Wednesday, December 21, 2011
Huge Methane Plumes in Siberian Arctic
Linking this to anything is premature. We do not know if this is even a new event. Besides, a reduction in the sea ice should have no impact deep in the ocean bed itself. Even a noticeably warmer layer of surface water should have no effect. The heat has to pass through the permafrost to get anywhere bedsides.
The hemisphere has warmed over the past half century and a range of effects have been observed. Yet I am loath to include this effect as even a part of the observed warming.
Again methane is singled out as a greenhouse gas which is technically true but practically this is not so as the gas rises swiftly out of the lower atmosphere.
Shock as retreat of Arctic sea ice releases deadly greenhouse gas
Russian research team astonished after finding 'fountains' of methane bubbling to surface
TUESDAY 13 DECEMBER 2011
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 Ocean by scientists undertaking
an extensive survey of the region.
The scale and volume of the methane release has astonished the head of the Russian research team who has been surveying the seabed of the East Siberian Arctic Shelf off northern
for nearly 20 years. Russia
In an exclusive interview with The Independent, Igor Semiletov, of the Far Eastern branch of the
of Sciences, said
that he has never before witnessed the scale and force of the methane being
released from beneath the Arctic seabed. Russian
"Earlier we found torch-like structures like this but they were only tens of metres in diameter. This is the first time that we've found continuous, powerful and impressive seeping structures, more than 1,000 metres in diameter. It's amazing," Dr Semiletov said. "I was most impressed by the sheer scale and high density of the plumes. Over a relatively small area we found more than 100, but over a wider area there should be thousands of them."
Scientists estimate that there are hundreds of millions of tonnes of methane gas locked away beneath the Arctic permafrost, which extends from the mainland into the seabed of the relatively 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, and rapidly rising temperatures across the entire region, which are already melting the Siberian permafrost, the trapped methane could be suddenly released into the atmosphere leading to rapid and severe climate change.
Dr Semiletov's team published a study in 2010 estimating that the methane emissions from this region were about eight million tonnes a year, but the latest expedition suggests this is a significant underestimate of the phenomenon.
In late summer, the Russian research vessel Academician Lavrentiev conducted an extensive survey of about 10,000 square miles of sea off the East Siberian coast. Scientists deployed four highly sensitive instruments, both seismic and acoustic, to monitor the "fountains" or plumes of methane bubbles rising to the sea surface from beneath the seabed.
"In a very small area, less than 10,000 square miles, we have counted more than 100 fountains, or torch-like structures, bubbling through the water column and injected directly into the atmosphere from the seabed," Dr Semiletov said. "We carried out checks at about 115 stationary points and discovered methane fields of a fantastic scale – I think on a scale not seen before. Some plumes were a kilometre or more wide and the emissions went directly into the atmosphere – the concentration was a hundred times higher than normal."
Dr Semiletov released his findings for the first time last week at the American Geophysical Union meeting in