Naslov
Characteristics of lightning activity in deep convective cloud with the overshooting tops

Autori
Mikuš, Petra ; Strelec Mahović, Nataša

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings - 2012 EUMETSAT Meteorological Satellite Conference, Sopot, Poland, 03-07 September 2012 EUMETSAT, / - , 2012

Skup
2012 EUMETSAT Meteorological Satellite Conference

Mjesto i datum
Sopot, Poljska, 03.09.2012. - 07.09.2012

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
lightning; overshooting top; brightness temperature difference

Sažetak
In this study, characterictics of lightning activity, such as type, height and amplitude of lightning strokes, in the penetrating clouds, i.e. convective clouds with overshooting tops (OT) are analyzed. The focus was on the warm part of the year (May-September) during 2009 and 2010. The study area covers region from approximately 41°N 8°E to 49.5°N 24°E. Deep convective clouds with OTs were detected from the Meteosat 9 data, using a so called COMB method based on the infrared window (IRW, 10.8 μm) channel and the absorption channels of water vapor (WV, 6.2 μm) and ozone (O3, 9.7 μm) in form of brightness temperature differences (BTD). COMB method combines the criteria for the IRW brightness temperature and the criteria for two BTDs, WV-IRW and O3-IRW. All pixels with O3-IRW BTD larger than 13 K in the region where IRW brightness temperature is lower than 215 K and WV-IRW BTD larger than 4 K are characterized as OTs. Lightning data were provided by the Lightning Location System, which is part of the International Lightning Detection Network in Europe (LINET). The LINET system detects total lightning discharge, but it also separately detects cloud to ground (CG), or intra cloud and cloud to cloud strokes (IC). For each satellite pixel meeting the OT, occurrence of lightning discharge was searched 5 min before and after the time of the scan within the range of 0.05° from the pixel position. The results will present the characteristics of lightning in the vicinity of the OTs

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA