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Multiyear Arctic Ocean ice is effectively gone, expert says
But David Barber, Canada’s Research Chair in Arctic System Science at the University of Manitoba, said the ice was melting at an extraordinarily fast rate. “We are almost out of multiyear sea ice in the northern hemisphere,” he said in a presentation in Parliament. The little that remains is jammed up against Canada’s Arctic archipelago, far from potential shipping routes.
Scientists link higher Arctic temperatures and melting sea ice to the greenhouse gas emissions blamed for global warming.
Barber spoke shortly after returning from an expedition that sought -- and largely failed to find -- a huge multiyear ice pack that should have been in the Beaufort Sea off the Canadian coastal town of Tuktoyaktuk. Instead, his ice breaker found hundreds of miles of what he called “rotten ice” -- 50-cm (20-inch) thin layers of fresh ice covering small chunks of older ice.
“I’ve never seen anything like this in my 30 years of working in the high Arctic ... it was very dramatic,” he said. “From a practical perspective, if you want to ship across the pole, you’re concerned about multiyear sea ice. You’re not concerned about this rotten stuff we were doing 13 knots through. It’s easy to navigate through.” Scientists have fretted for decades about the pace at which the Arctic ice sheets are shrinking. U.S. data shows the 2009 ice cover was the third-lowest on record, after 2007 and 2008.
An increasing number of experts feel the North Pole will be ice free in summer by 2030 at the latest, for the first time in a million years.
“I would argue that, from a practical perspective, we almost have a seasonally ice-free Arctic now, because multiyear sea ice is the barrier to the use and development of the Arctic,” said Barber.
Fresh first-year ice always forms in the Arctic in the winter, when temperatures plunge far below freezing and the North Pole is not exposed to the sun.
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