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| Titel |
Sources, extent and history of methane seepage on the continental shelf off northern Norway |
| VerfasserIn |
Simone Sauer, Aivo Lepland, Shyam Chand, Carsten J. Schubert, Florian Eichinger, Jochen Knies |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250089511
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| Publikation (Nr.) |
 EGU/EGU2014-3716.pdf |
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| Zusammenfassung |
| Active natural hydrocarbon gas seepage was recently discovered in the Hola area on the
continental shelf off Vesterålen, northern Norway. We conducted acoustic and geochemical
investigations to assess the modern and past extent, source and pathways of the gas seepage
.
Water column echosounder surveys showed bubble plumes up to several tens of metres
above the seafloor. Analyses of dissolved methane in the water column indicated slightly
elevated concentrations (50nM) close to the seafloor. To identify fluxes and origin of
methane in the sediments we analysed sediment pore water chemistry, the isotopic
composition of methane and of dissolved inorganic carbon (d13CCH4, d2HCH4, d13CDIC) in
three closely spaced ( |
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