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  • COPERNICUS GESELLSCHAFT MBH  (2)
  • Wiley  (1)
  • 1
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    Layering of surface snow and firn at Kohnen Station, Antarctica - noise or seasonal signal? (2016)
    Wiley
    In:  EPIC3Journal of Geophysical Research: Earth Surface, Wiley, 121, pp. 1849-1860, ISSN: 21699003
    Details
    Publication Date: 2016-11-14
    Description: The density of firn is an important property for monitoring and modeling the ice sheet as well as to model the pore close-off and thus to interpret ice core-based greenhouse gas records. One feature, which is still in debate, is the potential existence of an annual cycle of firn density in low-accumulation regions. Several studies describe or assume seasonally successive density layers, horizontally evenly distributed, as seen in radar data. On the other hand, high-resolution density measurements on firn cores in Antarctica and Greenland showed no clear seasonal cycle in the top few meters. A major caveat of most existing snow-pit and firn-core based studies is that they represent one vertical profile from a laterally heterogeneous density field. To overcome this, we created an extensive dataset of horizontal and vertical density data at Kohnen Station, Dronning Maud Land on the East Antarctic Plateau. We drilled and analyzed three 90 m long firn cores as well as 160 one meter long vertical profiles from two elongated snow trenches to obtain a two dimensional view of the density variations. The analysis of the 45 m wide and 1 m deep density fields reveals a seasonal cycle in density. However, the seasonality is overprinted by strong stratigraphic noise, making it invisible when analyzing single firn cores. Our density dataset extends the view from the local ice-core perspective to a hundred meter scale and thus supports linking spatially integrating methods such as radar and seismic studies to ice and firn cores.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 2
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    Regional climate signal vs. local noise: a two-dimensional view of water isotopes in Antarctic firn at Kohnen station, Dronning Maud Land (2016)
    COPERNICUS GESELLSCHAFT MBH
    In:  EPIC3Climate of the Past, COPERNICUS GESELLSCHAFT MBH, 12, pp. 1565-1581, ISSN: 1814-9324
    Details
    Publication Date: 2017-09-22
    Description: In low-accumulation regions, the reliability of δ18O-derived temperature signals from ice cores within the Holocene is unclear, primarily due to the small climate changes relative to the intrinsic noise of the isotopic signal. In order to learn about the representativity of single ice cores and to optimise future ice-core-based climate reconstructions, we studied the stable-water isotope composition of firn at Kohnen Station, Dronning Maud Land, Antarctica. Analysing δ18O in two 50 m long snow trenches allowed us to create an unprecedented, two-dimensional image characterising the isotopic variations from the centimetre to the 100-metre scale. Our results show seasonal layering of the isotopic composition but also high horizontal isotopic variability caused by local stratigraphic noise. Based on the horizontal and vertical structure of the isotopic variations, we derive a statistical noise model which successfully explains the trench data. The model further allows one to determine an upper bound for the reliability of climate reconstructions conducted in our study region at seasonal to annual resolution, depending on the number and the spacing of the cores taken.
    Repository Name: EPIC Alfred Wegener Institut
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  • 3
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    Climatic information archived in ice cores: impact of intermittency and diffusion on the recorded isotopic signal in Antarctica (2019)
    COPERNICUS GESELLSCHAFT MBH
    In:  EPIC3Climatic information archived in ice cores: impact of intermittency and diffusion on the recorded isotopic signal in Antarctica, Climate of the Past Discussions, COPERNICUS GESELLSCHAFT MBH, ISSN: 1814-9324
    Details
    Publication Date: 2020-05-27
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , notRev
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