Initiation de la convection au–dessus des Vosges et de la Forêt Noire au cours de la campagne COPS : approche multi-instrumentale appliquée au 15 juillet 2007

Christophe Merlet 1
1 SPACE - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : Storms prediction is one of the major problems of weather forecasting, regarding both the anticipation of situations in which convective phenomena are observed and cases for which convection does not initiate. The COPS (Convective and orographically-induced Precipitation Study) campaign which took place during the summer of 2007 over the Vosges and the Black Forest was an opportunity to use a complete multi- instrumental dataset to study the mesoscale variability of water vapor in the lower troposphere, and its impact on the initiation and inhibition of convection. The present work is focused particularly on dry layers observed many times in preconvective conditions during the campaign. Based on the case study of 15 July 2007, the work details the processes that govern these dry layers and the role they play in the inhibition of convection. These processes involve regional advection of dry structures as well as more local processes related mainly to the impact of the topography on the impinging flow as well as diurnal orographic forcing. The analysis of the synoptic origin of dry air masses impacting the COPS region was also studied. Work around this case study also highlighted the worth of GPS tomography to study the spatial and temporal variability of water vapor at the regional scale. Similarly, the limited area model Meso-NH was used to assist in the interpretation process as well as to calculate air masses back-trajectories. A critical analysis of the representation of the dry layers in the model was also performed.
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Submitted on : Wednesday, March 18, 2015 - 3:56:47 PM
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  • HAL Id : tel-01133102, version 1

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Christophe Merlet. Initiation de la convection au–dessus des Vosges et de la Forêt Noire au cours de la campagne COPS : approche multi-instrumentale appliquée au 15 juillet 2007. Météorologie. Université Pierre et Marie Curie, 2013. Français. ⟨tel-01133102⟩

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