Scientists have been left baffled after a massive hole the size of the state of Maine opened up in Antarctica.
The mysterious hole has been described as “quite remarkable” by atmospheric physicist Kent Moore, a professor at the University of Toronto, who says “It looks like you just punched a hole in the ice.”
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Motherboard reports: Areas of open water surrounded by sea ice, such as this one, are known as polynias. They form in coastal regions of Antarctica, Moore told me. What’s strange here, though, is that this polynia is “deep in the ice pack,” he said, and must have formed through other processes that aren’t understood.
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“This is hundreds of kilometres from the ice edge. If we didn’t have a satellite, we wouldn’t know it was there.” (It measured 80,000 k㎡ at its peak.)
A polynia was observed in the same location, in Antarctica’s Weddell Sea, in the 1970s, according to Moore, who’s been working with the Southern Ocean Carbon and Climate Observations and Modelling (SOCCOM) group, based at Princeton University, to analyze what’s going on. Back then, scientists’ observation tools weren’t nearly as good, so that hole remained largely unstudied. Then it went away for four decades, until last year, when it reopened for a few weeks. Now it’s back again.
“This is now the second year in a row it’s opened after 40 years of not being there,” Moore said. (It opened around September 9.) “We’re still trying to figure out what’s going on.”
It’s tempting to blame this strange hole on climate change, which is reshaping so much of the world, including Antarctica. But Moore said that’s “premature.” Scientists can say with certainty, though, that the polynia will have a wider impact on the oceans.
“Once the sea ice melts back, you have this huge temperature contrast between the ocean and the atmosphere,” Moore explained. “It can start driving convection.” Denser, colder water sinks to the bottom of the ocean, while warmer water comes to the surface, “which can keep the polynia open once it starts,” he said.
Using observations from satellites and deep sea robots, Moore and his collaborators are working on as-yet-unpublished research that aims to answer some of these questions. “Compared to 40 years ago, the amount of data we have is amazing,” he said.
Antarctica is undergoing massive changes right now, and figuring out why a gaping hole could suddenly open up will be key to understanding larger systems at play.
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