Permafrost, which lies beneath about 15% of the land in the Northern Hemisphere, is defined as ground that has remained frozen for at least two years. Historically, much of the world’s permafrost has remained solid and stable for far longer, allowing people to build whole towns atop it. But as the planet warms, a process that is happening more rapidly near the poles than at more temperate latitudes, permafrost is thawing and causing a host of infrastructural and environmental problems.
Now scientists think they may be able to use satellite data to delve deep beneath the ground’s surface and get a better understanding of how the permafrost thaws, and which areas might be most severely affected because they had more ice to start with. Clues from the short-term behavior of those especially icy areas, seen from space, could portend future problems.
Using information gathered both from space and on the ground, they are working with affected communities to anticipate whether a house’s foundation will crack—and whether it is worth mending that crack or is better to start over in a new house on a stable hilltop. These scientists’ permafrost predictions are already helping communities like Nunapitchuk make those tough calls.
But it’s not just civilian homes that are at risk. One of the top US intelligence agencies, the National Geospatial-Intelligence Agency (NGA), is also interested in understanding permafrost better. That’s because the same problems that plague civilians in the high north also plague military infrastructure, at home and abroad. The NGA is, essentially, an organization full of space spies—people who analyze data from surveillance satellites and make sense of it for the country’s national security apparatus.
Understanding the potential instabilities of the Alaskan military infrastructure—which includes radar stations that watch for intercontinental ballistic missiles, as well as military bases and National Guard posts—is key to keeping those facilities in good working order and planning for their strengthened future. Understanding the potential permafrost weaknesses that could affect the infrastructure of countries like Russia and China, meanwhile, affords what insiders might call “situational awareness” about competitors.
The work to understand this thawing will only become more relevant, for civilians and their governments alike, as the world continues to warm.
The ground beneath
If you live much below the Arctic Circle, you probably don’t think a lot about permafrost. But it affects you no matter where you call home.
In addition to the infrastructural consequences for real towns like Nunapitchuk, thawing permafrost contains sequestered carbon—twice as much as currently inhabits the atmosphere. As the permafrost thaws, the process can release greenhouse gases into the atmosphere. That release can cause a feedback loop: Warmer temperatures thaw permafrost, which releases greenhouse gases, which warms the air more, which then—you get it.