Greenland’s Summer Mega Melt

 Extent of surface melt over Greenland's ice sheet on July 8, 2012 (left) and July 12, 2012 (right), melting shown in pink: Jesse Allen, NASA Earth Observatory and Nicolo E. DiGirolamo, SSAI and Cryospheric Sciences LaboratoryExtent of surface melt over Greenland’s ice sheet on 08 July 2012 (left) and 12 July 2012 (right), melting shown in pink: Jesse Allen, NASA Earth Observatory and Nicolo E. DiGirolamo, SSAI and Cryospheric Sciences Laboratory Satellites recorded an unprecedented rate of ice sheet melt in Greenland this month. Over the course of four days in July virtually the entire surface melted—an area larger than at any time in more than 30 years of satellite observations.

On average about half the surface area of the ice sheet melts in summer. But between 08 and 12 July 2012 the melt spread from 40 percent to 97 percent of the Greenland ice sheet.

A researcher at NASA’s Jet Propulsion Laboratory in Pasadena was analyzing radar data from the Indian Space Research Organisation’s (ISRO) Oceansat-2 satellite last week when he noticed that most of Greenland appeared to be melting.

The extreme melt coincided with a heat dome over Greenland—one of a series of unusually strong ridges of warm air dominating Greenland’s weather since May. Each successive ridge has been stronger than the previous one this summer.

Atmopsheric carbon dioxide measurements at Summit, Greenland, 1985-2010: NOAA | Earth System Reserach LaboratoryAtmospheric carbon dioxide measurements at Summit, Greenland, 1996-2010: NOAA | Earth System Research Laboratory

Even the NOAA observatory Summit Station in central Greenland—2 miles (3.2 kilometers) above sea level and near the highest point of the ice sheet—showed signs of melt. Such widespread thawing has not occurred since 1889, according to ice-core analyses.

“Ice cores from Summit show that melting events of this type occur about once every 150 years on average. With the last one happening in 1889, this event is right on time,” said Lora Koenig, a Goddard glaciologist and a member of the research team analyzing the satellite data. “But if we continue to observe melting events like this in upcoming years, it will be worrisome.” 

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SIX TRUTHS

Reclaiming power from those who abuse it often starts with telling the truth. And in "This Is How Authoritarians Get Defeated," MoJo's Monika Bauerlein unpacks six truths to remember during the homestretch of an election where democracy, truth, and decency are on the line.

Truth #1: The chaos is the point.

Truth #2: Team Reality is bigger than it seems.

Truth #3: Facebook owns this.

Truth #4: When we go to work, we're in the fight.

Truth #5: It's about minority rule.

Truth #6: The only thing that can save us is…us.

Please take a moment to see how all these truths add up, because what happens in the weeks and months ahead will reverberate for at least a generation and we better be prepared.

And if you think journalism like Mother Jones'—that calls it like it is, that will never acquiesce to power, that looks where others don't—can help guide us through this historic, high-stakes moment, and you're able to right now, please help us reach our $350,000 goal by October 31 with a donation today. It's all hands on deck for democracy.

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