DanG
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Methane frozen beneath Arctic seabed destabilising
| Quote From Source: | Huge quantities of methane below the Arctic seabed are showing signs of destabilising, according to research conducted in the East Siberian Sea.
Scientists aboard Russian icebreakers have discovered that methane is leaking from the sub-sea permafrost far faster than had been previously estimated, raising concerns that climatic tipping points may have been reached.
As a greenhouse gas, methane is 25 times more powerful than carbon dioxide but emissions from subsea permafrost are not included in climate change prediction models.
“The sub-sea permafrost should act as a cap or seal, preventing leakage,” Natalia Shakhova, of the University of Alaska, told The Times. “Beneath it there is methane that has accumulated at high pressure. But the permafrost is losing its ability to be an impermeable cap.”
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http://www.timesonline.co.uk...vironment/article7050312.ece
well - this could be a real doom scenario ...
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DanG
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more doom ...
| Quote From Source: | Methane Is Gushing From a Russian Ice Shelf
The study said about 8 million tonnes of methane a year, equivalent to the annual total previously estimated from all of the world's oceans, were seeping from vast stores long trapped under permafrost [Reuters]. Study leader Natalia Shakhova says methane levels in the Arctic haven't been this high in 400,000 years. While we're not about to teeter off a cliff—that 8 million tons is a small portion of the global emissions of 440 million tons—we should be concerned, the scientists say. Methane is a far more powerful greenhouse gas than carbon dioxide, absorbing at least 25 times more heat, NOAA says.
Most undersea methane oxidizes into CO2 as it enters the atmosphere, but Shakhova says the East Siberian Ice Shelf methane is too close to the surface for that to happen. As a result, she said, atmospheric levels of methane over the Arctic are 1.85 parts per million, almost three times as high as the global average of 0.6 or 0.7 parts per million. Concentrations over the shelf are 2 parts per million or higher [The New York Times].
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http://blogs.discovermagazin...ng-from-a-russian-ice-shelf/ |
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Indy
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Fortunately those numbers are so low they don't really matter.
"I think God gives us children so death won't come as such a disappointment." - Two and a Half Men |
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DanG
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oh but its nearly full on blind panic according to the 2nd article
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doppelganger
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Run for your lives!! |
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DanG
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DanG has attached this image:
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![[*]](/images/corporate/default_icon.gif){kind=icon}
posted on 3/4/2010 at 20:44
