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09/22/2004:

"Antarctic Glaciers Melting Faster"

WASHINGTON - Glaciers once held up by a floating ice shelf off Antarctica are now sliding off into the sea -- and they are going fast, scientists said on Tuesday.

Two separate studies from climate researchers and the space agency NASA show the glaciers are flowing into Antarctica's Weddell Sea, freed by the 2002 breakup of the Larsen B ice shelf.

Writing in the journal Geophysical Research Letters, the researchers said their satellite measurements suggest climate warming can lead to rapid sea level rise.

The teams at NASA's Jet Propulsion Laboratory in Pasadena, California, the National Snow and Ice Data Center at the University of Colorado in Boulder, and NASA's Goddard Space Flight Center in Greenbelt, Maryland, said the findings also prove that ice shelves hold back glaciers.

Many teams of researchers are keeping a close eye on parts of Antarctica that are steadily melting.

Large ice shelves in the Antarctic Peninsula disintegrated in 1995 and 2002 as a result of climate warming. But these floating ice shelves did not affect sea level as they melted.

Glaciers, however, are another story. They rest on land and when they slide off into the water they instantly affect sea level.

It was not clear how the loss of the Larsen B ice shelf would affect nearby glaciers.

But soon after its collapse, researchers saw nearby glaciers flowing up to eight times faster than before.

"If anyone was waiting to find out whether Antarctica would respond quickly to climate warming, I think the answer is yes," said Theodore Scambos, a University of Colorado glacier expert who worked on one study.

"We've seen 150 miles of coastline change drastically in just 15 years."

Full Article: commondreams.com