Blar i forfatter "Kulessa, Bernd"

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    • Seismic and electrical geophysical characterization of an incipient coastal open-system pingo: Lagoon Pingo, Svalbard 

      Hammock, Craig Paul; Kulessa, Bernd; Hiemstra, John F.; Hodson, Andrew; Hubbard, Alun (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-12-24)
      Whilst there has been a recent appreciation for the role of open-system pingos in providing a fluid-flow conduit through continuous permafrost that enables methane release, the formation and internal structure of these ubiquitous permafrost-diagnostic landforms remains unclear. Here, we combine active-source seismic measurements with electrical resistivity tomography (ERT) to investigate the structural ...

    • Seismic evidence for complex sedimentary control of Greenland Ice Sheet flow 

      Kulessa, Bernd; Hubbard, Alun Lloyd; Booth, Adam D.; Bougamont, Marion; Dow, Christine F.; Doyle, Samuel H.; Christoffersen, Poul; Lindbäck, Katrin; Pettersson, Rickard; Fitzpatrick, Andrew A.W.; Jones, Glenn A. (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-08-16)
      The land-terminating margin of the Greenland Ice Sheet has slowed down in recent decades, although the causes and implications for future ice flow are unclear. Explained originally by a self-regulating mechanism where basal slip reduces as drainage evolves from low to high efficiency, recent numerical modeling invokes a sedimentary control of ice sheet flow as an alternative hypothesis. Although ...