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Thirty Years Ago On a camping trip by a remote lake, the Mercer family enjoyed the vacation of a lifetime - until a violent tragedy forced them to make a decision.
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One lake once held billions of gallons of water and emptied to form a mile-wide crater in just a few weeks. The other lake has filled and emptied twice in the last two years.
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Ian Howat , associate professor of earth sciences at Ohio State, leads the team that discovered the cratered lake described in The Cryosphere. The two-mile-wide lake described in Nature was discovered by a team led by researcher Michael Willis of Cornell University. Michael Bevis , Ohio Eminent Scholar in Geodynamics and professor of earth sciences at Ohio State, is a co-author of the Nature paper, and he said that the repeated filling of that lake is worrisome. Each time the lake fills, the meltwater carries stored heat, called latent heat, along with it, reducing the stiffness of the surrounding ice and making it more likely to flow out to sea, he said.
There, previous aerial and satellite imagery indicates that a sub-glacial lake pooled for more than 40 years.
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More recent images suggest that the lake likely emptied through a meltwater tunnel beneath the ice sheet some time in The crater measures 2 kilometers 1. Researchers calculated that the lake that formed it likely contained some 6. And it disappeared in a single season—remarkably quickly by geologic standards. Researchers suspect that, as more meltwater reaches the base of the ice sheet, natural drainage tunnels along the Greenland coast are cutting further inland, Howat explained.
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The tunnels carry heat and water to areas that were once frozen to the bedrock, potentially causing the ice to melt faster. But, if all you need is a bumpy surface a bit inland from the coast, then there could be thousands of little lakes. Bevis and his colleagues discovered the lake described in Nature under similar circumstances in March Michael Bevis , Ohio Eminent Scholar in Geodynamics and professor of earth sciences at Ohio State, is a co-author of the Nature paper, and he said that the repeated filling of that lake is worrisome.
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Each time the lake fills, the meltwater carries stored heat, called latent heat, along with it, reducing the stiffness of the surrounding ice and making it more likely to flow out to sea, he said. There, previous aerial and satellite imagery indicates that a sub-glacial lake pooled for more than 40 years.
More recent images suggest that the lake likely emptied through a meltwater tunnel beneath the ice sheet some time in The crater measures 2 kilometers 1. Researchers calculated that the lake that formed it likely contained some 6.
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And it disappeared in a single season—remarkably quickly by geologic standards. Researchers suspect that, as more meltwater reaches the base of the ice sheet, natural drainage tunnels along the Greenland coast are cutting further inland, Howat explained.
The tunnels carry heat and water to areas that were once frozen to the bedrock, potentially causing the ice to melt faster. But, if all you need is a bumpy surface a bit inland from the coast, then there could be thousands of little lakes.
Bevis and his colleagues discovered the lake described in Nature under similar circumstances in March They were gathering data to supplement their long-standing efforts to weigh the Greenland Ice Sheet with GPS and spotted the mitten-shaped lake by accident. Though researchers have long known of the existence of sub-glacial lakes, never before have they witnessed any draining away.
The sudden discovery of two—one of which seems to be refilling and draining repeatedly—signals to Bevis that Greenland ice loss has likely reached a milestone. We can actually watch these lakes drain out and fill up again in real time.