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More Greenland Ice Flowing Into Sea, in Sign of Warming
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| Contributor | ArmyDem |
| Last Edited | ArmyDem Feb 16, 2006 06:17pm |
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| Category | News |
| Media | Newspaper - New York Times |
| News Date | Friday, February 17, 2006 12:00:00 AM UTC0:0 |
| Description | By ANDREW C. REVKIN
Published: February 16, 2006
The amount of ice flowing into the sea from large glaciers in southern Greenland has almost doubled in the last 10 years, possibly requiring scientists to increase estimates of how much seas could rise under the influence of global warming, according to a study to be published Friday in the journal Science.
The authors said there is evidence that the rise in flows will soon spread to glaciers farther north on the vast island of Greenland, which is covered with an ancient ice sheet nearly two miles high in places that holds enough water to raise global sea levels 20 feet or more should it all flow into the ocean.
The study compared various satellite measurements of the creeping ice in 1996, 2000, and 2005 and was done by researchers at NASA's Jet Propulsion Laboratory in Pasadena, Calif., and the University of Kansas.
Glaciers are creeping rivers of ice that accelerate or slow and grow thicker or shrink depending on the interplay of conditions including rates of snowfall, temperature and whether water lubricates the interface between ice and the rock below.
Sometimes the rate of movement in a particular glacier can change abruptly, but the speedup in Greenland has been detected simultaneously in many different glaciers, said Eric J. Rignot, the study author from the NASA laboratory, who has extensively studied glacier flows at both ends of the earth. |
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