Friday, July 27, 2012

Grand Canyon-sized CHASM hastens Antarctic melt

The University of Aberdeen and British Antarctic Survey (BAS) scientists returned to the Ferrigno Ice Stream, a region of the frozen continent only visited once before in 1961, and found a one-mile (1.6km) deep chasm under the ice.

The West Antarctic Ice Sheet is losing ice faster than any other region of the continent, with some glaciers shrinking by more than one metre a year, so boffins have figured that something else other than global warming (or whatever is causing the ice to melt) is at work.

To find out what that something is, the team went out on the ice in 2010 and dragged an ice-penetrating radar system behind a snowmobile for 1,500 miles (2,414km).

"What we found is that lying beneath the ice there is a large valley, parts of which are approximately a mile deeper than the surrounding landscape," said Dr Robert Bingham, a glaciologist at the uni.

“If you stripped away all of the ice here today, you’d see a feature every bit as dramatic as the huge rift valleys you see in Africa and in size as significant as the Grand Canyon. Read More