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| Titel |
Characteristics of shallow thermally driven flow in the complex topography of the south-eastern Adriatic |
| VerfasserIn |
M. T. Prtenjak, I. Tomažić, I. Kavčič, S. Đivanović |
| 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 ; 28, no. 10 ; Nr. 28, no. 10 (2010-10-20), S.1905-1922 |
| Datensatznummer |
250016899
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| Publikation (Nr.) |
 copernicus.org/angeo-28-1905-2010.pdf |
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| Zusammenfassung |
Characteristics of thermally induced flow, namely the sea breeze, are
investigated along the south-eastern Adriatic. The chosen period 24–25 April
2006 favoured sea breeze development and simultaneously allowed a comparison
of the large-scale wind influence (north-westerly wind versus south-easterly
wind) and the complex terrain on the local circulations. Particular
attention is paid to the small-scale formation of the wind field,
convergence zones (CZs), channelling flows and small scale eddies,
especially in the vicinity of two airports in the central part of
south-eastern Adriatic. The results are based on wind measurements (from
meteorological surface stations, radiosoundings, satellite data and sodar
data) and further supplemented by model data at fine grid spacing.
This study shows the formation of numerous irregular daytime and nighttime
CZs, which occurred along the coastline in the lee of mountains and over the
larger, elongated islands. The results show that the above mentioned
airports are surrounded by daytime CZ formations within the lowermost 1000 m
and associated updrafts of 1 m s−1, especially if CZs are maintained by
the north-westerly large-scale winds. Whereas the daytime CZ was generated
due to merged sea breezes, the weaker and shallower nighttime CZs were
formed by wind convergence of the seaward breezes, and significantly
modified by the large-scale flow of the topography (e.g., accelerated flow
in the sea channels and substantial swirled flows around the islands).
The passes between the coastal mountain peaks changed the inflow
penetration, provoking the increase in wind speed of the channelled flow.
The strongest sea breeze channelling was observed above the valley of the
Neretva River, where the onshore flow reached 40 km inland with a strength
of 8 m s−1, and the highly asymmetric offshore part was confined within
the sea channel. |
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