Canada’s boreal forests are burning

And releasing loads of carbon.

 

Rumbling afternoon thundershowers are breaking over the Southwest, bringing gratitude and sweet relief – not that the region needed much relieving this year. Bouts of cool, wet weather throughout early summer helped stave off the conflagrations predicted to erupt after a dry winter, and by mid-July, most areas had already been deluged by a full month’s worth of rainfall. In other words, summer monsoon season has extinguished any lingering fears that 2014 would be a bad fire year.

“In a word, fire season was underwhelming,” says Chuck Maxwell, meteorologist at the National Interagency Fire Center's Predictive Services Group. “We had near normal to probably below-normal activity.”

But as the Southwest collectively inhales the smell of rain falling on dry land, parts of the Northwest and Western Canada are bathed in acrid smoke. Nearly a million acres are burning in Washington and Oregon alone – more than what typically burns over the course of a whole year. Some 12,000 firefighters have been deployed since the fires began earlier this month.

Yet though the deadly combination of drought and summer lightning strikes have led to a particularly severe fire season in eastern Washington and Oregon, some of the West’s biggest blazes are in Canada's Northwest Territories, where the total acreage burned so far this year is six times the 25-year average. In recent years, twice as much Canadian forest has been burning annually as in the 1970s, says University of Alberta wildland fire professor Mike Flannigan, and the northwestern part of the country is experiencing its hottest, driest summer in half a century. “What we are seeing in the Northwest Territories this year is an indicator of what to expect with climate change,” Flannigan says.

copy_of_taigafire.jpg
The Birch Creek fire complex in Canada's Northwest Territories. Courtesy Kelly Pennycook, Environment and Natural Resources, Government of the Northwest Territories, and Dennis Quintill, via NWTFire. Photograph taken July 14,2014.

While fires in sparsely populated northern Canada have less of an impact on human safety and infrastructure than those in the Pacific Northwest, their effect on the environment may be greater. The ancient, stunted boreal forests that ring the Arctic Circle contain 30 percent of the world's land-based carbon, and when they burn, that carbon is released into the atmosphere, exacerbating global warming.

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