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Back-tracking water vapour contributing to a precipitation event over Trentino: a case study

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The relation between individual precipitation patterns over an Alpine target area and the origin of the water vapour which contributes to them is investigated. Back-trajectories are calculated, starting from selected ending points over the target area, by means of the Lagrangian model FLEXTRA, on the basis of meteorological fields provided by ECMWF 4d-Var analysis data. Suitable clustering procedure is devised to identify representative flow patterns from calculated trajectories. The procedure is applied to a recent precipitation event (24–27 November 2002) adopted as a test case. The analysis allows to identify the contribution of various air streams to the precipitation, as well as the regions where most of the evaporation into the air streams occurred at various phases of the event.

Die Beziehungen zwischen Niederschlagsmustern in einer speziell betrachteten Region in den Alpen und dem Ursprung des zum Niederschlag beitragenden Wasserdampfs werden untersucht. Ausgehend von ECMWF Analysefeldern werden Rückwärtstrajektorien von ausgewählten Endpunkten über der betrachteten Region durch das Lagrange'sche Modell FLEXTRA berechnet. Eine geeignete Clustering-Methode wird vorgestellt, um in den berechneten R ückwärtstrajektorien Strömungsmuster identifizieren zu können. Die Methode wird an einer Niederschlagsepisode (24–27 November 2002) exemplarisch angewendet, und soll als Testfall dienen. Die Analyse gestattet, Beiträge zum Niederschlag zu identifizieren, die von verschiedenen Luftströmen herrühren. Außerdem liefert sie für die verschiedenen Phasen der Episode die Regionen, über denen die größte Verdunstung in die Luftströme hinein geschah.
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Document Type: Research Article

Publication date: 01 June 2004

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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