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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:35 |
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Conference: Bucharest University Faculty of Physics 2009 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Retrograde Mediterranean Cyclone-A Study of Two Cases from North-Eastern Romania
Authors:
Claudia Magureanu,Irina Carolina Oprea
Affiliation:
ROMATSA, Romanian Aeronautic
E-mail
claudia.magureanu@gmail.com
Keywords:
cyclone, heavy precipitation, mass trajectories
Abstract:
Two heavy precipitation events that affected the north eastern part of Romania are here described in terms of meteorological analysis of retrograde cyclone effects. Romanian territory is affected by the presence of the Mediterranean Lows that transport moist and warm air from Mediterranean Sea basin. Inverted S-shape of the Carpathians produces important deviations of the general flow and air mass trajectories associated with the principal pressure centers that affect weather in Europe. Black Sea represents also a major geographic particularity of the Romanian orography.In certain meteorological conditions, Mediterranean cyclones that reach the Black Sea get a retrograde movement and in this way they contribute to the moisture increasing content of the forming convective systems. The retrograded Mediterranean Lows affect primary the eastern and north-eastern part of the Romania. Additionally, different mesoscale forcing mechanisms acts to continuously generate convective cells and focus the deep convection over the same region during several hours increasing in this way the flash flood potential. Heavy precipitation events selected for analyzes occurred, first of them, on 18-19 August 2005, and the second on the 23-26 July 2008.ECMWF model analysis was used to investigate dynamical forcing and ALADIN model analysis was performed to investigate the mechanism responsible for the convection development. Data from conventional weather station, radar and satellite imagery were used to assess the magnitude of the rain events and to investigate the role of the different mode of convective system organization to the flash floods generation.
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