Sediment Redistribution Beneath the Terminus of an Advancing Glacier, Taku Glacier (T’Aakú Kwáan Sít’I), Alaska
Journal of Glaciology Sediment redistribution beneath the terminus of an advancing glacier, Taku Glacier (T’aakú Kwáan Sít’i), Alaska Article Jenna M. Zechmann1, Martin Truffer1 , Roman J. Motyka1 , 2 1 Cite this article: Zechmann JM, Truffer M, Jason M. Amundson and Chris F. Larsen Motyka RJ, Amundson JM, Larsen CF (2021). Sediment redistribution beneath the terminus 1Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, USA and 2Department of Natural Sciences, of an advancing glacier, Taku Glacier (T’aakú University of Alaska Southeast, Juneau, AK, USA Kwáan Sít’i), Alaska. Journal of Glaciology 67 (262), 204–218. https://doi.org/10.1017/ jog.2020.101 Abstract The recently-advancing Taku Glacier is excavating subglacial sediments at high rates over multi- Received: 2 March 2020 Revised: 9 November 2020 decadal timescales. However, sediment redistribution over shorter timescales remains unquanti- Accepted: 10 November 2020 fied. We use a variety of methods to study subglacial and proglacial sediment redistribution on First published online: 23 December 2020 decadal, seasonal, and daily timescales to gain insight into sub- and proglacial landscape − formation. Both excavation and deposition were observed from 2003 to 2015 (2.8 ± 0.9 m a 1 Keywords: −1 Atmosphere/ice/ocean interactions; fluvial to +2.9 ± 0.9 m a ). The observed patterns imply that a subglacial conduit has occupied the transport; glacier hydrology; moraine same site over the past decade. Outwash fans on the subaerial end moraine experience fluvial formation; processes and landforms of glacial sediment reworking almost year-round, with net sediment gain in winter and net sediment erosion loss in summer, and an overall mass gain between 2005 and 2015.
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