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Authors: Longhetto, A.*
Briatore, L.*
Chabert d'Hieres, G.*
Didelle, H.*
Ferrero, E.*
Giraud, C.*
Title: Physical modelling of baroclinic development in the lee of the Alps
Issue Date: Oct-1997
Series/Report no.: 40/5
Keywords: baroclinic intability
orographic cyclogenesis
laboratory modelling
Abstract: When baroclinic development is triggered by an obstacle, like an extended mountain range, the so-called lee, or secondary cyclogenesis can develop. The presence of the obstacle exerts a blocking effect on the lower layers of the impinging airflow, forcing them to go round its borders and reach the lee region with a delay. Blocking and delay are both responsible for the initial pressure decrease downwind of the mountain and for the subsequent proper downstream baroclinic development. According to this rather simple scheme, a cyclogenesis episode in the lee of the Alps was simulated in a hydraulic turntable. The results of these experiments showed a good agreement, both from a qualitative and quantitative point of view, with the analysis of an episode of lee cyclogenesis coupled to a cold outbreak in the Mediterranean, which actually occured in Southern Europe downstream of the Alps.
Appears in Collections:01.01.99. General or miscellaneous
Annals of Geophysics

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