Scientists now fear increasingly warmer water in daily tides are doing much more damage to one of Greenland's glaciers than they thought
At remote Petermann, where few people have been and there are no base camps, that grounding line zone is more than six-tenths of a mile wide and could be as much as 3.7 miles wide, the study said.
“The sea water actually goes much farther beneath the grounded ice , kilometers, not hundreds of meters,” Rignot said. “And that water is full of heat and able to melt the glaciers vigorously. And it's kind of the most sensitive part of the glacier.” Rignot this month is exploring Petermann to get more ground-based measurements using ultrasound. He hasn't been there since 2006, a decade before the changes were seen via satellite. Visiting Petermann, even before the glacier's retreat accelerated, Rignot said he noticed movements that make it seem like a living thing.
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Greenland Ice Sheet melting faster than previously thought, scientists sayScientists have determined that in the last 10 to 20 years of steady global warming, the ocean has played an 'important role' in the evolution of glaciers, Eric Rignot, professor of system science at the University of California, Irvine, and author of the study, told ABC News. Melting at the interface between ice sheets and the ocean in the Arctic is much more extensive than previously estimated, according to a study published Monday in Proceedings of the National Academy of Sciences. What is happening at the grounding line -- the junction between a grounded ice sheet and the ocean -- led the researchers to discover much more melting that previously thought at Petermann Glacier in Greenland, according to the paper.
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