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  • 1
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    Assessing Approaches for Determination of Liquid Water in Snow (2014)
    AGU
    In:  EPIC3EOS, AGU, 95(36), 328 p.
    Details
    Publikationsdatum: 2014-11-05
    Beschreibung: Scientists with expertise in avalanche formation, remote sensing issues, and other cryospheric matters gathered in Davos, Switzerland, in early April for a workshop on liquid water in snow—the first such meeting since 1982. The focus of this year's workshop, held at the Institute for Snow and Avalanche Research, was to compare different measurement techniques and their accuracy, to discuss current assumptions for modeling liquid water transport and storage in snow, and to gather ideas on how to best obtain good validation and verification data.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Miscellaneous , notRev
    Format: application/pdf
    Standort Signatur Einschränkungen Verfügbarkeit
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    ARTIKEL (OA)
  • 2
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    A combined Vibroseis-Explosive survey at Halvfarryggen, a local ice dome in East Antarctica (2012)
    AGU
    In:  EPIC3AGU Fall Meeting, San Francisco, 2012-12-02-2012-12-07San Francisco, AGU
    Details
    Publikationsdatum: 2019-07-17
    Beschreibung: We carried out a combined Vibroseis-Explosive survey in combination with a snowstreamer at Halvfarryggen, a local ice dome at a triple point in the vicinity of the German Antarctic research station NeumayerIII. The Vibroseis survey was grid shaped to give spatial information about the glaciological and geological substructure. The center survey line was also surveyed with explosives and compared with the Vibroseis data. Internal ice reflections, clearly visible with explosives are not well visible in the Vibroseis data except for the strongest and deepest internal reflection. We interpret this deepest internal ice reflector as ice crystals orientated in to a single maximum. The ice bed contact we interpret as a frozen till layer overlaying bedrock. From velocity analysis derived from refractions seen in far offset data, we interpret the bedrock as igneous.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Conference , notRev
    Standort Signatur Einschränkungen Verfügbarkeit
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    ARTIKEL (OA)
  • 3
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    Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream (2023)
    Springer Nature
    In:  EPIC3Nature Communications, Springer Nature, 14(1), pp. 2653-2653, ISSN: 2041-1723
    Details
    Publikationsdatum: 2023-10-19
    Beschreibung: The dynamic mass loss of ice sheets constitutes one of the biggest uncertainties in projections of ice-sheet evolution. One central, understudied aspect of ice flow is how the bulk orientation of the crystal orientation fabric translates to the mechanical anisotropy of ice. Here we show the spatial distribution of the depth-averaged horizontal anisotropy and corresponding directional flow-enhancement factors covering a large area of the Northeast Greenland Ice Stream onset. Our results are based on airborne and ground-based radar surveys, ice-core observations, and numerical ice-flow modelling. They show a strong spatial variability of the horizontal anisotropy and a rapid crystal reorganisation on the order of hundreds of years coinciding with the ice-stream geometry. Compared to isotropic ice, parts of the ice stream are found to be more than one order of magnitude harder for along-flow extension/compression while the shear margins are potentially softened by a factor of two for horizontal-shear deformation.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Format: application/pdf
    Standort Signatur Einschränkungen Verfügbarkeit
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    ARTIKEL (OA)
  • 4
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    Three-dimensional topology dataset of folded radar stratigraphy in northern Greenland (2023)
    Springer Nature
    In:  EPIC3Scientific Data, Springer Nature, 10(1), pp. 525-525, ISSN: 2052-4463
    Details
    Publikationsdatum: 2024-04-29
    Beschreibung: We present a dataset of reconstructed three-dimensional (3D) englacial stratigraphic horizons in northern Greenland. The data cover four different regions representing key ice-dynamic settings in Greenland: (i) the onset of Petermann Glacier, (ii) a region upstream of the 79° North Glacier (Nioghalvfjerdsbræ), near the northern Greenland ice divide, (iii) the onset of the Northeast Greenland Ice Stream (NEGIS) and (iv) a 700 km wide region extending across the central ice divide over the entire northern part of central Greenland. In this paper, we promote the advantages of a 3D perspective of deformed englacial stratigraphy and explain how 3D horizons provide an improved basis for interpreting and reconstructing the ice-dynamic history. The 3D horizons are provided in various formats to allow a wide range of applications and reproducibility of results.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Format: application/pdf
    Standort Signatur Einschränkungen Verfügbarkeit
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    ARTIKEL (OA)
  • 5
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    Geophysics (2021)
    Springer Nature
    In:  EPIC3Springer Nature, pp. 349-381, ISBN: 9783030425821
    Details
    Publikationsdatum: 2024-04-13
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Inbook , peerRev
    Format: application/pdf
    Standort Signatur Einschränkungen Verfügbarkeit
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    ARTIKEL (OA)
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