Post by cerridwen on Oct 12, 2007 5:48:39 GMT
AFP - Thursday, October 11 07:02 pmCOPENHAGEN (AFP) - The ice cap in the northern hemisphere is melting a lot more rapidly that scientists thought, according to new research published Thursday by the Danish National Space Center.
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"Until 2004, the glacier mass in the southeastern part of the island lost about 50 to 100 cubic kilometres (12 to 24 cubic miles) per year. After this date, the melting rate accelerated to 300 cubic kilometres per year. It's a jump of 400 percent, which is very worrying," National Space Center head researcher and project chief Abbas Khan told AFP.
The ice cap, located in Greenland, is melting four times more rapidly than at the beginning of the decade according to the study. Glaciers in southeastern Greenland release icebergs into the sea, corresponding to a giant ice cube measuring 6.5 kilometres (4 miles) per side.
"It's an alarming development," Khan said. "We do not know if it is due to global warming or other factors."
The results of the study were made in conjunction with US-based University of Colorado and published Thursday on an online edition of Geophysical Research Letters magazine.
The researchers measured ice melt with ultra-sensitive Global Positioning Systems (GPS) stations located in the mountains and along the ice cap.
The measurements indicated that the mountains hugging glaciers in the southeastern part of Greenland rose four to five centimetres (1.5 to two inches) per year, and that the banks of the glaciers thinned 100 metres per year.
The Greenland ice cap measures 1.7 million square kilometres (656,000 square miles) and is 3.2 kilometres (two miles) thick.
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"Until 2004, the glacier mass in the southeastern part of the island lost about 50 to 100 cubic kilometres (12 to 24 cubic miles) per year. After this date, the melting rate accelerated to 300 cubic kilometres per year. It's a jump of 400 percent, which is very worrying," National Space Center head researcher and project chief Abbas Khan told AFP.
The ice cap, located in Greenland, is melting four times more rapidly than at the beginning of the decade according to the study. Glaciers in southeastern Greenland release icebergs into the sea, corresponding to a giant ice cube measuring 6.5 kilometres (4 miles) per side.
"It's an alarming development," Khan said. "We do not know if it is due to global warming or other factors."
The results of the study were made in conjunction with US-based University of Colorado and published Thursday on an online edition of Geophysical Research Letters magazine.
The researchers measured ice melt with ultra-sensitive Global Positioning Systems (GPS) stations located in the mountains and along the ice cap.
The measurements indicated that the mountains hugging glaciers in the southeastern part of Greenland rose four to five centimetres (1.5 to two inches) per year, and that the banks of the glaciers thinned 100 metres per year.
The Greenland ice cap measures 1.7 million square kilometres (656,000 square miles) and is 3.2 kilometres (two miles) thick.