Shock: Arctic sea ice releases deadly greenhouse gas
The scale and quantity of the methane release has astonished the head of the Russian research staff who has been surveying the seabed of the East Siberian Arctic Shelf off northern Russia for virtually twenty years.
In an distinctive job interview with The Independent, Igor Semiletov, of the Far Eastern department of the Russian Academy of Sciences, explained that he has in no way before witnessed the scale and force of the methane getting introduced from beneath the Arctic seabed.
"Previously we located torch-like constructions like this but they have been only tens of metres in diameter. This is the very first time that we have identified constant, powerful and extraordinary seeping constructions, more than 1,000 metres in diameter. It is wonderful," Dr Semiletov mentioned. "I was most amazed by the sheer scale and large density of the plumes. Over a fairly little location we found a lot more than 100, but over a wider location there should be thousands of them."
Researchers estimate that there are hundreds of hundreds of thousands of tonnes of methane gas locked absent beneath the Arctic permafrost, which extends from the mainland into the seabed of the reasonably shallow sea of the East Siberian Arctic Shelf. One of the greatest fears is that with the disappearance of the Arctic sea-ice in summer season, and quickly increasing temperatures throughout the entire area, which are presently melting the Siberian permafrost, the trapped methane could be quickly produced into the atmosphere major to quick and extreme climate adjust.
Dr Semiletov's team posted a study in 2010 estimating that the methane emissions from this region had been about eight million tonnes a year, but the latest expedition indicates this is a important underestimate of the phenomenon.
In late summertime, the Russian research vessel Academician Lavrentiev conducted an considerable survey of about 10,000 sq. miles of sea off the East Siberian coastline. Scientists deployed four highly sensitive instruments, each seismic and acoustic, to keep an eye on the "fountains" or plumes of methane bubbles climbing to the sea surface from beneath the seabed.
"In a extremely small place, less than 10,000 square miles, we have counted far more than 100 fountains, or torch-like structures, bubbling through the h2o column and injected right into the environment from the seabed," Dr Semiletov explained. "We carried out checks at about one hundred fifteen stationary points and learned methane fields of a great scale – I feel on a scale not observed ahead of. Some plumes were a kilometre or more vast and the emissions went straight into the atmosphere – the focus was a hundred times higher than typical."
Dr Semiletov introduced his findings for the initial time last week at the American Geophysical Union meeting in San Francisco.
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Post subject: Retreat of Arctic sea ice releases deadly methane deposits Posted: Sun Dec 18, 2011 7:19 pm Conspirator Joined: Sat Oct 18, 2008 9:57 pm Posts: 2871 Location: Scotland Dramatic and unprecedented plumes of methane - a greenhouse gas 20 times more potent than carbon dioxide - have been seen bubbling to the surface of the Arctic...
( via independent.co.uk )
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