Abstract
Although an increasing frequency of forest fires has been suggested as a consequence of global warming, there are no empirical data that have shown climatically driven increases in fire frequency since the warming that has followed the end of the “Little Ice Age” (~1850). In fact, a 300-year fire history (AD 1688–1988) from the Lac Duparquet area (48°28'N, 79°17'W) shows a significant decrease both in the number and extent of fires starting 100 years ago during a period of warming. To explore this relationship between climatic change and fire frequency we used daily data from the Canadian Atmospheric Environment Service’s General Circulation Model to calculate components of the Canadian Forest Fire Weather Index (FWI) System for the 1×CO2 and 2xCO2 scenarios. The average FWI over much of eastern Canada, including the Lac Duparquet region, decreased under the 2×CO2 simulation, whereas FWI increased dramatically over western Canada. According to these results, fire frequency would decrease over the southeastern boreal forest which is in agreement with the empirical data from the fire history. Our results stress the importance of large regional variability and call into question previous generalisations suggesting universal increases in the rate of disturbance with climate warming.
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Bergeron, Y., Flannigan, M.D. (1995). Predicting the Effects of Climate Change on Fire Frequency in the Southeastern Canadian Boreal Forest. In: Apps, M.J., Price, D.T., Wisniewski, J. (eds) Boreal Forests and Global Change. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0942-2_41
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DOI: https://doi.org/10.1007/978-94-017-0942-2_41
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