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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:03 |
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Conference: Bucharest University Faculty of Physics 2016 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Frontal activity dynamics in severe weather events
Authors:
Elena Mirela POLIFRONIE (1,2) and Sabina STEFAN (1)
Affiliation:
(1) University of Bucharest, Faculty of Physics, P.O.BOX MG-11, Magurele, Bucharest, Romania,
(2) National Meteorological Administration, Sos. Bucuresti-Ploiesti nr.97, Sector 1, ZIP Code 013686, Bucharest, Romania
E-mail
polifroniemirela@yahoo.com
Keywords:
vorticity advection, frontal system
Abstract:
The frontal systems associated to Mediterranean cyclones are responsible for the occurrence of most episodes of severe weather (heavy rains, hail, wind gusts) in our country [1]. The purpose of this paper is to analyze whether and in what way atmospheric fronts associated with Mediterranean depressions, reactivated in the Black Sea were responsible for heavy rains over the period 24 to 27 May 2016 over eastern Romania. The materials used to study the dynamics of fronts activities were mainly products of wide global model European Centre for Medium-Range Weather Forecasts (ECMWF) and limited area model outputs ALARO and ALADIN, satellite imagies and radar data. Occluded front action of the cyclone reactivated above the Black Sea, reached the stage of maturity, affected mainly the region of Moldova, the proof being the precipitation in this region, which exceeded 50 mm in almost three hours. Analysis and correlation of all data have shown that the increased vorticity advection at the level of 300 hPa, assured development of cyclonic vortex over the entire column tropospheric and stratospheric intrusion dry air accentuated instability and amplified the upward movement of air.
References:
1. Popa F., Banciu D. and Dima V.,2005: "Studiu comparativ al contextului meteorologic în care s-au produs inundațiile din primăverile anilor 1970 și 2005", Sesiunea de Comunicări Științifice a ANM, CD-ROM Proceedings, ISBN:973-0-04131-8
Acknowledgement:
We thank National Meteorological Administration for providing all the materials needed in this research. Also we thank to European Centre for Medium-Range Weather Forecasts (ECMWF), ALARO and ALADIN models.
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