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Title:
Warming and Earlier Spring Increase Western U.S. Forest Wildfire Activity
Authors:
Westerling, A. L.; Hidalgo, H. G.; Cayan, D. R.; Swetnam, T. W.
Affiliation:
AA(Scripps Institution of Oceanography, La Jolla, CA 92093, USA.; University of California, Merced, CA 95344, USA.), AB(Scripps Institution of Oceanography, La Jolla, CA 92093, USA.), AC(Scripps Institution of Oceanography, La Jolla, CA 92093, USA.; U.S. Geological Survey, La Jolla, CA 92093, USA.), AD(Laboratory of Tree-Ring Research, University of Arizona, Tucson, AZ 85721, USA.)
Publication:
Science, Volume 313, Issue 5789, pp. 940-943 (2006). (Sci Homepage)
Publication Date:
08/2006
Category:
ATMOS
Origin:
SCIENCE
DOI:
10.1126/science.1128834
Bibliographic Code:
2006Sci...313..940W

Abstract

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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