Extensive release of methane from Arctic seabed west of Svalbard during summer 2014 does not influence the atmosphere

Lund Myhre, C., Ferré, B., Platt, S. M., Silyakova, A., Hermansen, O., Allen, G., Pisso, I., Schmidbauer, N., Stohl, A., Pitt, J., Jansson, P., Greinert, Jens, Percival, C., Fjaeraa, A. M., O'Shea, S., Gallagher, M., Le Breton, M., Bower, K., Bauguitte, S., Dalsøren, S., Vadakkepuliyambatta, S., Fisher, R. E., Nisbet, E.G., Lowry, D., Myhre, G., Pyle, J., Cain, M. and Mienert, J. (2016) Extensive release of methane from Arctic seabed west of Svalbard during summer 2014 does not influence the atmosphere Geophysical Research Letters, 43 (9). pp. 4624-4631. DOI 10.1002/2016GL068999.

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Supplementary data:

Abstract

We find that summer methane (CH4) release from seabed sediments west of Svalbard substantially increases CH4 concentrations in the ocean but has limited influence on the atmospheric CH4 levels. Our conclusion stems from complementary measurements at the seafloor, in the ocean, and in the atmosphere from land-based, ship and aircraft platforms during a summer campaign in 2014. We detected high concentrations of dissolved CH4 in the ocean above the seafloor with a sharp decrease above the pycnocline. Model approaches taking potential CH4 emissions from both dissolved and bubble-released CH4 from a larger region into account reveal a maximum flux compatible with the observed atmospheric CH4 mixing ratios of 2.4–3.8 nmol m−2 s−1. This is too low to have an impact on the atmospheric summer CH4 budget in the year 2014. Long-term ocean observatories may shed light on the complex variations of Arctic CH4 cycles throughout the year.

Document Type: Article
Additional Information: WOS:000378339200066
Keywords: methane; Arctic; ocean; atmosphere; climate
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems > DeepSea Monitoring
Kiel University
Refereed: Yes
DOI etc.: 10.1002/2016GL068999
ISSN: 0094-8276
Related URLs:
Projects: MOCA, MAMM, ACCI
Contribution Number:
ProjectNumber
["eprint_fieldopt_contribution_number_project_DSM" not defined]14
Date Deposited: 13 May 2016 08:44
Last Modified: 15 Sep 2017 08:21
URI: http://eprints.uni-kiel.de/id/eprint/32872

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