Latest modelling shows northern polar waters ice-free in 5-6 years.

"In the end, it will just melt away quite suddenly." - Professor Peter Wadhams

"Some models have not been taking proper account of the physical processes that go on," he commented.

"The ice is thinning faster than it is shrinking; and some modellers have been assuming the ice was a rather thick slab.

"Wieslaw's model is more efficient because it works with data and it takes account of processes that happen internally in the ice."

He cited the ice-albedo feedback effect in which open water receives more solar radiation, which in turn leads to additional warming and further melting.

Professor Wadhams said the Arctic was now being set up for further ice loss in the coming years.

"The implication is that this is not a cycle, not just a fluctuation. The loss this year will precondition the ice for the same thing to happen again next year, only worse.

"There will be even more opening up, even more absorption and even more melting.

clipped from news.bbc.co.uk Scientists in the US have presented one of the most dramatic forecasts yet for the disappearance of Arctic sea ice. Their latest modelling studies indicate northern polar waters could be ice-free in summers within just 5-6 years. Professor Wieslaw Maslowski told an American Geophysical Union meeting that previous projections had underestimated the processes now driving ice loss. Summer melting this year reduced the ice cover to 4.13 million sq km, the smallest ever extent in modern times.