Elevation changes of the Fennoscandian Ice Sheet interior during the last deglaciation

Lane, T.P., Paasche, Ø., Kvisvik, B., Adamson, K.R., Rodes, Á. , Patton, H., Gomez, N., Gheorghiu, D. , Bakke, J. and Hubbard, A. (2020) Elevation changes of the Fennoscandian Ice Sheet interior during the last deglaciation. Geophysical Research Letters, 47(14), e2020GL088. (doi: 10.1029/2020GL088796)

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The dynamics and paleo‐glaciology of ice sheet interiors during the last deglaciation are poorly constrained, hindering ice sheet model reconstructions. We provide direct evidence of Fennoscandian Ice Sheet (FIS) interior behavior during deglaciation through surface exposure dating. Our results demonstrate early thinning of the FIS, prior to the Younger Dryas (YD, 12.8–11.7 ka). Interior thinning in central Norway was concurrent with retreat along the coastline, exposing ice‐free mountainous tracts, potentially as early as 20–15 ka. The FIS then formed moraines in these ice‐free tracts during the YD. This is contrary to current hypotheses advocating a landscape fully covered by cold, inactive ice during this period. Present empirical and model reconstructions fail to capture rapid interior downwastage, increasing uncertainties in ice sheet volume estimates and sea level contributions.

Item Type:Articles
Additional Information:Funding Information: Advanced Climate Dynamics Courses (ACDC). Research Council of Norway (RCN). Grant Numbers: 275181, 200672, 223259. Polar Geospatial Center. Grant Numbers: 1542736, 1559691, 1043681. NERC CIAF Grant. Grant Number: 9176‐0417. Bjerknes Centre for Climate Research.
Glasgow Author(s) Enlighten ID:Rodes, Dr Angel and Gheorghiu, Dr Delia M
Authors: Lane, T.P., Paasche, Ø., Kvisvik, B., Adamson, K.R., Rodes, Á., Patton, H., Gomez, N., Gheorghiu, D., Bakke, J., and Hubbard, A.
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Geophysical Research Letters
ISSN (Online):1944-8007
Published Online:20 June 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Geophysical Research Letters 47(14):e2020GL088
Publisher Policy:Reproduced under a Creative Commons licence

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