Antarctica Lost an Ice Shelf, but Gained an Island By Nancy_A
Gibson thinks the feature is likely an ice island: a large, heavy cap of ice sitting solidly on an underwater peak.
Gibson called the ice island “self-perpetuating,” meaning that snow and ice accumulating on the island’s surface balances out the amount of melting that occurs underwater. If that balance becomes disrupted by a decrease in snowfall, then the ice island could thin and float away. “The unnamed island is a more-or-less permanent feature of the landscape,” Gibson said, “but may someday detach from the underlying rock and become an iceberg.
NASA says that elevation data in December 2021 from the Advanced Topographic Laser Altimeter System on NASA’s Ice, Cloud, and land Elevation Satellite 2 shows at least part of the island stands 30 to 35 meters above the surface of the sea. NASA says that most of the Glenzer and Conger ice shelves are gone, having collapsed earlier this year. And with further collapse of Antarctic ice shelves due to the warming ocean, more of these islands might be popping up.
“The discovery of more of them is likely to continue in the years ahead due to shrinking glacial and sea ice,” said Christopher Shuman, a University of Maryland, Baltimore County, glaciologist based at NASA’s Goddard Space Flight Center. “Obviously these are ‘new to us’ features, but we also have more people and more tools to look at the margins of Antarctica now.
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