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11/20/2007

New Zealand glaciers retreat due to global warming

Image: An iceberg off Dunedin. New Zealand's largest glaciers are retreating fast in the face of global warming and could disappear altogether, scientists said on Nov 19.

WELLINGTON (AFP) -New Zealand's largest glaciers are retreating fast in the face of global warming and could disappear altogether, scientists said Monday.

A report by the National Institute of Water and Atmospheric Research (NIWA) said the volume of ice in New Zealand's Southern Alps had shrunk almost 11 percent in the past 30 years.

More than 90 percent of this loss was because the 12 largest glaciers in the mountain range were melting due to rising temperatures, NIWA said.

The glaciers have passed a threshold, causing the ice to collapse and creating large lakes at their base, the report said.

"The 12 big glaciers with these pro-glacial lakes have passed a tipping point," said NIWA's principal scientist Jim Salinger.

"It is not yet clear whether the glaciers will disappear completely with future warming, but they are set to shrink further as they adjust to today’s climate," he said.

"And it is already clear that they will not return to their earlier lengths without extraordinary cooling of the climate, because the large lakes now block their advance."

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