Englacial Architecture and Age-Depth Constraints Across the West Antarctic Ice Sheet
The englacial stratigraphic architecture of internal reflection horizons (IRHs) as imaged by ice-penetrating radar (IPR) across ice sheets reflects the cumulative effects of surface mass balance, basal melt, and ice flow. IRHs, considered isochrones, have typically been traced in interior, slow-flow...
Published in: | Geophysical Research Letters |
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American Geophysical Union (AGU)
2020
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Online Access: | http://livrepository.liverpool.ac.uk/3077420/ https://doi.org/10.1029/2019gl086663 http://livrepository.liverpool.ac.uk/3077420/1/2020_ashmore_GRL.pdf |
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ftunivliverpool:oai:livrepository.liverpool.ac.uk:3077420 2023-05-15T13:52:02+02:00 Englacial Architecture and Age-Depth Constraints Across the West Antarctic Ice Sheet Ashmore, David W Bingham, Robert G Ross, Neil Siegert, Martin Jordan, Tom A Mair, Douglas WF 2020 text http://livrepository.liverpool.ac.uk/3077420/ https://doi.org/10.1029/2019gl086663 http://livrepository.liverpool.ac.uk/3077420/1/2020_ashmore_GRL.pdf en eng American Geophysical Union (AGU) http://livrepository.liverpool.ac.uk/3077420/1/2020_ashmore_GRL.pdf Ashmore, David W orcid:0000-0003-4829-7854 , Bingham, Robert G, Ross, Neil, Siegert, Martin, Jordan, Tom A and Mair, Douglas WF orcid:0000-0001-7009-5461 (2020) Englacial Architecture and Age-Depth Constraints Across the West Antarctic Ice Sheet. GEOPHYSICAL RESEARCH LETTERS, 47 (6). Article NonPeerReviewed 2020 ftunivliverpool https://doi.org/10.1029/2019gl086663 2023-01-19T23:52:53Z The englacial stratigraphic architecture of internal reflection horizons (IRHs) as imaged by ice-penetrating radar (IPR) across ice sheets reflects the cumulative effects of surface mass balance, basal melt, and ice flow. IRHs, considered isochrones, have typically been traced in interior, slow-flowing regions. Here, we identify three distinctive IRHs spanning the Institute and Möller catchments that cover 50% of West Antarctica's Weddell Sea Sector and are characterized by a complex system of ice stream tributaries. We place age constraints on IRHs through their intersections with previous geophysical surveys tied to Byrd Ice Core and by age-depth modeling. We further show where the oldest ice likely exists within the region and that Holocene ice-dynamic changes were limited to the catchment's lower reaches. The traced IRHs from this study have clear potential to nucleate a wider continental-scale IRH database for validating ice sheet models. Article in Journal/Newspaper Antarc* Antarctic ice core Ice Sheet Weddell Sea The University of Liverpool Repository Antarctic Byrd Weddell Weddell Sea West Antarctic Ice Sheet Geophysical Research Letters 47 6 |
institution |
Open Polar |
collection |
The University of Liverpool Repository |
op_collection_id |
ftunivliverpool |
language |
English |
description |
The englacial stratigraphic architecture of internal reflection horizons (IRHs) as imaged by ice-penetrating radar (IPR) across ice sheets reflects the cumulative effects of surface mass balance, basal melt, and ice flow. IRHs, considered isochrones, have typically been traced in interior, slow-flowing regions. Here, we identify three distinctive IRHs spanning the Institute and Möller catchments that cover 50% of West Antarctica's Weddell Sea Sector and are characterized by a complex system of ice stream tributaries. We place age constraints on IRHs through their intersections with previous geophysical surveys tied to Byrd Ice Core and by age-depth modeling. We further show where the oldest ice likely exists within the region and that Holocene ice-dynamic changes were limited to the catchment's lower reaches. The traced IRHs from this study have clear potential to nucleate a wider continental-scale IRH database for validating ice sheet models. |
format |
Article in Journal/Newspaper |
author |
Ashmore, David W Bingham, Robert G Ross, Neil Siegert, Martin Jordan, Tom A Mair, Douglas WF |
spellingShingle |
Ashmore, David W Bingham, Robert G Ross, Neil Siegert, Martin Jordan, Tom A Mair, Douglas WF Englacial Architecture and Age-Depth Constraints Across the West Antarctic Ice Sheet |
author_facet |
Ashmore, David W Bingham, Robert G Ross, Neil Siegert, Martin Jordan, Tom A Mair, Douglas WF |
author_sort |
Ashmore, David W |
title |
Englacial Architecture and Age-Depth Constraints Across the West Antarctic Ice Sheet |
title_short |
Englacial Architecture and Age-Depth Constraints Across the West Antarctic Ice Sheet |
title_full |
Englacial Architecture and Age-Depth Constraints Across the West Antarctic Ice Sheet |
title_fullStr |
Englacial Architecture and Age-Depth Constraints Across the West Antarctic Ice Sheet |
title_full_unstemmed |
Englacial Architecture and Age-Depth Constraints Across the West Antarctic Ice Sheet |
title_sort |
englacial architecture and age-depth constraints across the west antarctic ice sheet |
publisher |
American Geophysical Union (AGU) |
publishDate |
2020 |
url |
http://livrepository.liverpool.ac.uk/3077420/ https://doi.org/10.1029/2019gl086663 http://livrepository.liverpool.ac.uk/3077420/1/2020_ashmore_GRL.pdf |
geographic |
Antarctic Byrd Weddell Weddell Sea West Antarctic Ice Sheet |
geographic_facet |
Antarctic Byrd Weddell Weddell Sea West Antarctic Ice Sheet |
genre |
Antarc* Antarctic ice core Ice Sheet Weddell Sea |
genre_facet |
Antarc* Antarctic ice core Ice Sheet Weddell Sea |
op_relation |
http://livrepository.liverpool.ac.uk/3077420/1/2020_ashmore_GRL.pdf Ashmore, David W orcid:0000-0003-4829-7854 , Bingham, Robert G, Ross, Neil, Siegert, Martin, Jordan, Tom A and Mair, Douglas WF orcid:0000-0001-7009-5461 (2020) Englacial Architecture and Age-Depth Constraints Across the West Antarctic Ice Sheet. GEOPHYSICAL RESEARCH LETTERS, 47 (6). |
op_doi |
https://doi.org/10.1029/2019gl086663 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
6 |
_version_ |
1766256218241761280 |