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  • 2010-2014  (15)
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  • 11
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    Unknown
    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
    Publication Date: 2019-07-17
    Description: 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
    Type: Conference , notRev
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 12
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    Age determination and faunal composition of sediments off northern Greenland (2014)
    PANGAEA
    In:  Supplement to: Nørgaard-Pedersen, Niels; Mikkelsen, Naja; Lassen, Susanne Juul; Kristoffersen, Yngve; Sheldon, Emma (2007): Reduced sea ice concentrations in the Arctic Ocean during the last interglacial period revealed by sediment cores off northern Greenland. Paleoceanography, 22(1), PA1218, https://doi.org/10.1029/2006PA001283
    Details
    Publication Date: 2023-01-13
    Description: We present a record encompassing marine isotope stages 7-1 from a hitherto unexplored and heavily ice-covered area of the Arctic Ocean, the Lomonosov Ridge off the northern Greenland-Canada continental margin, using nannofossil and benthic foraminifera stratigraphy. Planktic foraminifera assemblages are used as a key paleoceanographic proxy, and a surprisingly large variability is found for an interior Arctic Ocean site. Abundant small (63-125 µm) subpolar Turborotalita quinqueloba occur in two sections, possibly representing substages 5e (last interglacial) and 5a (warm interstadial). However, the present-day circulation pattern and the very distant location of high productive regions cannot explain such high abundances of subpolar specimens in the interior, perennially sea ice-covered Arctic Ocean. Hence our proxy record indicates that last interglacial sea ice concentrations were reduced off some areas of northern Greenland-Canada. Whether this was part of a larger regional pattern or it represents the influence of polynya areas with locally increased productivity remains to be solved. With respect to glacial conditions, increased ice-rafted debris (IRD) deposition in the area appears to be associated with glacial stages 6, 4, and late 3. Stage 2 sediments (including the Last Glacial Maximum) are condensed with a sparse IRD content only.
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 13
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    (Table 2) Age determination of sediment cores GreenICE_10 and GreenICE_11 (2014)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Age, 14C conventional; Age, 14C milieu/reservoir corrected (-440 yr); Age, dated; Age, dated, error to older; Age, dated, error to younger; Arctic Ocean; Calendar age; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Event label; GC; Gravity corer; GreenICE_10; GreenICE_11; Laboratory code/label; Neogloboquadrina pachyderma sinistral, δ13C; Neogloboquadrina pachyderma sinistral, δ13C standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 45 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 14
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    (Table 3) Nannofossil abundances in sediment cores GreenICE_10 and GreenICE_11 (2014)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Arctic Ocean; Coccolithus pelagicus; Comment; DEPTH, sediment/rock; Emiliania huxleyi; Event label; GC; Gephyrocapsa caribbeanica; Gephyrocapsa muellerae; Gephyrocapsa oceanica; Gravity corer; GreenICE_10; GreenICE_11; Lithologic unit/sequence
    Type: Dataset
    Format: text/tab-separated-values, 263 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 15
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    (Table 4) Planktic foraminifera in core-top sedoments of the Artic Ocean (2014)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Amundsen Basin; Arctic Ocean; ARK-VIII/3; Counting 〉63 µm fraction; DEPTH, sediment/rock; Elevation of event; Event label; Foraminifera, planktic indeterminata; GC; Giant box corer; GKG; Gravity corer; GreenICE_10; GreenICE_11; Latitude of event; Lomonosov Ridge, Arctic Ocean; Longitude of event; Neogloboquadrina pachyderma dextral; Neogloboquadrina pachyderma sinistral; Polarstern; PS19/175; PS19/186; PS19/206; PS19 ARCTIC91; PS2177-1; PS2185-3; PS2195-4; Turborotalita quinqueloba
    Type: Dataset
    Format: text/tab-separated-values, 20 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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