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| Titel |
Mediterranean hurricanes: large-scale environment and convective and precipitating areas from satellite microwave observations |
| VerfasserIn |
C. Claud, B. Alhammoud, B. M. Funatsu, J.-P. Chaboureau |
| 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 ; 10, no. 10 ; Nr. 10, no. 10 (2010-10-29), S.2199-2213 |
| Datensatznummer |
250008453
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| Publikation (Nr.) |
 copernicus.org/nhess-10-2199-2010.pdf |
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| Zusammenfassung |
Subsynoptic scale vortices that have been likened to tropical cyclones or
polar lows (medicanes) are occasionally observed over the Mediterranean Sea.
Generated over the sea, they are usually associated with strong winds and
heavy precipitation and thus can be highly destructive in islands and costal
areas. Only an accurate forecasting of such systems could mitigate these
effects. However, at the moment, the predictability of these systems remains
limited.
Due to the scarcity of conventional observations, use is made of NOAA/MetOp
satellite observations, for which advantage can be taken of the time coverage
differences between the platforms that carry it, to give a very complete
temporal description of the disturbances. A combination of AMSU-B (Advanced
Microwave Sounding Unit-B)/MHS (Microwave Humidity Sounder) observations
permit to investigate precipitation associated with these systems while
coincident AMSU-A (Advanced Microwave Sounding Unit-A) observations give
insights into the larger synoptic-scale environment in which they occur.
Three different cases (in terms of intensity, location, trajectory, duration,
and periods of the year – May, September and December, respectively) were
investigated. Throughout these time periods, AMSU-A observations show that
the persisting deep outflow of cold air over the sea together with an
upper-level trough upstream constituted a favourable environment for the
development of medicanes. AMSU-B/MHS based diagnostics show that convection
and precipitation areas are large in the early stage of the low, but
significantly reduced afterwards. Convection is maximum just after the
upper-level trough, located upstream of cold mid-tropospheric air, reached
its maximum intensity and acquired a cyclonic orientation. |
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