Study: Warming permafrost puts Arctic pipelines, roads at ‘high risk’
The warming of the Arctic’s frozen grounds has already inflicted a range of calamities on its hardy residents: paved roads that look like ribbons fluttering in a breeze; concrete buildings warped into a cockeyed latticework of cracks. Broken pipelines. Landslides. Suddensinkholes. Drained lakes.
In coming decades, the shifting terrain that accompanies the warming of the permafrost caused by climate change will put more of the man-made structures at risk. Nearly 70% of the infrastructurein the permafrost areas of the Northern Hemisphere — including at least 120,000 buildings and nearly 25,000 miles of roads — are in areas withhigh potential for thaw of near-surface permafrost by 2050, according to new research in the journal Nature Reviews Earth & Environment.
Scientists reached this and several stark conclusions in a series of six papers that the journal published Tuesday focusingon the fate of the warming permafrost, the continuously frozen grounds that are, as one of the papers described it, “the foundation of the Arctic tundra ecosystems.” The papers were reviews and synthesesof research by groups of scientists in several countries aroundthe polar region.
Atmospheric temperatures in parts of the Arctic have risen by as much as 4 degrees Celsius over preindustrial times, according to an analysis by The Washington Post. That rise — more than triple the global average — stems largely from humansburning fossil fuels.
“Permafrost is basically a reflectionof everything that’s
happening on top of it,” said Dmitry Streletskiy, an associate professor of geography at George Washington University and one of the authors of the paper on the impacts of changing permafrost
on infrastructure. “If you have warmer climates, permafrost will reflect that.”
Another paper reported that underground temperatures in colder permafrost areas — places such as the highaltitude Arctic that have temperatures less than minus-2 degreesCelsius —were warming at faster rates, up to about 1degree Celsius per decade. In comparison, it took the planet more than a century to warm 1degree Celsius.
“Simulations unanimously indicate that warming and thawing of permafrost will continue in response to climate change and potentially accelerate,” the study said, noting that there was substantial variation in the amount and timing of the predicted changes based on variousclimate scenarios.
Permafrost covers about 5 million to 7 million square miles in the Arctic and stores about “1,700 billion metric tons” (nearly 1.9 trillion U.S. short tons) of frozen and thawing carbon, one of the studies noted. As it warms and becomes more unstable, it not only threatens the humanmade structures, but also the melting releases carbon into the atmosphere that has been locked in ice for millennia, further exacerbating climate change.
Merritt Turetsky, one of the authors of a paper about carbon emissions in the Arctic,
said it has long been known that permafrost was going to thaw in response to globalwarming.
“What’s kind of shocking, or what is becoming more clear to us as we amalgamate and synthesize more data, is there are some regions that are changing much more quickly than that global average,” said Ms. Turetsky, director of the Institute of Arctic and Alpine Research at the University of Colorado at Boulder. “And these areas alsostore the most carbon.”
Ms. Turetsky cited places such as the Peel Plateau in northwestern Canada or aroundYakutsk, a city in eastern Siberia, as examples. What are known as yedoma soils — permafrost rich in carbon and ice — can be “very vulnerableto collapse.”
“Roads, pipelines, houses buckle,” she said. “People can’ttravel across the land the way that they have for generations past, because the land becomes much more unstable.”
Mr. Streletskiy said the impact on infrastructure is particularly serious in Russia, which has more cities and towns situated on permafrost than other countries. His and his colleagues’ paper noted that nearly 90% of the population in Arctic permafrost areas is located in Russia. In one city cited in the paper, Vorkuta, an estimated 80% of buildings had some deformations because of the changingpermafrost.
“It starts with microcracks, and then those cracks grow, and then some parts of the building start to subside faster than others,” Mr. Streletskiy said. “At this point, you can think about, ‘OK, should I do something to refreeze it back? Should I do something to adapt? ... Or do I need to abandon the building andmove somewhere else?’ ”
Melting permafrost caused a major oil spill in 2020 in the Russian city of Norilsk, when a fuel tank ruptured and leaked tens of thousands of tonsof diesel fuel into a river.
In the United States, Alaskans
have long faced challenges posed by warming permafrost. Thawing of permafrost leads to increased coastal erosion, and some coastal residents in Alaska have been forced to relocate as land has washed away. Severalof those communities are “imminently threatened,” said Rick Thoman, a climate specialist at the International Arctic Research Center at the University of Alaskaat Fairbanks.
“They are one storm away, when everything goes wrong, or all the ingredients come together, those places could be uninhabitable,” said Mr. Thoman, who was not involved with the journal articles.
While technology exists to siphon heat away from buildings,roads and pipelines to try to keep the ground cold, it can be very expensive to apply it on a large scale. Mr. Thoman noted that more than half of Alaskan communities and nearly 80% of state-maintained roads are on ground that has permafrost either continuously or in patches. Even mundane fixes like road repairs get costly when repeatedyear after year.
“You’re spending a lot of money just to stand still,” Mr. Thoman said. “Through the course of the 21st century, this is going to be a very expensive problem for Alaska andall of the Arctic.”
Unlike glaciers or icebergs, permafrost can be hard to measure because it’s underground. To study warming, scientists bore holes into the ground to depths of about 65 to 100 feet and insert sensors that can monitor temperatures at different depths. In Canada, where Sharon Smith works as a permafrost research scientist with the government’s Geological Survey of Canada, there are more than 100 of these underground monitoring sites taking temperature readings,she said.
“Everywhere we do see some kind of warming,” Ms. Smith said. “It may be very slow;it may be much greater.”