The results overturn a long-held view that the world’s largest island was an impregnable fortress of ice. Read more at straitstimes.com.
WASHINGTON - A mile-thick ice sheet in Greenland vanished around 416,000 years ago during a period of moderate natural warming, driving global sea rise to levels that would spell catastrophe for coastal regions today, a study said Thursday.
The research relied on an ice core extracted 1,390 metres under the surface of Northwest Greenland by scientists at Camp Century, a secretive US military base that operated in the 1960s. Key among these is “luminescence dating,” which allowed scientists to determine the last time that sediment buried beneath the Earth’s surface was exposed to light.
“And the only way to do that at Camp Century is to remove a mile of ice,” said Professor Tammy Rittenour, a co-author of the study at Utah State University. “Plus, to have plants, you have to have light.”Luminescence dating provided the end point of the ice-free period, with the start point coming from another technique.
They found the sediment was exposed for less than 14,000 years, meaning this was how long the area was ice-free.The Camp Century core was taken only 1,287km from the North Pole, with the study showing the entire region would have been covered in vegetation. This suggests that every coastal region of the world, home to many global population centres, are at risk of submersion in the coming centuries.
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