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http://hdl.handle.net/2122/1605
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.: | 5/40 (1997) | URI: | http://hdl.handle.net/2122/1605 | Keywords: | baroclinic intability orographic cyclogenesis laboratory modelling |
Subject Classification: | 01. Atmosphere::01.01. Atmosphere::01.01.99. General or miscellaneous | 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: | Annals of Geophysics |
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