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Strong atmospheric chemistry feedback to climate warming from Arctic methane emissions

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dc.contributor.author Isaksen, Ivar S. A.
dc.contributor.author Gauss, Michael
dc.contributor.author Myhre, Gunnar
dc.contributor.author Walter Anthony, Katey M.
dc.contributor.author Ruppel, Carolyn D.
dc.date.accessioned 2011-05-09T18:39:48Z
dc.date.available 2011-10-20T08:28:28Z
dc.date.issued 2011-04-20
dc.identifier.citation Global Biogeochemical Cycles 25 (2011): GB2002 en_US
dc.identifier.uri http://hdl.handle.net/1912/4553
dc.description Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 25 (2011): GB2002, doi:10.1029/2010GB003845. en_US
dc.description.abstract The magnitude and feedbacks of future methane release from the Arctic region are unknown. Despite limited documentation of potential future releases associated with thawing permafrost and degassing methane hydrates, the large potential for future methane releases calls for improved understanding of the interaction of a changing climate with processes in the Arctic and chemical feedbacks in the atmosphere. Here we apply a “state of the art” atmospheric chemistry transport model to show that large emissions of CH 4 would likely have an unexpectedly large impact on the chemical composition of the atmosphere and on radiative forcing (RF). The indirect contribution to RF of additional methane emission is particularly important. It is shown that if global methane emissions were to increase by factors of 2.5 and 5.2 above current emissions, the indirect contributions to RF would be about 250% and 400%, respectively, of the RF that can be attributed to directly emitted methane alone. Assuming several hypothetical scenarios of CH 4 release associated with permafrost thaw, shallow marine hydrate degassing, and submarine landslides, we find a strong positive feedback on RF through atmospheric chemistry. In particular, the impact of CH 4 is enhanced through increase of its lifetime, and of atmospheric abundances of ozone, stratospheric water vapor, and CO 2 as a result of atmospheric chemical processes. Despite uncertainties in emission scenarios, our results provide a better understanding of the feedbacks in the atmospheric chemistry that would amplify climate warming. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2010GB003845
dc.subject Methane en_US
dc.subject Permafrost en_US
dc.subject Radiative forcing en_US
dc.title Strong atmospheric chemistry feedback to climate warming from Arctic methane emissions en_US
dc.type Article en_US
dc.identifier.doi 10.1029/2010GB003845


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