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Methane fluxes from the sea to the atmosphere across the Siberian shelf seas
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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
AMER GEOPHYSICAL UNION , 2016. Vol. 43, no 11, 5869-5877 p.
Keyword [en]
Arctic; methane; Laptev Sea; East Siberian Sea; methane flux
National Category
Natural Sciences
Research subject
SWEDARCTIC 2014, SWERUS-C3
Identifiers
URN: urn:nbn:se:polar:diva-3745DOI: 10.1002/2016GL068977OAI: oai:DiVA.org:polar-3745DiVA: diva2:1120932
Available from: 2017-07-07 Created: 2017-07-07 Last updated: 2017-07-07

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