Evidence for a large surface ablation zone in central East Antarctica during the last Ice Age
Abstract Internal isochronous ice sheet layers, recorded by airborne ice-penetrating radar, were measured along an ice flowline across a large (>1 km high) subglacial hill in the foreground of the Transantarctic Mountains. The layers, dated through an existing stratigraphic link with the Vostok i...
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crcambridgeupr:10.1016/s0033-5894(02)00014-5 2024-06-23T07:46:22+00:00 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://dx.doi.org/10.1016/s0033-5894(02)00014-5 http://api.elsevier.com/content/article/PII:S0033589402000145?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589402000145?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940001173X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 59, issue 1, page 114-121 ISSN 0033-5894 1096-0287 journal-article 2003 crcambridgeupr https://doi.org/10.1016/s0033-5894(02)00014-5 2024-06-05T04:04:42Z Abstract Internal isochronous ice sheet layers, recorded by airborne ice-penetrating radar, were measured along an ice flowline across a large (>1 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 Cambridge University Press East Antarctica Transantarctic Mountains Quaternary Research 59 1 114 121 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Internal isochronous ice sheet layers, recorded by airborne ice-penetrating radar, were measured along an ice flowline across a large (>1 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. |
spellingShingle |
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 |
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 |
Cambridge University Press (CUP) |
publishDate |
2003 |
url |
http://dx.doi.org/10.1016/s0033-5894(02)00014-5 http://api.elsevier.com/content/article/PII:S0033589402000145?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589402000145?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940001173X |
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_source |
Quaternary Research volume 59, issue 1, page 114-121 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/s0033-5894(02)00014-5 |
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Quaternary Research |
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59 |
container_issue |
1 |
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114 |
op_container_end_page |
121 |
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1802645520828596224 |