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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:24 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Fog study using laser remote sensing and air circulation over Magurele
Authors:
Florica TOANCA (1,2), Sabina STEFAN (1), Simona ANDREI (2), Doina NICOLAE (2), Nicu BARBU (1,3)
Affiliation:
(1)University of Bucharest, Faculty of Physics, Atomistilor 405, P.O.BOX MG-11, Magurele, Bucharest, Romania.
(2)National Institute Institute of Research and Development for Optoelectronics INOE 2000, Magurele-Bucharest, Romania
(3)National Meteorological Administration, 97 Bucureşti-Ploieşti Str., Bucharest, Romania
E-mail
flori@inoe.ro
Keywords:
fog, Microwave Radiometer,Vaisala Ceilometer ,meteorological conditions
Abstract:
Fog is a phenomenon that reduce horizontal visibility to less than 1000 m due to the suspended water droplets. Considering this, low visibility meteorological conditions produced by fog have important negative effects on society. For example, total economic loss related to fog is comparable with that for tornadoes, even comparable to that for hurricanes or winter storms in some situations (Gultepe at al., 2007). This study is focusing on the analysis regarding fog events that occur over Magurele (26.029E, 44.348N, 93m ASL), a sub-urban area located south-western of Bucharest. Fog episodes occur in this region usually during autumn winter season (Toanca F. et al, 2015). One of the equipments used for this study is the RPG HATPRO Microwave Radiometer, a suitable tool for achieving meteorological situation (Labzovskii L. et al, 2014). Concerning this study, using the microwave radiometer we obtained the vertical profiles of temperature and relative humidity and also the diurnal variation of these meteorological parameters. Images of fog temporal evolution were achieved from the Vaisala Ceilometer CL 31 backscatter's coefficient. Local meteorological conditions for the analyzed period were integrated into a large-scale air circulation, using synoptic circulation patterns (Gross Wetter-Type GWT) developed within COST733 Action. This study emphasized that large-scale circulation changes are also related with pre/post frontal fog events. Also, our conclusion was that large-scale air circulation affects the generation and dissipation of fog by modification of the local meteorological conditions due to advection of air mass with different characteristics.
References:
I. Gultepe, Tardif R., Michaelides S.C., Cermak J., Bott A., Bendix J., Muller M.D., Pagowski M., Hansen B., Ellrod G., Jacobs W., Toth G., Cober S.G. (2007) Fog Reserach: A review of past achievements and future perspectives, Pure Appl. Geophys., 164 (6-7): 1121-1159
L. Labzovskii, Toanca F., Stefan S. (2014) Determination of Saharan dust properties over Bucharest, Romania. Part 1: procedures and algorithms", Romanian Journal in Physics, Rom. J. Phys. 59, 1084
Toanca F., Stefan S., Labzovskii L., Belegante L., Andrei S., Nicolae D. (2015) Study of fog events using remote sensing data, accepted for publication - Romanian Reports in Physics
Acknowledgement:
The work of the author F. Toancă was supported by the strategic grant POSDRU/159/1.5/S/137750, “Project Doctoral and Postdoctoral programs support for increased competitiveness in Exact Sciences research” co-financed by the European Social Found within the Sectorial Operational Program Human Resources Development 2007-2013.
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