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UN sounds warning after Antarctica ice shelf rips
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UN sounds warning after Antarctica ice shelf rips
AFP - Wednesday, April 8
PARIS (AFP) - - The UN Environment Programme (UNEP) said the breakway of a Jamaica-sized ice shelf from the Antarctic peninsula could accelerate global warming in this already vulnerable region.
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Satellite pictures show a 40-kilometre (25-mile) ice bridge that was the Wilkins Ice Shelf's last link to the coast had now shattered at its narrowest point, about 500 metres (yards) wide, UNEP said.
The Wilkins Ice Shelf once covered around 16,000 square kilometres (6,000 square miles) before it began to retreat in the 1990s, and by last May the ice bridge was all that connected it to Charcot and Latady islands.
The loss of the bridge "may now allow ocean currents to wash away far more of the shelf," UNEP said.
Christian Lambrechts, a policy and programme officer with UNEP's Division of Early Warning and Assessment, said this would expose more of the sea's surface to sunlight, rather than reflect it, in turn "contributing to continued and accelerated warming."
The Antarctic peninsula -- the tongue of land that juts up towards South America -- has been hit by greater warming than almost any other region on Earth.
In the past 50 years, temperatures have risen by 2.5 degrees Celsius (4.5 degrees Fahrenheit), around six times the global average.
Ice shelves are ledges of thick ice that float on the sea and are attached to the land. They are formed when ice is exuded from ice sheet on land.
The Antarctic ice shelves do not add to sea levels when they melt. Like the Arctic ice cap, they float on the sea and thus displace their own volume.
But the loss of an ice shelf means that the glaciers that feed it may flow out straight to the sea, as if from an uncorked bottle.
"Although the Wilkins ice bridge collapse will have no direct consequence on sea level rise, it might have an indirect impact, as the decay of the ice shelf will reduce the stability of the glaciers that are feeding it," said Lambrechts.
In the past 20 years, Antarctica has lost seven ice shelves.
The process is marked by shrinkage and the breakaway of increasingly bigger chunks before the remainder of the shelf snaps away from the coast.
It then disintegrates into debris or into icebergs that eventually melt as they drift northwards.
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Enlarge Photo
Handout photo released in 2008 by the British Antarctic Survey shows of a chunk of ice that started to break away from the Antarctic Wilkins Ice Shelf. The UN Environment Programme (UNEP) said the breakway of a Jamaica-sized ice shelf from the Antarctic peninsula could accelerate global warming in this already vulnerable region.
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