Meteorological aspects of self‐initiated upward lightning at the Säntis tower (Switzerland)

Pineda, Nicolau (Remote Sensing Unit, Meteorological Service of Catalonia, Barcelona, Spain ; Lightning Research Group, Technical University of Catalonia, Spain) ; Figueras i Ventura, Jordi (Radar, Satellite and Nowcasting Division, MeteoSwiss, Locarno-Monti, Switzerland) ; Romero, David (Lightning Research Group, Technical University of Catalonia, Spain) ; Mostajabi, Amirhossein (Electromagnetic Caompatibility Laboratory, Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland) ; Azadifar, Mohammad (School of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland) ; Sunjerga, Antonio (Electromagnetic Caompatibility Laboratory, Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland) ; Rachidi, Farhad (Electromagnetic Caompatibility Laboratory, Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland) ; Rubinstein, Marcos (School of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland) ; Montanyà, Joan (Lightning Research Group, Technical University of Catalonia, Spain) ; van der Velde, Oscar (Lightning Research Group, Technical University of Catalonia, Spain) ; Altube, Patricia (Remote Sensing Unit, Meteorological Service of Catalonia, Barcelona, Spain) ; Besic, Nikola (Electromagnetic Compatibility Laboratory, Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland ; Environmental Remote Sensing Laboratory, Swiss Federal Institute of Technology (EPFL), Lausanne, Lausanne, Switzerland) ; Grazioli, Jacopo (Radar, Satellite and Nowcasting Division, MeteoSwiss, Locarno-Monti, Switzerland) ; Germann, Urs (Radar, Satellite and Nowcasting Division, MeteoSwiss, Locarno-Monti, Switzerland) ; Williams, Earle R. (Massachusetts Institute of Technology, Cambridge, Massachusetts, USA)

Interest in exploring the meteorological conditions favoring upward lightning from tall man‐made structures has grown in recent years, largely due to the worldwide expansion of wind energy. To this end, instrumented towers existing around the world are the most suitable places to study upward lightning. In this context, an LMA network was deployed around the Säntis Mountain (northeast Switzerland) during the summer of 2017, in order to complement the long‐term measurements currently held at the Säntis telecommunications tower, a lightning hotspot in Central Europe. This campaign allowed, for the first time, to gather a comprehensive set of observations of self‐initiated upward lightning emerging from the Tower. With the help of C‐band dual‐polarimetric radar data, the present work focuses on the meteorological conditions conductive to self‐initiated upward lightning from the Säntis. The analysis revealed that the upward‐propagating positively‐charged leaders spread mostly horizontal above the melting level, after an initial short vertical path from the tower tip. After this initial stage, the majority of upward leaders were followed by a sequence of negative return strokes. The inception upward lightning under a stratiform cloud shield would be favored by the low height of the charge structure. From the obtained results, it turns out that a key feature favoring self‐initiated upward lightning would be the proximity of the tower tip to the melting level.


Article Type:
scientifique
Faculty:
Ingénierie et Architecture
School:
HEIG-VD
Institute:
IICT - Institut des Technologies de l'Information et de la Communication
Date:
2019-10
Pagination:
35 p.
Published in:
Journal of Geophysical Research: Atmospheres
Numeration (vol. no.):
12-2019, vol. 124, no 24, pp. 14162-14183
DOI:
ISSN:
2169-897X
Appears in Collection:



 Record created 2019-11-26, last modified 2020-05-01

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