Englacial architecture of Lambert Glacier, East Antarctica
The analysis of englacial layers using radio-echo sounding data enables the characterisation and reconstruction of current and past ice-sheet flow. Despite the Lambert Glacier catchment being one of the largest in Antarctica, discharging ∼16 % of East Antarctica's ice, its englacial architectur...
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American Geophysical Union
2023
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Online Access: | http://nora.nerc.ac.uk/id/eprint/534025/ https://nora.nerc.ac.uk/id/eprint/534025/1/tc-17-4853-2023.pdf https://tc.copernicus.org/articles/17/4853/2023/ |
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ftnerc:oai:nora.nerc.ac.uk:534025 2024-01-21T10:01:49+01:00 Englacial architecture of Lambert Glacier, East Antarctica Sanderson, Rebecca J. Winter, Kate Callard, S. Louise Napoleoni, Felipe Ross, Neil Jordan, Tom A. Bingham, Robert G. 2023-11-20 text http://nora.nerc.ac.uk/id/eprint/534025/ https://nora.nerc.ac.uk/id/eprint/534025/1/tc-17-4853-2023.pdf https://tc.copernicus.org/articles/17/4853/2023/ en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/534025/1/tc-17-4853-2023.pdf Sanderson, Rebecca J.; Winter, Kate; Callard, S. Louise; Napoleoni, Felipe; Ross, Neil; Jordan, Tom A. orcid:0000-0003-2780-1986 Bingham, Robert G. 2023 Englacial architecture of Lambert Glacier, East Antarctica. The Cryosphere, 17 (11). 4853-4871. https://doi.org/10.5194/tc-17-4853-2023 <https://doi.org/10.5194/tc-17-4853-2023> cc_by_4 Publication - Article PeerReviewed 2023 ftnerc https://doi.org/10.5194/tc-17-4853-2023 2023-12-22T00:03:08Z The analysis of englacial layers using radio-echo sounding data enables the characterisation and reconstruction of current and past ice-sheet flow. Despite the Lambert Glacier catchment being one of the largest in Antarctica, discharging ∼16 % of East Antarctica's ice, its englacial architecture has been little analysed. Here, we present a comprehensive analysis of Lambert Glacier's englacial architecture using radio-echo sounding data collected by Antarctica's Gamburtsev Province Project (AGAP) North survey. We used an internal layering continuity index (ILCI) to characterise the internal architecture of the ice and identify four macro-scale ILCI zones with distinct glaciological contexts. Whilst the catchment is dominated by continuous englacial layering, disrupted or discontinuous layering is highlighted by the ILCI at both the onset of enhanced ice flow (defined here as >15 m a−1) and along the shear margin, suggesting a transition in englacial deformation conditions and converging ice flow. These zones are characterised by buckled and folded englacial layers which have fold axes aligned with the current ice-flow regime. These folds suggest that the flow direction of the Lambert Glacier trunk has changed little, if at all, during the Holocene. Disturbed englacial layers that do not correspond to modern ice-flow routing found within a deep subglacial channel, however, suggest that ice-flow change has occurred in a former tributary that fed Lambert Glacier from grid north. As large outlet systems such as Lambert Glacier are likely to play a vital role in the future drainage of the East Antarctic Ice Sheet, constraining their englacial architecture to reconstruct their past ice flow and determine basal conditions is important for refining projections of future sea-level change. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Lambert Glacier The Cryosphere Natural Environment Research Council: NERC Open Research Archive Antarctic East Antarctica East Antarctic Ice Sheet Lambert Glacier ENVELOPE(67.490,67.490,-73.065,-73.065) The Cryosphere 17 11 4853 4871 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
The analysis of englacial layers using radio-echo sounding data enables the characterisation and reconstruction of current and past ice-sheet flow. Despite the Lambert Glacier catchment being one of the largest in Antarctica, discharging ∼16 % of East Antarctica's ice, its englacial architecture has been little analysed. Here, we present a comprehensive analysis of Lambert Glacier's englacial architecture using radio-echo sounding data collected by Antarctica's Gamburtsev Province Project (AGAP) North survey. We used an internal layering continuity index (ILCI) to characterise the internal architecture of the ice and identify four macro-scale ILCI zones with distinct glaciological contexts. Whilst the catchment is dominated by continuous englacial layering, disrupted or discontinuous layering is highlighted by the ILCI at both the onset of enhanced ice flow (defined here as >15 m a−1) and along the shear margin, suggesting a transition in englacial deformation conditions and converging ice flow. These zones are characterised by buckled and folded englacial layers which have fold axes aligned with the current ice-flow regime. These folds suggest that the flow direction of the Lambert Glacier trunk has changed little, if at all, during the Holocene. Disturbed englacial layers that do not correspond to modern ice-flow routing found within a deep subglacial channel, however, suggest that ice-flow change has occurred in a former tributary that fed Lambert Glacier from grid north. As large outlet systems such as Lambert Glacier are likely to play a vital role in the future drainage of the East Antarctic Ice Sheet, constraining their englacial architecture to reconstruct their past ice flow and determine basal conditions is important for refining projections of future sea-level change. |
format |
Article in Journal/Newspaper |
author |
Sanderson, Rebecca J. Winter, Kate Callard, S. Louise Napoleoni, Felipe Ross, Neil Jordan, Tom A. Bingham, Robert G. |
spellingShingle |
Sanderson, Rebecca J. Winter, Kate Callard, S. Louise Napoleoni, Felipe Ross, Neil Jordan, Tom A. Bingham, Robert G. Englacial architecture of Lambert Glacier, East Antarctica |
author_facet |
Sanderson, Rebecca J. Winter, Kate Callard, S. Louise Napoleoni, Felipe Ross, Neil Jordan, Tom A. Bingham, Robert G. |
author_sort |
Sanderson, Rebecca J. |
title |
Englacial architecture of Lambert Glacier, East Antarctica |
title_short |
Englacial architecture of Lambert Glacier, East Antarctica |
title_full |
Englacial architecture of Lambert Glacier, East Antarctica |
title_fullStr |
Englacial architecture of Lambert Glacier, East Antarctica |
title_full_unstemmed |
Englacial architecture of Lambert Glacier, East Antarctica |
title_sort |
englacial architecture of lambert glacier, east antarctica |
publisher |
American Geophysical Union |
publishDate |
2023 |
url |
http://nora.nerc.ac.uk/id/eprint/534025/ https://nora.nerc.ac.uk/id/eprint/534025/1/tc-17-4853-2023.pdf https://tc.copernicus.org/articles/17/4853/2023/ |
long_lat |
ENVELOPE(67.490,67.490,-73.065,-73.065) |
geographic |
Antarctic East Antarctica East Antarctic Ice Sheet Lambert Glacier |
geographic_facet |
Antarctic East Antarctica East Antarctic Ice Sheet Lambert Glacier |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Lambert Glacier The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Lambert Glacier The Cryosphere |
op_relation |
https://nora.nerc.ac.uk/id/eprint/534025/1/tc-17-4853-2023.pdf Sanderson, Rebecca J.; Winter, Kate; Callard, S. Louise; Napoleoni, Felipe; Ross, Neil; Jordan, Tom A. orcid:0000-0003-2780-1986 Bingham, Robert G. 2023 Englacial architecture of Lambert Glacier, East Antarctica. The Cryosphere, 17 (11). 4853-4871. https://doi.org/10.5194/tc-17-4853-2023 <https://doi.org/10.5194/tc-17-4853-2023> |
op_rights |
cc_by_4 |
op_doi |
https://doi.org/10.5194/tc-17-4853-2023 |
container_title |
The Cryosphere |
container_volume |
17 |
container_issue |
11 |
container_start_page |
4853 |
op_container_end_page |
4871 |
_version_ |
1788692011833884672 |