Evidence for a large surface ablation zone in central East Antarctica during the last Ice Age
Internal isochronous ice sheet layers, recorded by airborne ice-penetrating radar, were measured along an ice flowline across a large (> I km high) subglacial hill in the foreground of the Transantarctic Mountains. The layers, dated through an existing stratigraphic link with the Vostok ice core,...
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Academic Press
2003
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Online Access: | http://nora.nerc.ac.uk/id/eprint/12978/ http://www.sciencedirect.com/science/article/pii/S0033589402000145 |
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ftnerc:oai:nora.nerc.ac.uk:12978 2023-05-15T13:45:11+02:00 Evidence for a large surface ablation zone in central East Antarctica during the last Ice Age Siegert, Martin J. Hindmarsh, Richard C.A. Hamilton, Gordon S. 2003 http://nora.nerc.ac.uk/id/eprint/12978/ http://www.sciencedirect.com/science/article/pii/S0033589402000145 unknown Academic Press Siegert, Martin J.; Hindmarsh, Richard C.A. orcid:0000-0003-1633-2416 Hamilton, Gordon S. 2003 Evidence for a large surface ablation zone in central East Antarctica during the last Ice Age. Quaternary Research, 59 (1). 114-121. https://doi.org/10.1016/S0033-5894(02)00014-5 <https://doi.org/10.1016/S0033-5894(02)00014-5> Glaciology Publication - Article PeerReviewed 2003 ftnerc https://doi.org/10.1016/S0033-5894(02)00014-5 2023-02-04T19:28:22Z Internal isochronous ice sheet layers, recorded by airborne ice-penetrating radar, were measured along an ice flowline across a large (> I km high) subglacial hill in the foreground of the Transantarctic Mountains. The layers, dated through an existing stratigraphic link with the Vostok ice core, converge with the ice surface as ice flows over the hill without noticeable change to their separation with each other or the ice base. A two-dimensional ice flow model that calculates isochrons and particle flowpaths and accounts for ice flow over the hill under steady-state conditions requires net ablation (via sublimation) over the stoss face for the predicted isochrons to match the measured internal layers. Satellite remote sensing data show no sign of exposed ancient ice at this site, however. Given the lack of exposed glacial ice, surface balance conditions must have changed recently from the net ablation that is predicted at this site for the last 85,000 years to accumulation. Article in Journal/Newspaper Antarc* Antarctica East Antarctica ice core Ice Sheet Natural Environment Research Council: NERC Open Research Archive East Antarctica Transantarctic Mountains Quaternary Research 59 1 114 121 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Glaciology |
spellingShingle |
Glaciology Siegert, Martin J. Hindmarsh, Richard C.A. Hamilton, Gordon S. Evidence for a large surface ablation zone in central East Antarctica during the last Ice Age |
topic_facet |
Glaciology |
description |
Internal isochronous ice sheet layers, recorded by airborne ice-penetrating radar, were measured along an ice flowline across a large (> I km high) subglacial hill in the foreground of the Transantarctic Mountains. The layers, dated through an existing stratigraphic link with the Vostok ice core, converge with the ice surface as ice flows over the hill without noticeable change to their separation with each other or the ice base. A two-dimensional ice flow model that calculates isochrons and particle flowpaths and accounts for ice flow over the hill under steady-state conditions requires net ablation (via sublimation) over the stoss face for the predicted isochrons to match the measured internal layers. Satellite remote sensing data show no sign of exposed ancient ice at this site, however. Given the lack of exposed glacial ice, surface balance conditions must have changed recently from the net ablation that is predicted at this site for the last 85,000 years to accumulation. |
format |
Article in Journal/Newspaper |
author |
Siegert, Martin J. Hindmarsh, Richard C.A. Hamilton, Gordon S. |
author_facet |
Siegert, Martin J. Hindmarsh, Richard C.A. Hamilton, Gordon S. |
author_sort |
Siegert, Martin J. |
title |
Evidence for a large surface ablation zone in central East Antarctica during the last Ice Age |
title_short |
Evidence for a large surface ablation zone in central East Antarctica during the last Ice Age |
title_full |
Evidence for a large surface ablation zone in central East Antarctica during the last Ice Age |
title_fullStr |
Evidence for a large surface ablation zone in central East Antarctica during the last Ice Age |
title_full_unstemmed |
Evidence for a large surface ablation zone in central East Antarctica during the last Ice Age |
title_sort |
evidence for a large surface ablation zone in central east antarctica during the last ice age |
publisher |
Academic Press |
publishDate |
2003 |
url |
http://nora.nerc.ac.uk/id/eprint/12978/ http://www.sciencedirect.com/science/article/pii/S0033589402000145 |
geographic |
East Antarctica Transantarctic Mountains |
geographic_facet |
East Antarctica Transantarctic Mountains |
genre |
Antarc* Antarctica East Antarctica ice core Ice Sheet |
genre_facet |
Antarc* Antarctica East Antarctica ice core Ice Sheet |
op_relation |
Siegert, Martin J.; Hindmarsh, Richard C.A. orcid:0000-0003-1633-2416 Hamilton, Gordon S. 2003 Evidence for a large surface ablation zone in central East Antarctica during the last Ice Age. Quaternary Research, 59 (1). 114-121. https://doi.org/10.1016/S0033-5894(02)00014-5 <https://doi.org/10.1016/S0033-5894(02)00014-5> |
op_doi |
https://doi.org/10.1016/S0033-5894(02)00014-5 |
container_title |
Quaternary Research |
container_volume |
59 |
container_issue |
1 |
container_start_page |
114 |
op_container_end_page |
121 |
_version_ |
1766215305003008000 |