Methane fluxes from the sea to the atmosphere across the Siberian shelf seas
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
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.
Arctic, methane, Laptev Sea, East Siberian Sea, methane flux
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:su:diva-133242DOI: 10.1002/2016GL068977ISI: 000379851800039OAI: oai:DiVA.org:su-133242DiVA: diva2:963030