Deglacial history of NW Alexander Island, Antarctica: evidence from cosmogenic 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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ftuglasgow:oai:eprints.gla.ac.uk:67520 2023-05-15T13:15:13+02:00 Deglacial history of NW Alexander Island, Antarctica: evidence from cosmogenic exposure dating Johnson, J.S. Everest, J.D. Leat, P.T. Golledge, N.R. Rood, D.H. Stuart, F.M. 2012-03 http://eprints.gla.ac.uk/67520/ unknown Johnson, J.S., Everest, J.D., Leat, P.T., Golledge, N.R., Rood, D.H. <http://eprints.gla.ac.uk/view/author/28408.html> and Stuart, F.M. <http://eprints.gla.ac.uk/view/author/5291.html> (2012) Deglacial history of NW Alexander Island, Antarctica: evidence from cosmogenic exposure dating. Quaternary Research <http://eprints.gla.ac.uk/view/journal_volume/Quaternary_Research.html>, 77(2), pp. 273-280. (doi:10.1016/j.yqres.2011.11.012 <http://dx.doi.org/10.1016/j.yqres.2011.11.012>) Articles PeerReviewed 2012 ftuglasgow https://doi.org/10.1016/j.yqres.2011.11.012 2021-09-23T22:45:47Z 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 10Be 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 10Be 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 3He 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 University of Glasgow: Enlighten - Publications Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) Antarctic Antarctic Peninsula Rothschild ENVELOPE(-72.500,-72.500,-69.417,-69.417) Rothschild Island ENVELOPE(-72.554,-72.554,-69.429,-69.429) The Antarctic Wilkins ENVELOPE(59.326,59.326,-67.248,-67.248) Wilkins Ice Shelf ENVELOPE(-72.500,-72.500,-70.416,-70.416) Quaternary Research 77 2 273 280 |
institution |
Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
unknown |
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 10Be 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 10Be 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 3He 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, J.S. Everest, J.D. Leat, P.T. Golledge, N.R. Rood, D.H. Stuart, F.M. |
spellingShingle |
Johnson, J.S. Everest, J.D. Leat, P.T. Golledge, N.R. Rood, D.H. Stuart, F.M. Deglacial history of NW Alexander Island, Antarctica: evidence from cosmogenic exposure dating |
author_facet |
Johnson, J.S. Everest, J.D. Leat, P.T. Golledge, N.R. Rood, D.H. Stuart, F.M. |
author_sort |
Johnson, J.S. |
title |
Deglacial history of NW Alexander Island, Antarctica: evidence from cosmogenic exposure dating |
title_short |
Deglacial history of NW Alexander Island, Antarctica: evidence from cosmogenic exposure dating |
title_full |
Deglacial history of NW Alexander Island, Antarctica: evidence from cosmogenic exposure dating |
title_fullStr |
Deglacial history of NW Alexander Island, Antarctica: evidence from cosmogenic exposure dating |
title_full_unstemmed |
Deglacial history of NW Alexander Island, Antarctica: evidence from cosmogenic exposure dating |
title_sort |
deglacial history of nw alexander island, antarctica: evidence from cosmogenic exposure dating |
publishDate |
2012 |
url |
http://eprints.gla.ac.uk/67520/ |
long_lat |
ENVELOPE(-69.895,-69.895,-71.287,-71.287) ENVELOPE(-72.500,-72.500,-69.417,-69.417) ENVELOPE(-72.554,-72.554,-69.429,-69.429) ENVELOPE(59.326,59.326,-67.248,-67.248) ENVELOPE(-72.500,-72.500,-70.416,-70.416) |
geographic |
Alexander Island Antarctic Antarctic Peninsula Rothschild Rothschild Island The Antarctic Wilkins Wilkins Ice Shelf |
geographic_facet |
Alexander Island Antarctic Antarctic Peninsula Rothschild Rothschild Island The Antarctic Wilkins Wilkins Ice Shelf |
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_relation |
Johnson, J.S., Everest, J.D., Leat, P.T., Golledge, N.R., Rood, D.H. <http://eprints.gla.ac.uk/view/author/28408.html> and Stuart, F.M. <http://eprints.gla.ac.uk/view/author/5291.html> (2012) Deglacial history of NW Alexander Island, Antarctica: evidence from cosmogenic exposure dating. Quaternary Research <http://eprints.gla.ac.uk/view/journal_volume/Quaternary_Research.html>, 77(2), pp. 273-280. (doi:10.1016/j.yqres.2011.11.012 <http://dx.doi.org/10.1016/j.yqres.2011.11.012>) |
op_doi |
https://doi.org/10.1016/j.yqres.2011.11.012 |
container_title |
Quaternary Research |
container_volume |
77 |
container_issue |
2 |
container_start_page |
273 |
op_container_end_page |
280 |
_version_ |
1766267552670941184 |