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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:22 |
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Conference: Bucharest University Faculty of Physics 2013 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Analysis of spatial and temporal variations of cloud-to-ground lightning in Romania
Authors:
Daniel Carbunaru, Sorin Burcea, Bogdan Antonescu
Affiliation:
National Meteorological Administration, Bucharest, Romania
E-mail
danaiel.carbunaru@meteoromania.ro
Keywords:
cloud-to-ground lightning, convective storms
Abstract:
Severe weather events generating a significantly large number of cloud-to-ground lightning (CG) flashes have been analyzed. The CG flashes were recorded by the SAFIR type Romanian Lightning Detection Network, during 2003–2008. The research was focused on the overall dynamics of the CG associated with different severe convective storms which have developed in the same time, rather than focusing on the individual study of CG flashes associated with a given convective cell. For each severe event, the total number of CG flashes was grouped into a primary series which, afterwards, was used to analyze the spatial and temporal evolutions of CG flashes by building subsequent spatial (the distance between two consecutive CG flashes from primary series) and temporal (time interval between two consecutive CG flashes from primary series) series. Analysis revealed two classes of CG flashes: the ones that occurred in the same time and the ones occurring at different time moments. Time intervals between two CG flashes occurring at two time points are grouped around an average value. For each of the two classes, spatial intervals have been analyzed, the main resulted feature being that the majority of CG flashes occurring at the same moment in time are located at less than 10 km one from another. Frequency of detection associated to spatial intervals with various lengths, for every 1000 CG flashes from the primary series, have been analyzed. Results have shown that the majority of CG activity at a given time is grouped around a convective system, after which it is “transferred” to another convective system. For each severe event, distributions of the maximum currents at each 1000 CG flashes from the primary series were also obtained. The resulted distribution is invariant.
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