Monster heat wave reaches Greenland, bringing rain and melting its ice sheet

NASA's Oceans Melting Greenland (OMG) mission warns the ice sheet is more at risk to global warming than we knew.

Joe Romm
Nov 29, 2017

It’s been unusually warm in the United States in recent days, with records being set across the country. But it’s been scorching in Greenland, with temperatures as much as 54° above normal, which means above freezing in many places.

And this comes on the heels of new research from NASA’s aptly-named Oceans Melting Greenland (OMG) mission, which finds that the enormous ice sheet is far more unstable than we realized. That’s bad news because the Greenland ice sheet contains enough land-locked ice to raise sea levels by over 20 feet.

The heat wave began out west last week, with large parts of California sweltering in the 90s. As but one example, the National Weather Service Los Angeles tweeted on Nov. 22 that the 99°F reading at Camarillo Airport in Ventura County not only broke the record for that day (by 9°F), but broke the record for any day that month.

The heat wave moved east after Thanksgiving, and by Tuesday it was blanketing most of the country, as meteorologist and Grist writer Eric Holtaus pointed out on Twitter:

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in a place like Greenland, a monster heat wave this time of year pushes temperatures above freezing. It hit the upper 30s in many coastal towns — with rain forecast in some — which means actual melting over parts of the great ice sheet that should be adding ice right now, not losing it.

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The bottom line is that over half of the entire ice sheet may be at risk from this underwater melting. We knew that global warming is leading to more of the kind of monster heatwaves that intensify and extend the surface melt season on Greenland — the kind it is now experiencing. But we are learning that global warming poses a potentially larger risk to underwater melt from warming ocean waters.

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