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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:06 |
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Conference: Bucharest University Faculty of Physics 2018 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
The weather phenomena associated with the bent-back front of a Shapiro-Keyser extratropical cyclone
Authors:
Mihaela BRÂNCUŞ (1,2), Sabina ȘTEFAN (1)
*
Affiliation:
1) University of Bucharest, Faculty of Physics, P.O. BOX, MG-11, Magurele, Romania
2) Romanian National Meteorological Administration- RMC Oltenia, Craiova, 200581, Romania
E-mail
mihaela.brancus@yahoo.com
Keywords:
heavy precipitation, strong winds, Shapiro-Keyser cyclone, bent-back front
Abstract:
The aim of the present study is to stress the influence of the associated phenomena of a bent-back front on the weather in Romanian territory even for the cases when cyclones don’t have a rapid deepening. Such fronts begin to develop when an extratropical cyclone undergoes stage III of the Shapiro-Keyser conceptual model (1). In the poleward side of the bent-back fronts banded heavy precipitation (2) fall as a result of strong frontogenesis and instabilities. In the southwestern part of the low center strong winds form that can be associated with cold-conveyor belt. Cyclone cases of the last two cold seasons were analyzed and it was found that both heavy precipitation and strong winds can affect northern and southern parts of the country and not just the continental area. The new theory of cyclones evolution comes to complete the old Norwegian cyclone conceptual model who was the foundation of synoptic meteorology since the ’20. Also the Shapiro-Keyser model makes a step forward toward the conveyor belts and airstreams conceptual model.
References:
(1) Schultz D. M. and and G. Vaughan, 2011: Occluded fronts and the occlusion process: A fresh look at conventional wisdom. Bull. Amer. Meteor. Soc., 92, 443–466, ES19–ES20
(2) Shapiro, M. A., and D. Keyser, 1990: Fronts, jet streams and the tropopause. Extratropical Cyclones, The Erik Palmén Memorial Volume, C. W. Newton and E. O. Holopainen, Eds., Amer. Meteor. Soc., 167–191.
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