Glacio-isostasy and Glacial Ice Load at Law Dome, Wilkes Land, East Antarctica
Abstract The Holocene sea-level high stand or “marine limit” in Wilkes Land, East Antarctica, reached ∼30 m above present sea level at a few dispersed sites. The most detailed marine limit data have been recorded for the Windmill Islands and Budd Coast at the margin of the Law Dome ice cap, a dome o...
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Cambridge University Press (CUP)
2000
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Online Access: | http://dx.doi.org/10.1006/qres.1999.2125 http://api.elsevier.com/content/article/PII:S0033589499921257?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589499921257?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400030763 |
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crcambridgeupr:10.1006/qres.1999.2125 2024-06-09T07:40:22+00:00 Glacio-isostasy and Glacial Ice Load at Law Dome, Wilkes Land, East Antarctica Goodwin, Ian D. Zweck, Christopher 2000 http://dx.doi.org/10.1006/qres.1999.2125 http://api.elsevier.com/content/article/PII:S0033589499921257?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589499921257?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400030763 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 53, issue 3, page 285-293 ISSN 0033-5894 1096-0287 journal-article 2000 crcambridgeupr https://doi.org/10.1006/qres.1999.2125 2024-05-15T13:09:29Z Abstract The Holocene sea-level high stand or “marine limit” in Wilkes Land, East Antarctica, reached ∼30 m above present sea level at a few dispersed sites. The most detailed marine limit data have been recorded for the Windmill Islands and Budd Coast at the margin of the Law Dome ice cap, a dome of the East Antarctic Ice Sheet (EAIS). Relative sea-level lowering of 30 m and the associated emergence of the Windmill Islands have occurred since 6900 14 C (corr.) yr B.P. Numerical modeling of the Earth's rheology is used to determine the glacio-isostatic component of the observed relative sea-level lowering. Glaciological evidence suggests that most of EAIS thickening occurred around its margin, with expansion onto the continental shelf. Consequently, a regional ice history for the last glacial maximum (LGM) was applied in the glacio-isostatic modeling to test whether the observed relative sea-level lowering was primarily produced by regional ice-sheet changes. The results of the modeling indicate that the postglacial (13,000 to 8000 14 C yr B.P) removal of an ice load of between 770 and 1000 m from around the margin of the Law Dome and adjacent EAIS have produced the observed relative sea-level lowering. Such an additional ice load would have been associated with a 40- to 65-km expansion of the Law Dome to near the continental shelf break, together with a few hundred meters of ice thickening on the adjoining coastal slope of the EAIS up to 2000 m elevation. Whereas the observed changes in relative sea level are shown to be strongly influenced by regional ice sheet changes, the glacio-isostatic response at the Windmill Islands results from a combination of regional and to a lesser extent, Antarctic-wide effects. The correspondence between the Holocene relative sea-level lowering interpreted at the margin of the Law Dome and the lowering interpreted along the remainder of the Wilkes Land and Oates Land coasts (105°–160° E) suggests that a similar ice load of up to 1000 m existed along the EAIS margin between Wilkes ... Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice cap Ice Sheet Oates Land Wilkes Land Windmill Islands Cambridge University Press Antarctic Budd Coast ENVELOPE(112.000,112.000,-66.500,-66.500) East Antarctic Ice Sheet East Antarctica Law Dome ENVELOPE(112.833,112.833,-66.733,-66.733) Oates Land ENVELOPE(158.000,158.000,-70.000,-70.000) Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Windmill Islands ENVELOPE(110.417,110.417,-66.350,-66.350) Quaternary Research 53 3 285 293 |
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Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract The Holocene sea-level high stand or “marine limit” in Wilkes Land, East Antarctica, reached ∼30 m above present sea level at a few dispersed sites. The most detailed marine limit data have been recorded for the Windmill Islands and Budd Coast at the margin of the Law Dome ice cap, a dome of the East Antarctic Ice Sheet (EAIS). Relative sea-level lowering of 30 m and the associated emergence of the Windmill Islands have occurred since 6900 14 C (corr.) yr B.P. Numerical modeling of the Earth's rheology is used to determine the glacio-isostatic component of the observed relative sea-level lowering. Glaciological evidence suggests that most of EAIS thickening occurred around its margin, with expansion onto the continental shelf. Consequently, a regional ice history for the last glacial maximum (LGM) was applied in the glacio-isostatic modeling to test whether the observed relative sea-level lowering was primarily produced by regional ice-sheet changes. The results of the modeling indicate that the postglacial (13,000 to 8000 14 C yr B.P) removal of an ice load of between 770 and 1000 m from around the margin of the Law Dome and adjacent EAIS have produced the observed relative sea-level lowering. Such an additional ice load would have been associated with a 40- to 65-km expansion of the Law Dome to near the continental shelf break, together with a few hundred meters of ice thickening on the adjoining coastal slope of the EAIS up to 2000 m elevation. Whereas the observed changes in relative sea level are shown to be strongly influenced by regional ice sheet changes, the glacio-isostatic response at the Windmill Islands results from a combination of regional and to a lesser extent, Antarctic-wide effects. The correspondence between the Holocene relative sea-level lowering interpreted at the margin of the Law Dome and the lowering interpreted along the remainder of the Wilkes Land and Oates Land coasts (105°–160° E) suggests that a similar ice load of up to 1000 m existed along the EAIS margin between Wilkes ... |
format |
Article in Journal/Newspaper |
author |
Goodwin, Ian D. Zweck, Christopher |
spellingShingle |
Goodwin, Ian D. Zweck, Christopher Glacio-isostasy and Glacial Ice Load at Law Dome, Wilkes Land, East Antarctica |
author_facet |
Goodwin, Ian D. Zweck, Christopher |
author_sort |
Goodwin, Ian D. |
title |
Glacio-isostasy and Glacial Ice Load at Law Dome, Wilkes Land, East Antarctica |
title_short |
Glacio-isostasy and Glacial Ice Load at Law Dome, Wilkes Land, East Antarctica |
title_full |
Glacio-isostasy and Glacial Ice Load at Law Dome, Wilkes Land, East Antarctica |
title_fullStr |
Glacio-isostasy and Glacial Ice Load at Law Dome, Wilkes Land, East Antarctica |
title_full_unstemmed |
Glacio-isostasy and Glacial Ice Load at Law Dome, Wilkes Land, East Antarctica |
title_sort |
glacio-isostasy and glacial ice load at law dome, wilkes land, east antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
2000 |
url |
http://dx.doi.org/10.1006/qres.1999.2125 http://api.elsevier.com/content/article/PII:S0033589499921257?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589499921257?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400030763 |
long_lat |
ENVELOPE(112.000,112.000,-66.500,-66.500) ENVELOPE(112.833,112.833,-66.733,-66.733) ENVELOPE(158.000,158.000,-70.000,-70.000) ENVELOPE(120.000,120.000,-69.000,-69.000) ENVELOPE(110.417,110.417,-66.350,-66.350) |
geographic |
Antarctic Budd Coast East Antarctic Ice Sheet East Antarctica Law Dome Oates Land Wilkes Land Windmill Islands |
geographic_facet |
Antarctic Budd Coast East Antarctic Ice Sheet East Antarctica Law Dome Oates Land Wilkes Land Windmill Islands |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice cap Ice Sheet Oates Land Wilkes Land Windmill Islands |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice cap Ice Sheet Oates Land Wilkes Land Windmill Islands |
op_source |
Quaternary Research volume 53, issue 3, page 285-293 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1006/qres.1999.2125 |
container_title |
Quaternary Research |
container_volume |
53 |
container_issue |
3 |
container_start_page |
285 |
op_container_end_page |
293 |
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1801383781361254400 |