DOI: 10.1002/2017JD026577
论文题名: Pyrocumulonimbus lightning and fire ignition on Black Saturday in southeast Australia
作者: Dowdy A.J. ; Fromm M.D. ; McCarthy N.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 14 起始页码: 7342
结束页码: 7354
语种: 英语
英文关键词: extreme events
; lightning
; pyroconvection
; remote sensing
; thunderstorm
; wildfire
英文摘要: A number of devastating wildfires occurred in southeast Australia on 7 February 2009, colloquially known as Black Saturday. Atmospheric responses to this extreme fire event are investigated here with a focus on convective processes associated with fire activity (i.e., pyroconvection). We examine six different fire complexes on Black Saturday, finding three clearly distinct pyrocumulonimbus storms, the largest of which reached heights of 15 km on that day and generated hundreds of lightning strokes. The first lightning stroke was recorded near the largest fire complex 5 h after fire ignition. One of the pyrocumulonimbus storms was initiated close to midnight due to mesoscale influences, consistent with extreme fire behavior observed at that time for that particular fire. As another example of fire-atmosphere interactions, a fire that started late on Black Saturday is examined in relation to ignition caused by pyrogenic lightning, with implications for understanding the maximum rate of spread of a wildfire. Results are discussed in relation to another pyrocumulonimbus event associated with the 2003 Canberra fires. Our findings are intended to provide a greater understanding of pyroconvection and fire-atmosphere feedback processes, as well as help enhance wildfire response capabilities. We also demonstrate the potential for using lightning, radar, and satellite remote sensing in combination with thermodynamic analyses as well as synoptic and mesoscale dynamics to provide enhanced real-time guidance for dangerous fire conditions associated with pyroconvection, as well as for the risk of new fire ignitions from pyrogenic lightning. ©2017 Commonwealth of Australia. This article has been contributed to by US Government employees and their work is in the public domain in the USA. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62619
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Bureau of Meteorology, Docklands, VIC, Australia; Naval Research Laboratory, Washington, DC, United States; School of Earth and Environmental Sciences, University of Queensland, Brisbane, QLD, Australia
Recommended Citation:
Dowdy A.J.,Fromm M.D.,McCarthy N.. Pyrocumulonimbus lightning and fire ignition on Black Saturday in southeast Australia[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(14)