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Arctic's Thick-Ice Areas Diminishing

By Dan Vergano
,
USA Today
posted: 21 HOURS 38 MINUTES AGO
comments: 402
filed under: Science News
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(April 7) -- Satellite measurements indicate the Arctic Ocean is on thin ice, NASA reported Monday.
The Arctic's reserve of thick ice that's more than 2 years old makes up 10% of its winter ice cover, compared with 40% in previous decades, according to data from NASA's Ice, Cloud and Land Elevation Satellite.
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The finding continues a decade of measured declines in the expanse of winter sea ice, which scientists attribute to global warming. "We don't have to wait to see the (warming) impacts in the Arctic, they are already happening," says scientist Walter Meier of the University of Colorado-Boulder.
Over three decades of satellite monitoring, the past six years have brought the smallest measurements of winter ice cover over the Arctic Ocean. Winter ice peaked this year on Feb. 28 at 5.85 million square miles, the fifth-smallest measured area. That's a loss roughly the size of Texas, about 278,000 square miles, from the average annual acreage of winter sea ice from 1979 to 2009.
In 2007, the Intergovernmental Panel on Climate Change concluded that global average temperatures would likely rise 3 to 7 degrees Fahrenheit by the end of the century, and that most summer sea ice would be gone in the Arctic. The new satellite findings substantiate other measurements that indicate the ice is melting faster than that.
"The satellites' analysis gives us a lot more precision and understanding of what is going on beneath the surface in the Arctic," says researcher James Overland of the National Oceanic and Atmospheric Administration. He was not part of the study.
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The researchers say the ice declines raise concerns:
- Many species of polar animals live on and around the ice.
- The ice reflects sunlight absorbed as heat by open waters, which would amplify warming.
- The ice cover moderates temperatures across the Northern Hemisphere.
NASA spokesman Steve Cole noted that declining ice would open shipping lanes and mineral resources and could raise national security issues by eliminating the barrier of impassable ice between competing nations.
The satellite ice-thickness study, led by Ron Kwok of NASA's Jet Propulsion Laboratory in Pasadena, Calif., calculated that the entire volume of Arctic sea ice is enough water to fill Lake Superior and Lake Michigan combined.
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Copyright 2009 USA TODAY, a division of Gannett Co. Inc. All Rights Reserved.
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2009-04-07 09:19:13
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EARLYBRO

06:48 AMApr 08 2009

They are trying to sell this pipe dream on the world and I for one know there is no warming that is more then any other time in the history of the world.

AVG RATING:
(1)

Wildwudy

01:40 AMApr 08 2009

Does sea/ocean/salt water freeze? Of course it does. The freezing point of salt water varies depending on how much salt is in the water. For example, water that is 3500 parts per million salt (avg. amount in seawater) will freeze around -2 degrees celsius (28 degrees F). Water with an extreme amount of salt in it, like in some lake waters in Death Valley CA, with 300,000 ppm, will freeze at -20 to -30 degrees C (-4 to -20 degrees F). So Arctic ocean water does freeze easily. Howwever, it is now, for the first time in a long time, failing to freeze in the summer on Alaska's west shore during the summer, and is washing the beaches (and villages) away.

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(1)

Gardeningatnite

11:04 PMApr 08 2009

The Sun is feeding, and is getting hotter, and therefor so are we, getting hotter........thanx for the info! Perhaps, you could explain that if indeed; sunspots were responsibile, than both the upper and lower atmosphere would have warmed? When, in fact; only the the temperature of the lower atmosphere is warming?

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(1)

Gardeningatnite

10:49 PMApr 08 2009

The reason has to do with the behavior of ocean water when it freezes.When salt water freezes, much of the salt is expelled from the ice or getstrapped in pockets of salty liquid water within the ice. Eventually, most ofthe salt makes its way into the water just under the ice. This creates a layerof water under the ice that is saltier than the water below it. Because thislayer of cold salty water is very dense, it sinks to the bottom levels of theocean. As it sinks, it is replaced by water that is either warmer, less salty, orboth. As ice continues to form, expelling more salt into the surface waters,this new layer of water in turn becomes saltier and it begins to sink, too. Inthis way, water circulates under the sea ice in a cycle that lasts the entireAntarctic winter........................Isn't nature amazing? And, aren't you facts silly?

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Gardeningatnite

10:45 PMApr 08 2009

The Artic Ice is NOT freshwater, for those who say it is. Salt water freezes at a lower temperature than fresh but it does freeze. The snow on top of the frozen salt water is fresh. But I have seen the ocean freeze and it is not fresh water...............Whatever! A rather moot point, yes, eventually salt water does freeze! the majority of artic ice is freshwater!..............so tell us more about glaciers!

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(3)

Handydude6

10:39 PMApr 08 2009

The Artic Ice is NOT freshwater, for those who say it is. Salt water freezes at a lower temperature than fresh but it does freeze. The snow on top of the frozen salt water is fresh. But I have seen the ocean freeze and it is not fresh water.

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(1)

Handydude6

10:31 PMApr 08 2009

Aol must be on the side of the Globalist agenda. Nowhere do they ever give in to the possibility that this warming; may just be the Sun getting warmer. As the Sun moves through space it collects debris in varying amounts. Sometimes little debris is collected, so the Sun's atmosphere is cooler. But when there is lots of hydogen and other particles to inhale, the Sun heats up. A new theory of how the stars work is now presented. If the heat all came from the interior of the Stars, then it would make sense that the core would be the hottest place of a star. But the reverse is true. The hottest place of a star is it's atmosphere, and as they move through gaseous clouds, they heat up even hotter than when they are not moving through gas clouds. The Sun is feeding, and is getting hotter, and therefor so are we, getting hotter.

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Gardeningatnite

10:07 PMApr 08 2009

What about "Man On The Moon"? The video was awesome- and thought-provoking on so many levels.................this is true! I am not sure that a certain part of america can stand provoking thoughts! LOL! Just another brick in the wall!

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(1)

Gardeningatnite

10:06 PMApr 08 2009

What about "Man On The Moon"? The video was awesome- and thought-provoking on so many levels.................this is true! I am not sure that a ceratin part of america can stand provoking thoughts! LOL!

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Gardeningatnite

10:03 PMApr 08 2009

The Arctic ice (freshwater) has a higher density than does saltwater. Should it melt too rapidly all that cold, freshwater will pour into the North Atlantic between Canada and Greenland and cool and disrupt the Gulf Stream. That would SEVERELY alter the climate of the UK, most of Northern Europe and Russia. It would, in fact, be a precurser to ice age-like conditions, if not an actual ice age. The Northeast U.S. would be similarly effected. And that's just in the short term. I wish people would put aside their ideologies and read the science...............Exactly! And the (stale) arguements are getting old!

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