An introduction to patterns of fire in arid and semi-arid Australia, 1998–2004
D. Turner A B C , B. Ostendorf A B and M. Lewis A BA School of Earth and Environmental Sciences, The University of Adelaide, PMB 1, Urrbrae, SA 5064, Australia.
B Desert Knowledge CRC, PO Box 3971, Alice Springs, NT 0871, Australia.
C Corresponding author. Email: dorothy.turner@student.adelaide.edu.au
The Rangeland Journal 30(1) 95-107 https://doi.org/10.1071/RJ07039
Submitted: 9 June 2007 Accepted: 13 November 2007 Published: 1 April 2008
Abstract
Fire is a crucial element in shaping our world, whether of natural or anthropogenic origin. These fires can have both positive and negative consequences and impacts on our natural environment, society and its economics, not to mention global climate.
Previous analyses of fire regimes in arid and semi-arid Australia have been of limited spatial or temporal extent. This lack of knowledge has hampered attempts at effective fire management. Satellite imagery allows the continuous detection, monitoring and mapping of fires. Active fires can be detected as fire hotspots, and burned areas mapped as patches from the change of surface reflectance properties in successive images. Data from NOAA’s advanced very high resolution radiometer (AVHRR) were used to assess the distribution, seasonality, frequency, number and extent of fire hotspots (FHS) and fire affected areas (FAA) across the entire arid and semi-arid country of Australia from 1998 to 2004.
Utilising both of these fire datasets is important, as they complement each other and provide a more robust analysis of fire patterns. Between 1998 and 2004 almost 27% of arid and semi-arid Australia burnt at least once. The main trends in fire distribution follow latitudinal rainfall gradients. Regression analysis also shows a strong relationship with the pattern of antecedent rainfall. The seasonality of fire events varies between climate zones in accordance with the varying distribution of precipitation and temperature, which influence fuel accumulation and curing.
For the first time we have a picture of fire patterns across the entire arid and semi-arid regions of the country. This includes several high fire years in certain areas following above-average rainfall. This analysis highlights similarities and differences between regions, giving policy makers and managers a basis from which to make more informed decisions in the present, and with which to compare future regimes.
Additional keywords: desert, fire regime, NOAA-AVHRR.
Acknowledgements
The fire data were assembled by the Satellite Remote Sensing Services, Dept. of Land Information, Government of Western Australia. We particularly wish to thank Richard Smith, Ron Craig, Belinda Heath and Agnes Kristina for their time and effort. We also wish to acknowledge valuable insight and support offered by Grant Allan from the Bushfires Council of the Northern Territory, Alice Springs and the Desert Knowledge CRC, and both Jeremy Russell-Smith and Andrew Edwards from the Bushfires Council of the Northern Territory, Darwin and the Tropical Savannas CRC. The research was funded by the Desert Knowledge CRC and the University of Adelaide.
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