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. The presence of a grounded Greenland Ice Sheet on the northeastern part ofthe Greenland continental shelf during the Last Glacial Maximum is supportedby new swath bathymetry and high-resolution seismic data, supplemented withmulti-proxy analyses of sediment gravity cores from Store Koldewey Trough.Subglacial till fills the trough, with an overlying drape of maximum 2.5 mthick glacier-proximal and glacier-distal sediment. The presence ofmega-scale glacial lineations and a grounding zone wedge in the outer partof the trough, comprising subglacial till, provides evidence of theexpansion of fast-flowing, grounded ice, probably originating from the areapresently covered with the Storstrømmen ice stream and thereby previouslyflowing across Store Koldewey Island and Germania Land. Grounding zonewedges and recessional moraines provide evidence that multiple halts and/orreadvances interrupted the deglaciation. The formation of the grounding zonewedges is estimated to be at least 130 years, while distances between therecessional moraines indicate that the grounding line locally retreatedbetween 80 and 400 m yr−1 during the deglaciation, assuming that themoraines formed annually. The complex geomorphology in Store Koldewey Troughis attributed to the trough shallowing and narrowing towards the coast. At alate stage of the deglaciation, the ice stream flowed around the topographyon Store Koldewey Island and Germania Land, terminating the sediment inputfrom this sector of the Greenland Ice Sheet to Store Koldewey Trough.

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