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Arctic’s strongest sea ice breaks up for first time

Scientists are warning that the ice has broken up twice this year, due to warm winds and heatwaves in the northern hemisphere - Barcroft Media
Scientists are warning that the ice has broken up twice this year, due to warm winds and heatwaves in the northern hemisphere - Barcroft Media

The thickest sea ice in the Arctic has started to break up, opening waters north of Greenland that are normally frozen, experts have warned.

One meteorologist described the phenomenon – recorded for the first time this year – as “scary”.

Others saying it could force scientists to revise their theories about which part of the Arctic will withstand global warming the longest.

The sea off the north coast of Greenland had long been known as “the last ice area” because it was expected to be the last place to remain frozen, given it had the oldest and thickest ice.

But now scientists are warning that the ice has broken up twice this year, due to warm winds and heatwaves in the northern hemisphere.

The thick old sea ice will have been pushed away from the coast, to an area where it will melt more easily

Thomas Lavergne, Norwegian Meteorological Institute

As a result, the ice has been pushed further away from the coast than at any time since satellite records began in the 1970s, the trends show.

Ruth Mottram of the Danish Meteorological Institute said: “Almost all of the ice to the north of Greenland is quite shattered and broken up and therefore more mobile.”

“Open water off the north coast of Greenland is unusual. This area has often been called ‘the last ice area’ as it has been suggested that the last perennial sea ice in the Arctic will occur here. The events of the last week suggest that, actually, the last ice area may be further west.”

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Walt Meier, a senior research scientist at the US National Snow and Ice Data Center, said: “The ice there has nowhere else to go so it piles up. On average, it’s over four metres thick and can be piled up into ridges 20 metres thick or more. This thick, compacted ice is generally not easily moved around.

“However, that was not the case this past winter (in February and March) and now. The ice is being pushed away from the coast by the winds.”

Thomas Lavergne, a scientist at the Norwegian Meteorological Institute, described satellite pictures of blue water penetrating white ice as “scary”.

Even if the water closes over in a few days, the harm will be done, he said.

“The thick old sea ice will have been pushed away from the coast, to an area where it will melt more easily.”