Polarimetric radar characteristics of lightning initiation and propagating channels

Figueiras i Ventura, Jordi (MeteoSwiss, Locarno, Switzerland) ; Pineda, Nicolau (Meteorological Service of Catalonia, Barcelona, Spain, ; Universitat Politècnica de Catalunya UPC, Terrassa, Spain) ; Besic, Nikola (MeteoSwiss, Locarno, Switzerland) ; Grazioli, Jacopo (MeteoSwiss, Locarno, Switzerland) ; Hering, Alessandro (MeteoSwiss, Locarno, Switzerland) ; van der Velde, Oscar A. (Universitat Politècnica de Catalunya UPC, Terrassa, Spain) ; Romero, David (Universitat Politècnica de Catalunya UPC, Terrassa, Spain) ; Sunjerga, Antonio (EPFL, Lausanne, Switzerland) ; Mostajabi, Amirhossein (EPFL, Lausanne, Switzerland) ; Azadifar, Mohammad (School of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland) ; Rubinstein, Marcos (School of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland) ; Montanyà, Joan (Universitat Politècnica de Catalunya UPC, Terrassa, Spain) ; Germann, Urs (MeteoSwiss, Locarno, Switzerland) ; Rachidi, Farhad (EPFL, Lausanne, Switzerland)

In this paper we present an analysis of a large dataset of lightning and polarimetric weather radar data collected in the course of a lightning measurement campaign that took place in the summer of 2017 in the area surrounding Säntis, in the northeastern part of Switzerland. For this campaign and for the first time in the Alps, a lightning mapping array (LMA) was deployed. The main objective of the campaign was to study the atmospheric conditions leading to lightning production with a particular focus on the lightning discharges generated due to the presence of the 124 m tall Säntis telecommunications tower. In this paper we relate LMA very high frequency (VHF) sources data with co-located radar data in order to characterise the main features (location, timing, polarimetric signatures, etc.) of both the flash origin and its propagation path. We provide this type of analysis first for all of the data and then we separate the datasets into intra-cloud and cloud-to-ground flashes (and within this category positive and negative flashes) and also upward lightning. We show that polarimetric weather radar data can be helpful in determining regions where lightning is more likely to occur but that lightning climatology and/or knowledge of the orography and man-made structures is also relevant.


Article Type:
scientifique
Faculty:
Ingénierie et Architecture
School:
HEIG-VD
Institute:
IICT - Institut des Technologies de l'Information et de la Communication
Date:
2019-05
Pagination:
31 p.
Published in:
Atmospheric Measurement Techniques
Numeration (vol. no.):
2019, vol. 12, no. 5, pp.2881-2911
DOI:
ISSN:
1867-8548
Appears in Collection:



 Record created 2019-10-29, last modified 2019-10-29

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