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| Titel |
The main characteristics of atmospheric circulation associated with fog in Greece |
| VerfasserIn |
E. E. Houssos, C. J. Lolis, A. Bartzokas |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 9, no. 6 ; Nr. 9, no. 6 (2009-11-12), S.1857-1869 |
| Datensatznummer |
250007055
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| Publikation (Nr.) |
 copernicus.org/nhess-9-1857-2009.pdf |
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| Zusammenfassung |
| The characteristics of the atmospheric circulation over Europe and the
Mediterranean associated with the formation and the dissipation of fog in
Greece are examined. The data used consists of: i) 3-hourly meteorological
observations recorded at 16 meteorological stations in Greece and ii) daily
(00:00 UTC) 2.5×2.5 grid point values of mean sea-level pressure, 500 hPa
geopotential height, 850 hPa and 500 hPa air temperatures and 1000–500 hPa
thickness over Europe for the period 1957–2002. 1055 fog events are
extracted from the 3-hourly meteorological observations. A specific
methodology scheme including S-mode Factor Analysis and k-means Cluster
Analysis is applied to the grid point data sets for the first day of a fog
event (D day), the day prior to D day (D-1 day) and the day that follows the
last day of a fog event (END day) and the 1055 evolutions of the atmospheric
circulation associated with fog events in Greece are classified into 10
clusters. The mean patterns of MSL Pressure, 850 hPa and 500 hPa air
temperatures, 1000–500 hPa thickness and 500 hPa geopotential height show
that in most of the clusters, the presence of anticyclonic conditions over
the Balkans, a warm front passage, or a weak, humid southerly flow induced
by the presence of a shallow depression over the western Mediterranean favor
fog formation in Greece, while the dissipation of fog occurs when drier air
masses are transferred over the Balkans. The main differences among the 10
clusters refer to the exact position, the intensity and the specific
evolution of the surface and the upper air systems, the season of their
predominance and the area of the Greek territory that mainly refer to. |
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