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Autori: Mikuš, Petra; Telišman Prtenjak, Maja; Strelec Mahović, Nataša
Naslov: Analysis of the convective activity and its synoptic background over central Mediterranean (Croatia)
( Analysis of the convective activity and its synoptic background over central Mediterranean (Croatia) )
Izvornik: 5th HyMeX Workshop
Skup: 5th HyMeX Workshop
Mjesto i datum: Punta Prima, Menorca (Spain), 17-19.05.2011.
Ključne riječi: lightning; convection; weather types; upper-level flow regimes
( lightning; convection; weather types; upper-level flow regimes )
Deep convective activity, identified by lightning measurements and associated favorablesynoptic conditions are analyzed. The focus was on the warm part of the year (April to October) during the period 2006 - 2010, over six sub-regions in Croatia. A convectively active day is defined as a day with at least ten lightning strikes over the target sub-region. The obtained dataset is used to determine the climatology of the frequency and regional distribution of convective days and their inter-month variability. The analysis shows that 56% of all examined days, i.e. every second day during warm part of the year, is a day with convective activity. Convectively most active sub- region is North Adriatic, with 62, 4% of all days in the analyzed sample. The areas eastward of 16°E exhibit a peak in convective activity in June, contrary to more western sub-regions that show a maximum later in the summer, from July to August. The average temporal characteristics such as typical duration, onset and cessation of convection are estimated as well. In all sub- regions, the convective activity begins in the early afternoon and ends mostly in the evening. Nocturnal convection occurs more frequently along the Adriatic coast. In the second part, the dominant large-scale weather types and upper-level flow regimes, corresponding to the convectively active days, were determined using surface and upper-levels pressure fields. The lightning flashes are frequently detected in the non- gradient pressure field (23%), in the cyclone center (18%), in the leading (15%) and in the rear (12%) parts of the cyclone, as well as in the front part of a trough (11%). The southwesterly upper-level flow represents the most common flow regime (38%) in the days with convective activity. Slightly less, the northeasterly flow occurs with a frequency around 23% and the northwesterly flow in 18% of all selected days.
Vrsta sudjelovanja: Poster
Vrsta prezentacije u zborniku: Sažetak
Vrsta recenzije: Nema recenziju
Projekt / tema: 004-1193086- 564 3036, 119-1193086-1311
Izvorni jezik: eng
Kategorija: Znanstveni
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Upisao u CROSBI: (, 23. Svi. 2011. u 12:26 sati

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