic during bora
episodes characterised by different synoptic conditions supported the
numerical model findings. Surface currents during the bora episode of 8-11
February 1984 were directed downwind, whereas during the episode of 12-19
February 1984 they were directed upwind. The first episode was characterised
by a deep bora layer with cyclonic activity over the western Mediterranean and
Genoa Bay, whereas the second one was accompanied by temperature inversion
and a southwesterly tropospheric wind above a shallow bora layer. According to
the hydraulic theory developed by Smith (1985), an observed descent of isentropes
during the second bora episode led to the stronger acceleration in the bora
layer and its larger offshore extent. Different offshore bora decays during
studied events were confirmed by a comparison of the wind data originating
from the meteorological stations positioned on the opposite Adriatic coasts. |
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