Global warming speeding natural catastrophes right along
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World's Glaciers Rapidly Melting, Causing Quakelike Disruptions
Changes Occurring on Both Ends of the Planet
By CLAYTON SANDELL

March 23, 2006 — - Glaciers and ice sheets at both ends of Earth are
melting ever more quickly from below due to warmer ocean waters,
advancing sometimes in enormous earth-shaking "jolts," new research by
a NASA scientist has found.

Scientists have already determined that Greenland's and Antarctica's
glaciers have melted at accelerating rates because of warmer air
temperatures. But in findings published today in the journal Science,
researchers have presented new evidence that warmer ocean temperatures
also melt the glaciers from below.

"There is a big temperature contrast between the warm ocean water and
the cold ice, and melting occurs at a very rapid rate," said Robert
Bindschadler, a glaciologist at the NASA Goddard Space Flight Center
and author of the study. "The melting reduces the friction that holds
these glaciers back, allowing them to accelerate."

That increased acceleration has led to an increasing frequency of
"glacial earthquakes," according to a separate paper also in Science.

Earthquakes on the Rise

The number of glacial earthquakes has doubled in the past five years
as ice sheets respond to a warming climate, according to a team led by
Harvard University researcher Göran Ekström. Most of the earthquakes
occur in late summer.

"People often think of glaciers as inert and slow moving, but in fact
they can also move rather quickly," Ekström said in a statement. "Some
of Greenland's glaciers, as large as Manhattan and as tall as the
Empire State Building, can move 10 meters in less than a minute, a
jolt that is sufficient to generate moderate seismic waves."

To Ekström, the reason behind all the increased glacier activity is
clear.

"I think it is very hard not to associate this with global warming,"
he said.

Bindschadler, who spoke with reporters on a conference call, said his
new findings are consistent with other recent research that shows
Greenland and Antarctica melting faster, also because of global
warming.

In early March, scientists reported that Greenland's glaciers moved at
twice their expected speed, up to 120 feet per day, which has nearly
doubled the amount of fresh water being dumped into the ocean in only
five years.

"I think what's going to happen in the future is a continued
acceleration of sea level rise," Bindschadler said. "The rate is going
to increase and the magnitude is going to increase. And that's what
alarms me about this."

Bindschadler said he is working to better understand the processes at
work so that scientists can better predict what will happen with some
degree of certainty.

"But this does not comfort me in my view of the future," he said.
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