The deglacial history of NW Alexander Island, Antarctica, from surface exposure dating
Recent changes along the margins of the Antarctic Peninsula, such as the collapse of the Wilkins Ice Shelf, have highlighted the effects of climatic warming on the Antarctic Peninsula Ice Sheet (APIS). However, such changes must be viewed in a long-term (millennial-scale) context if we are to unders...
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Cambridge University Press (CUP)
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crcambridgeupr:10.1016/j.yqres.2011.11.012 2024-06-09T07:38:07+00:00 The deglacial history of NW Alexander Island, Antarctica, from surface exposure dating Johnson, Joanne S. Everest, Jeremy D. Leat, Philip T. Golledge, Nicholas R. Rood, Dylan H. Stuart, Finlay M. 2012 http://dx.doi.org/10.1016/j.yqres.2011.11.012 http://api.elsevier.com/content/article/PII:S0033589411001517?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589411001517?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400003914 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 77, issue 2, page 273-280 ISSN 0033-5894 1096-0287 journal-article 2012 crcambridgeupr https://doi.org/10.1016/j.yqres.2011.11.012 2024-05-15T13:10:28Z Recent changes along the margins of the Antarctic Peninsula, such as the collapse of the Wilkins Ice Shelf, have highlighted the effects of climatic warming on the Antarctic Peninsula Ice Sheet (APIS). However, such changes must be viewed in a long-term (millennial-scale) context if we are to understand their significance for future stability of the Antarctic ice sheets. To address this, we present nine new cosmogenic 10 Be exposure ages from sites on NW Alexander Island and Rothschild Island (adjacent to the Wilkins Ice Shelf) that provide constraints on the timing of thinning of the Alexander Island ice cap since the last glacial maximum. All but one of the 10 Be ages are in the range 10.2–21.7 ka, showing a general trend of progressive ice-sheet thinning since at least 22 ka until 10 ka. The data also provide a minimum estimate (490 m) for ice-cap thickness on NW Alexander Island at the last glacial maximum. Cosmogenic 3 He ages from a rare occurrence of mantle xenoliths on Rothschild Island yield variable ages up to 46 ka, probably reflecting exhumation by periglacial processes. Article in Journal/Newspaper Alexander Island Antarc* Antarctic Antarctic Peninsula Antarctica Ice cap Ice Sheet Ice Shelf Rothschild Island Wilkins Ice Shelf Cambridge University Press Antarctic The Antarctic Antarctic Peninsula Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) Wilkins ENVELOPE(59.326,59.326,-67.248,-67.248) Wilkins Ice Shelf ENVELOPE(-72.500,-72.500,-70.416,-70.416) Rothschild ENVELOPE(-72.500,-72.500,-69.417,-69.417) Rothschild Island ENVELOPE(-72.554,-72.554,-69.429,-69.429) Quaternary Research 77 2 273 280 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Recent changes along the margins of the Antarctic Peninsula, such as the collapse of the Wilkins Ice Shelf, have highlighted the effects of climatic warming on the Antarctic Peninsula Ice Sheet (APIS). However, such changes must be viewed in a long-term (millennial-scale) context if we are to understand their significance for future stability of the Antarctic ice sheets. To address this, we present nine new cosmogenic 10 Be exposure ages from sites on NW Alexander Island and Rothschild Island (adjacent to the Wilkins Ice Shelf) that provide constraints on the timing of thinning of the Alexander Island ice cap since the last glacial maximum. All but one of the 10 Be ages are in the range 10.2–21.7 ka, showing a general trend of progressive ice-sheet thinning since at least 22 ka until 10 ka. The data also provide a minimum estimate (490 m) for ice-cap thickness on NW Alexander Island at the last glacial maximum. Cosmogenic 3 He ages from a rare occurrence of mantle xenoliths on Rothschild Island yield variable ages up to 46 ka, probably reflecting exhumation by periglacial processes. |
format |
Article in Journal/Newspaper |
author |
Johnson, Joanne S. Everest, Jeremy D. Leat, Philip T. Golledge, Nicholas R. Rood, Dylan H. Stuart, Finlay M. |
spellingShingle |
Johnson, Joanne S. Everest, Jeremy D. Leat, Philip T. Golledge, Nicholas R. Rood, Dylan H. Stuart, Finlay M. The deglacial history of NW Alexander Island, Antarctica, from surface exposure dating |
author_facet |
Johnson, Joanne S. Everest, Jeremy D. Leat, Philip T. Golledge, Nicholas R. Rood, Dylan H. Stuart, Finlay M. |
author_sort |
Johnson, Joanne S. |
title |
The deglacial history of NW Alexander Island, Antarctica, from surface exposure dating |
title_short |
The deglacial history of NW Alexander Island, Antarctica, from surface exposure dating |
title_full |
The deglacial history of NW Alexander Island, Antarctica, from surface exposure dating |
title_fullStr |
The deglacial history of NW Alexander Island, Antarctica, from surface exposure dating |
title_full_unstemmed |
The deglacial history of NW Alexander Island, Antarctica, from surface exposure dating |
title_sort |
deglacial history of nw alexander island, antarctica, from surface exposure dating |
publisher |
Cambridge University Press (CUP) |
publishDate |
2012 |
url |
http://dx.doi.org/10.1016/j.yqres.2011.11.012 http://api.elsevier.com/content/article/PII:S0033589411001517?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589411001517?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400003914 |
long_lat |
ENVELOPE(-69.895,-69.895,-71.287,-71.287) ENVELOPE(59.326,59.326,-67.248,-67.248) ENVELOPE(-72.500,-72.500,-70.416,-70.416) ENVELOPE(-72.500,-72.500,-69.417,-69.417) ENVELOPE(-72.554,-72.554,-69.429,-69.429) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Alexander Island Wilkins Wilkins Ice Shelf Rothschild Rothschild Island |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Alexander Island Wilkins Wilkins Ice Shelf Rothschild Rothschild Island |
genre |
Alexander Island Antarc* Antarctic Antarctic Peninsula Antarctica Ice cap Ice Sheet Ice Shelf Rothschild Island Wilkins Ice Shelf |
genre_facet |
Alexander Island Antarc* Antarctic Antarctic Peninsula Antarctica Ice cap Ice Sheet Ice Shelf Rothschild Island Wilkins Ice Shelf |
op_source |
Quaternary Research volume 77, issue 2, page 273-280 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/j.yqres.2011.11.012 |
container_title |
Quaternary Research |
container_volume |
77 |
container_issue |
2 |
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273 |
op_container_end_page |
280 |
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1801370582242033664 |