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| Titel |
Mesoscale convective systems in Spain: instability conditions and moisture sources involved |
| VerfasserIn |
S. Queralt, E. Hernández, D. Gallego, P. Lorente |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Observation, Prediction and Verification of Precipitation (EGU Session 2007) ; Nr. 16 (2008-04-09), S.81-88 |
| Datensatznummer |
250013074
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| Publikation (Nr.) |
 copernicus.org/adgeo-16-81-2008.pdf |
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| Zusammenfassung |
| Source-receptor water vapor content areas are analyzed for a particular case
of deep mesoscale convective system (MCS) developed over the Mediterranean
margin of Spain in October 1982. The aim of this work is to study
simultaneously the atmospheric instability conditions and water vapour
fluxes which finally resulted in very severe precipitation rates, reaching
up to 600 mm in a single day. Humidity amounts and transport are quantified
along the trajectories computed from a lagrangian particle simulation model
(FLEXPART6.2). To evaluate the precipitation probability, the water vapor
content and both thermodynamic and dynamic atmospheric instability
components were assessed. The October 1982 Iberian MCS occurred as a
consequence of a deep cutoff low detected between 500 and 200 hPa levels.
The dynamical instability was measured through potential vorticity anomalies
and Q vector divergence, which presented their maximum and minimum centers
respectively over south-eastern Iberia. Synoptic and dynamic instability
conditions were obtained from the ERA-40 reanalysis dataset. It is observed
that during this severe weather episode, the specific humidity increased
along the lowest and easternmost trajectories, which are mainly spread over
the Mediterranean Sea. |
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