Methane under permafrost could speed up global warming 20-foldSeptember 3rd, 2009 - 2:40 pm ICT by IANS
Washington, Sep 3 (IANS) Melting permafrost in arctic regions, triggered by global warming, will release underground methane. Once released, methane would speed up global warming by trapping the earth’s heat radiation about 20 times more efficiently than the greenhouse gas, carbon dioxide.
An MIT paper concludes that methane deposits trapped under ocean may already be escaping through vents in the sea floor at a much faster rate than previously believed.
Some scientists have associated the release, both gradual and fast, of subsurface ocean methane with climate change of the past and future.
“The sediment conditions under which this mechanism for gas migration dominates, such as when you have a very fine-grained mud, are pervasive in much of the ocean as well as in some permafrost regions,” said study co-author Ruben Juanes.
Juanes, MIT assistant professor in energy studies in civil and environmental engineering added that “this indicates that we may be greatly underestimating the methane fluxes presently occurring in the ocean and from underground into earth’s atmosphere”.
“This could have implications for our understanding of the earth’s carbon cycle and global warming.” Juanes explained that some of the naturally occurring underground methane exists not as gas but as methane hydrate,” said an MIT release.
In the hydrate phase, a methane gas molecule is locked inside a crystalline cage of frozen water molecules. Methane hydrates will remain stable as long as the external pressure remains high and the temperature low.
These findings appeared in the online version of the Journal of Geophysical Research.
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- Freshwater methane emission changes greenhouse gas equation - Jan 07, 2011
- Heating of Arctic current contributes to global warming - Aug 16, 2009
- Methane leak from Arctic Shelf may be much larger and faster than anticipated - Mar 05, 2010
- Arctic lands and oceans account for 25 percent of world's net sink of CO2 - Oct 15, 2009
- International expedition investigates climate change in Arctic - Nov 22, 2009
- Two thirds of permafrost likely to melt by 2200 - Feb 17, 2011
- Arctic area, oceans lock up fourth of world's carbon dioxide - Oct 15, 2009
- Climate change strips Arctic of much snow cover - May 05, 2011
- Dams the latest culprit in global warming - Aug 08, 2012
- Abrupt thaw in permafrost heightens climatic threat - Dec 04, 2011
- Global warming was 'more common 50m yrs ago' - Mar 17, 2011
- Natural gas supplies could be augmented with methane hydrate - Jan 30, 2010
Tags: arctic regions, carbon cycle, climate change, energy studies, frozen water, gas carbon dioxide, gas migration, gas molecule, global warming, greenhouse gas, heat radiation, journal of geophysical research, juanes, melting permafrost, methane gas, methane hydrates, permafrost regions, sea floor, subsurface ocean, water molecules