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Shear margins in upper half of Northeast Greenland Ice Stream were established two millennia ago

Author

Listed:
  • Daniela Jansen

    (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research)

  • Steven Franke

    (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
    Tübingen University)

  • Catherine C. Bauer

    (Tübingen University)

  • Tobias Binder

    (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
    Now at ATLAS ELEKTRONIK GmbH)

  • Dorthe Dahl-Jensen

    (University of Copenhagen
    University of Manitoba)

  • Jan Eichler

    (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
    Université Claude Bernard Lyon 1, CNRS)

  • Olaf Eisen

    (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
    University of Bremen)

  • Yuanbang Hu

    (Tübingen University
    Chengdu University of Technology)

  • Johanna Kerch

    (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
    University of Göttingen)

  • Maria-Gema Llorens

    (GEO3BCN, CSIC, Lluís Solé Sabarís s/n)

  • Heinrich Miller

    (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research)

  • Niklas Neckel

    (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research)

  • John Paden

    (University of Kansas)

  • Tamara Riese

    (Tübingen University)

  • Till Sachau

    (Tübingen University)

  • Nicolas Stoll

    (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
    Ca’Foscari University Venice)

  • Ilka Weikusat

    (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
    Tübingen University)

  • Frank Wilhelms

    (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
    University of Göttingen)

  • Yu Zhang

    (Tübingen University)

  • Paul D. Bons

    (Tübingen University
    China University of Geosciences (Beijing))

Abstract

Only a few localised ice streams drain most of the ice from the Greenland Ice Sheet. Thus, understanding ice stream behaviour and its temporal variability is crucially important to predict future sea-level change. The interior trunk of the 700 km-long North-East Greenland Ice Stream (NEGIS) is remarkable due to the lack of any clear bedrock channel to explain its presence. Here, we present a 3-dimensional analysis of the folding and advection of its stratigraphic horizons, which shows that the localised flow and shear margins in the upper NEGIS were fully developed only ca 2000 years ago. Our results contradict the assumption that the ice stream has been stable throughout the Holocene in its current form and show that upper NEGIS-type development of ice streaming, with distinct shear margins and no bed topography relationship, can be established on time scales of hundreds of years, which is a major challenge for realistic mass-balance and sea-level rise projections.

Suggested Citation

  • Daniela Jansen & Steven Franke & Catherine C. Bauer & Tobias Binder & Dorthe Dahl-Jensen & Jan Eichler & Olaf Eisen & Yuanbang Hu & Johanna Kerch & Maria-Gema Llorens & Heinrich Miller & Niklas Neckel, 2024. "Shear margins in upper half of Northeast Greenland Ice Stream were established two millennia ago," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45021-8
    DOI: 10.1038/s41467-024-45021-8
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