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Arctic methane sources: Isotopic evidence for atmospheric inputs

Fisher, R.E., Sriskantharajah, S., Lowry, D., Lanoisellé, M., Fowler, C.M.R., James, R.H., Hermansen, O., Lund Myhre, C., Stohl, A., Greinert, J., Nisbet-Jones, P.B.R., Mienert, J. and Nisbet, E.G. (2011) Arctic methane sources: Isotopic evidence for atmospheric inputs Geophysical Research Letters, 38, (21), L21803. (doi:10.1029/2011GL049319).

Record type: Article

Abstract

By comparison of the methane mixing ratio and the carbon isotope ratio (?13CCH4) in Arctic air with regional background, the incremental input of CH4 in an air parcel and the source ?13CCH4 signature can be determined. Using this technique the bulk Arctic CH4 source signature of air arriving at Spitsbergen in late summer 2008 and 2009 was found to be ?68‰, indicative of the dominance of a biogenic CH4 source. This is close to the source signature of CH4 emissions from boreal wetlands. In spring, when wetland was frozen, the CH4 source signature was more enriched in 13C at ?53 ± 6‰ with air mass back trajectories indicating a large influence from gas field emissions in the Ob River region. Emissions of CH4 to the water column from the seabed on the Spitsbergen continental slope are occurring but none has yet been detected reaching the atmosphere. The measurements illustrate the significance of wetland emissions. Potentially, these may respond quickly and powerfully to meteorological variations and to sustained climate warming.

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Published date: 2011
Organisations: Marine Geoscience

Identifiers

Local EPrints ID: 204337
URI: http://eprints.soton.ac.uk/id/eprint/204337
ISSN: 0094-8276
PURE UUID: 8dd2c9a0-7081-46ae-946d-cd4bc1933e18

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Date deposited: 25 Nov 2011 09:36
Last modified: 18 Jul 2017 11:06

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Contributors

Author: R.E. Fisher
Author: S. Sriskantharajah
Author: D. Lowry
Author: M. Lanoisellé
Author: C.M.R. Fowler
Author: R.H. James
Author: O. Hermansen
Author: C. Lund Myhre
Author: A. Stohl
Author: J. Greinert
Author: P.B.R. Nisbet-Jones
Author: J. Mienert
Author: E.G. Nisbet

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