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| Titel |
Atmospheric processes triggering the central European floods in June 2013 |
| VerfasserIn |
C. M. Grams, H. Binder, S. Pfahl, N. Piaget, H. Wernli |
| 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 Sciences ; 14, no. 7 ; Nr. 14, no. 7 (2014-07-04), S.1691-1702 |
| Datensatznummer |
250118537
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| Publikation (Nr.) |
 copernicus.org/nhess-14-1691-2014.pdf |
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| Zusammenfassung |
| In June 2013, central Europe was hit by a century flood affecting the
Danube and Elbe catchments after a 4 day period of heavy
precipitation and causing severe human and economic loss. In this
study model analysis and observational data are investigated to
reveal the key atmospheric processes that caused the heavy
precipitation event. The period preceding the flood was
characterised by a weather regime associated with cool and unusual
wet conditions resulting from repeated Rossby wave breaking
(RWB). During the event a single RWB established a reversed
baroclinicity in the low to mid-troposphere in central Europe with
cool air trapped over the Alps and warmer air to the north. The
upper-level cut-off resulting from the RWB instigated three
consecutive cyclones in eastern Europe that unusually tracked
westward during the days of heavy precipitation. Continuous
large-scale slantwise ascent in so-called "equatorward ascending"
warm conveyor belts (WCBs) associated with these cyclones is found
as the key process that caused the 4 day heavy precipitation
period. Fed by moisture sources from continental evapotranspiration,
these WCBs unusually ascended equatorward along the southward
sloping moist isentropes. Although "equatorward ascending" WCBs
are climatologically rare events, they have great potential for
causing high impact weather. |
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