The multiple sources and patterns of methane in North Sea waters

Rehder, Gregor, Keir, Robin, Suess, Erwin and Pohlmann, Thomas (1998) The multiple sources and patterns of methane in North Sea waters Aquatic Geochemistry, 4 . pp. 403-427. DOI 10.1023/A:1009644600833.

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The methane concentration in the atmosphere andsurface water was surveyed along 58° N acrossthe North Sea. In addition, the vertical methanedistribution in the water column was determined at sixstations along the transect. The methane contents ofthe surface water as well as in the water column wereextremely inhomogeneous. Input by freshwater fromriver discharge and injection of methane from thesediment were both observed. The survey continued fromthe western side of the North Sea to the Elbe Riverestuary. The Elbe River appears to have low methaneconcentrations compared to other European rivers, itsaverage input into the North Sea is estimated to be70 nmol s-1 of methane. Near 58° N,1°40' E, an abandoned drill site releases about 25 % ofthe North Sea's emission of methane to the atmosphere.The advective methane transport induced by watercirculation was assessed for May 16, 1994, using a 3-DNorth Sea circulation model. For the period of thissurvey, the North Sea's source strength foratmospheric methane is estimated using in situwind velocities. In comparison to the advectivetransport by the water circulation, the gas flux tothe atmosphere appears to be the dominant sink ofNorth Sea methane. This flux is estimated to bebetween 1500 · 106 mol a-1 and 3100 ·106mol a-1, depending on the relationbetween wind speed and gas transfer velocity

Document Type: Article
Keywords: methane; trace gases; North Sea; air-sea exchange
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry
OceanRep > Leibniz Institute of Marine Sciences
Refereed: No
DOI etc.: 10.1023/A:1009644600833
ISSN: 1380-6165
Projects: MAST
Date Deposited: 18 Feb 2008 17:24
Last Modified: 25 May 2016 12:18

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