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solonavi 27 June 2008 Arctic, Climate, Global Warming 463 views No Comment Print This Post  Email This Post

independent.co.uk

It seems unthinkable, but for the first time in human history, ice is on course to disappear entirely from the North Pole this year.

The disappearance of the Arctic sea ice, making it possible to reach the Pole sailing in a boat through open water, would be one of the most dramatic – and worrying – examples of the impact of global warming on the planet. Scientists say the ice at 90 degrees north may well have melted away by the summer.

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If it happens, it raises the prospect of the Arctic nations being able to exploit the valuable oil and mineral deposits below these a bed which have until now been impossible to extract because of the thick sea ice above.

Seasoned polar scientists believe the chances of a totally ice-free North Pole this summer are greater than 50:50 because the normally thick ice formed over many years at the Pole has been blown away and replaced by huge swathes of thinner ice formed over a single year.

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Each summer the sea ice melts before reforming again during the long Arctic winter but the loss of sea ice last year was so extensive that much of the Arctic Ocean became open water, with the water-ice boundary coming just 700 miles away from the North Pole.

This meant that about 70 per cent of the sea ice present this spring was single-year ice formed over last winter. Scientists predict that at least 70 per cent of this single-year ice – and perhaps all of it – will melt completely this summer, Dr Serreze said.

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Ron Lindsay, a polar scientist at the University of Washington in Seattle, agreed that much now depends on what happens to the Arctic weather in terms of wind patterns and hours of sunshine. “There’s a good chance that it will all melt away at the North Pole, it’s certainly feasible, but it’s not guaranteed,” Dr Lindsay said.

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There are other indications that the Arctic sea ice is showing signs of breaking up. Scientists at the Nasa Goddard Space Flight Centre said that the North Water ‘polynya’ – an expanse of open water surrounded on all sides by ice – that normally forms near Alaska and Banks Island off the Canadian coast, is much larger than normal. Polynyas absorb heat from the sun and eat away at the edge of the sea ice.

Inuit natives living near Baffin Bay between Canada and Greenland are also reporting that the sea ice there is starting to break up much earlier than normal and that they have seen wide cracks appearing in the ice where it normally remains stable. Satellite measurements collected over nearly 30 years show a significant decline in the extent of the Arctic sea ice, which has become more rapid in recent years.

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