What is under Greenland’s ice?

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We have been watching surface melting of the Greenland Ice Sheet (see Greenland Ice Sheet Today) as one sign of climate change. Covering some 656,000 square miles and ranging from 1 to 2 miles thick, this mass of ice is often considered a bellwether for change in the Arctic. But there is still much to know about what goes on beneath its surface. Recently, scientists were surprised to find evidence of soil underneath the Greenland Ice Sheet. Why is it there? And what does it reveal about the history of the ice sheet? Continue reading

Can liquid water persist within an ice sheet?

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Scientists have discovered a large aquifer, the size of Ireland, near the surface of the Greenland Ice Sheet. “This was a big surprise,” said Jason Box, a researcher for the Geological Survey of Denmark and Greenland, “because we were drilling before melt had begun.” So liquid water had to survive since at least the previous year. Such water storage within the ice had not been previously considered, not on this massive scale. How can a giant reservoir of water exist inside a frozen ice sheet? Continue reading