'Zombie fires' are already smoldering in the Arctic. They could become more common as the planet warms

Smoke rises from a fire in Alaska's Yukon Delta National Wildlife Refuge in 2015. A new study finds that wildfires in boreal forests and peatlands of the Arctic can sometimes spawn "zombie fires," which can burn all the way through winter.

(CNN)As global temperatures rise, the once reliably frozen Arctic has seen a rash of massive wildfires in recent years.

And while biting winter cold and heavy snow are enough to eventually suppress most blazes, scientists say the right conditions can create fires that just will not die.