Space.com contributing writer Stefanie Waldek is a self-taught space nerd and aviation geek who is passionate about all things spaceflight and astronomy.
The"Maud Rise polynya," a hole in Antarctica's sea ice that in 2016 and 2017 grew to be the size of Switzerland.surrounding the continent expands outward, effectively doubling Antarctica's size. But during the winters of 2016 and 2017, a rare hole called a polynya opened in the middle of the sea ice — one about the size of Switzerland. And scientists have just now figured out how it came to be.
"2017 was the first time that we’ve had such a large and long-lived polynya in the Weddell Sea since the 1970s," study leader Aditya Narayanan, a postdoctoral research fellow at the University of Southampton in England, "This upwelling helps to explain how the sea ice might melt. But as sea ice melts, this leads to a freshening of the surface water, which should in turn put a stop to the mixing," study team member Fabien Roquet, a physical oceanography professor at the University of Gothenburg in Sweden, said in the same statement."So, another process must be happening for the polynya to persist. There must be an additional input of salt from somewhere.
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