Geological and geomorphological insights into Antarctic ice sheet evolution
Technical advances in the study of ice-free parts of Antarctica can provide quantitative records that are useful for constraining and refining models of ice sheet evolution and behaviour. Such records improve our understanding of system trajectory, influence the questions we ask about system stabili...
Published in: | Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
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crroyalsociety:10.1098/rsta.2006.1791 2024-06-23T07:46:24+00:00 Geological and geomorphological insights into Antarctic ice sheet evolution Sugden, David E Bentley, Michael J Ó Cofaigh, Colm 2006 http://dx.doi.org/10.1098/rsta.2006.1791 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2006.1791 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsta.2006.1791 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences volume 364, issue 1844, page 1607-1625 ISSN 1364-503X 1471-2962 journal-article 2006 crroyalsociety https://doi.org/10.1098/rsta.2006.1791 2024-06-04T06:22:55Z Technical advances in the study of ice-free parts of Antarctica can provide quantitative records that are useful for constraining and refining models of ice sheet evolution and behaviour. Such records improve our understanding of system trajectory, influence the questions we ask about system stability and help to define the ice-sheet processes that are relevant on different time-scales. Here, we illustrate the contribution of cosmogenic isotope analysis of exposed bedrock surfaces and marine geophysical surveying to the understanding of Antarctic ice sheet evolution on a range of time-scales. In the Dry Valleys of East Antarctica, 3 He dating of subglacial flood deposits that are now exposed on mountain summits provide evidence of an expanded and thicker Mid-Miocene ice sheet. The survival of surface boulders for approximately 14 Myr, the oldest yet measured, demonstrates exceptionally low rates of subsequent erosion and points to the persistence and stability of the dry polar desert climate since that time. Increasingly, there are constraints on West Antarctic ice sheet fluctuations during Quaternary glacial cycles. In the Sarnoff Mountains of Marie Byrd Land in West Antarctica, 10 Be and 26 Al cosmogenic isotope analysis of glacial erratics and bedrock reveal steady thinning of the ice sheet from 10 400 years ago to the present, probably as a result of grounding line retreat. In the Antarctic Peninsula, offshore analysis reveals an extensive ice sheet at the last glacial maximum. Based on radiocarbon dating, deglaciation began by 17 000 cal yr BP and was complete by 9500 cal yr BP. Deglaciation of the west and east sides of the Antarctic Peninsula ice sheet occurred at different times and rates, but was largely complete by the Early Holocene. At that time ice shelves were less extensive on the west side of the Antarctic Peninsula than they are today. The message from the past is that individual glacier drainage basins in Antarctica respond in different and distinctive ways to global climate change, depending ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice Sheet Ice Shelves Marie Byrd Land polar desert West Antarctica The Royal Society Antarctic Antarctic Peninsula Byrd East Antarctica Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) Sarnoff Mountains ENVELOPE(-145.000,-145.000,-77.167,-77.167) The Antarctic West Antarctic Ice Sheet West Antarctica Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 364 1844 1607 1625 |
institution |
Open Polar |
collection |
The Royal Society |
op_collection_id |
crroyalsociety |
language |
English |
description |
Technical advances in the study of ice-free parts of Antarctica can provide quantitative records that are useful for constraining and refining models of ice sheet evolution and behaviour. Such records improve our understanding of system trajectory, influence the questions we ask about system stability and help to define the ice-sheet processes that are relevant on different time-scales. Here, we illustrate the contribution of cosmogenic isotope analysis of exposed bedrock surfaces and marine geophysical surveying to the understanding of Antarctic ice sheet evolution on a range of time-scales. In the Dry Valleys of East Antarctica, 3 He dating of subglacial flood deposits that are now exposed on mountain summits provide evidence of an expanded and thicker Mid-Miocene ice sheet. The survival of surface boulders for approximately 14 Myr, the oldest yet measured, demonstrates exceptionally low rates of subsequent erosion and points to the persistence and stability of the dry polar desert climate since that time. Increasingly, there are constraints on West Antarctic ice sheet fluctuations during Quaternary glacial cycles. In the Sarnoff Mountains of Marie Byrd Land in West Antarctica, 10 Be and 26 Al cosmogenic isotope analysis of glacial erratics and bedrock reveal steady thinning of the ice sheet from 10 400 years ago to the present, probably as a result of grounding line retreat. In the Antarctic Peninsula, offshore analysis reveals an extensive ice sheet at the last glacial maximum. Based on radiocarbon dating, deglaciation began by 17 000 cal yr BP and was complete by 9500 cal yr BP. Deglaciation of the west and east sides of the Antarctic Peninsula ice sheet occurred at different times and rates, but was largely complete by the Early Holocene. At that time ice shelves were less extensive on the west side of the Antarctic Peninsula than they are today. The message from the past is that individual glacier drainage basins in Antarctica respond in different and distinctive ways to global climate change, depending ... |
format |
Article in Journal/Newspaper |
author |
Sugden, David E Bentley, Michael J Ó Cofaigh, Colm |
spellingShingle |
Sugden, David E Bentley, Michael J Ó Cofaigh, Colm Geological and geomorphological insights into Antarctic ice sheet evolution |
author_facet |
Sugden, David E Bentley, Michael J Ó Cofaigh, Colm |
author_sort |
Sugden, David E |
title |
Geological and geomorphological insights into Antarctic ice sheet evolution |
title_short |
Geological and geomorphological insights into Antarctic ice sheet evolution |
title_full |
Geological and geomorphological insights into Antarctic ice sheet evolution |
title_fullStr |
Geological and geomorphological insights into Antarctic ice sheet evolution |
title_full_unstemmed |
Geological and geomorphological insights into Antarctic ice sheet evolution |
title_sort |
geological and geomorphological insights into antarctic ice sheet evolution |
publisher |
The Royal Society |
publishDate |
2006 |
url |
http://dx.doi.org/10.1098/rsta.2006.1791 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2006.1791 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsta.2006.1791 |
long_lat |
ENVELOPE(-130.000,-130.000,-78.000,-78.000) ENVELOPE(-145.000,-145.000,-77.167,-77.167) |
geographic |
Antarctic Antarctic Peninsula Byrd East Antarctica Marie Byrd Land Sarnoff Mountains The Antarctic West Antarctic Ice Sheet West Antarctica |
geographic_facet |
Antarctic Antarctic Peninsula Byrd East Antarctica Marie Byrd Land Sarnoff Mountains The Antarctic West Antarctic Ice Sheet West Antarctica |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice Sheet Ice Shelves Marie Byrd Land polar desert West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice Sheet Ice Shelves Marie Byrd Land polar desert West Antarctica |
op_source |
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences volume 364, issue 1844, page 1607-1625 ISSN 1364-503X 1471-2962 |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rsta.2006.1791 |
container_title |
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
container_volume |
364 |
container_issue |
1844 |
container_start_page |
1607 |
op_container_end_page |
1625 |
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1802645638099238912 |