These massive calving events are a result of two climate change-related factors — rising air temperature and ocean temperature, she says. (CNN)A story about a glacier shedding mass at the edge of the world, threatening to raise ocean levels and potentially contribute to untold environmental change.

The loss of large ice chunks, known as calving, is a routine process that happens to every glacier. "Its floating ice front, which has an average thickness of approximately 500 meters, has experienced a series of calving events over the past 30 years, some of which have abruptly changed the shape and position of the ice front," the ESA said. He said he hopes the images would continue to be an "eye in the sky" to monitor glacial change and improve public knowledge. “The new paper shows that the Amundsen Sea Embayment ice shelves have gone through most, but not all, of the Jakobshavn steps,” Alley said in an email. Scientists are worried about the future of Pine Island Glacier because its ice is retreating at an accelerated rate, exceeding 35 feet per day, she says. That’s what’s now happening in West Antarctica, the new research argues, suggesting that warm ocean water has thinned the ice shelves out enough from below that they became brittle. ... We have been crying out for instruments like this," Drinkwater said. “The stresses that slow down the glacier, they are no longer in place, so the glacier is speeding up,” said Stef Lhermitte, a satellite expert at Delft University of Technology in the Netherlands who led the new research along with colleagues from NASA and research institutions in France, Belgium, Austria, and the Netherlands. For Pine Island glacier, the new study finds that while the cracking and fraying at the shear margin dates back to 1999, it accelerated in 2016. “So it's much more likely to calve in the future.”. “The speed up increases damage, a positive feedback which is not good news.”. But it has been losing ice over the past 25 years. Cristina Kim produced this story and edited it for broadcast with Todd Mundt.

When the ocean warms, the glacier’s ice shelf starts melting off because 90% of a floating glacier is in the ocean. Two large rifts in PIG were spotted in 2019 and scientists have kept a close eye on the cracks and changes.
Last month, Canada lost its last major Arctic ice shelf. While many of the images have been seen before, the new analysis suggests that they are a sign of further disintegration to come.

The glacier was once buttressed against a tributary ice flow, she says, but after a calving event in 2018, Pine Island “lost contact” with the tributary ice, meaning it now has “less support” and is susceptible to cracks.

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