Blar i forfatter "Feseker, Tomas"

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    • Biogeochemical Consequences of Nonvertical Methane Transport in Sediment Offshore Northwestern Svalbard 

      Treude, Tina; Krause, Stefan; Steinle, Lea; Burwicz, Ewa B.; Hamdan, L.J.; Niemann, Helge; Feseker, Tomas; Liebetrau, Volker; Krastel, Sebastian; Berndt, Christian (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-21)
      A site at the gas hydrate stability limit was investigated offshore northwestern Svalbard to study methane transport in sediment. The site was characterized by chemosynthetic communities (sulfur bacteria mats, tubeworms) and gas venting. Sediments were sampled with in situ porewater collectors and by gravity coring followed by analyses of porewater constituents, sediment and carbonate geochemistry, ...

    • Ocean temperature variability for the past 60 years on the Norwegian-Svalbard margin influences gas hydrate stability on human time scales 

      Ferré, Benedicte; Mienert, Jurgen; Feseker, Tomas (Journal article; Tidsskriftartikkel; Peer reviewed, 2012-10-23)
      The potential impact of future climate change on methane release from oceanic gas hydrates is the subject of much debate. We analyzed World Ocean Database quality controlled data on the Norwegian‐Svalbard continental margin from the past 60 years to evaluate the potential effect of ocean temperature variations on continental margin gas hydrate reservoirs. Bottom water temperatures in the Norwegian‐Svalbard ...

    • Temporal constraints on hydrate-controlled methane seepage off Svalbard 

      Berndt, Christian; Feseker, Tomas; Treude, Tina; Krastel, Sebastien; Liebetrau, Volker; Niemann, Helge; Bertics, Victoria; Dumke, Ines; Dünnbier, Karolin; Ferré, Benedicte; Graves, Carolyn; Gross, Felix; Hissmann, Karen; Hühnerbach, Veit; Krause, Stefan; Lieser, Kathrin; Schauer, Jürgen; Steinle, Lea (Journal article; Tidsskriftartikkel; Peer reviewed, 2014-01-17)
      Methane hydrate is an icelike substance that is stable at high pressure and low temperature in continental margin sediments. Since the discovery of a large number of gas flares at the landward termination of the gas hydrate stability zone off Svalbard, there has been concern that warming bottom waters have started to dissociate large amounts of gas hydrate and that the resulting methane release may ...