An Antarctic ice shelf is singing, and it sounds like an eerie sci-fi soundtrack
The vast Ross Ice Shelf produces tones that vary in response to changing weather conditions.
Study co-author Rick Aster holds a broadband seismometer during a station installation trip on the Ross Ice Shelf. These sensitive sensors were buried at depths of 6 feet to record micro-scale seismic motions of the ice shelf in three dimensions over the course of two years.Courtesy Rick Aster
The discovery of the singing ice came by accident.
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To learn more about the ice shelf, which floats on the Southern Ocean next to the Antarctic continent, researchers in 2014 buried dozens of seismic sensors under the shelf's snowy surface. But when the scientists set about to analyze more than two years of data collected by the sensors, they discovered that the shelf's rough surface — what scientists call the firn layer — was almost constantly vibrating.
The scientists also discovered that the frequency of the vibrations changed in response to changing weather conditions on the shelf — when the temperature rose or fell, for instance, and when storms resculpted the shelf's snow dunes.
Julien Chaput, a geophysicist and mathematician at Colorado State University in Fort Collins and the leader of the research, told NBC News MACH in an email that the sound was "a little like yodeling, except with 10 people all singing in dissonance. It's a little eerie."
But the singing ice is more than a sonic curiosity. Chaput and his colleagues argue in their paper that it might be possible to tap into seismic data to help monitor the health of ice shelves, which have been thinning in response to global warming — and causing sea levels to rise around the world.
Satellite data has proven useful for tracking conditions on ice shelves, but Chaput said seismic monitoring might afford a more nuanced look.
"Our current plans are to data mine all existing Antarctic seismic stations and see if we can get a broad sense of 'snow health' and deploy more stations on vulnerable ice shelves in West Antarctica," he said, adding that the data could prove to be the "canary in the mines" for monitoring polar regions.