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Can global models reproduce the current increase in Western United States Wildfires and project a reliable future trend?

Dominique Bachelet¹, Dave Conklin², Brendan Rogers³, Maureen McGlinchy³, Jim Lenihan⁴, Ron Neilson⁴ & Ray Drapek⁴

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1. Conservation Biology Institute
2. Dept Biological and Ecological Engineering, Oregon State University
3. Oregon State University
4. PNW U.S. Forest Service

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Presentation

Date:

Received 14 August 2009 21:18 UTC; Posted 17 August 2009

Subjects:

Ecology, Earth & Environment

Tags:

• dynamic global vegetation model
• fire
• climate change
• western usersguide.

Abstract:

Background/Question/Methods:
Wildfires in the western U.S. are generally thought to have increased since the 1980s. Many factors have contributed to this increase such as fire suppression, livestock grazing, and urban sprawl. Fires have also been associated with variations in sea surface temperatures and described by indices such as El Niño Southern Oscillation (ENSO), the Pacific Decadal Oscillation (PDO), and the Atlantic Multidecadal Oscillation (AMO). Recent analyses have also shown that we may have entered a new fire regime starting with a climate shift in 1998 and are currently entering years of combined long-term warm AMO phase with cool ENSO and PDO phases usually associated with increased drought-induced fires in the interior West. Moreover, while the increase in atmospheric CO2 is likely increasing water use efficiency and thus reducing drought stress in western ecosystems, it may also have enhanced fuel build-up as warm temperatures enhance growth and thus contribute to larger fires during extreme drought conditions.

Results/Conclusions:
We have run our dynamic vegetation model MC1 in the conterminous United States at various spatial resolutions (grain) and documented the relative importance of climate and CO2 on historical fires (1895-2006) using continental (2500km2 pixels), regional (100km2 pixels), and local (0.64km2) climate and soil datasets. We will present some of our results at those various scales, compare them to observations, and discuss scaling issues.

Collection:

2009 Annual Meeting of the Ecological Society of America

Presented at:

94th Annual Meetings of the Ecological Society of America, 06 August 2009

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License:

This document is licensed to the public under the Creative Commons Attribution 3.0 License

How to cite this document:

Bachelet, Dominique , Conklin, Dave, Rogers, Brendan, McGlinchy, Maureen, Lenihan, Jim, Neilson, Ron, and Drapek, Ray. Can global models reproduce the current increase in Western United States Wildfires and project a reliable future trend?. Available from Nature Precedings <http://dx.doi.org/10.1038/npre.2009.3618.1> (2009)

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