Ice loss from Greenland has grown by a factor of six since the 1980s, scientists find. The ice sheet has the potential to raise sea levels by over 20 feet, were it all to melt some day.
Tidewater glacier in Southeast Greenland, summer of 2018. By Chris Mooney and Chris Mooney Reporter covering climate change, energy and the environment.
Eric Rignot, an Earth-systems scientist for the University of California at Irvine and NASA who was one of the study’s authors, said in an email Monday that the study places the recent mass losses in Greenland in a longer-term context. “In Antarctica, some big sleeping giants in East Antarctica are waking up, in addition to a large part of West Antarctica being significantly affected. None of this is good news,” Rignot added. “We ought to prepare ourselves for what is coming up and take action as soon as possible to avoid the most drastic scenarios.”
But precisely how much ice has Greenland lost? That’s been a difficult question to answer. But it matters a great deal, since every 360 billion tons equates to a millimeter of sea level rise. Based on the results of models that simulate Greenland’s past climate, “the current melting and runoff is unprecedented over the past 150 years,” Marco Tedesco, a Greenland expert at Columbia University’s Lamont Doherty Earth Observatory, said in an email. He said the paper “also highlights the importance of understanding and quantifying how the glaciers respond to warming and enhanced surface melting.
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