The Greenland ice cap is melting so quickly that it is triggering earthquakes as pieces of ice several cubic kilometers in size break off.
Scientists monitoring events this summer say the acceleration could be catastrophic in terms of sea-level rise and make predictions in February by the Intergovernmental Panel on Climate Change (IPCC) far too low.
The glacier at Ilulissat, which supposedly spawned the iceberg that sank the Titantic, is now flowing three times faster into the sea than it was 10 years ago.
acceleration
Robert Corell, chairman of the Arctic Climate Impact Assessment, said in Ilulissat on Friday: "We have seen a massive acceleration of the speed with which these glaciers are moving into the sea. The ice is moving at 2 meters an hour on a front 5km long and 1,500 meters deep. That means that this one glacier puts enough fresh water into the sea in one year to provide drinking water for a city the size of London for a year."
He is visiting Greenland as part of a symposium of religious, scientific, and political leaders to look at the problems of the island, which has an ice cap 3km thick containing enough water to raise worldwide sea levels by 7m.
On Friday Christian, Shia, Sunni, Hindu, Shinto, Buddhist and Jewish religious leaders took a boat to the tongue of the glacier for a silent prayer for the planet. They were invited by Bartholomew I, the spiritual leader of 250 million Orthodox Christians worldwide.
catastrophic
Corell, director of the global change program at the Heinz Center in Washington, said the estimates of sea level rise in the IPCC report were based on data two years old. The predicted rise this century was 20cm to 60cm, but it would be at the upper end of this range at a minimum, he said, and some believed it could be 2m. This would be catastrophic for European coastlines.
He had flown over the Ilulissat glacier and "seen gigantic holes in it through which swirling masses of melt water were falling. I first looked at this glacier in the 1960s and there were no holes. These so-called moulins, 10m to 15m across, have opened up all over the place. There are hundreds of them."
This melt water was pouring through to the bottom of the glacier creating a lake 500m deep which was causing the glacier "to float on land. These melt-water rivers are lubricating the glacier, like applying oil to a surface and causing it to slide into the sea. It is causing a massive acceleration which could be catastrophic."
surges
The glacier is now moving at 15km a year into the sea although in surges it moves even faster. He measured one surge at 5km in 90 minutes -- an extraordinary event.
Veli Kallio, a Finnish scientist, said the quakes were triggered because ice had broken away after being fused to the rock for hundreds of years. The quakes were not vast -- on a magnitude of 1 to 3 -- but had never happened before in northwest Greenland and showed potential for the entire ice sheet to collapse.
"These earthquakes are not dangerous in themselves but the fact that they are happening shows that events are happening far faster than we ever anticipated," Corell said.
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