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Limited contribution of ancient methane to surface waters of the U.S. Beaufort Sea shelf
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry. University of Rochester, USA.
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Number of Authors: 92018 (English)In: Science Advances, ISSN 0036-8156, E-ISSN 2375-2548, Vol. 4, no 1, article id eaao4842Article in journal (Refereed) Published
Abstract [en]

In response to warming climate, methane can be released to Arctic Ocean sediment and waters from thawing subsea permafrost and decomposing methane hydrates. However, it is unknown whether methane derived from this sediment storehouse of frozen ancient carbon reaches the atmosphere. We quantified the fraction of methane derived fromancient sources in shelf waters of the U.S. Beaufort Sea, a region that has both permafrost andmethane hydrates and is experiencing significant warming. Although the radiocarbon-methane analyses indicate that ancient carbon is being mobilized and emitted as methane into shelf bottom waters, surprisingly, we find that methane in surface waters is principally derived from modern-aged carbon. We report that at and beyond approximately the 30-m isobath, ancient sources that dominate in deep waters contribute, at most, 10 +/- 3% of the surface water methane. These results suggest that even if there is a heightened liberation of ancient carbon-sourced methane as climate change proceeds, oceanic oxidation and dispersion processes can strongly limit its emission to the atmosphere.

Place, publisher, year, edition, pages
2018. Vol. 4, no 1, article id eaao4842
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Earth and Related Environmental Sciences
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URN: urn:nbn:se:su:diva-154668DOI: 10.1126/sciadv.aao4842ISI: 000426694200042OAI: oai:DiVA.org:su-154668DiVA, id: diva2:1201435
Available from: 2018-04-25 Created: 2018-04-25 Last updated: 2018-04-25Bibliographically approved

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Sparrow, Katy J.
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