Limited contribution of ancient methane to surface waters of the u.S. Beaufort sea shelf

Katy J. Sparrow, John D. Kessler, John R. Southon, Fenix Garcia-Tigreros, Kathryn M. Schreiner, Carolyn D. Ruppel, John B. Miller, Scott J. Lehman, Xiaomei Xu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

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 from ancient sources in shelf waters of the U.S. Beaufort Sea, a region that has both permafrost and methane 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.

Original languageEnglish (US)
Article numbereaao4842
JournalScience Advances
Volume4
Issue number1
DOIs
StatePublished - Jan 1 2018

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Methane
Oceans and Seas
Water
Carbon
Atmosphere
Climate Change
Climate

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Sparrow, K. J., Kessler, J. D., Southon, J. R., Garcia-Tigreros, F., Schreiner, K. M., Ruppel, C. D., ... Xu, X. (2018). Limited contribution of ancient methane to surface waters of the u.S. Beaufort sea shelf. Science Advances, 4(1), [eaao4842]. https://doi.org/10.1126/sciadv.aao4842

Limited contribution of ancient methane to surface waters of the u.S. Beaufort sea shelf. / Sparrow, Katy J.; Kessler, John D.; Southon, John R.; Garcia-Tigreros, Fenix; Schreiner, Kathryn M.; Ruppel, Carolyn D.; Miller, John B.; Lehman, Scott J.; Xu, Xiaomei.

In: Science Advances, Vol. 4, No. 1, eaao4842, 01.01.2018.

Research output: Contribution to journalArticle

Sparrow, KJ, Kessler, JD, Southon, JR, Garcia-Tigreros, F, Schreiner, KM, Ruppel, CD, Miller, JB, Lehman, SJ & Xu, X 2018, 'Limited contribution of ancient methane to surface waters of the u.S. Beaufort sea shelf', Science Advances, vol. 4, no. 1, eaao4842. https://doi.org/10.1126/sciadv.aao4842
Sparrow, Katy J. ; Kessler, John D. ; Southon, John R. ; Garcia-Tigreros, Fenix ; Schreiner, Kathryn M. ; Ruppel, Carolyn D. ; Miller, John B. ; Lehman, Scott J. ; Xu, Xiaomei. / Limited contribution of ancient methane to surface waters of the u.S. Beaufort sea shelf. In: Science Advances. 2018 ; Vol. 4, No. 1.
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