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Study Finds Greenland Glaciers Losing 10 Billion Tons of Ice Per Year

Climate

The glaciers of northeast Greenland, long thought to be the most stable part of the massive Greenland ice sheet, are melting at an accelerating pace, losing roughly 10 billion tons of ice annually for the past decade, say researchers from the U.S. and Denmark.

This map shows major ice drainages in Greenland, along with measured ice surface velocities. The northeast Greenland ice stream (NEGIS) now appears to be retreating as rapidly, or perhaps more rapidly, than other parts of the ice sheet, including Jakobshavn Isbræ (JI), Helheim Glacier (HG) and Kangerdlugssuaq (KG). Catchments for those regions are outlined on the map. Image credit: The Ohio State University, Natural History Museum of Denmark

The finding will likely boost estimates of global sea level rise, which had previously not accounted for massive ice loss from that region, scientists say. The Zachariae ice stream in northeast Greenland, which drains 16 percent of the ice sheet, has retreated roughly 12.4 miles during the past decade, outpacing the fast-moving Jakobshavn glacier, which has retreated 21.7 miles over the last 150 years.

Ice loss from the region is likely accelerating, the researchers say, because ice dams in nearby bays that had been blocking the glaciers' paths are now also melting, freeing the way for them to flow into the ocean.

"Northeast Greenland is very cold—it used to be considered the last stable part of the Greenland ice sheet," explained the lead researcher of the report, which was published in Nature Climate Change. "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."

Other recent studies had estimated more moderate ice loss from Greenland's northeast.

Visit EcoWatch’s CLIMATE CHANGE page for more related news on this topic.

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