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Politics : The Environmentalist Thread
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To: Wharf Rat who wrote (9310)2/5/2007 5:01:00 PM
From: Wharf Rat  Read Replies (1) of 36917
 
Methane now bubbling from Beaufort Sea
CK Paull, W Ussler, SR Dallimore, SM Blasco, TD Lorenson, H Melling, BE Medioli, FM Nixon, FA McLaughlin, American Geophysical Union
The Arctic shelf is currently undergoing dramatic thermal changes caused by the continued warming associated with Holocene sea level rise.

During this transgression, comparatively warm waters have flooded over cold permafrost areas of the Arctic Shelf. A thermal pulse of more than 10°C is still propagating down into the submerged sediment and may be decomposing gas hydrate as well as permafrost.

A search for gas venting on the Arctic seafloor focused on pingo-like-features (PLFs) on the Beaufort Sea Shelf because they may be a direct consequence of gas hydrate decomposition at depth. Vibracores collected from eight PLFs had systematically elevated methane concentrations. ROV observations revealed streams of methane-rich gas bubbles coming from the crests of PLFs. We offer a scenario of how PLFs may be growing offshore as a result of gas pressure associated with gas hydrate decomposition.
(5 Jan 2007)
The AGU paper above costs $9, but there is this 8min Canadian Broadcasting Commission interview with co-author Scott Dallimore (4MB mp3).

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