Previously thought to protect ice shelves, new research hints that meltwater rivers could instead cause their collapse. Click the link to read more.
"If meltwater is draining through a channelized network, then maybe it’s not spilling into a crevasse and pushing it open or forming ponds," says Boghosian.Boghosian’s most recent findings, though, cast doubt on this optimism. While the Nansen Ice Shelf’s surface rivers could have made the ice shelf more stable today, they could also have evolved to undermine its structure.
"At some point the river had incised down to sea level," says Boghosian. "That’s the first time we could see that it’s probably flowing backwards." The implications of this transformation are still unknown, but Boghosian observed some worrying signs. Most fractures in ice shelves run parallel to the calving front, where the ice meets the ocean. But the estuary seemed to. Boghosian saw evidence in historical photos that these fractures had caused large chunks of ice to break away in the past.
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