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Science/Tech
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Title: NASA Data: Greenland, Antarctic Ice Melt Worsening
Source: Associated Press
URL Source: http://www.sfgate.com/cgi-bin/artic ... /09/23/national/w100100D80.DTL
Published: Sep 23, 2009
Author: Associated Press
Post Date: 2009-09-23 14:10:34 by Brian S
Keywords: None
Views: 522
Comments: 33

(09-23) 10:01 PDT WASHINGTON, (AP) --

New satellite information shows that ice sheets in Greenland and western Antarctica continue to shrink faster than scientists thought and in some places are already in runaway melt mode.

British scientists for the first time calculated changes in the height of the vulnerable but massive ice sheets and found them especially worse at their edges. That's where warmer water eats away from below. In some parts of Antarctica, ice sheets have been losing 30 feet a year in thickness since 2003, according to a paper published online Thursday in the journal Nature.

Some of those areas are about a mile thick, so they've still got plenty of ice to burn through. But the drop in thickness is speeding up. In parts of Antarctica, the yearly rate of thinning from 2003 to 2007 is 50 percent higher than it was from 1995 to 2003.

These new measurements, based on 50 million laser readings from a NASA satellite, confirm what some of the more pessimistic scientists thought: The melting along the crucial edges of the two major ice sheets is accelerating and is in a self-feeding loop. The more the ice melts, the more water surrounds and eats away at the remaining ice.

"To some extent it's a runaway effect. The question is how far will it run?" said the study's lead author, Hamish Pritchard of the British Antarctic Survey. "It's more widespread than we previously thought."

The study doesn't answer the crucial question of how much this worsening melt will add to projections of sea level rise from man-made global warming. Some scientists have previously estimated that steady melting of the two ice sheets will add about 3 feet, maybe more, to sea levels by the end of the century. But the ice sheets are so big it would probably take hundreds of years for them to completely disappear.

As scientists watch ice shelves retreat or just plain collapse, some thought the problem could slow or be temporary. The latest measurements eliminate "the most optimistic view," said Penn State University professor Richard Alley, who wasn't part of the study.

The research found that 81 of the 111 Greenland glaciers surveyed are thinning at an accelerating, self-feeding pace.

The key problem is not heat in the air, but the water near the ice sheets, Pritchard said. The water is not just warmer but its circulation is also adding to the melt.

"It is alarming," said Jason Box of Ohio State University, who also wasn't part of the study.

Worsening data, including this report, keep proving "that we're underestimating" how sensitive the ice sheets are to changes, he said.

___

On the Net

Nature: www.nature.com/

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Begin Trace Mode for Comment # 6.

#2. To: Brian S (#0) (Edited)

Newly discovered volcanoes located under both, one has even punched through the Antarctic ice sheet. If we could only get those durn things to turn off.

You know it's propaganda when it discusses areas literally created by still active vulcanism, and volcanoes aren't mentioned once in the article.

mininggold  posted on  2009-09-23   14:27:45 ET  Reply   Untrace   Trace   Private Reply  


#6. To: mininggold, Brian S, SonOfLiberty (#2)

The ice sheet down in Antarctica that broke up recently is in a horseshoe shaped bay. That glacier can't calve the way they are supposed to. Pressure from behind causes it to shatter like glass, see the satellite photos, and then the pieces float off. It happens all the time and has nothing to do with AGW. Or so I'm told by me glaciologist friends.

farmfriend  posted on  2009-09-23   14:48:33 ET  Reply   Untrace   Trace   Private Reply  


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