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Methane fluxes from the sea to the atmosphere across the Siberian shelf seas
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
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Number of Authors: 5
2016 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 43, no 11, 5869-5877 p.Article in journal (Refereed) Published
Abstract [en]

The Laptev and East Siberian Seas have been proposed as a substantial source of methane (CH4) to the atmosphere. During summer 2014, we made unique high-resolution simultaneous measurements of CH4 in the atmosphere above, and surface waters of, the Laptev and East Siberian Seas. Turbulence-driven sea-air fluxes along the ship's track were derived from these observations; an average diffusive flux of 2.99mgm(-2) d(-1) was calculated for the Laptev Sea and for the ice-free portions of the western East Siberian Sea, 3.80mgm(-2)d(-1). Although seafloor bubble plumes were observed at two locations in the study area, our calculations suggest that regionally, turbulence-driven diffusive flux alone accounts for the observed atmospheric CH4 enhancements, with only a local, limited role for bubble fluxes, in contrast to earlier reports. CH4 in subice seawater in certain areas suggests that a short-lived flux also occurs annually at ice-out.

Place, publisher, year, edition, pages
2016. Vol. 43, no 11, 5869-5877 p.
Keyword [en]
Arctic, methane, Laptev Sea, East Siberian Sea, methane flux
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-133242DOI: 10.1002/2016GL068977ISI: 000379851800039OAI: oai:DiVA.org:su-133242DiVA: diva2:963030
Available from: 2016-09-07 Created: 2016-09-05 Last updated: 2016-09-07Bibliographically approved

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Thornton, Brett F.Geibel, Marc C.Crill, Patrick M.Humborg, ChristophMörth, Carl-Magnus
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Department of Geological SciencesDepartment of Environmental Science and Analytical Chemistry
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Geophysical Research Letters
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