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 GEP  Vol.8 No.8 , August 2020
Causes of Big Bushfires in Australia: Higher Temperatures and Rainfall or More Fuel?
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Abstract: The 2019-2020 bushfires in Australia caused the loss of 34 lives and an estimated 100 bn AU$ damage. This has sharpened the apparent division between Australians who believe that the increasing number of bushfires is due to climate change, and those who suggest that fuel loads must be managed more carefully. Bushfires whose area equals or exceeds 1 mHa have been analysed in this paper. The results show that the number, duration, and size have increased over the period 1850-2020, but that since 1953, there has been a downward trend in the number of big bushfires. There is a range of temperatures of about 20°C that are associated with the fires, with a modal temperature of 30°C - 32.5°C. Using an analysis of the maximum temperatures for the period 1970-2020 as a standard for comparison with bushfires for the period 1850-2020, shows that during bushfire events the standardised temperatures have a downward trend. This is most clearly shown by the application of the Fisher Exact Test. This suggests that the fuel load in forests is a key factor for bushfires. The role of pre-bushfire rainfall shows a rapid rise in the area burnt when the rainfall exceeds 150 mm month-1 which would lead to more plant growth and hence fuel load. The role of traditional burning over the whole of Australia is described based on documentary evidence. A tentative cost benefit analysis has shown that a comprehensive program of wildfire management is cost effective. The recommendations of previous research, National Inquiries and more recent management practices, have all failed to prevent the 2019-20 fire disaster in Australia.
Cite this paper: Clark, C. (2020) Causes of Big Bushfires in Australia: Higher Temperatures and Rainfall or More Fuel?. Journal of Geoscience and Environment Protection, 8, 79-94. doi: 10.4236/gep.2020.88007.
References

[1]   Abbott, I. (2003). Aboriginal Fire Regimes in South-West Western Australia: Evidence from Historical Documents. In Fire in Ecosystems of South-West Western Australia: Impacts and Management (pp. 119-146). Leiden, Netherlands: Backhuys Publishers.

[2]   Abbott, I., & Burrows, N. (2003). Fire in Ecosystems of South-West Western Australia: Impacts and Management (464 p). Leiden, Netherlands: Backhuys Publishers.

[3]   Altangerel, K., & Kull, C. A. (2013). The Prescribed Burning Debate in Australia: Conflicts and Compatibilities. Journal of Environmental Planning and Management, 56, 103-120. https://doi.org/10.1080/09640568.2011.652831

[4]   Ansell, J. et al. (2020). Contemporary Aboriginal Projects in Arnhem Land, a Regional Description and Analysis of the Fire Management Operations of Traditional Owners. International Journal of Wildland Fire, 29, 371-385.
https://doi.org/10.1071/WF18152

[5]   Ashcroft, L., Georgis, J., & Karoly, D. J. (2014). A Historical Climate Dataset for Southeastern Australia. Geoscience Data Journal, 1, 158-178.
https://doi.org/10.1002/gdj3.19

[6]   Ashe, B. S. W., McAneney, K. J., & Pitman, A. J. (2010). The Total Cost of Fire in Australia. Journal of Risk Research, 12, 121-136.

[7]   Attiwill, P. M., & Adams, M. A. (2013). Mega-Fires and Politics in the Eucalypt Forest of Victoria Southeast Australia. Forest Ecology & Management, 294, 45-53.
https://doi.org/10.1016/j.foreco.2012.09.015

[8]   Bird, D. W., Codding, B. F., Parker, C. H., & Jones, J. H. (2009). The “Fire Stick Farming” Hypothesis: Australian Aborigines Foraging Strategies, Biodiversity, and Anthropogenic fire Mosaics. Proceedings of the National Academy of Sciences of the United States of America, 105, 14796-14801.
https://doi.org/10.1073/pnas.0804757105

[9]   Boer, M. M., Sadler, R. J., & Wittkhun, R. (2009). Long-Term Impacts of Prescribed Burning on Regional Extent and Incidence of Wildfires—Evidence from 50 Years of Active Fire Management in SW Australian Forests. Forest Ecology and Management, 259, 132-142. https://doi.org/10.1016/j.foreco.2009.10.005

[10]   Bowman, D. M. J. S. (1998). The Impact of Aboriginal Burning on the Australian Biota. New Phytologist, 140, 385-410.
https://doi.org/10.1046/j.1469-8137.1998.00289.x

[11]   Bowman, D. M. J. S. (2003). Australian Landscape Burning: A Continental and Evolutionary Perspective. In Fire in Ecosystems of South-West Western Australia: Impacts and Management (pp 107-118). Leiden, Netherlands: Backhuys Publishers.

[12]   Bowman, D. M. J., Murphy, B. P., Williamson, G. J., & Cochrane, M. A. (2014). Pyrogeographic Models, Feedbacks and the Future of Global Fire Regimes. Global Ecology and Biogeography, 23, 821-824.
https://doi.org/10.1111/geb.12180

[13]   Bradstock, R. A., Cohn, J. S., Gill, A. M., Bedward, M., & Lucas, C. (2009). Prediction of the Probability of Large Fires in the Sydney Region of South-Eastern Australia Using Components of Fire Weather. International Journal of Wildland Fire, 18, 932-943.
https://doi.org/10.1071/WF08133

[14]   Bunbury, W. S., & Morrell, W. P. (Eds.) (1930). Early Days in Western Australia. London: Oxford University Press.

[15]   Burrows, N. D., Burbidge, A. A., Fuller, P. J., & Behn, G. (2006). Evidence of Altered Fire Regimes in the Western Desert Region of Australia. Conservation Science, 5, 272-284.

[16]   Burrows, N., & McCaw, L. (2013). Prescribed Burning in Southwestern Australian Forests. Frontiers in Ecological Environment, 11, e25-e34.
https://doi.org/10.1890/120356

[17]   Butler, R. J., Barrett, P. M., Penn, M. G., & Kenrick, P. (2010). Testing Coevolutionary Hypotheses over Geological Timescales: Interactions between Cretaceous Dinosaurs and Plants. Biological Journal of the Linnean Society, 100, 1-15.
https://doi.org/10.1111/j.1095-8312.2010.01401.x

[18]   Cheney, N. P. (1995). Bushfires—An Integral Part of Australia’s Environment. Year Book Australia, Melbourne.

[19]   Clark C. (2020). Downward Trend in the Frequency of Destructive Hailstorms in England and Wales. Journal of Geoscience and Environment Protection, 8, 57-70.
https://doi.org/10.4236/gep.2020.84005

[20]   Climate Council (2017). Climate Change and the Victoria Bushfire Threat: Update 2017 (36 p).

[21]   Climate Council (2019). Briefing Paper 12 November 2019 (14 p).

[22]   Dawson, R. (1830). The Present State of Australia. Alburgh, UK.

[23]   Dutta, R., Das, A., & Anjal, J. (2014). Big Data Integration Shows Bush Fire Frequency Is Increasing Significantly. Royal Society Open Science, 3, Article ID: 150241.
https://doi.org/10.1098/rsos.150241

[24]   Ellis, S., Kanowski, P., & Whelen, R. (2004). National Inquiry on Bushfire Mitigation and Management. Canberra, Commonwealth of Australia.

[25]   FAO (2009). Eucalyptus in East Africa: The Socio-Economic and Environmental Issues. (46 p). Addis Ababa.

[26]   Florec, V. (2016). Economic Analysis of Prescribed Burning in the South-West of Western Australia. PhD Thesis, Perth: University of Western Australia.

[27]   Gammage, B. (2011). The Biggest Estate on Earth, How Aborigines Made Australia (434 p). Crows Nest, NSW: Allen and Unwin.

[28]   Harris, S., Nicholls, N., Tapper, N., & Mills, G. (2020). Sensitivity of Fire Activity to Inter-Annual Climate Variability in Victoria Australia. Journal of Southern Hemisphere Earth Systems Science, 69, 146-160.
https://doi.org/10.1071/ES19008

[29]   Haydon, G. H. (1846). Five Years’ Experience in Australia. Felix, Melbourne.

[30]   Hoaglin, D. C. Mosteller, F., & Tukey, J. W. (1983). Understanding Robust and Exploratory Data Analysis (447 p). New York: John Wiley.

[31]   Jones, R. (1969). Fire-Stick Farming. Australian Natural History, 16, 224-228.

[32]   Keeley, J. E., & Syphard, A. D. (2016). Climate Change and Future Fire Regimes: Examples from California. Geosciences, 6, 37.
https://doi.org/10.3390/geosciences6030037

[33]   Kimber, R. (1983). Black Lightning Aborigines and Fire in the Central Australian and Western Desert. Archaeology in Oceania, 18, 38-45.
https://doi.org/10.1002/arco.1983.18.1.38

[34]   Ladds, M., Keating, A., Handmer, J., & Magee, L. (2017). How Much Do Disasters Cost? A Comparison of Disaster Costs in Australia. International Journal of Disaster Risk Reduction, 21, 419-429.
https://doi.org/10.1016/j.ijdrr.2017.01.004

[35]   Linacre, E., & Hobbs, J. (1977). The Australian Climatic Environment (354 p). Brisbane: Wiley.

[36]   Lucas, C. (2010). On Developing a Historical Fire Weather Data-Set for Australia. Australian Meteorological & Oceanographic Journal, 60, 1-14.
https://doi.org/10.22499/2.6001.001

[37]   Lucas, C., Hennessy, K., Mills, G., & Bathols, J. (2007). Bushfire Weather in South-East Australia: Recent Trends and Projected Climate Change Impacts. (80 p). Consultancy Report for the Climate Institute of Australia.

[38]   Lullfitz, A., Dortch, J., Hopper, S. D., Pettersen, C., Reynolds, R., & Guilfoyle, D. (2017). Human Niche Construction: Noongar Evidence in Pre-Colonial Southwestern Australia. Conservation and Society, 15, 201-216.

[39]   Malaspinas, A. S. et al. (2016). A Genomic History of Aboriginal Australia. Nature, 538, 207-214. https://doi.org/10.1038/nature18299

[40]   McCaw, L., Hamilton, T., & Rumley, C. (2005). Application of Fire History Records to Contemporary Management Issues in South-West Australian Forests. In Proceedings of the 6th National Conference of the Australian Forest History Society (pp 555-564). Rotterdam: Millpress.

[41]   Meyn, A., White, P. S., Buhlc, C., & Jentsch, A. (2007). Environmental Drivers of Large, Infrequent wildfires: The Emerging Conceptual Model. Progress in Physical Geography, 31, 287-312.
https://doi.org/10.1177/0309133307079365

[42]   Morgan, G. W. et al. (2020). Prescribed Burning in South-Eastern Australia: History and Future Directions. Australian Forestry, 83, 4-28.
https://doi.org/10.1080/00049158.2020.1739883

[43]   Mossman, S., & Banister, T. (1853). Australia Visited and Revisited. London: Addey and Co.

[44]   Preece, N. (2002). Aboriginal Fires in Monsoonal Australia from Historical Accounts. Journal of Biogeography, 29, 321-336.
https://doi.org/10.1046/j.1365-2699.2002.00677.x

[45]   Pyne, S. J. (1991). Burning Bush a Fire History of Australia (520 p). New York: Henry Holt.

[46]   Ravi, V., Vaughan, J. K., Waolcott, M. P., & Lamb, B. K. (2019). Impacts of Prescribed Fires and Benefits from Their Reduction for Air Quality, Health, and Visibility in the Pacific Northwest of the United States. Journal of the Air and Water Management Association, 69, 289-304. https://doi.org/10.1080/10962247.2018.1526721

[47]   Riffenburgh, R. H. (2005). Statistics in Medicine (2nd Ed.). London: Academic Press.

[48]   Russell-Smith, J., McCaw, L., & Leavesley, A. (2020). Adaptive Prescribed Burning in Australia for the 21st Century—Context, Status, Challenges. International Journal of Wildland Fire, 29, 305-313.
https://doi.org/10.1071/WF20027

[49]   Russell-Smith, J., Whitehead, P., & Cooke, P. (2009). Culture Ecology and Economy of Fire Management in Northern Australian Savannas: Rekindling the Wurrk Tradition (417 p). Canberra: CSIRO Publication.
https://doi.org/10.1071/9780643098299

[50]   Siegel, S. (1956). Non-Parametric Statistics (312 p). New York: McGraw Hill.

[51]   Smith, R. (2007). Key Issues Identified from Operational Reviews of Major Fires in Victoria 2006/7 (94 p). Melbourne: Victoria Department of Sustainability and Environment.

[52]   Tourism Research Australia (2019). Tourism Forecasts (18 p). Canberra: Australian Trade and Investment Commission.

[53]   van Nood, E. et al. (2013). Duodenal Infusion of Donor Faeces for Recurrent Clostridium difficile. New England Journal of Medicine, 368, 407-415.
https://doi.org/10.1056/NEJMoa1205037

[54]   World Meteorological Organisation (WMO) (2007). Guidelines on the Calculation of Climatic Normals (18 p). WMO.

[55]   Yu, P., Xu, R., Abramson, M. J., Shanshan, L., & Guo, L. (2020). Bushfires in Australia: A Serious Health Emergency under Climate Change. The Lancet Planetary Health, 4, e7-e8. https://doi.org/10.1016/S2542-5196(19)30267-0

 
 
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