greenland ice sheet
How much Greenland melts going forward is up to us. Deep ice cores from the Greenland Ice Sheet were obtained for comparison with deep cores from the Antarctic ice mass to gain a better understanding of the factors controlling present and past ice mass dynamics, atmospheric processes, and the response of ice sheets to climatic change and to determine whether the past changes in climate were global or regional in character. The melting today on Greenland's ice sheet is roughly equal to the greatest rates of ice loss in the last 12,000 years, a new study shows. It extends 1,570 miles (2,530 km) north-south, has a maximum width of 680 miles (1,094 km) near its northern margin, and has an average thickness of about 5,000 feet (1,500 m). "We've passed the point of no return but there's obviously more to come," Howat said. Ice melting in Greenland contributes more than a millimeter rise to sea level every year, and that's likely to get worse. It contains enough ice to raise sea levels by 23 feet (7 meters). The big difference between now and then? (CNN)We've known for some time now that Greenland's ice sheet is melting at an alarming rate. A chart provided by the study authors shows how rapidly Greenland's melt has accelerated, and how unprecedented it is compared to rates that occurred over the last 12,000 years. Coastal states like Florida, and low-lying island nations are particularly vulnerable. What happens to Greenland's ice sheet and others around the globe will determine what the future holds for the millions of people living along the world's coasts. "The ice sheet is now in this new dynamic state, where even if we went back to a climate that was more like what we had 20 or 30 years ago, we would still be pretty quickly losing mass," Ian Howat, co-author of the study and a professor at Ohio State University, said. The study used four decades of satellite data to measure changes in Greenland's ice sheet. Greenland Ice Sheet, also called Inland Ice, Danish Indlandsis, single ice cap or glacier covering about 80 percent of the island of Greenland and the largest ice mass in the Northern Hemisphere, second only in size to the Antarctic ice mass. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Mountain peaks (nunataks) projecting through the ice cap on northern Ellesmere Island, Nunavut, Can. "Humanity has the knobs, and we can turn those knobs to decide what the ice sheet is going to do," he said. The glaciers of the north polar regions can be divided into two groups depending on the source of their snow. Greenland's ice sheet -- which contains enough water to raise global sea levels by 24 feet -- is melting as fast as at any time in the last 12,000 years, a new study finds. In the 1970s and early ’80s the Greenland Ice Sheet Program was organized by scientists from the United States, Denmark, and Switzerland. (CNN)Greenland's ice sheet has melted to a point of no return, and efforts to slow global warming will not stop it from disintegrating. Meltwater carves into the ice sheet near the Sermeq Avangnardleq glacier in Greenland in August 2019. Greenland's ice sheet may have passed a point of no return, setting it on an irreversible path to disappearance, according to researchers at Ohio State University. If climate change continues at this rate, the rate of melting will get much worse. The ice mass, covering an area of 708,100 square miles (1,833,900 square km), is contained by coastal mountains on the east and west. "These results say that human decisions about our energy systems are truly important in deciding how much sea level rise we face from melting of Greenland's ice. The ice that melts or breaks off from Greenland's ice sheets ends up in the Atlantic Ocean—and, eventually, all of the world's oceans. Ice from Greenland is … The movement of the ice sheet is principally outward from the crest of the ice divide. That's according to a new study by researchers at Ohio State University. Updated 2209 GMT (0609 HKT) August 14, 2020. Greenland Ice Sheet, also called Inland Ice, Danish Indlandsis, single ice cap or glacier covering about 80 percent of the island of Greenland and the largest ice mass in the Northern Hemisphere, second only in size to the Antarctic ice mass. The ice loss has been so massive in recent years, she said, that it has caused a measurable change in the gravitational field over Greenland. "We know there's a lot of year-to-year variability, so what we were interested in doing is capturing the more meaningful trends over decades and maybe up to a century," said Jason Briner, a professor of geology at the University at Buffalo and the lead author of the study. The margin of the ice sheet reaches the sea in the area of Melville Bay southeast of Thule in the form of large outlet glaciers that calve off into the ocean, producing numerous icebergs. Our editors will review what you’ve submitted and determine whether to revise the article. The larger group is around the North Atlantic and its marginal seas; the smaller is nourished by moisture from the North Pacific…. Greenland's ice sheet dumps more than 280 billion metric tons of melting ice into the ocean each year, making it the greatest single contributor to global sea level rise, according to Michalea King, the lead author of the study and researcher at Ohio State University. Over the last two decades, Greenland's ice sheet has melted at a rate of roughly 6,100 billion tons per century, a rate approached only during a warm period that occurred between 7,000 and 10,000 years ago. "And when you do that, and think about the direction that Greenland is heading this century, it's pretty clear we're in quite anomalous times.". Omissions? Let us know if you have suggestions to improve this article (requires login). The authors found that after 2000, the ice sheet shrank so rapidly that replenishing snowfall would not keep up with the rate of melting from parts of the glacier newly exposed to warmer ocean water, even if climate change were reversed. It is separated from the southern dome (8,200 feet [2,500 m] in elevation) by a depression with a maximum elevation of 7,900 feet (2,400 m) that runs from the Disko Bay area in the west to the Angmagssalik area in the southeast. "Rather than being a single tipping point in which we've gone from a happy ice sheet to a rapidly collapsing ice sheet, it's more of a staircase where we've fallen off the first step but there's many more steps to go down into the pit. Just 3 feet of sea level rise could put large areas of coastline underwater. The ice sheet occupies a saucerlike basin that has a bedrock surface near sea level under most of Greenland. Updated 1915 GMT (0315 HKT) September 30, 2020. Forty percent of the US population resides in coastal areas that are vulnerable to sea level rise. "There's a lot of places, like in Florida especially, where one meter alone would cover a lot of existing land areas," King said. In terms of its potential to raise sea levels, Greenland is the world's second most important ice sheet, behind only Antarctica. The ice cap is the largest and possibly the only relict of the Pleistocene glaciations in the Northern Hemisphere. Whether the rapid disintegration we're seeing on Greenland today compares to anything that has happened in the past is a question on which the science is not completely clear. The Greenland ice sheet is about the same size as the state of Alaska and 10,000 feet thick in places.
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