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Subglacial lakes and hydrology across the Ellsworth Subglacial Highlands, West Antarctica

Napoleoni, F. and Jamieson, S.S.R. and Ross, N. and Bentley, M.J. and Rivera, A. and Smith, A.M. and Siegert, M.J. and Paxman, G.J.G. and Gacitua, G. and Uribe, J.A. and Zamora, R. and Brisbourne, A.M. and Vaughan, D.G. (2020) 'Subglacial lakes and hydrology across the Ellsworth Subglacial Highlands, West Antarctica.', The cryosphere., 14 . pp. 4507-4524.

Abstract

Subglacial water plays an important role in ice sheet dynamics and stability. Subglacial lakes are often located at the onset of ice streams and have been hypothesised to enhance ice flow downstream by lubricating the ice– bed interface. The most recent subglacial-lake inventory of Antarctica mapped nearly 400 lakes, of which ∼ 14 % are found in West Antarctica. Despite the potential importance of subglacial water for ice dynamics, there is a lack of detailed subglacial-water characterisation in West Antarctica. Using radio-echo sounding data, we analyse the ice–bed interface to detect subglacial lakes. We report 33 previously uncharted subglacial lakes and present a systematic analysis of their physical properties. This represents a ∼ 40 % increase in subglacial lakes in West Antarctica. Additionally, a new digital elevation model of basal topography of the Ellsworth Subglacial Highlands was built and used to create a hydropotential model to simulate the subglacial hydrological network. This allows us to characterise basal hydrology, determine subglacial water catchments and assess their connectivity. We show that the simulated subglacial hydrological catchments of the Rutford Ice Stream, Pine Island Glacier and Thwaites Glacier do not correspond to their ice surface catchments.

Item Type:Article
Full text:(VoR) Version of Record
Available under License - Creative Commons Attribution 4.0.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.5194/tc-14-4507-2020
Publisher statement:© Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
Date accepted:25 September 2020
Date deposited:20 January 2021
Date of first online publication:10 December 2020
Date first made open access:20 January 2021

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