The number of wildland fires burning in the Arctic is on the rise, according to NASA researchers. Moreover, these blazes are burning larger, hotter, and longer than they did in previous decades.
These trends are closely tied to the region’s rapidly changing climate. The Arctic is warming nearly four times faster than the global average, a shift that directly impacts rain and snow in the region and decreases soil moisture, both of which make the landscape more flammable. Lightning, the primary ignition source of Arctic fires, is also occurring farther north. These findings are detailed in a report published in 2025 by the Arctic Monitoring and Assessment Programme (AMAP), a working group of the Arctic Council.
“Fire has always been a part of boreal and Arctic landscapes, but now it’s starting to act in more extreme ways that mimic what we’ve seen in the temperate and the tropical areas,” said Jessica McCarty, Deputy Earth Science Division Chief at NASA’s Ames Research Center and an Arctic fire specialist. McCarty, the report’s lead author, worked as part of an international team for AMAP.
But it’s not just the number of fires that concerns scientists; it’s how hot they burn.
“It’s the intensity that worries us the most because it has the most profound impact on how ecosystems are changing,” said Tatiana Loboda, chair of the Department of Geographical Sciences at the University of Maryland.
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Arctic ecosystems: How are there fires in the Arctic?
The word ‘Arctic’ often conjures images of glaciers, snow, and a frozen ocean. So how can such a place catch fire?
Officially, the Arctic refers to the region north of 66.5 degrees north, though many Arctic researchers study 60 degrees north and above. While much of the area is covered in snow and ice, the Arctic also boasts a diverse range of ecosystems that change as they extend toward the pole.
It begins with boreal forests, which are primarily made up of coniferous trees like spruce, fir, and pine. As these forests thin to the north, they give way to shrublands, then to grassland tundra, and eventually to rock, ice, and polar bears.
Illustration by Esther Suh, NASA’s Ames Research Center.
Much of the vegetation is covered in snow during the winter, which thaws in the spring. Exposed, the vegetation dries out in the sunlight. When given an ignition source like a lightning strike, it can quickly become fuel for a fire.
What is changing?
According to the 2025 AMAP report, an increasingly flammable landscape combined with more lightning strikes is leading to larger, more frequent, and more intense fires than the landscape is adapted for.
“There is variability year to year, but across the decades we are averaging about double the burned area in the North American Arctic compared to the mid-20th century,” said Brendan Rogers, senior scientist at the Woodwell Climate Research Center.
Low-intensity fires, which the Arctic is accustomed to, leave most of the forest standing, which allows the understory and upper soil layers to recover quickly.
In contrast, intense fires kill off trees and can trigger a process known as secondary succession, in which new species replace those that died. These fires also burn deep into the carbon-rich soil, change the area’s hydrology, and accelerate snowmelt. In addition, the smoke and habitat damage from massive, hot fires pose significant health risks to human communities and local wildlife.
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