Climate change did not unleash a giant Antarctic iceberg, scientists say

Climate change did not unleash a giant Antarctic iceberg, scientists say

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There is a new iceberg off the coast of Antarctica. The as-yet-unnamed 600-square-mile iceberg broke off from the nearly 500-foot-thick Brunt Ice Shelf on Sunday during a particularly high tide known as a spring tide, according to news release issued by the British Antarctic Institute (BAS).

The calving event is “part of the natural behavior of the Brunt Ice Shelf” and “is not linked to climate change,” BAS glaciologist Dominic Hodgson said in the news release.

Drone video taken Jan. 22 shows a massive crack where a 598-square-foot iceberg has broken off from Antarctica’s Brunt Ice Shelf. (Video: British Antarctic Survey via Storyful)

Satellite images captured the breach, which occurred about 10 years after satellite surveillance detected growth in a previously dormant crack in the ice known as Chasm-1, and nearly two years after a slightly smaller iceberg called A74 separated from the same ice shelf. A chasm is a crack in an ice shelf that extends all the way from the surface to the ocean below, while an ice shelf is a floating piece of ice that extends from glaciers formed on land.

Ted Scambos, a senior research fellow at the University of Colorado at Boulder, wrote in an email that while the iceberg “is a huge mass of ice, about 500 billion tons … it is far from the largest iceberg ever seen, rivaling Long Island.

The calving event is not expected to affect BAS’s Halley research station, which was moved further inland in 2016 as a precaution after Chasm-1 began growing.

“However, the new fracture puts the base about 10 miles from the ocean, and in the next few years a new crack may develop, necessitating another costly relocation of the station,” Scambos wrote. The new iceberg is expected to follow a similar path to that of the A74 in the Weddell Sea and will be named by the US National Ice Centre.

Unlike some previous icebergs and collapsed ice shelves that were related to climate changethe BAS press release said the outage was a “natural process” and “there is no evidence that climate change has played a significant role.”

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Rather, the gap began to grow due to “the accumulation of stress … due to the natural growth of the ice shelf,” said Hilmar Gudmundsson, a glaciology researcher at Northumbria University, in BBC Story 2019.

Scambos compares calving an iceberg to a chisel on a wooden board. “In this case, the chisel was a small island called the ‘MacDonald Ice Rise,'” Scambos wrote. “The ice was pressed against this rocky seamount by an ice flow, forcing it to split and eventually break away from the floating ice shelf.”

‚ÄúThese large iceberg formations, sometimes as big as a small country, are impressive. But they are only part of the way the Antarctic ice sheet works,” Scambos said. “Most of the time, they have nothing to do with climate change.”

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