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Modeling very large-fire occurrences over the continental United States from weather and climate forcing

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Environmental Research Letters

IOP Publishing

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      Warming and earlier spring increase western U.S. forest wildfire activity.

      Western United States forest wildfire activity is widely thought to have increased in recent decades, yet neither the extent of recent changes nor the degree to which climate may be driving regional changes in wildfire has been systematically documented. Much of the public and scientific discussion of changes in western United States wildfire has focused instead on the effects of 19th- and 20th-century land-use history. We compiled a comprehensive database of large wildfires in western United States forests since 1970 and compared it with hydroclimatic and land-surface data. Here, we show that large wildfire activity increased suddenly and markedly in the mid-1980s, with higher large-wildfire frequency, longer wildfire durations, and longer wildfire seasons. The greatest increases occurred in mid-elevation, Northern Rockies forests, where land-use histories have relatively little effect on fire risks and are strongly associated with increased spring and summer temperatures and an earlier spring snowmelt.
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        Ecoregions of the Conterminous United States

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          Implications of changing climate for global wildland fire

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            Author and article information

            Journal
            Environmental Research Letters
            Environ. Res. Lett.
            IOP Publishing
            1748-9326
            December 01 2014
            December 01 2014
            : 9
            : 12
            : 124009
            10.1088/1748-9326/9/12/124009
            © 2014

            http://iopscience.iop.org/info/page/text-and-data-mining

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