Jos jedan lednik,otpao sa Antartika

Jos jedan lednik,otpao sa Antartika

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A new iceberg about twice the size of Dallas broke off an Antarctic ice shelf, scientists said Friday.

The event is the latest in a series of breakups of the Larsen B ice shelf, which until recent years had endured several millennia without such major change. The breakup has coincided with warmer temperatures. The new iceberg is catalogued as A-53.

The latest event is separate from one in January in which the world's largest known iceberg ran aground in the Antarctic, snuggling up to a glacier known as the Drygalski Ice Tongue.

The new iceberg is about 16 by 35 nautical miles, according to the National Ice Center in Suitland, Md., which has monitored it with satellite images from the Canadian Space Agency. It broke off on Jan. 31.

"Some icebergs of similar size that have broken off from the Larsen Ice Shelf have remained in the area for a while, while others have journeyed north," said Sean Helfrich, a NOAA meteorologist at the National Ice Center. "A-53 likely will not leave the Weddell Sea this year, and may even break off into additional icebergs sometime this year."

Iceberg names are derived from the Antarctic quadrant where they are first sighted. A-53 is the 53rd iceberg the NIC has spotted in Antarctica in quadrant A, which includes the Bellinghausen/Weddell Sea region.

http://www.livescience.com/environment/050206_new_iceberg.html



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Jos jedan dokaz da ce biti vode u buducnosti i vise nego sto nam je potrebno...
Kad cujem nekoga da kaze: 21 vek ce biti vek ratova za vodu, samo prevrnem ocima Bebee Dol



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Samo da se ne pretera sa otapanjem antartika,inace ce nam "voda doci preko glave".

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Pa to i kazem.... Vec smo pricali o ovome Smile
Vraca se panonsko more... Eno Rumuni se podavise Smile

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A bogami i nasi,vec se pomalo dave(znam da smo o tome pricali).Mozda cemo mutirati pa cemo dobiti skrge za koji vek. :-) (ili sto kaze Radovan 3 "samo mi nosati smo preziveli").

Dopuna: 21 Jul 2005 13:03

A evo sta su nasli posle toga:

A strange ecosystem has been discovered beneath the Antarctic ice sheet. But the collapse of the ice shelf that allowed researchers to find it also threatens the community's future.

The Larsen ice shelf is on the Antarctic Peninsula, the northern tip of the continent, which reaches up towards South America. Possibly as a result of global warming, a 3,250-square-kilometre piece of ice, roughly the size of Long Island or Cornwall, broke away from the peninsula in 2002.

In March this year, researchers from the US Antarctic Program were surveying a patch of sea bed that used to be covered by this ice. The area lies 850 metres below the waves and 100 kilometres from where the tip of the ice shelf once started. The researchers took video and still images of the ocean floor using a submerged sled towed behind their boat. They weren't expecting, or looking for, signs of life.

But they found it. "Seeing these organisms on the ocean bottom... it's like lifting the carpet off the floor and finding a layer that you never knew was there," says Eugene Domack, a geoscientist at Hamilton College in Clinton, New York. "It was like Christmas morning when I was a child!"

The big seep

The pictures show a thick white mat covering the sea bed that resembles 'bacterial mats' seen in other unusual deep-sea communities and has gas bubbles rising from it. The video shows 'mud volcanoes' with large collections of clams clustered around them. The results appear today in Eos, the weekly newspaper of the American Geophysical Union1.

Domack and his colleagues think the site is an example of a cold seep: a deep-sea site where sulphur-rich waters and natural gas leak from the ocean floor. Mud volcanoes form where the waters well up. Thick mats of bacteria thrive on the gas and sulphur, using chemosynthesis to manufacture organic compounds. Similar communities exist at underwater hydrothermal vents, where sulphur-rich waters are volcanically superheated.

The discovery is significant because no seeps have been found at such a latitude before. It may be that there are many more such sites beneath the vast areas of sea covered by ice sheets. "The area beneath ice shelves is large and very, very poorly known," says Domack.

Gateway to the south

Alex Rogers, a biodiversity expert at the British Antarctic Survey in Cambridge, UK, says the discovery could be the missing piece of a puzzle that has stumped scientists studying cold seeps and other chemosynthetic systems.

Sites in different oceans often host the same species, Rogers says, but it has not been clear how the fauna could travel the thousands of miles between the very specialized habitats they need.

"The Southern Ocean forms a natural gateway between all the other oceans," explains Rogers. "If more seeps occurred in the Southern Ocean it could be acting as a dispersal route to sites in other seas."



But the surprising ecosystem's days could be numbered. The overlying ice shelf sheltered the site from physical disturbance and the organic debris that usually supports bottom-dwelling organisms. Now sediment and rocks are building up, and more usual Antarctic species are moving in.

"It could be a decade or less before the sites are buried," says Domack. He says the bacterial mats show definite signs of decline, as species move in to feed on the accumulating organic matter and discover a tasty food source.

If predators of these grazers follow, then the clams and many other species unique to the site could start to disappear.

http://www.nature.com/news/2005/050718/full/050718-5.html

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  • SSpin 
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Leggy i ja mislim da ce biti vek ratova za vodom, jer nece svi imati taj luksuz da piju tu vodu koja se otapa Wink Ta voda sa Antarktika nije za pice, i moze se iskoristiti u neke druge svrhe.
Npr. sto se tice Srbije, naucnici kazu da ce za 50 godina ona imati klimu juzne Grcke, ali..... grci imaju more a mi Razz Razz tako da ce i kad nas biti qqlele za tih 50 god Wink

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Za zivot covek(pojedinca) to je veliki vremenski period,a ta voda sa Antartika se moze obraditi u vodu za pice(jel da)?.

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@SSpin

Ta voda kad se otopi mora negde da ode, pre svega da ispari, tako da ce pre ovde klima biti tropska, sa monsunima, znaci puno kisa.

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Ne ovde ne previdjaju tako nesto.Ima logike to sto govoris, normalno je da ako ima isparavanja padaju kise....ali klimatologija mi nije jaca strana pa ti ne znam bas objasniti do detalja, ali ovde sigurno ne predvidjaju tropsku klimu sa kisama Wink

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