Business is booming.

Trillions of tons of ice lost in many protective Antarctic shelves

Four dozen Antarctic ice shelves have shrunk by at least 30 per cent since 1997 and 28 of those have lost more than half of their ice in that time, reports a new study that surveyed these crucial “gatekeepers’’ between the frozen continent’s massive glaciers and open ocean.

Of the continent’s 162 ice shelves, 68 show significant shrinking between 1997 and 2021, while 29 grew, 62 didn’t change and three lost mass but not in a way scientists can say shows a significant trend, according to a study in Thursday’s Science Advances.

That melted ice, which usually pens larger glaciers behind it, then goes into the sea. Scientists worry that climate change -triggered melt from Antarctica and Greenland will cause dangerous and significant sea rise over many decades and centuries.

“Knowing exactly how, and how much, ice is being lost from these protective floating shelves is a key step in understanding how Antarctica is evolving,” said University of Colorado ice scientist Ted Scambos, who wasn’t part of the study.

Scambos said the study gives insight into fresh water that’s melting into the Amundsen Sea — “the key region of Antarctica for sea level rise” — that not only adds height to the ocean, but makes it less dense and salty.

The biggest culprits were giant icebergs breaking off in 1999, 2000 and 2002 that were the size of Delaware, he said. The study also looks at ice melting from warm water below.

Ice shelves are floating extensions of glaciers that act “like the gatekeepers” and keep the larger glacier from flowing more quickly into the water, the study’s lead author said.

All told, Antarctic ice shelves lost about 8.3 trillion tons (7.5 trillion metric tons) of ice in the 25-year period, the study found. That amounts to around 330 billion tons (300 billion metric tons) a year and is similar to previous studies.

Quality journalism costs money. Today, we’re asking that you support us to do more. Support our work by sending in your donations.

The donation can be made directly into NatureNews Account below

Guaranty Trust Bank, Nigeria


NatureNews Online

This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More

Footer Image