Glacial history of Inglefield Land, north Greenland from combined in situ 10Be and 14C exposure dating ...

• Main Authors: Søndergaard, Anne S., Larsen, Nicolaj K., Steinemann, Olivia, Olsen, Jesper, Funder, Svend, Egholm, David L., Kjær, Kurt H.
• Format: Article in Journal/Newspaper
• Language: English
• Published: ETH Zurich 2020
• Subjects: Greenland; Ice Sheet; Inglefield land; North Greenland
• Online Access: https://dx.doi.org/10.3929/ethz-b-000452338; http://hdl.handle.net/20.500.11850/452338

Determining the sensitivity of the Greenland Ice Sheet (GrIS) to Holocene climate changes is a key prerequisite for understanding the future response of the ice sheet to global warming. In this study, we present new information on the Holocene glacial history of the GrIS in Inglefield Land, north Greenland. We use 10Be and in situ 14C exposure dating to constrain the timing of deglaciation in the area and radiocarbon dating of reworked molluscs and wood fragments to constrain when the ice sheet retreated behind its present-day extent. The 10Be ages are scattered ranging from ca. 92.7 to 6.8 ka, whereas the in situ 14C ages range from ca. 14.2 to 6.7 ka. Almost half of the apparent 10Be ages predate the Last Glacial Maximum and up to 89 % are to some degree affected by nuclide inheritance. Based on the few reliable 10Be ages, the in situ 14C ages and existing radiocarbon ages from Inglefield Land, we find that the deglaciation along the coast commenced at ca. 8.6–8.3 ka cal BP in the western part and ca. 7.9 ... : Climate of the Past, 16 (5) ...