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Cloud-to-Ground lightning observations over the Western Antarctic region
Univ Kebangsaan Malaysia, Inst Climate Change, Space Sci Ctr ANGKASA, Bangi 43600, Selangor Darul, Malaysia;Univ Tekn Malaysia Melaka, Fak Kejuruteraan Elekt & Kejuruteraan Komputer, Atmospher & Lightning Res Lab, Ctr Telecommun Res & Innovat CeTRI, Durian Tunggal 76100, Melaka, Malaysia.
Univ Tekn Malaysia Melaka, Fak Kejuruteraan Elekt & Kejuruteraan Komputer, Atmospher & Lightning Res Lab, Ctr Telecommun Res & Innovat CeTRI, Durian Tunggal 76100, Melaka, Malaysia.
Univ Kebangsaan Malaysia, Inst Climate Change, Bangi 43600, Selangor Darul, Malaysia;Univ Kebangsaan, Fac Engn & Built Environm, Ctr Adv Elect & Commun Engn, Bangi, Malaysia.
Univ Kebangsaan Malaysia, Inst Climate Change, Space Sci Ctr ANGKASA, Bangi 43600, Selangor Darul, Malaysia.
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2019 (English)In: Polar Science, ISSN 1873-9652, E-ISSN 1876-4428, Vol. 20, p. 84-91Article in journal (Refereed) Published
Abstract [en]

This paper presents the observations and characterization of Cloud-to-Ground (CG) lightning activity in Western Antarctica in a region that covers the Amundsen/Bellingshausen Sea (ABS), the Antarctic Peninsula (AP) and the Weddell Sea (WS). Lightning data have been collected by a lightning detector (Boltek LD-350) and an atmospheric electric field mill (EFM-100) sensors deployed at the Carlini Base on the Antarctic Peninsula (CARL: 62.23 degrees S, 58.63 degrees W). The flash rate and flash multiplicity were analysed for three different seasons within a 1,000 km range, starting at the end of summer (February 2017) and ending in winter (July 2017). Three storm days for each month (within the 1,000 km radius from the LD sensor) with three composite active thunderstorms (labelled as Storm region A, B, and C) for each day have been selected from a collection of storm days between February and July 2017. A total of 355,899 flashes have been recorded with 156,190 Positive CG and 199,709 Negative CG flashes from these 54 thunderstorms. In total, Positive CG flash counts made up around 43.9% of the total detected CG flashes. Most of the Positive CG flashes (> 80%) had only 1 or 2 strokes with a maximum number of 5. For Negative CG flashes, the average multiplicity and the maximum multiple stroke were 1.2 and 16 respectively. Most CG flashes were detected during the summer and fall months. Positive CG flashes were prevalent in Western Antarctic storms even during the winter. The mean, median and range of the ratio of Positive CG to Negative CG flashes were 0.7, 0.718 and 0.217-1.279, respectively.

Place, publisher, year, edition, pages
ELSEVIER , 2019. Vol. 20, p. 84-91
Keywords [en]
Antarctic, Cloud-to-ground flash, Flash rate, Stroke multiplicity
National Category
Meteorology and Atmospheric Sciences
Identifiers
URN: urn:nbn:se:uu:diva-394174DOI: 10.1016/j.polar.2019.05.002ISI: 000483368600010OAI: oai:DiVA.org:uu-394174DiVA, id: diva2:1358662
Conference
7th Malaysian International Seminar on Antarctica (MISA) - Connectivity between Polar and Equatorial Climate and Biosphere - From the Poles to the Tropics, AUG 15-17, 2017, Kuala Terengganu, MALAYSIA
Available from: 2019-10-08 Created: 2019-10-08 Last updated: 2019-10-08Bibliographically approved

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