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Dec 082020
 

The Antarctic ice shelf continues to crack. Some ice shelves float on open water and do not slow glaciers' slide into the sea, because there's no land mass for them to brace against. Now, it’s extending outward in fits and starts, growing by a few hundred meters each week, on average. An enormous crack, the size of a football field, has formed in an Antarctic ice shelf! (See exclusive photos of another giant iceberg breaking away from Antarctica). “The Brunt ice shelf is relatively far south compared to the ice shelves that have calved dramatically on the Antarctic Peninsula,” says Oliver Marsh, a glaciologist at the British Antarctic Survey in Cambridge, England, and the extra-warm air temperatures that have toasted that region haven’t had such a dramatic effect at Brunt yet. Live Science is part of Future US Inc, an international media group and leading digital publisher. Unlike the dramatic ice break-ups observed over the past few years on the Antarctic peninsula, though, this calving event is not likely driven by warming air or seas. A rapidly advancing crack in Antarctica’s fourth-largest ice shelf has scientists concerned that it is getting close to a full break. But no one knows exactly when the berg will dislodge. A close-up image of a crack spreading across the ice shelf of Pine Island Glacier on October 26, 2011 shows the details of the boulder-like blocks of ice that fell into the rift when it … It offers an economically sound means to slow the rate of temperature increase down NOW not when it's too late! A chunk of ice more than twice the size of New York City could break off from Antarctica’s Brunt Ice shelf essentially at any moment. That ridge pins the ice … The crack was first reported in December, and according to British researchers, only 12 miles of ice now connects this ice shelf to the mainland. Info. Shopping. The buttressing shelves accumulate cracks on their surfaces as glaciers push against them from behind, and cracks also appear as the shelf pushes against the curvature of the shoreline. From ~1880 to ~1940. “This calving event is just part of a natural cycle.”. Read my paper under climate change in live science. The climate has warmed in the past. Image. 2020 National Geographic Partners, LLC. Antarctic ice shelves can disappear astonishingly fast — sometimes in minutes or hours — as meltwater surges through cracks in their surface. A large section of the Larsen C shelf broke away in … Antarctica: Cracks in the ice by Delft University of Technology Enormous curved crevasses near the Pine Island Glacier shear margin. Troubling Crack in Antarctic Ice Shelf November 29, 2016 Scientists say a giant crack deep beneath the ice in Antarctica is evidence large parts of the West Antarctic ice … When they do, a monster berg will begin its slow float away from the continent. To determine which buttressing ice shelves are vulnerable to collapse, Lai and her colleagues developed a machine learning model — an algorithm that can be trained to recognize visual features based on past images it has analyzed. https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2004GL022024, https://climate.nasa.gov/news/2852/cold-water-currently-slowing-fastest-greenland-glacier/, https://sealevel.info/1612340_Honolulu_vs_CO2_thru_2020-03_annot1.png, 5 ways climate change will affect your health, In photos: The vanishing glaciers of Europe's Alps, These photos of the Arecibo Observatory telescope collapse are just heartbreaking, Black holes may not exist, but fuzzballs might, wild theory suggests, Sprawling 8-mile-long 'canvas' of ice age beasts discovered hidden in Amazon rainforest, Biblical Goliath may not have been a giant, Chinese submarine reaches the deepest place on Earth, Scientists just mapped 1 million new galaxies, in 300 hours, Mystery Settlers Reached 'Step to Americas' Before Vikings. Please refresh the page and try again. We have desploiled a wonderland with our greed and ignorance. But this hunk is nothing to sneeze at. When it inevitably intersects with the nearby Halloween Crack, an iceberg the size of Houston, Texas will break off into the ocean. The new study, published today (Aug. 26) in the journal Nature, suggests that about 50% to 70% of ice shelves that hold Antarctic glaciers in place could become weak and potentially collapse with surges of meltwater. To find out, the team will need to pair their model of ice cracks with climate predictions and a model of how ice flows over the bedrock of Antarctica; this ice flows downslope into the ocean "just like rivers flowing downhill," she said. For context, that area of ice is larger than the state of Rhode Island. Basal melting could make ice shelves more prone to hydrofracture, as the shelves become thin and stretch more easily the more they melt, Lai added. A response to Chem721. Tbe temperature on Earth has consistently but slowly varied from one extreme to the other about every 40,000 years and nature (living things) has accommodated the change by moving in the case of herbivores alternately between the equator and the arctic circle. New satellite images show an enormous crack or rift in the Larsen C ice shelf has suddenly forked and accelerated toward the Southern Ocean. That prize goes to a Delaware-sized chunk (something like 2,240 square miles) that peeled off the nearby Larsen-C ice sheet in 2017. When the ice melts does the water in the glass rise, does it over flow. "It would be interesting to see which ice shelves are most vulnerable due to all three processes," meaning basal melt, surface melt and hydrofracture, combined. The second break point, near the top of the image and first observed in 2016, is known as the Halloween crack. When this crack eventually spreads across the entire ice A crack started spreading across the Larsen C ice shelf in 2010, reaching 100 miles in length in February. All rights reserved. 8. With their map of ice cracks in hand, the researchers then determined which fractures in Antarctica's many ice shelves would be prone to hydrofracture, given the pressures exerted on them from surrounding land masses and their movement over the water. Massive crack might cause Antarctic ice shelf to break off; Greenland’s ice melting - Compilation - YouTube. The seventh largest Antarctic ice shelf is located on the coast of East Antarctica and extends as part of the Mawson Sea. Massive crack in Antarctica ice shelf grows 11 miles in only 6 days. Though the researchers don't have a time frame yet, some scientists predict that climate change may drive massive hydrofracturing events within a matter of decades, according to a 2015 report in the journal Earth and Planetary Science Letters. Share. Lai and her colleagues focused on these so-called buttressing ice shelves. See the crack splitting an Antarctic ice shelf in two Stunning drone footage captures Chasm 1, a huge crack on the Brunt Ice Shelf. It’s no surprise that the giant berg would eventually break off: The Brunt Ice Shelf is one of the most carefully monitored ice tongues in the world, because it’s the site of the Halley Research Station, a major center for the British Antarctic Survey’s research activities in the region. Thank you for signing up to Live Science. Stay up to date on the coronavirus outbreak by signing up to our newsletter today. The first fault line on the Brunt Ice Shelf, called Chasm 1, has been in place for over 35 years (glaciologists call breaks in the ice sheet that extend all the way from surface to the ocean below “chasms,” while shallower faults are called “cracks” or “crevasses”). The Milne ice shelf was on of the Arctic's few remaining intact ice shelves, but at the end of July 2020 about 43% broke off. The vast majority of ice shelves are losing volume due to rising ocean and air temperatures. Future US, Inc. 11 West 42nd Street, 15th Floor, There was a problem. © In addition, the ice shelves stretch out as they flow across the ocean water, due to their velocity, Lai told Live Science. That ridge pins the ice in place and slows its flow, forcing ice upstream to pile up, fold, crinkle, and sometimes crack. Displacement, it stays the same. Researchers have used this analysis at specific ice shelves before, but "this is the first time it has been applied to the Antarctic as a whole," Dow noted. Photograph by Stuart Holroyd, Alamy Stock Photo, This giant chunk of ice could break off Antarctica any day, https://www.nationalgeographic.com/environment/2019/03/huge-chunk-brunt-ice-break-off-antarctica.html, that peeled off the nearby Larsen-C ice sheet in 2017, See exclusive photos of another giant iceberg breaking away from Antarctica. Antarctic ice shelf crack is 'very close' to calving off and creating one of the biggest icebergs ever recorded. A large rift is widening across an increasingly fragile Antarctic ice shelf, scientists found. The end of Chasm 1 is currently about 2.5 miles away from the ice rumples. Give me something tangible to believe in on man made climate change, other than we need a tax administered by the UN who backs this climate change hocus pocus. By The crack is upstream from a set of crinkles, visible from the satellite photos, called the McDonald Ice Rumples. And as the atmosphere warms, this phenomenon may become more commonplace; at least half of the ice shelves on the continent are vulnerable to this process, a new study suggests. Visit our corporate site. "Usually near the front of ice shelves, it gets stretched the fastest and this kind of breaking occurs," she said. The research highlights which ice shelves are most likely to crumble, but not when this dissolution is most likely to occur. The point is that the 'trivial' amount of warning you refer to is enormous when applied to the oceans. Unless we very quickly wake up and adopt a means of mitigating the chaos and disaster awaiting us, it will be too late. Or is this just a model of what might happen? The ice shelf Sevestre was studying is called Larsen C, and it now has a massive 90-mile crack running through it. If we had't had them we would have fried to death ages ago. Politicians don't help. Lai said. © 1996-2015 National Geographic Society, © 2015- The authors trained their model to recognize surface fractures in the ice using satellite images of two ice shelves, named Larsen C and George VI, in the northwest region of Antarctica, and then applied the model to a complete map of Antarctica. But ice shelves confined to bays and gulfs create a physical barrier that the slow-moving glaciers butt up against. Ice shelves are attached to a large portion of the Antarctic coastline. 7. Copy link. This crack has formed in Larsen C, an ice shelf drifting off the Antarctic Peninsula. Researchers with Project MIDAS , a British group monitoring the ice shelf… Most of the recent climate concern has been about so-called, 90 % of the sea ice shelves breaks off yearly never a boost to sea level. An interesting quote. The ice shelf has an area of 33,820 square km. These floating ice sheets ring Antarctica's glaciers and prevent them from sliding into the ocean. Since December, the crack on the Larsen C ice shelf has grown by the length of about five football fields each day. "Also, Antarctic ice shelves are currently losing most [of their] mass due to basal melting," or melting on the underside of the ice sheet, "in response to warming ocean temperatures," Banwell added. The next big question is "how does this hydrofracture process contribute to the sea level rise?" Think on it put some ice in a glass with some water mark the level. An Antarctic ice shelf that has existed for thousands of years is about to shed a 1,000-foot-thick (300-metre) block of ice that's roughly the size of Delaware. As of now, "estimating time scales on which these ice shelves might break up due to surface melting and hydrofracture is beyond the scope of their study," Alison Banwell, a research scientist at the Cooperative Institute for Research in Environmental Sciences (CIRES) at the University of Colorado Boulder, who was not involved in the study, told Live Science in an email. The Larsen B ice shelf is currently 625 square miles in area and 1,640ft at its thickest point. "What we find is that the amount of melting is important, but where the melting happens is also important," said lead author Ching-Yao Lai, a postdoctoral researcher in the Department of Marine Geology & Geophysics at Columbia University's Lamont-Doherty Earth Observatory in New York. The big difference now is that our use of fossil fuels has accelerated the change so it is happening much faster than we can cope with. Two large cracks in the shelf have been inching further open over the past few years. A massive crack in an Antarctic ice shelf grew by 11 miles in the past six days as one of the world's biggest icebergs ever is poised to break off. Sooner or later, the two cracks are likely to intersect. It remained relatively stable until 2012, when surveyors noticed that it starting to grow again, creeping across the wide tongue of ice that protruded out over the ocean. You will receive a verification email shortly. Scientists say that without a … https://strangesounds.org/2019/08/antarctica-cracks-split-ice-shelf-in-two.html Names are also listed in the Scientific Committee on Antarctic Research, Gazetteer. It has been named after the famous polar explorer, Sir Ernest Shackleton. The new rift in Larsen C emerged days after a Delaware-sized iceberg broke off from the ice shelf. My question was about the polar ice caps, not glaciers. A rift along the Larsen C Ice Shelf grew longer during the Antarctic winter. The ice shelf was first discovered and mapped by USEE in 1840. When warm atmospheric conditions cause the surface of an ice shelf to melt, meltwater can pool in these cracks and cause "hydrofracturing" — a process in which the excess water puts pressure on the ice, deepening the cracks and sometimes triggering a complete collapse of the shelf. The rumples form when the bottom of the ice shelf, which flows downhill toward the ocean like very slow putty, runs up against an underwater ridge. Related: 10 signs that Earth's climate is off the rails. In the future, this type of research will help the authors determine how fast and how much sea level rise could change due to cracking ice sheets, given rising atmospheric temperatures, Lai noted. Antarctic ice shelves can disappear astonishingly fast — sometimes in minutes or hours — as meltwater surges through cracks in their surface. —5 ways climate change will affect your health, —In photos: The vanishing glaciers of Europe's Alps. When the fast-growing crack cuts all the way across the ice shelf, the area of ice lost from the shelf will likely be at least 660 square miles (1,700 square km). After all the global climate has warmed less than one degree C overall. Nor is the berg the biggest to break off Antarctic ice sheets in recent years. Without these icy barriers, glaciers would flow more quickly into the water, causing the continent to shrink and accelerating sea level rise. They have acted like a 'heat sink'. Emperor penguins stand on a patch of sea ice just off the Brunt Ice Shelf in Antarctica. The overall result would eventually be the same—that a berg breaks off—but the timeline for that break-up would change. A crack in an Antarctic ice shelf has grown by 17 miles in the last two months, scientists said. Further south, Larsen D and the much smaller Larsen E, F and G are also named. Climate change deniers frequently use the fact that there have always been these swings, to spread misunderstanding and a sense of impotence. Shackleton Ice Shelf . The breakup of the ice shelf since the mid-1990s has been widely reported, with the collapse of Larsen B in 2002 being particularly dramatic. "The crack in the ice then fills up with ocean water," and the shelf may begin to break apart. Did these Antarctic ice shelves start to collapse back then? 26 August 2020. "The Antarctic Peninsula has been one of the most rapidly warming regions of the world during the twentieth century." Last Call for Larsen B. "The time frame over which this process could happen is the biggest question," Christine Dow, the Canada Research Chair in Glacier Hydrology and Ice Dynamics at the University of Waterloo, who was not involved in the study, told Live Science in an email. New York, The changes don’t just stop with the Larsen C crack or the Antarctic Peninsula in general. Crack Advances Across Antarctic Ice Shelf. Their total area is 1,541,700 km 2. Scientists theorize that this is what happened to an ice shelf known as Larsen B, which lost 1,255 square miles (3,250 square kilometers) of ice over the course of a few weeks in 2002, according to The National Snow and Ice Data Center. Watch later. Related: Photographic proof of climate change: Time-lapse images of retreating glaciers. The back and forth growth and retreat of glaciers is well known. A huge crack in one of Antarctica's largest ice shelves has grown by another 11 miles, leaving an area of ice a quarter of the size of New Jersey hanging on by a section that is only eight miles long. An iceberg that is almost as big as Chicago is about to break away from an Antarctic ice shelf. When they finally intersect, a berg about 660 square miles wide and almost 500 feet thick will be released into the ocean—where it will eventually melt, joining its brethren in adding more water to the world’s oceans and pushing global sea levels a tiny bit higher. Antarctica's expanding ice-free areas threaten animals and plants, study says. The iceberg, which will be around 500 square kilometers (193 … The ice shelf areas are listed below, clockwise, starting in the west of East Antarctica: Alternatively, says Marsh, the stresses on the ice shelf could force Chasm 1 to take a turn toward the ocean. Tap to unmute. Two Antarctic glaciers are breaking up and it could have major consequences for sea level rise - CNN. "The big rift is slicing the ice shelf from top to bottom," Sevestre says. And … The rift in the Larsen C Ice Shelf is now almost 125 miles (200km) long The rumples form when the bottom of the ice shelf, which flows downhill toward the ocean like very slow putty, runs up against an underwater ridge. Published Sep 8, 2016 Image of the Day Snow and Ice Remote Sensing Sea and Lake Ice. The melt water "can punch through the ice to the ocean in a matter of minutes to hours, as long as there's enough water available to keep on filling the crevasse and keep up the pressure," Dow said. Nicoletta Lanese - Staff Writer Please deactivate your ad blocker in order to see our subscription offer. It is important to distinguish between glacial ice and polar ice shelves as Mogoso pointed out. NY 10036. Accelerated toward the ocean C emerged days after a Delaware-sized iceberg broke off from ice... Climate change in live Science is part of Future US, it will be too late Ernest Shackleton part... 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