Frequency of wildfires expected to double by mid-century
By Summit Voice
SUMMIT COUNTY — This past summer’s drought and destructive wildfires in Colorado showed how just a short period of hot, dry weather intensifies fire conditions, and there’s more and more research suggesting that global warming will make things worse in the next few decades.
In one of the most recent studies, NASA scientists reported this week that wildfire activity is likely to increase significantly by the middle of the century, putting natural resources and human developments at even greater risk.
“Climate models project an increase in fire risk across the U.S. by 2050, based on a trend toward drier conditions that favor fire activity and an increase in the frequency of extreme events,” said Doug Morton, of NASA’s Goddard Space Flight Center.
Morton presented the new analysis of future U.S. fire activity this week at the annual meeting of the American Geophysical Union in San Francisco. The analysis was based on current fire trends and predicted greenhouse gas emissions.
The researchers calculated results for low and high greenhouse gas emissions scenarios. In both cases, results suggest more fire seasons that are longer and stronger across all regions of the U.S. in the next 30-50 years. Specifically, high fire years like 2012 would likely occur two to four times per decade by mid-century, instead of once per decade under current climate conditions.
Through August of this year, the U.S. burned area topped 6.17 million acres, short of the record 7.9 million acres burned in 2011, but greater than the area burned during 12 of the 15 years since record keeping began in 1997. This and other satellite records, along with more refined climate and emissions models, are allowing scientists to tease out new information about fire trends.
“Fire is an inherently global phenomenon, and the only practical way to track large-scale patterns and changes in fire activity is with satellites,” said Louis Giglio, of the University of Maryland at College Park and Goddard.
As the U.S. land area burned by fire each year has increased significantly in the past 25 years, so too have the emissions. Carbon dioxide emissions from wildfires in the western U.S. have more than doubled since the 1980s, according to Chris Williams of Clark University in Worcester, Mass.
The satellite-based view allowed Williams and his colleagues to quantify how much carbon has been released from fires in the U.S. West. The team used data on fire extent and severity derived from Landsat satellites to calculate how much biomass is burned and killed, and how quickly the associated carbon was released to the atmosphere.
The team found carbon emissions from fires have grown from an average of 8 teragrams (8.8 million tons) per year from 1984 to 1995 to an average of 20 teragrams (22 million tons) per year from 1996 to 2008, increasing 2.4 times in the latter period.
“With the climate change forecast for the region, this trend likely will continue as the western U.S. gets warmer and drier on average,” Williams said. “If this comes to pass, we can anticipate increased fire severity and an even greater area burned annually, causing a further rise in the release of carbon dioxide.”
The analysis by Morton and colleagues used climate projections, prepared for the Fifth Assessment Report of the United Nations Intergovernmental Panel on Climate Change, to examine how dryness, and therefore fire activity, is expected to change.
From a fire and emissions management perspective, wildfires are not the entire U.S. fire story, according to research by Hsiao-Wen Lin of the University of California at Irvine. Satellite data show agricultural and prescribed fires are a significant factor and account for 70 percent of the total number of active fires in the continental U.S. Agricultural fires have increased 30 percent in the last decade.
In contrast with wildfires, agricultural and prescribed fires are less affected by climate, especially drought, during the fire season.
“That means there is greater potential to manage fire emissions, even in a future, drier climate with more wildfires. We need to use cost-benefit analysis to assess whether reductions in agricultural fire emissions — which would benefit public health — would significantly impact crop yields or other ecosystem services,” Lin said.