The giant Ayles Ice Island drifting off Canada's northern shores has broken in two - far earlier than expected.
In a season of record summer melting in the region, the two chunks have moved rapidly through the water - one of them covering 98km (61 miles) in a week.
Their progress has been tracked amid fears they could edge west towards oil and gas installations off Alaska.
The original Manhattan-sized berg (16km by five km; 10 miles by three miles) broke off the Ayles Ice Shelf in 2005....
"The island became more vulnerable to breaking up with the warmer temperatures in more southerly latitudes, together with having less protection from the smaller amounts of surrounding sea-ice.
"It's relatively unusual for the ice island to drift so far south so quickly - many ice islands in the past have stayed within the Arctic Ocean, or within the northern parts of the Queen Elizabeth Islands."
Dr Copland said that the island had travelled so far south because of the small extent of Arctic ice this summer, influenced in turn by warmer conditions.
"The low sea-ice conditions this year have played a role. The sea-ice normally blocks ice inflow into the Queen Elizabeth Islands, but with less ice this year it has made it easier for the Ice Island to make its way in."
...The team which landed on the Ayles ice block in May found it to have an average thickness of 42-45m (138-148ft) - the equivalent of the height of a 10-storey building. The great mass of ice has now split apart.
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