Alpine topography of the Gamburtsev Subglacial Mountains, Antarctica, mapped from ice sheet surface morphology
Landscapes buried beneath the Antarctic Ice Sheet preserve information about the geologic and geomorphic evolution of the continent both before and during the wide-scale glaciation that began roughly 34×106 years ago. Since the inception of this ice sheet, some areas have remained cold-based and non...
Published in: | The Cryosphere |
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Language: | English |
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Copernicus Publications
2024
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00072816 2024-05-12T07:53:49+00:00 Alpine topography of the Gamburtsev Subglacial Mountains, Antarctica, mapped from ice sheet surface morphology Lea, Edmund J. Jamieson, Stewart S. R. Bentley, Michael J. 2024-04 electronic https://doi.org/10.5194/tc-18-1733-2024 https://noa.gwlb.de/receive/cop_mods_00072816 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071011/tc-18-1733-2024.pdf https://tc.copernicus.org/articles/18/1733/2024/tc-18-1733-2024.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-18-1733-2024 https://noa.gwlb.de/receive/cop_mods_00072816 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071011/tc-18-1733-2024.pdf https://tc.copernicus.org/articles/18/1733/2024/tc-18-1733-2024.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2024 ftnonlinearchiv https://doi.org/10.5194/tc-18-1733-2024 2024-04-15T23:39:04Z Landscapes buried beneath the Antarctic Ice Sheet preserve information about the geologic and geomorphic evolution of the continent both before and during the wide-scale glaciation that began roughly 34×106 years ago. Since the inception of this ice sheet, some areas have remained cold-based and non-erosive, preserving ancient landscapes remarkably intact. The Gamburtsev Subglacial Mountains in central East Antarctica are one such landscape, maintaining evidence of tectonic, fluvial and glacial controls on their distinctly alpine morphology. The central Gamburtsev Mountains have previously been surveyed using airborne ice-penetrating radar; however, many questions remain as to their evolution and their influence on the East Antarctic Ice Sheet, including where in the region to drill for a 1.5×106 year-long “oldest-ice” core. Here, we derive new maps of the planform geometry of the Gamburtsev Subglacial Mountains from satellite remote sensing datasets of the ice sheet surface, based on the relationship between bed roughness and ice surface morphology. Automated and manual approaches to mapping were tested and validated against existing radar data and elevation models. Manual mapping was more effective than automated approaches at reproducing bed features observed in radar data, but a hybrid approach is suggested for future work. The maps produced here show the detail of mountain ridges and valleys on wavelengths significantly smaller than the spacing of existing radar flightlines, and mapping has extended well beyond the confines of existing radar surveys. Morphometric analysis of the mapped landscape reveals that it constitutes a preserved (>34 Ma) dendritic valley network, with some evidence for modification by topographically confined glaciation prior to ice sheet inception. The planform geometry of the landscape is a significant control on locations of basal melting, subglacial hydrological flows and the stability of the ice sheet over time, so the maps presented here may help to guide decisions about ... Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica ice core Ice Sheet The Cryosphere Niedersächsisches Online-Archiv NOA Antarctic The Antarctic East Antarctica East Antarctic Ice Sheet Gamburtsev Subglacial Mountains ENVELOPE(76.000,76.000,-80.500,-80.500) The Cryosphere 18 4 1733 1751 |
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Niedersächsisches Online-Archiv NOA |
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English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Lea, Edmund J. Jamieson, Stewart S. R. Bentley, Michael J. Alpine topography of the Gamburtsev Subglacial Mountains, Antarctica, mapped from ice sheet surface morphology |
topic_facet |
article Verlagsveröffentlichung |
description |
Landscapes buried beneath the Antarctic Ice Sheet preserve information about the geologic and geomorphic evolution of the continent both before and during the wide-scale glaciation that began roughly 34×106 years ago. Since the inception of this ice sheet, some areas have remained cold-based and non-erosive, preserving ancient landscapes remarkably intact. The Gamburtsev Subglacial Mountains in central East Antarctica are one such landscape, maintaining evidence of tectonic, fluvial and glacial controls on their distinctly alpine morphology. The central Gamburtsev Mountains have previously been surveyed using airborne ice-penetrating radar; however, many questions remain as to their evolution and their influence on the East Antarctic Ice Sheet, including where in the region to drill for a 1.5×106 year-long “oldest-ice” core. Here, we derive new maps of the planform geometry of the Gamburtsev Subglacial Mountains from satellite remote sensing datasets of the ice sheet surface, based on the relationship between bed roughness and ice surface morphology. Automated and manual approaches to mapping were tested and validated against existing radar data and elevation models. Manual mapping was more effective than automated approaches at reproducing bed features observed in radar data, but a hybrid approach is suggested for future work. The maps produced here show the detail of mountain ridges and valleys on wavelengths significantly smaller than the spacing of existing radar flightlines, and mapping has extended well beyond the confines of existing radar surveys. Morphometric analysis of the mapped landscape reveals that it constitutes a preserved (>34 Ma) dendritic valley network, with some evidence for modification by topographically confined glaciation prior to ice sheet inception. The planform geometry of the landscape is a significant control on locations of basal melting, subglacial hydrological flows and the stability of the ice sheet over time, so the maps presented here may help to guide decisions about ... |
format |
Article in Journal/Newspaper |
author |
Lea, Edmund J. Jamieson, Stewart S. R. Bentley, Michael J. |
author_facet |
Lea, Edmund J. Jamieson, Stewart S. R. Bentley, Michael J. |
author_sort |
Lea, Edmund J. |
title |
Alpine topography of the Gamburtsev Subglacial Mountains, Antarctica, mapped from ice sheet surface morphology |
title_short |
Alpine topography of the Gamburtsev Subglacial Mountains, Antarctica, mapped from ice sheet surface morphology |
title_full |
Alpine topography of the Gamburtsev Subglacial Mountains, Antarctica, mapped from ice sheet surface morphology |
title_fullStr |
Alpine topography of the Gamburtsev Subglacial Mountains, Antarctica, mapped from ice sheet surface morphology |
title_full_unstemmed |
Alpine topography of the Gamburtsev Subglacial Mountains, Antarctica, mapped from ice sheet surface morphology |
title_sort |
alpine topography of the gamburtsev subglacial mountains, antarctica, mapped from ice sheet surface morphology |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/tc-18-1733-2024 https://noa.gwlb.de/receive/cop_mods_00072816 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071011/tc-18-1733-2024.pdf https://tc.copernicus.org/articles/18/1733/2024/tc-18-1733-2024.pdf |
long_lat |
ENVELOPE(76.000,76.000,-80.500,-80.500) |
geographic |
Antarctic The Antarctic East Antarctica East Antarctic Ice Sheet Gamburtsev Subglacial Mountains |
geographic_facet |
Antarctic The Antarctic East Antarctica East Antarctic Ice Sheet Gamburtsev Subglacial Mountains |
genre |
Antarc* Antarctic Antarctica East Antarctica ice core Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica ice core Ice Sheet The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-18-1733-2024 https://noa.gwlb.de/receive/cop_mods_00072816 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071011/tc-18-1733-2024.pdf https://tc.copernicus.org/articles/18/1733/2024/tc-18-1733-2024.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-18-1733-2024 |
container_title |
The Cryosphere |
container_volume |
18 |
container_issue |
4 |
container_start_page |
1733 |
op_container_end_page |
1751 |
_version_ |
1798844937541779456 |