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

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, John Paden, Tamara Riese, Till Sachau, Nicolas Stoll, Ilka Weikusat, Frank Wilhelms, Yu Zhang and Paul D. Bons ()
Additional contact information
Daniela Jansen: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
Steven Franke: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
Catherine C. Bauer: Tübingen University
Tobias Binder: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
Dorthe Dahl-Jensen: University of Copenhagen
Jan Eichler: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
Olaf Eisen: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
Yuanbang Hu: Tübingen University
Johanna Kerch: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
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
Ilka Weikusat: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
Frank Wilhelms: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
Yu Zhang: Tübingen University
Paul D. Bons: Tübingen University

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-45021-8

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