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| Titel |
Cyclogenesis in the Mediterranean basin: a diagnosis using synoptic-dynamic anomalies |
| VerfasserIn |
M. Kaspar, M. Müller |
| 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. 3 ; Nr. 9, no. 3 (2009-06-25), S.957-965 |
| Datensatznummer |
250006802
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| Publikation (Nr.) |
 copernicus.org/nhess-9-957-2009.pdf |
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| Zusammenfassung |
This work deals with the hypothesis that synoptically-driven heavy rains in
the Mediterranean region are connected with the occurrence of
synoptic-dynamic anomalies. We investigate this hypothesis by conducting a
diagnostic study of a cyclogenesis event from 18–21 July 2001. Cyclogenesis
started over the western Mediterranean Sea and was triggered by the approach
of a pre-existing upper trough over a lower frontal zone. The event was
first accompanied by heavy convective rains in northern Italy and later by
heavy, widespread and steady rains of non-convective character in Central
Europe.
Using re-analyses from the database ERA-40, we evaluate the synoptic-dynamic
anomalies by the cumulative distribution function relatively to July–August
area-related climatology over the reference period from 1958 to 2002. For
the duration of cyclogenesis, we detect significant anomalies associated
with the processes that support the completion of vertical coupling between
the lower frontal zone and the upper vorticity maximum. The periods of heavy
rains in both the Mediterranean region and Central Europe were characterised
by the occurrence of anomalies that created synoptic-scale conditions
favourable for triggering and sustaining heavy rains. Although these
anomalies were somewhat weaker in the period of heavy rains in Central
Europe than in the Mediterranean region, the analysis of their
spatio-temporal correspondence over the reference rainfall events in the
Czech Republic shows that they are typical of heavy rains there. Due to the
relatively high variability of the causal synoptic-scale conditions, this
study would benefit post-processing procedures aimed at improving warning
about this hazardous weather phenomenon to further investigate which
anomalies generally occur during synoptically-driven heavy rains in the
Mediterranean region and the strengths of these anomalies. |
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