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A Manhatten on Ice
Topic Started: Sep 8 2008, 10:49 PM (264 Views)
Tidbits

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http://www.adn.com/news/alaska/story/519353.html

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A chunk of ice shelf nearly the size of Manhattan has broken away from Ellesmere Island in Canada's northern Arctic


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Derek Mueller, an Arctic ice shelf specialist at Trent University in Ontario, said the 4,500-year-old Markham Ice Shelf separated in early August and the 19-square-mile shelf is now adrift in the Arctic Ocean.

"The Markham Ice Shelf was a big surprise because it suddenly disappeared. We went under cloud for a bit during our research and when the weather cleared up, all of a sudden there was no more ice shelf. It was a shocking event that underscores the rapidity of changes taking place in the Arctic," said Mueller.

Mueller also said that two large sections of ice detached from the Serson Ice Shelf, shrinking that ice feature by 47 square miles -- or 60 percent -- and that the Ward Hunt Ice Shelf has also continued to break up, losing an additional eight square miles.

Mueller reported last month that seven square miles of the 170-square-mile and 130-feet-thick Ward Hunt shelf had broken off.

This comes on the heels of unusual cracks in a northern Greenland glacier, rapid melting of a southern Greenland glacier, and a near record loss for Arctic sea ice this summer. And earlier this year a 160-square mile chunk of an Antarctic ice shelf disintegrated.


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Martin Jeffries of the U.S. National Science Foundation and University of Alaska Fairbanks said in a statement that the summer's ice shelf loss is equivalent to over three times the area of Manhattan, totaling 82 square miles -- losses that have reduced Arctic Ocean ice cover to its second-biggest retreat since satellite measurements began 30 years ago.

"These changes are irreversible under the present climate and indicate that the environmental conditions that have kept these ice shelves in balance for thousands of years are no longer present," said Mueller.

During the last century, when ice shelves would break off, thick sea ice would eventually reform in their place.

"But today, warmer temperatures and a changing climate mean there's no hope for regrowth. A scary scenario," said Mueller.

The loss of these ice shelves means that rare ecosystems that depend on them are on the brink of extinction, said Warwick Vincent, director of Laval University's Centre for Northern Studies and a researcher in the program ArcticNet.

"The Markham Ice Shelf had half the biomass for the entire Canadian Arctic Ice Shelf ecosystem as a habitat for cold, tolerant microbial life; algae that sit on top of the ice shelf and photosynthesis like plants would. Now that it's disappeared, we're looking at ecosystems on the verge of extinction,' said Mueller.

Along with decimating ecosystems, drifting ice shelves and warmer temperatures that will cause further melting ice pose a hazard to populated shipping routes in the Arctic region -- a phenomenon that Canada's Prime Minister Stephen Harper seems to welcome.

Harper announced recently that he plans to expand exploration of the region's known oil and mineral deposits, a possibility that has become more evident as a result of melting sea ice. Harper also said Canada would toughen reporting requirements for ships entering its waters in the Far North, where some territorial claims are disputed by the United States and other countries.
Edited by Tidbits, Sep 8 2008, 10:58 PM.
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