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Ward Hunt Ice Shelf, Largest In Northern Hemisphere, Has Fractured Into Three Main Pieces

Date:
April 16, 2008
Source:
Trent University
Summary:
The largest ice shelf in the Northern Hemisphere has fractured into three main pieces. During a recent patrol across the northernmost parts of Canada, researchers found a new 18 kilometer-long network of cracks running from the southern edge of the Ward Hunt Ice Shelf to the Arctic Ocean. This accompanies a large central fracture that was first detected in 2002, and raises the concern that the remaining ice shelf will disintegrate within the next few years.

Derek Mueller stands by a crack in the ice sheet.
Credit: Denis Sarrazin

A team of scientists including polar expert Dr. Derek Mueller from Trent University and Canadian Rangers have discovered that the largest ice shelf in the Northern Hemisphere has fractured into three main pieces.

During their sovereignty patrol across the northernmost parts of Canada over the last two weeks, they visited a new 18 kilometre-long network of cracks running from the southern edge of the Ward Hunt Ice Shelf to the Arctic Ocean. This accompanies a large central fracture that was first detected in 2002, and raises the concern that the remaining ice shelf will disintegrate within the next few years.

Evidence of these cracks first came from Radarsat satellite images in February. Confirmation came from Canadian Rangers, partnering with International Polar Year scientists during Operation NUNALIVUT 08, a Canadian Forces High Arctic sovereignty patrol. Rangers mapped the extent of the fissures and monitored melt rates for Quttinirpaaq National Park, which encompasses the ice shelf.

The patrol scientists also found that the nearby Petersen Ice Shelf lost over a third of its surface area in the past three years. This ice shelf calved following the break-up of landfast sea ice in the summer of 2005 and 2007, which had protected it from the open ocean.

“Canadian ice shelves have undergone substantial changes in the past six years, starting with the first break-up event on the Ward Hunt Ice Shelf, and the loss of the Ayles Ice Shelf,” said Dr. Luke Copland of the University of Ottawa. “These latest break-ups we are seeing have come after decades of warming and are irreversible,” said Dr. Derek Mueller of Trent University.

Only five large ice shelves remain in Arctic Canada, covering less than a tenth of the area than they did a century ago.

Derek Mueller holds Trent's Roberta Bondar Fellowship in Northern and Polar Studies.


Story Source:

The above story is based on materials provided by Trent University. Note: Materials may be edited for content and length.


Cite This Page:

Trent University. "Ward Hunt Ice Shelf, Largest In Northern Hemisphere, Has Fractured Into Three Main Pieces." ScienceDaily. ScienceDaily, 16 April 2008. <www.sciencedaily.com/releases/2008/04/080415205350.htm>.
Trent University. (2008, April 16). Ward Hunt Ice Shelf, Largest In Northern Hemisphere, Has Fractured Into Three Main Pieces. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2008/04/080415205350.htm
Trent University. "Ward Hunt Ice Shelf, Largest In Northern Hemisphere, Has Fractured Into Three Main Pieces." ScienceDaily. www.sciencedaily.com/releases/2008/04/080415205350.htm (accessed July 25, 2014).

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