Ice surface changes during recent glacial cycles along the Jutulstraumen and Penck Trough ice streams in western Dronning Maud Land, East Antarctica

Andersen, J.L. et al. (2020) Ice surface changes during recent glacial cycles along the Jutulstraumen and Penck Trough ice streams in western Dronning Maud Land, East Antarctica. Quaternary Science Reviews, 249, 106636. (doi: 10.1016/j.quascirev.2020.106636)

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Abstract

Reconstructing past ice-sheet surface changes is key to testing and improving ice-sheet models. Data constraining the past behaviour of the East Antarctic Ice Sheet are sparse, limiting our understanding of its response to past, present and future climate change. Here, we report the first cosmogenic multi-nuclide (10Be, 26Al, 36Cl) data from bedrock and erratics on nunataks along the Jutulstraumen and Penck Trough ice streams in western Dronning Maud Land, East Antarctica. Spanning elevations between 741 and 2394 m above sea level, the samples have apparent exposure ages between 2 ka and 5 Ma. The highest-elevation bedrock sample indicates (near-) continuous minimum exposure since the Pliocene, with a low apparent erosion rate of 0.15 ± 0.03 m Ma−1, which is similar to results from eastern Dronning Maud Land. In contrast to studies in eastern Dronning Maud Land, however, our data show clear indications of a thicker-than-present ice sheet within the last glacial cycle, with a thinning of ∼35–120 m during the Holocene (∼2–11 ka). Difficulties in separating suitable amounts of quartz from the often quartz-poor rock-types in the area, and cosmogenic nuclides inherited from exposure prior to the last deglaciation, prevented robust thinning estimates from elevational profiles. Nevertheless, the results clearly demonstrate ice-surface fluctuations of several hundred meters between the current grounding line and the edge of the polar plateau for the last glacial cycle, a constraint that should be considered in future ice-sheet model simulations.

Item Type:Articles
Additional Information:This material is based upon work supported by Stockholm University (APS), Norwegian Polar Institute/NARE under Grant “MAGIC-DML” (OF), the US National Science Foundation under Grant No. PLR-1542930 (JMH & NL) and EAR-1560658 (MWC), Swedish Research Council under Grant No. 2016–04422 (JMH & APS), the German Research Foundation (DFG), Priority Programme 1158 “Antarctic Research” under Grant No. 365737614 (IR), and the German Aerospace Centre (DLR) for TerraSAR-X/TanDEM-X data under grant “DEM_GLAC1773” (OF).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Fabel, Dr Derek
Authors: Andersen, J.L., Newall, J.C., Blomdin, R., Sams, S.E., Fabel, D., Koester, A.J., Lifton, N.A., Fredin, O., Caffee, M.W., Glasser, N. F., Rogozhina, I., Suganuma, Y., Harbor, J.M., and Stroeven, A.P.
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Quaternary Science Reviews
Publisher:Elsevier
ISSN:0277-3791
ISSN (Online):1873-457X
Published Online:21 October 2020
Copyright Holders:Copyright © 2020 Elsevier Ltd.
First Published:First published in Quaternary Science Reviews 249: 106636
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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