Journal ArticleDOI
A statistical downscaling to identify the large-scale circulation patterns associated with heavy precipitation events over southern France
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In this paper, the potential for a detection algorithm to identify discriminating analysis-based statistical predictors of a few relevant parameters that can be used to capture heavy precipitation events (HPEs), or, at least, their associated large-scale circulation (LSC) patterns in a climate scenario is assessed.Abstract:
This study assesses the potential for a detection algorithm to identify discriminating analysis-based statistical predictors of a few relevant parameters that can be used to capture heavy precipitation events (HPEs), or, at least, their associated large-scale circulation (LSC) patterns in a climate scenario. HPEs are defined from a sample combining ‘large-scale’ fields from the ECMWF ERA-40 reanalysis with local observations from the Meteo-France rain-gauge network. In a first step, LSC patterns considered as significantly favouring HPE over southern France are identified and described with the greatest robustness possible. For that purpose, an objective automatic clustering of the unfiltered 500 hPa geopotential height field is performed. Four clusters are obtained. Among them, the most discriminating for heavy precipitation is characterised by a synoptic-scale deep upper-level low northwest of the area of interest, inducing a southerly flow over the western Mediterranean Sea and southern France. In a second step, other lower-scale parameters are used to refine the characteristics of the clusters. It has been found that the low-level moisture transport is a relevant low-level ingredient to regionally characterise heavy precipitation. Indeed, ‘Cevennes’ cases are related to more south to southeasterly flows over the Gulf of Lion, whereas ‘Languedoc-Roussillon’ events occurred preferentially within a more pronounced easterly wind component with two streams of low-level moisture transport. Moreover, in-depth examination of the low-level features reveals that HPEs tend to occur when the wind blows in a specific direction and for the greatest low-level moisture flux over the Gulf of Lion. Finally, the predictive skill of a detection tool for HPEs over southern France, with only synoptic-scale favourable parameters as predictors, is discussed. It is shown that this tool allows selection of HPE situations in more than 70% of cases. Copyright © 2011 Royal Meteorological Societyread more
Citations
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Journal ArticleDOI
HyMeX-SOP1: The Field Campaign Dedicated to Heavy Precipitation and Flash Flooding in the Northwestern Mediterranean
Véronique Ducrocq,Isabelle Braud,Silvio Davolio,Rossella Ferretti,Cyrille Flamant,Agustin Jansa,Norbert Kalthoff,Evelyne Richard,Isabelle Taupier-Letage,Pierre-Alain Ayral,Sophie Belamari,Alexis Berne,Marco Borga,Brice Boudevillain,Olivier Bock,Jean-Luc Boichard,Marie-Noëlle Bouin,Olivier Bousquet,Christophe Bouvier,Jacopo Chiggiato,Domenico Cimini,Ulrich Corsmeier,Laurent Coppola,Philippe Cocquerez,Eric Defer,Julien Delanoë,Paolo Di Girolamo,Alexis Doerenbecher,Philippe Drobinski,Y. Dufournet,Nadia Fourrié,Jonathan J. Gourley,Laurent Labatut,Dominique Lambert,Jérôme Le Coz,Frank S. Marzano,Gilles Molinié,Andrea Montani,Guillaume Nord,Mathieu Nuret,Karim Ramage,Bill Rison,Odile Roussot,Frédérique Saïd,Alfons Schwarzenboeck,Pierre Testor,Joël Van Baelen,Béatrice Vincendon,Montserrat Aran,Jorge Tamayo +49 more
TL;DR: The first field campaign was devoted to heavy precipitation and flash floods from 5 September to 6 November 2012 within the framework of the 10-year international HyMeX (Hydrological cycle in the Mediterranean Experiment) dedicated to the hydrological cycles and related high-impact events as mentioned in this paper.
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Stephane Hallegatte,Ankur Shah,Robert J. Lempert,Robert J. Lempert,Casey Brown,Stuart P. D. Gill +5 more
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A Climatology of the Mesoscale Environment Associated with Heavily Precipitating Events over a Northwestern Mediterranean Area
TL;DR: In this paper, a 3D-Var mesoscale analysis was performed for a 5-yr period, considering cases with daily precipitation of >150 mm occurring over southern France during autumn.
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Analysis of flash flood regimes in the North-Western and South-Eastern Mediterranean regions
TL;DR: In this article, the authors analyzed the prominent characteristics of flash flood regimes in two Mediterranean areas: the North-Western Mediterranean region, which includes Catalonia, France and Northern Italy, and the South-Eastern Mediterranean region including Israel.
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Large‐scale wind and precipitation extremes in the Mediterranean: a climatological analysis for 1979–2012
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References
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