The impact of climate change on the risk of forest and grassland fires in Australia

We explore the impact of future climate change on the risk of forest and grassland fires over Australia in January using a high resolution regional climate model, driven at the boundaries by data from a transitory coupled climate model. Two future emission scenarios (relatively high and relatively low) are used for 2050 and 2100 and four realizations for each time period and each emission scenario are run. Results show a consistent increase in regional-scale fire risk over Australia driven principally by warming and reductions in relative humidity in all simulations, under all emission scenarios and at all time periods. We calculate the probability density function for the fire risk for a single point in New South Wales and show that the probability of extreme fire risk increases by around 25% compared to the present day in 2050 under both relatively low and relatively high emissions, and that this increases by a further 20% under the relatively low emission scenario by 2100. The increase in the probability of extreme fire risk increases dramatically under the high emission scenario by 2100. Our results are broadly in-line with earlier analyses despite our use of a significantly different methodology and we therefore conclude that the likelihood of a significant increase in fire risk over Australia resulting from climate change is very high. While there is already substantial investment in fire-related management in Australia, our results indicate that this investment is likely to have to increase to maintain the present fire-related losses in Australia.

[1]  Roger A. Pielke,et al.  Interactions between the atmosphere and terrestrial ecosystems: influence on weather and climate , 1998 .

[2]  Tom Beer,et al.  Estimating australian forest fire danger under conditions of doubled carbon dioxide concentrations , 1995 .

[3]  M. Wehner.  A method to aid in the determination of the sampling size of AGCM ensemble simulations , 2000 .

[4]  Will Steffen,et al.  Global change and terrestrial ecosystems , 1996 .

[5]  G. Cary,et al.  Fire regimes in landscapes:models and realities , 2002 .

[6]  David Vose,et al.  Quantitative Risk Analysis: A Guide to Monte Carlo Simulation Modelling , 1996 .

[7]  M. Webb,et al.  Quantification of modelling uncertainties in a large ensemble of climate change simulations , 2004, Nature.

[8]  A. Pitman,et al.  The Effect of Including Biospheric Responses to CO2 on the Impact of Land-Cover Change over Australia , 2004 .

[9]  J. Balmes,et al.  The effect of smoke inhalation on lung function and airway responsiveness in wildland fire fighters. , 1992, The American review of respiratory disease.

[10]  Richard G. Jones,et al.  Simulation of climate change over europe using a nested regional‐climate model. I: Assessment of control climate, including sensitivity to location of lateral boundaries , 1995 .

[11]  A. Gill,et al.  Some ecological research perspectives on the disastrous Sydney fires of January 1994 , 1994 .

[12]  G. Cary.  Importance of a changing climate for fire regimes in Australia. , 2002 .

[13]  R. Pielke,et al.  A Climate Version of the Regional Atmospheric Modeling System , 2000 .

[14]  A. Pitman,et al.  Impact of land cover change on the climate of southwest Western Australia , 2004 .

[15]  R. Pielke,et al.  A comprehensive meteorological modeling system—RAMS , 1992 .

[16]  R J Conroy.  To burn or not to burnq A description of the historyc nature and management of bushfires within Ku-Ring- Gai Chase National Park , 1996 .

[17]  N. A. Mcarthur,et al.  Building in a fire-prone environmentc research on building survival in two major bushfires , 1996 .

[18]  Geoffrey J. Cary,et al.  Fire Regime Sensitivity to Global Climate Change: An Australian Perspective , 2000 .

[19]  James S. Clark,et al.  A history of fire in Australia , 2002 .

[20]  W. Cotton,et al.  The Physics of the Marine Stratocumulus-Capped Mixed Layer. , 1987 .

[21]  Nigel J. Tapper,et al.  The Sensitivity of Australian Fire Danger to Climate Change , 2001 .

[22]  Alexei G. Sankovski,et al.  Special report on emissions scenarios , 2000 .

[23]  M. Sim.  Bushfires: are we doing enough to reduce the human impact? , 2002, Occupational and environmental medicine.

[24]  I. Watterson,et al.  Simulated changes due to global warming in daily precipitation means and extremes and their interpretation using the gamma distribution , 2003 .

[25]  W Ogana,et al.  Contribution of Working Group 1 to the Third Assessment Report of the Intergovernmental Panel on Climate Change , 2001 .

[26]  Roger A. Pielke,et al.  The impact of realistic biophysical parameters for eucalypts on the simulation of the January climate of Australia , 2005, Environ. Model. Softw..

[27]  Leon D. Rotstayn,et al.  The CSIRO 9-level atmospheric general circulation model , 1993 .

[28]  Roger A. Pielke,et al.  The impact of land cover change on storms in the Sydney Basin, Australia , 2006 .

[29]  A. Pitman,et al.  The Impact of 200 Years of Land Cover Change on the Australian Near-Surface Climate , 2003 .

[30]  A. Gill,et al.  Flammable Australia: The Fire Regimes and Biodiversity of a Continent , 2009 .

[31]  An Assessment of Possible Climate Change in the Australian Region Based on an Intercomparison of General Circulation Modeling Results , 1994 .

[32]  John S. Kain,et al.  Convective parameterization for mesoscale models : The Kain-Fritsch Scheme , 1993 .

[34]  F. Giorgi,et al.  Regional Climate Change Scenarios over the United States Produced with a Nested Regional Climate Model , 1994 .

[35]  Leonard A. Smith,et al.  Uncertainty in predictions of the climate response to rising levels of greenhouse gases , 2005, Nature.

[36]  J. Clark.  Twentieth-century climate change, fire suppression, and forest production and decomposition in northwestern Minnesota , 1990 .

[37]  K. Emanuel,et al.  The Representation of Cumulus Convection in Numerical Models , 1993 .

[38]  Russell Blong,et al.  Residential building damage and natural perils: Australian examples and issues , 2004 .

[39]  The human health impact of the 2001-2002 'Black Christmas' bushfires in New South Wales, Australia: an alternative multidisciplinary strategy. , 2004 .

[40]  J. Houghton,et al.  Climate change 2001 : the scientific basis , 2001 .

[41]  De Chen,et al.  GEMTM: a general model for energy and mass transfer of land surfaces and its application at the FIFE sites , 1994 .

[42]  Ian R. Noble,et al.  McArthur's fire-danger meters expressed as equations , 1980 .

[43]  Roger A. Pielke,et al.  The regional effects of CO2 and landscape change using a coupled plant and meteorological model , 2001 .

[44]  S. Ghan,et al.  Pacific Northwest Climate Sensitivity Simulated by a Regional Climate Model Driven by a GCM. Part I: Control Simulations , 1999 .

[45]  M. Castro,et al.  The impact of deforestation on the hydrological cycle in the western Mediterranean: an ensemble study with two regional climate models , 2001 .

[46]  René Laprise,et al.  Sensitivity of a regional climate model to the resolution of the lateral boundary conditions , 2003 .

[47]  R. O G E,et al.  Interactions between the atmosphere and terrestrial ecosystems : influence on weather and climate , 1998 .

[48]  Barrie Pittock,et al.  Climate Change: An Australian Guide to the Science and Potential , 2003 .