Â鶹´«Ã½

Skip to main content

Ice shelf collapses in previously stable East Antarctica

Share

An ice shelf the size of New York City has collapsed in East Antarctica, an area long thought to be stable and not hit much by climate change, concerned scientists said Friday.

The collapse, captured by satellite images, marked the first time in human history that the frigid region had an ice shelf collapse. It happened at the beginning of a freakish warm spell last week when temperatures soared more than 40 C warmer than normal in some spots of East Antarctica. Satellite photos show the area had been shrinking rapidly the last couple of years, and now scientists say they wonder if they have been overestimating East Antarctica's stability and resistance to global warming that has been melting ice rapidly on the smaller western side and the vulnerable peninsula.

The ice shelf, about 1200 square kilometres wide and holding in the Conger and Glenzer glaciers from the warmer water, collapsed between March 14 and 16, said ice scientist Catherine Walker of the Woods Hole Oceanographic Institute. She said scientists have never seen this happen in this part of the continent and that makes it worrisome.

"The Glenzer Conger ice shelf presumably had been there for thousands of years and it's not ever going to be there again," said University of Minnesota ice scientist Peter Neff.

The issue isn't the amount of ice lost in this collapse, Neff and Walker said. It's negligible. But it's more about the where it happened.

Neff said he worries that previous assumptions about East Antarctica's stability may not be so right. And that's important because the water frozen in East Antarctica if it melted -- and that's a millennia-long process if not longer -- would raise seas across the globe more than 50 metres. It's more than five times the ice in the more vulnerable West Antarctic Ice Sheet, where scientists have concentrated much of their research.

Scientists had been seeing the ice shelf shrink a bit since the 1970s, Neff said. Then in 2020, the shelf's ice loss sped up to losing about half of itself every month or so, Walker said.

"We probably are seeing the result of a lot of long time increased ocean warming there," Walker said. "it's just been melting and melting."

And then last week's warming "probably is something like, you know, the last straw on the camel's back."

CTVNews.ca Top Stories

A Nova Scotian YouTuber has launched a mini-truck bookmobile.

Infectious disease physician Dr. Isaac Bogoch says whooping cough is most risky for unvaccinated infants, children and older people.

Local Spotlight

Cole Haas is more than just an avid fan of the F.W. Johnson Wildcats football team. He's a fixture on the sidelines, a source of encouragement, and a beloved member of the team.

Getting a photograph of a rainbow? Common. Getting a photo of a lightning strike? Rare. Getting a photo of both at the same time? Extremely rare, but it happened to a Manitoba photographer this week.

An anonymous business owner paid off the mortgage for a New Brunswick not-for-profit.

They say a dog is a man’s best friend. In the case of Darren Cropper, from Bonfield, Ont., his three-year-old Siberian husky and golden retriever mix named Bear literally saved his life.

A growing group of brides and wedding photographers from across the province say they have been taken for tens of thousands of dollars by a Barrie, Ont. wedding photographer.

Paleontologists from the Royal B.C. Museum have uncovered "a trove of extraordinary fossils" high in the mountains of northern B.C., the museum announced Thursday.

The search for a missing ancient 28-year-old chocolate donkey ended with a tragic discovery Wednesday.

The Royal Canadian Mounted Police is celebrating an important milestone in the organization's history: 50 years since the first women joined the force.

It's been a whirlwind of joyful events for a northern Ontario couple who just welcomed a baby into their family and won the $70 million Lotto Max jackpot last month.