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The study, published in the journal Nature Climate Change on Monday, found no matter the degree of warming this century, the melting of the West Antarctic Ice Sheet will speed up as warmer water in the Amundsen Sea erodes ice shelves bordering the ocean. These ice shelves buttress ice further inland, acting as a cork in a bottle that stops their flow into the ocean. The collapse of the West Antarctic Ice Sheet is one of nine global climate 'tipping points' scientists identified in 2009. If the ice sheet were to fully melt, average global sea levels would rise by more than a metre. Antarctic Sea ice saw its lowest maximum extent on record this winter.

Persons: Lauren Dauphin, Kaitlin Naughten, Tiago Segabinazzi Dotto, Gloria Dickie, Ros Russell Organizations: NASA, REUTERS, British Antarctic Survey, West, National Oceanography, Thomson Locations: Antarctica, Handout, Amundsen, London

☆ Climate change: Rapid melting of West Antarctica ice now 'unavoidable,' study finds
▼ + stars: | 2023-10-23 | by ( Rachel Ramirez | ) edition.cnn.com time to read: +5 min

CNN —Rapid melting of West Antarctica’s ice shelves may now be unavoidable as human-caused global warming accelerates, with potentially devastating implications for sea level rise around the world, new research has found. Even if the world meets ambitious targets to limit global heating, West Antarctica will experience substantial ocean warming and ice shelf melting, according to the new study published Monday in the journal Nature Climate Change. They act like buttresses, helping hold ice back on the land, slowing its flow into the sea and providing an important defense against sea level rise. While there has been growing evidence ice loss in West Antarctica may be irreversible, there has been uncertainty about how much can be prevented through climate policies. “The thing that’s depressing is the committed nature of sea level rise, particularly for the next century,” Scambos told CNN.

Persons: ”, Kaitlin Naughten, Naughten, ” Naughten, Ted Scambos, ” Scambos, Scambos, Tiago Segabinazzi Dotto, I’ve Organizations: CNN, British Antarctic Survey, University of Colorado Boulder, “, National Oceanography, Science Media Center Locations: West Antarctica, Antarctica

No matter how much the world cuts back on carbon emissions, a key and sizable chunk of Antarctica is essentially doomed to an “unavoidable” melt, a new study found. Researchers used computer simulations to calculate future melting of protective ice shelves jutting over Antarctica’s Amundsen Sea in western Antarctica. How much melting can still be prevented by reducing emissions?” said study lead author Kaitlin Naughten, an oceanographer at the British Antarctic Survey. In each case, ocean warming was just too much for this section of the ice sheet to survive, the study found. That part of Antarctica “is doomed,” said University of California Irvine ice scientist Eric Rignot, who wasn’t part of the study.

Persons: ”, Kaitlin Naughten, it’s, Naughten, Eric Rignot, Ted Scambos, ” Naughten, Moon, Kate Marvel, ” ___ Read, Seth Borenstein Organizations: West, British Antarctic Survey, University of California, ” University of Colorado, Associated Press, Data, Twitter, AP Locations: Amundsen, Antarctica, ” West Antarctica, University of California Irvine

☆ Oceans temperatures soared to the highest level on record this week
▼ + stars: | 2023-08-04 | by ( Laura Paddison | ) edition.cnn.com time to read: +3 min

But what’s clear, she said, is “that current sea surface temperatures are exceptionally and unseasonably warm” and bringing wide-ranging implications, “especially for complex ecosystems such as coral reefs.”Gregory C. Johnson, an oceanographer at NOAA, said sea surface temperatures have soared this year. Surface temperatures tend to remain high from August through to September before starting to decline, said Johnson. “There’s still room to have warmer sea surface temperatures” this year. In the Florida Keys, a marine heat wave has pushed ocean temperatures to record-breaking, “hot tub” levels, leaving multiple coral reefs now completely bleached or dead. Some scientists are concerned that the ocean temperature records set this year could mark the start of an alarming trend for ocean heat.

Persons: El Niño, Kaitlin Naughten, Copernicus, ”, Gregory C, Johnson, “ There’s, –, Samantha Burgess, “ We’ve, ” Johnson Organizations: CNN, Antarctic Survey, Oceanic, NOAA, North Atlantic, Ireland Locations: Florida, North, North Atlantic

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