Washington Land, Greenland Late Pleistocene to Holocene 10Be Moraine Ages Reusche, M.M.; Marcott, S.A.; Ceperley, E.G.; Barth, A.M.; Brook, E.J.; Mix, A.C.; Caffee, M.W. Reusche, M.M. Marcott, S.A. Ceperley, E.G. Barth, A.M. Brook, E.J. Mix, A.C. Caffee, M.W. earth science/paleoclimate/others (Petermann Glacier>LATITUDE 80.7>LONGITUDE -59.3) (Humboldt Glacier>LATITUDE 79.9>LONGITUDE -64.2) Terrestrial chronologies from southern Greenland provide a detailed deglacial history of the Greenland Ice Sheet (GIS). The northern GIS margin history, however, is less established. Here we present surface exposure ages from moraines associated with two large outlet glaciers, Petermann and Humboldt, in the northwestern sector of the GIS. These moraine chronologies indicate a Little Ice Age advance of the ice sheet margin before ~0.3 ka and a possible equivalent advance of similar magnitude prior to ~2.8 ka. An early Holocene moraine at Humboldt Glacier was abandoned by 8.3 ± 1.7 ka and is contemporaneous with other moraines deposited along the entire western GIS margin. This widespread ice margin stability between ~9 and 8 ka indicates that while this margin was influenced by warming atmospheric temperatures during the early Holocene, the warming was likely overprinted with the effect of the abrupt climate cooling at 9.3 and 8.2 ka. STUDY NOTES: 10Be ages from boulders on moraines of the Petermann and Humboldt glaciers NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Reusche, M.M. Investigator : Marcott, S.A. Investigator : Ceperley, E.G. Investigator : Barth, A.M. Investigator : Brook, E.J. Investigator : Mix, A.C. Investigator : Caffee, M.W. 2018-08-30 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/25070 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/reusche2018/reusche2018-10beages.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/reusche2018/reusche2018-10beages.txt English https://www.ncdc.noaa.gov/paleo/study/25070 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/reusche2018/reusche2018-10beages.txt Melissa M. Reusche, Shaun A. Marcott, Elizabeth G. Ceperley, Aaron M. Barth, Edward J. Brook, Alan C. Mix, Marc W. Caffee2018Early to Late Holocene Surface Exposure Ages From Two Marine-Terminating Outlet Glaciers in Northwest GreenlandGeophysical Research Letters45147028-703910.1029/2018GL078266https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018GL078266 START YEAR: 11500 cal yr BP * END YEAR: 75 cal yr BP -64.2 79.9 -59.3 80.7