Anthropogenic influence on recent severe autumn fire weather in the west coast of the United States
Linnia R. Hawkins1, John T. Abatzoglou2, Sihan Li3,4, David E. Rupp5
1-Forest Ecosystems & Society, Oregon State University, Corvallis, OR, USA 2-Management of Complex Systems, University of California, Merced, Merced, CA, USA 3-Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford, UK 4-Oxford e‐Research Centre, University of Oxford, Oxford, UK, 5-Oregon Climate Change Research Institute, College of Earth, Ocean, and Atmospheric Science, Oregon State University, Corvallis, OR, USA
Abstract
Extreme wind-driven autumn wildfires are hazardous to life and property, due to their rapid rate of spread. Recent catastrophic autumn wildfires in the western United States co-occurred with record- or near-record autumn fire weather indices that are a byproduct of extreme fuel dryness and strong offshore dry winds. Here, we use a formal, probabilistic, extreme event attribution analysis to investigate anthropogenic influence on recent extreme autumn fire weather events. We show that while present-day anthropogenic climate change has slightly decreased the prevalence of strong offshore downslope winds, it has increased the likelihood of extreme fire weather indices by 40%, primarily through increased autumn fuel aridity and warmer temperatures during dry wind events. These findings illustrate that anthropogenic climate change is exacerbating autumn fire weather extremes that contribute to high-impact catastrophic fires in populated regions of the western US.