A fire fighter works the line during the 2004 Alaska Solstice Complex fire. (Photo courtesy the Alaska Fire Service.)
This MOPITT image shows plumes of carbon monoxide streaming from Alaskan fires across North America and the Atlantic during mid-July 2004. (Image courtesy the NCAR MOPITT Team.)
Wildfires in Alaska and Canada in 2004 emitted about as much carbon monoxide as did human-related activities in the continental United States during the same time period, according to new research by the National Center for Atmospheric Research (NCAR). The fires also increased atmospheric concentrations of ground-level ozone across much of the Northern Hemisphere.
The NCAR study, which indicates the extent to which wildfires contribute to atmospheric pollution, was published this month in Geophysical Research Letters. The researchers used a novel combination of observing instruments, computer models, and numerical techniques that allowed them to distinguish between carbon monoxide coming from the wildfires and from other sources.
The team concluded that the Alaskan and Canadian wildfires emitted about 30 teragrams of carbon monoxide from June through August of last year. Because of the wildfires, ground-level concentrations of ozone increased by 25% or more in parts of the northern continental United States and by 10% as far away as Europe.
Nicole Gordon | EurekAlert!
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