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Greenland ice sheet loses its last grip

Greenland is losing the battle against rising air and ocean temperatures, a new study finds. The last bulwark to fall is the northeast corner of canada goose outlet store new york the Greenland Ice Sheet, which started shrinking canada goose outlet in chicago rapidly in 2003, according to a canada goose vest outlet new study. canada goose outlet shop «This was very surprising, because we don’t expect huge ice loss in northeast Greenland.»

buy canada goose jacket cheap The northeast Greenland ice sheet lost more than 10 billion tons of ice per year since 2003, according to the study, published March 16 in the journal Nature Climate Change. Once thought immune to global warming’s effects, melting in northeast Greenland could significantly boost Greenland’s contribution sea level rise. For comparison, southwest Greenland’s Jakobshavn glacier has retreated 21.7 miles (35 km) in the past 150 years, the researchers said. Jakobshavn is the fastest flowing glacier on Earth. buy canada goose jacket cheap

Canada Goose Parka «Suddenly we have a new goose outlet canada area which will most likely be faster than Jakobshavn in the future,» Khan told Live Science. Canada Goose Parka

canada goose coats on sale The shocking results have already sparked debate among Greenland experts, canada goose outlet uk because the ice loss estimates for the northeast are much greater than other recent studies. «Nobody else canada goose jacket outlet uk has really seen this big dynamic canada goose outlet in toronto [ice loss] signal they’re seeing,» said Ian Joughin, a glaciologist at the University of Washington’s Polar Science Center, who was not involved in the study. canada goose coats on sale

Canada Goose sale For example, a recent study that estimated ice loss at 178 Greenland glaciers calculated that Zachariae glacier, one of northeast Greenland’s three main glaciers, canada goose outlet toronto address only lost a total of 20 billion tons of ice between 2000 canada goose outlet online uk and 2012. Just four glaciers accounted for half of Greenland’s melting ice since 2000, and none were in the northwest, the study said. canada goose outlet store uk The findings were published Feb. 7 in the journal Geophysical Research Letters. Canada Goose sale

canada goose black friday sale «Overall, I would say that this area is likely to lose mass in the future but that there is not a catastrophic retreat going on,» canada goose outlet online store review Joughin told Live Science. canada goose black friday sale

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One reason why big discrepancies can arise between similar studies is that data is sparse in northeast Greenland. Researchers estimate ice loss canada goose outlet black friday sale with computer models based on ice thickness, glacier valley shape and ice velocity. In canada goose outlet legit the remote northeast, just a few flight lines from research programs such as NASA’s IceBridge canada goose sale uk cross some critical glaciers.

Canada Goose online Khan and his colleagues relied on several data sources such as canada goose outlet belgium satellite data, aerial photos, GPS and airborne radar instruments to track changes canada goose outlet store toronto in northeast Greenland’s ice. Canada Goose online

Satellite images show that the northeast’s three main glaciers Nioghalvfjerdsfjorden glacier, canada goose outlet phone number also called 79 North, the Zachariae glacier and the Storstr glacier all lost ice recently. Previous studies have also noted canada goose jacket outlet toronto Zachariae canada goose outlet london uk glacier has started flowing faster, increasing its speed by a third. Zachariae drains 16 percent of the Greenland ice sheet, an area twice as canada canada goose outlet goose outlet store quebec large as southwest Greenland’s fastest canada goose outlet in usa flowing glacier, the Jakobshavn ice stream.

cheap Canada Goose When canada goose womens outlet ice sheets or glaciers melt, the newly exposed ground rises, because it is free of its heavy burden. GPS monitoring reveals that the land in northeast Greenland started to spring up in 2003, Khan and his colleagues discovered. Before then, the land was relatively stable. cheap Canada Goose

canada goose clearance There have been other hints of ice melting in northeast Greenland. In the last canada goose outlet canada decade, observers have noted new icebergs and giant cracks in glaciers here. canada goose clearance

canada goose store Unusually warm air temperatures in 2002 through 2004 triggered the ice loss in northeast Greenland, Khan said. The warm air meant there was less sea ice where glaciers like Zachariae enter the ocean. Sea ice acts like a dam, holding back flowing glaciers. The missing ice meant the northeastern glaciers could accelerate towards the sea, dropping more icebergs to boot. Since 2004, canada goose parka uk temperatures have gotten colder but the glaciers continue their rapid pace toward the sea, the researchers found. [10 Surprising Results of Global Warming]. canada goose store

canada goose clearance sale Major ice drainages in Greenland overlain on a map of measured ice surface velocities. The northeast Greenland ice stream canada goose outlet toronto (NEGIS), Jakobshavn Isbr (JI), Helheim Glacier (HG) and Kangerdlugssuaq (KG) catchments are shown. canada goose clearance sale

canada goose deals Combined image by Kristian Kjellerup Kjeldsen, Natural History Museum of Denmark; courtesy of The Ohio canada goose outlet website legit State University. «This study shows that ice loss in the northeast is now accelerating. So, now it seems that all of the margins of the Greenland ice sheet are unstable.»Melting ice, rising seas canada goose deals

Researchers do agree that Greenland’s ice loss has doubled in the last decade, closing in on 400 billion tons per year. More ice is melting than is being replaced by snow.

buy canada goose jacket However, there is disagreement on what the ice loss in Greenland means for future sea level rise. Some canada goose outlet reviews models show that many of Greenland’s glaciers will eventually slow or even halt their retreat as they shrink back toward choke points in their rocky valleys. buy canada goose jacket

canada goose coats The current consensus is that sea level could rise by 11 inches to 38 inches (28 to 98 centimeters) by 2100, according to the latest IPCC report. One of the biggest questions in this estimate is how fast the ice sheets will melt. canada goose coats

«Greenland is very complex and it’s very, very difficult to predict what will happen in the future,» Khan said. «This also means our future estimates of sea level rise are also difficult to predict.»

And until now, researchers thought northeast Greenland’s glaciers weren’t kicking in to the increase in melting. «This suggests that Greenland’s contribution to global sea level rise may be even higher in the future,» Bevis said.

Canada Goose can gabapentin get you high. Jackets But Joughin thinks the numbers don’t add up. «I’m not sure how they arrive at these high thinning rates,» he said. «I just don’t agree with the numbers they’re coming up with.» Canada Goose Jackets

Canada Goose Outlet Expect the debate to advance soon, because other scientists have new results from canada goose outlet eu northeast Greenland that should be published later this year. «This paper highlights that while we know a lot about Greenland, there is work to do to really nail down the numbers,» said Richard Alley, a glaciologist at Penn State University, who was not involved in the study but is currently working on buy canada goose uk northeast Greenland research. Original article on Live Science Canada Goose Outlet.

19 октября 2014 - Сергей Ермилов - 0 - Новости / Просмотров: 132