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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 17:53 |
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Conference: Bucharest University Faculty of Physics 2016 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
The influence of the conveyor belts in increasing the orographic convection
Authors:
Octavian Paul BUGEAC (1,3), 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,
3) Romanian Air Traffic Services Administration, 10 Ion Ionescu de la Brad Blvd, Bucharest, Romania
E-mail
paul.bugeac@gmail.com,polifroniemirela@yahoo.com
Keywords:
conveyor belt, norvegian cyclone, conceptual models
Abstract:
The paper is dedicated to the study of some unusual behavior of the weather systems associated to midlatitude synoptic disturbances. Conveyor belt conceptual models are some of the most useful methods of explaining weather [1]. When satellite imagery is used as major ingredient in nowcasting, a very careful interpretation in terms of synoptic and mesoscale phenomena and mechanisms is needed. In this respect, some interaction with topography has to be considered for a good explanation of convective developments in cases of forced ascent of stable air. In order to explain this unusual behavior was analyzed the impact of Romanian specific topography on the development of the weather systems described using Norwegian Cyclone model and Conveyor Belt conceptual models. A good example of forced ascent associated with a conveyor belt is the convective development over Carpathians on 14-th of April 2016. Multispectral satellite imagery, radar products, convective available potential energy, 850 hPa equivalent potential temperature, geopotential and mean sea level pressure fields were used to make sense of the cloud bands associated to frontal systems and conveyor belts in terms of the dynamical factors that are producing them. The component of motion within the warm conveyor belt being parallel to the cold front and mainly ageostrophic component perpendicular to the front can interact with topography in terms of forced ascent or dissipation of weather systems [1]. The results of this paper can be used in further developments of nowcasting techniques for areas in which topography is an issue for very short range forecasts.
References:
1. Keith A. Browning, 1986: "Conceptual Models of Precipitation Systems", Meteorological Office, Bracknell, Berkshire RG12 2SZ, United Kingdom, DOI: http://dx.doi.org/10.1175/1520-0434(1986)001<0023:CMOPS>2.0.CO;2
Acknowledgement:
We thank National Meteorological Administration for providing all the materials needed in this research.
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