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International Journal of Wildland Fire International Journal of Wildland Fire Society
Journal of the International Association of Wildland Fire
RESEARCH ARTICLE

Comparing the height and area of wild and prescribed fire particle plumes in south-east Australia using weather radar

Owen F. Price A D , Phil J. Purdam B , Grant J. Williamson C and David M. J. S. Bowman C
+ Author Affiliations
- Author Affiliations

A Centre for Environmental Risk Management of Bushfire, University of Wollongong, Wollongong, NSW 2522, Australia.

B Retired, formerly at Bureau of Meteorology Centre for Australian Weather and Climate Research, 700 Collins Street, Docklands, Vic. 3008, Australia.

C School of Biological Sciences, University of Tasmania, Hobart, Tas. 7001, Australia.

D Corresponding author. Email: oprice@uow.edu.au

International Journal of Wildland Fire 27(8) 525-537 https://doi.org/10.1071/WF17166
Submitted: 5 April 2017  Accepted: 13 June 2018   Published: 13 July 2018

Abstract

Smoke pollution from landscape fires is a major health issue. Prescribed burning aims to reduce the area and impact of wildfire, but itself produces smoke pollution. This raises the question as to whether the smoke production and transport from prescribed fires is substantially different compared to wildfires. We examined the maximum height, width and areal footprint of large-particle plumes from 97 wild and 126 prescribed fires in south-eastern Australia using the existing network of weather radars. Radar detects large particles in smoke (probably those >100 μm) and hence is an imperfect proxy for microfine (<2 μm) particles that are known to affect human health. Of the 223 landscape fires, ~45% of plumes were detected, with the probability being >0.8 for large fires (>100 000 ha) regardless of type, closer than 50 km from the radar. Plume height was strongly influenced by fire area, the height of the planetary boundary layer and fire type. Plume heights differed between wildfire (range 1016–12 206 m, median 3260 m) and prescribed fires (range 706–6397 m, median 1669 m), and prescribed fires were predicted to be 800–1200 m lower than wildfires, controlling for other factors. For both wildfires and prescribed fires, the maximum plume footprint was always near the ground.

Additional keywords: 3D Rapic, injection height, rain radar, particulates, smoke plume, smoke pollution.


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