| 英文摘要 | 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. © 2020 Author(s). This work is distributed under the Creative Commons Attribution 4.0 License. |
| 作者单位 | Department of Geography, Durham University, Durham, DH1 3LE, United Kingdom; School of Geography Politics and Sociology, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom; Departamento de Geografía, Universidad de Chile, Portugal, Santiago, 84, Chile; Instituto de Conservación Biodiversidad y Territorio, Facultad de Ciencias Forestales y Recursos Naturales, Universidad Austral de Chile, Valdivia, Chile; British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom; Department of Earth Science and Engineering, Grantham Institute, Imperial College London, South Kensington, London, SW7 2AZ, United Kingdom; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Instituto de Ciencias Físicas y Matemáticas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile; Centro de Estudios Científicos, Arturo Prat 514, Valdivia, Chile
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| APA |
Napoleoni F..,Jamieson S.S.R.J..,Ross N..,Bentley M.J..,Rivera A..,...&Vaughan D.G..(2020).Subglacial lakes and hydrology across the Ellsworth Subglacial Highlands, West Antarctica.Cryosphere,14(12).
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