A regional picture of late glacial ice extents in Scoresby Sund, East Greenland

The Scoresby Sund region of East Greenland hosts both local mountain glaciers and Greenland Ice Sheet (GrIS) outlets, enabling comparison of their responses to past climate change. In this region, there are abundant, well-preserved moraines and other glacial deposits that range in age from late-glacial to historical time. Previous work has focused on mountain glacier systems in the Stauning Alper and GrIS outlet glaciers in Milne Land, but a regional picture of late-glacial ice extents has not been assembled until now. Here, we assimilate 79 previously published and 60 unpublished ¹⁰Be ages of moraines and perched boulders in the western Scoresby Sund region, spanning 150 km from the eastern Stauning Alper to southern Milne Land. In general, these data indicate moraine deposition and ice recession at 13 and 11 ka. We document similarly timed recession of both local glaciers and ice-sheet outlets, suggesting summer temperature as the driver for ice fluctuations in both glacier systems and sensitive response of the GrIS outlets. Currently, we are processing samples from a high-elevation plateau ( 500 m asl) in Scoresby Sund, which will constrain the timing of GrIS surface lowering prior to late glacial time.