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Quantification of seep-related methane gas emissions at Tommeliten, North Sea

Authors
Schneider von Deimling, J.
Rehder, G.
Greinert, J.
Boetius, A.
Linke, P.
Published in Continental Shelf Research. 2011, vol. 31, no. 7-8, p. 867-878
Abstract Tommeliten is a prominent methane seep area in the Central North Sea. Previous surveys revealed shallow gas-bearing sediments and methane gas ebullition into the water column. In this study, the in situ methane flux at Tommeliten is re-assessed and the potential methane transport to the atmosphere is discussed, with regards to the hydrographic setting and gas bubble modeling. We have compiled previous data, acquired new video and acoustic evidence of gas bubble release, and have measured the methane concentration, and its C-isotopic composition in the water column. Parametric subbottom sonar data reveal the three-dimensional extent of shallow gas and morphologic features relevant for gas migration. Five methane ebullition areas are identified and the main seepage area appears to be 21 times larger than previously estimated. Our video, hydroacoustic, subbottom, and chemical data suggest that
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SCHNEIDER VON DEIMLING, J. et al. Quantification of seep-related methane gas emissions at Tommeliten, North Sea. In: Continental Shelf Research, 2011, vol. 31, n° 7-8, p. 867-878. https://archive-ouverte.unige.ch/unige:40708

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Deposited on : 2014-10-06

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