Articles | Volume 14, issue 9
Biogeosciences, 14, 2283–2292, 2017
https://doi.org/10.5194/bg-14-2283-2017

Special issue: Climate–carbon–cryosphere interactions in the...

Biogeosciences, 14, 2283–2292, 2017
https://doi.org/10.5194/bg-14-2283-2017

Research article 05 May 2017

Research article | 05 May 2017

The origin of methane in the East Siberian Arctic Shelf unraveled with triple isotope analysis

Célia J. Sapart et al.

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Cited articles

Bauch, H. A., Mueller-Lupp, T., Taldenkova, E., Spielhagen, R. F., Kassens, H., Grootes, P. M., Thiede, J., Heinemeier, J., and Petryashov, V. V.: Chronology of the Holocene transgression at the North Siberian margin, Global Planet. Change, 31, 125–139, 2001.
Brass, M. and Röckmann, T.: Continuous-flow isotope ratio mass spectrometry method for carbon and hydrogen isotope measurements on atmospheric methane, Atmos. Meas. Tech., 3, 1707–1721, https://doi.org/10.5194/amt-3-1707-2010, 2010.
Bröder, L., Tesi, T., Andersson, A., Eglinton T. I., Semiletov, I. P., Dudarev, O. V., Roos, P., and Gustafsson, Ö.: Historical records of organic matter supply and degradation status in the East Siberian Sea, Org. Geochem., 91, 16–30, 2016.
Brosius, L. S., Walter Anthony, K. M., Grosse, G., Chanton, J. P., Farquharson, L. M., Overduin, P. P., and Meyer, H.: Using the deuterium isotope composition of permafrost meltwater to constrain thermokarst lake contributions to atmospheric CH4 during the last deglaciation, J. Geophys. Res., 117, G01022, https://doi.org/10.1029/2011JG001810, 2012.
Bussmann, I.: Distribution of methane in the Lena Delta and Buor-Khaya Bay, Russia, Biogeosciences, 10, 4641–4652, https://doi.org/10.5194/bg-10-4641-2013, 2013.
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Short summary
The Arctic Ocean, especially the Siberian shelves, overlays large areas of subsea permafrost that is degrading. We show that methane with a biogenic origin is emitted from this permafrost. At locations where bubble plumes have been observed, methane can escape oxidation in the surface sediment and rapidly migrate through the very shallow water column of this region to escape to the atmosphere, generating a positive radiative feedback.
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