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Antarctic may host methane stores

RATE THIS! +1
Posted in Science on 29th Aug, 2012 09:25 PM by AlexMuller

It says this methane could be released into the atmosphere as ice retreats, contributing to climate warming.

 

The findings indicate that ancient deposits of organic matter may have been converted to methane by microbes under the ice.

Study leader Jemima Wadham, from Bristol University, said: "This is an immense amount of organic carbon, more than ten times the size of carbon stocks in northern permafrost regions. "Our laboratory experiments tell us that these sub-ice environments are also biologically active, meaning that this organic carbon is probably being metabolised to carbon dioxide and methane gas by microbes."

 

They estimate that there could be hundreds of billions of tonnes of carbon stored in methane reservoirs under the ice sheet. The authors say that the predicted shallow depth of these methane reserves means that they could be destabilised by climate change, and might act as a positive feedback on global warming.

 

Co-author Dr Sandra Arndt, also from the University of Bristol, said: "It's not surprising that you might expect to find significant amounts of methane hydrate trapped beneath the ice sheet.

 

"Just like in sub-seafloor sediments, it is cold and pressures are high which are important conditions for methane hydrate formation."

 

In their Nature paper, the authors comment that their "findings suggest that the Antarctic Ice Sheet may be a neglected but important component of the global methane budget".
 



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