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Characterizing spatial and temporal variability of lightning activity associated with wildfire over Tasmania, Australia

Citation

Nampak, H and Love, P and Fox-Hughes, Paul and Watson, C and Aryal, J and Harris, RMB, Characterizing spatial and temporal variability of lightning activity associated with wildfire over Tasmania, Australia, Fire, 4, (1) Article 10. ISSN 2571-6255 (2021) [Refereed Article]


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Copyright Statement

Copyright 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/4.0/).

DOI: doi:10.3390/fire4010010

Abstract

Lightning strikes are pervasive, however, their distributions vary both spatially and in time, resulting in a complex pattern of lightning-ignited wildfires. Over the last decades, lightning-ignited wildfires have become an increasing threat in south-east Australia. Lightning in combination with drought conditions preceding the fire season can increase probability of sustained ignitions. In this study, we investigate spatial and seasonal patterns in cloud-to-ground lightning strikes in the island state of Tasmania using data from the Global Position and Tracking System (GPATS) for the period January 2011 to June 2019. The annual number of lightning strikes and the ratio of negative to positive lightning (78:22 overall) were considerably different from one year to the next. There was an average of 80 lightning days per year, however, 50% of lightning strikes were concentrated over just four days. Most lightning strikes were observed in the west and north of the state consistent with topography and wind patterns. We searched the whole population of lightning strikes for those most likely to cause wildfires up to 72 h before fire detection and within 10 km of the ignition point derived from in situ fire ignition records. Only 70% of lightning ignitions were matched up with lightning records. The lightning ignition efficiency per stroke/flash was also estimated, showing an annual average efficiency of 0.24% ignition per lightning stroke with a seasonal maximum during summer. The lightning ignition efficiency as a function of different fuel types also highlighted the role of buttongrass moorland (0.39%) in wildfire incidents across Tasmania. Understanding lightning climatology provides vital information about lightning characteristics that influence the probability that an individual stroke causes ignition over a particular landscape. This research provides fire agencies with valuable information to minimize the potential impacts of lightning-induced wildfires through early detection and effective response.

Item Details

Item Type:Refereed Article
Keywords:lightning activity, Tasmania, wildfire, ignition efficiency
Research Division:Earth Sciences
Research Group:Climate change science
Research Field:Climatology
Objective Division:Environmental Management
Objective Group:Air quality, atmosphere and weather
Objective Field:Weather
UTAS Author:Nampak, H (Miss Haleh Nampak)
UTAS Author:Love, P (Dr Peter Love)
UTAS Author:Watson, C (Dr Christopher Watson)
UTAS Author:Aryal, J (Dr Jagannath Aryal)
UTAS Author:Harris, RMB (Dr Rebecca Harris)
ID Code:144600
Year Published:2021
Web of Science® Times Cited:1
Deposited By:Geography and Spatial Science
Deposited On:2021-05-30
Last Modified:2021-06-23
Downloads:6 View Download Statistics

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