Roemer, M., Torres, M., Kasten, S., Kuhn, G., Graham, A. G. C., Mau, S., Little, C. T. S., Linse, K., Pape, T., Gepraegs, P., Fischer, D., Wintersteller, P., Marcon, Y., Rethemeyer, J. and Bohrmann, G. (2014). First evidence of widespread active methane seepage in the Southern Ocean, off the sub-Antarctic island of South Georgia. Earth Planet. Sci. Lett., 403. S. 166 - 178. AMSTERDAM: ELSEVIER. ISSN 1385-013X

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Abstract

An extensive submarine cold-seep area was discovered on the northern shelf of South Georgia during R/V Polarstern cruise ANT-XXIX/4 in spring 2013. Hydroacoustic surveys documented the presence of 133 gas bubble emissions, which were restricted to glacially-formed fjords and troughs. Video-based sea floor observations confirmed the sea floor origin of the gas emissions and spatially related microbial mats. Effective methane transport from these emissions into the hydrosphere was proven by relative enrichments of dissolved methane in near-bottom waters. Stable carbon isotopic signatures pointed to a predominant microbial methane formation, presumably based on high organic matter sedimentation in this region. Although known from many continental margins in the world's oceans, this is the first report of an active area of methane seepage in the Southern Ocean. Our finding of substantial methane emission related to a trough and fjord system, a topographical setting that exists commonly in glacially-affected areas, opens up the possibility that methane seepage is a more widespread phenomenon in polar and sub-polar regions than previously thought. (C) 2014 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Roemer, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Torres, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kasten, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kuhn, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Graham, A. G. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mau, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Little, C. T. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Linse, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pape, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gepraegs, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fischer, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wintersteller, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Marcon, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rethemeyer, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bohrmann, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-427934
DOI: 10.1016/j.epsl.2014.06.036
Journal or Publication Title: Earth Planet. Sci. Lett.
Volume: 403
Page Range: S. 166 - 178
Date: 2014
Publisher: ELSEVIER
Place of Publication: AMSTERDAM
ISSN: 1385-013X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SANTA-BARBARA CHANNEL; COAL OIL POINT; TEMPORAL VARIATION; HYDROCARBON SEEP; CHEMICAL FLUXES; HYDRATE RIDGE; MUD VOLCANOS; BLACK-SEA; COLD-SEEP; OXIDATIONMultiple languages
Geochemistry & GeophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/42793

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