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Thread: Magma May Be Melting Greenland Ice

Petermann Floating Tongue in north Greenland.
CREDIT: NASA/JPL

SAN FRANCISCO—Global warming may not be the only thing melting Greenland. Scientists have found at least one natural magma hotspot under the Arctic island that could be pitching in.

In recent years, Greenland’s ice has been melting more and flowing faster into the sea—a record amount of ice melted from the frozen mass this summer, according to recently released data—and Earth’s rising temperatures are suspected to be the main culprit.

But clues to a new natural contribution to the melt arose when scientists discovered a thin spot in the Earth’s crust under the northeast corner of the Greenland Ice Sheet where heat from Earth’s insides could seep through, scientists will report here this week at a meeting of the American Geophysical Union.

“The behavior of the great ice sheets is an important barometer of global climate change,” said lead scientist Ralph von Frese of Ohio State University. “However, to effectively separate and quantify human impacts on climate change, we must understand the natural impacts too.”

The corner of Greenland where the hotspot was found had no known ice streams, the rivers of ice that run through the main ice sheet and out to sea, until one was discovered in 1991. What exactly caused the stream to form was uncertain.

“Ice streams have to have some reason for being there,” von Frese said, “and it’s pretty surprising to suddenly see one in the middle of the ice sheet.”