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Mother Nature's "Disaster Management": Halts Greenland's Ice Sheet Ocean Slide
According to a report in New Scientist, Greenland's mighty ice sheet has enough water locked away to raise global sea level 6.5 metres were it to melt. Each summer, vast lakes of meltwater form on its surface.
The water seeps through cracks in the kilometer-thick ice to bedrock, where it acts as a lubricant. The sheet can move up to twice as fast in the summer, when meltwater is flowing, as when it is not.
Many fear a positive feedback loop, whereby the accelerating flow will bring more ice down out of the mountains and toward warmer temperatures near sea level.
Roderik Van De Waal and colleagues at Utrecht University in the Netherlands now say there is no evidence this will happen.
According to the research team, who has studied the longest available record of ice and water flow in the region, since 1991, the western edge of Greenland's ice sheet has actually slowed its ocean-bound progress by 10%.
They looked at how meltwater has correlated with the speed of ice flow at the western edge of the sheet, just north of the Arctic Circle, since 1991.
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