NWT Forest Fires Already 6X 25-Year Average; Birch Creek Fire Complex @ 250,000 Acres

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An aerial view of the Birch Creek Fire complex, which seared 250,000 acres as of Wednesday.

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In addition, soot from forest fires can also darken ice in the Arctic and melt it faster. The 2012 fires in Siberia released so much soot that they helped create a shocking melt of Greenland’s ice sheet. Over the course of a few weeks in July that year, 95 percent of the surface melted. That could become a yearly occurrence by 2100 if temperatures continue to rise along with wildfire activity.

Forest in other parts of the globe are also feeling the effects of climate change. In the western U.S., wildfire season has lengthened by 75 days compared to 40 years ago. Additionally, rising temperatures and shrinking snowpack have helped drive an increase in the number of large forest fires. In Australia, fire danger is also increasing, if not the total number of fires, due to a similar trend of hotter, dryer weather.

Perhaps not surprisingly then, the current Northwest Territories fires have been fueled by hot and dry weather. Yellowknife’s June high temperatures were 3.8°F above normal highs while rainfall was only 15 percent of normal. Through July 15, high temperatures have been running 4°F above July averages and the city has only seen 2 percent of its normal rainfall for the month. While these conditions can't be tied specifically to climate change, they're in line with those trends.

The fires have shut down parts of territory’s Highway 3, a main thoroughfare, and inundated Yellowknife with a thick haze of smoke and ash. The city’s 19,000 residents are also under a health warning. At points last week, the smoke plume was whisked south across the provinces of Alberta and Saskatchewan and even reaching the Dakotas, 2,000 miles away.

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http://www.climatecentral.org/news/nw-fires-weather-climate-change-boreal-forests-17778