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Preprints
https://doi.org/10.5194/tc-2019-281
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-2019-281
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  13 Jan 2020

13 Jan 2020

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A revised version of this preprint is currently under review for the journal TC.

Last Glacial ice-sheet dynamics offshore NE Greenland – a case study from Store Koldewey Trough

Ingrid Leirvik Olsen1, Matthias Forwick1, Jan Sverre Laberg1, Tom Arne Rydningen1, and Katrine Husum2 Ingrid Leirvik Olsen et al.
  • 1Department of Geosciences, UiTThe Arctic University of Norway, Box 6050 Langnes, 9037 Tromsø, Norway
  • 2Norwegian Polar Institute, Box 6606 Langnes, 9296 Tromsø, Norway

Abstract. New swath bathymetry and high-resolution seismic data, supplemented with multi-proxy analyses of sediment gravity cores from Store Koldewey Trough, NE Greenland, support the presence of a shelf-break terminating Greenland Ice Sheet (GIS) on the northeastern part of the Greenland Margin during the Last Glacial Maximum (LGM). The presence of mega-scale glacial lineations and a grounding zone wedge in the outer part of the trough provides evidence of the expansion of fast-flowing, grounded ice, probably originating from the area presently covered with the Storstrømmen ice stream and cutting across Store Koldewey Island and Germania Land. Multiple halts and/or readvances interrupted the deglaciation. Two sets of crevasse-squeezed ridges in the outer and middle part of the trough may indicate repeated surging of the GIS during the deglaciation. The complex landform assemblage in Store Koldewey Trough is suggested to reflect a relatively slow and stepwise retreat during the deglaciation. Thus, the ice retreat probably occurred asynchronously relative to other ice streams offshore NE Greenland. Subglacial till fills the trough, with an overlying thin drape of maximum 2.5 m thickness of glacier proximal and glacier distal sediment. At a late stage of the deglaciation, the ice stream retreated across Store Koldewey Island and Germania Land, terminating the sediment input from this sector of the GIS to Store Koldewey Trough.

Ingrid Leirvik Olsen et al.

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Ingrid Leirvik Olsen et al.

Ingrid Leirvik Olsen et al.

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Short summary
We provide new marine-geoscientific data confirming the presence of a shelf-break terminating Greenland Ice Sheet on the northeastern part of the Greenland Margin during the last glacial. We show landforms indicating that the ice stream probably underwent at least two glacial surges. The complex landform assemblage is suggested to reflect a relatively slow and stepwise retreat during the deglaciation, probably occurring asynchronously relative to other ice streams offshore NE Greenland.
We provide new marine-geoscientific data confirming the presence of a shelf-break terminating...
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