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Antarctic ice volume and contribution to sea-level fall at 20,000 yr BP from raised beaches
THE contribution of the Antarctic ice sheets to global sea-level fall at the Last Glacial Maximum (LGM) depends largely on how the extent and thickness of peripheral ice changed. Model studies 1–3 suggest that there was widespread thickening (from 500 m to more than 1,000 m) of the ice-sheet margins...
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| Published in: | Nature (London) 1992-07, Vol.358 (6384), p.316-319 |
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| container_end_page | 319 |
| container_issue | 6384 |
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| container_title | Nature (London) |
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| creator | Colhoun, E. A Mabin, M. C. G Adamson, D. A Kirk, R. M |
| description | THE contribution of the Antarctic ice sheets to global sea-level fall at the Last Glacial Maximum (LGM) depends largely on how the extent and thickness of peripheral ice changed. Model studies
1–3
suggest that there was widespread thickening (from 500 m to more than 1,000 m) of the ice-sheet margins, sufficient to induce a drop in sea level of at least 25 m. Geological evidence
4,5
, on the other hand, indicates only limited ice expansion and a sea-level fall of just 8 m. Here we use recent data on the altitudes and ages of raised beaches from the Ross embayment and East Antarctica to investigate the timing and extent of Antarctic deglaciation. These indicate that the ice margin during the LGM was thinner and less extensive than has been formerly thought, and that its contribution to the drop in sea level was only 0.5–2.5 m. Deglaciation was well advanced by 10 kyr BP and was complete by 6 kyr BP. These findings imply either that sea level during the LGM fell less than present estimates suggest, or that an ice volume considerably greater than currently accepted must have been present in the Northern Hemisphere. |
| doi_str_mv | 10.1038/358316a0 |
| format | article |
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1–3
suggest that there was widespread thickening (from 500 m to more than 1,000 m) of the ice-sheet margins, sufficient to induce a drop in sea level of at least 25 m. Geological evidence
4,5
, on the other hand, indicates only limited ice expansion and a sea-level fall of just 8 m. Here we use recent data on the altitudes and ages of raised beaches from the Ross embayment and East Antarctica to investigate the timing and extent of Antarctic deglaciation. These indicate that the ice margin during the LGM was thinner and less extensive than has been formerly thought, and that its contribution to the drop in sea level was only 0.5–2.5 m. Deglaciation was well advanced by 10 kyr BP and was complete by 6 kyr BP. These findings imply either that sea level during the LGM fell less than present estimates suggest, or that an ice volume considerably greater than currently accepted must have been present in the Northern Hemisphere.</description><identifier>ISSN: 0028-0836</identifier><identifier>EISSN: 1476-4687</identifier><identifier>DOI: 10.1038/358316a0</identifier><identifier>CODEN: NATUAS</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>Beaches ; Deglaciation ; Glaciers ; Humanities and Social Sciences ; Ice ; letter ; Marine ; multidisciplinary ; Science ; Science (multidisciplinary) ; Sea level</subject><ispartof>Nature (London), 1992-07, Vol.358 (6384), p.316-319</ispartof><rights>Springer Nature Limited 1992</rights><rights>Copyright Macmillan Journals Ltd. Jul 23, 1992</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a491t-7430387579f23586d8bc295820cf5b1804878e3458eff2e8fe64330be921d4df3</citedby><cites>FETCH-LOGICAL-a491t-7430387579f23586d8bc295820cf5b1804878e3458eff2e8fe64330be921d4df3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,2727,27924,27925</link.rule.ids></links><search><creatorcontrib>Colhoun, E. A</creatorcontrib><creatorcontrib>Mabin, M. C. G</creatorcontrib><creatorcontrib>Adamson, D. A</creatorcontrib><creatorcontrib>Kirk, R. M</creatorcontrib><title>Antarctic ice volume and contribution to sea-level fall at 20,000 yr BP from raised beaches</title><title>Nature (London)</title><addtitle>Nature</addtitle><description>THE contribution of the Antarctic ice sheets to global sea-level fall at the Last Glacial Maximum (LGM) depends largely on how the extent and thickness of peripheral ice changed. Model studies
1–3
suggest that there was widespread thickening (from 500 m to more than 1,000 m) of the ice-sheet margins, sufficient to induce a drop in sea level of at least 25 m. Geological evidence
4,5
, on the other hand, indicates only limited ice expansion and a sea-level fall of just 8 m. Here we use recent data on the altitudes and ages of raised beaches from the Ross embayment and East Antarctica to investigate the timing and extent of Antarctic deglaciation. These indicate that the ice margin during the LGM was thinner and less extensive than has been formerly thought, and that its contribution to the drop in sea level was only 0.5–2.5 m. Deglaciation was well advanced by 10 kyr BP and was complete by 6 kyr BP. These findings imply either that sea level during the LGM fell less than present estimates suggest, or that an ice volume considerably greater than currently accepted must have been present in the Northern Hemisphere.</description><subject>Beaches</subject><subject>Deglaciation</subject><subject>Glaciers</subject><subject>Humanities and Social Sciences</subject><subject>Ice</subject><subject>letter</subject><subject>Marine</subject><subject>multidisciplinary</subject><subject>Science</subject><subject>Science (multidisciplinary)</subject><subject>Sea level</subject><issn>0028-0836</issn><issn>1476-4687</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1992</creationdate><recordtype>article</recordtype><recordid>eNqF0UtLxDAUBeAgCo4P8BdIcCEKVvNqklmO4gsEXejKRUnTG610mjFJB-bfGxkfIMKs7ubjcC4HoT1KTinh-oyXmlNpyBoaUaFkIaRW62hECNMF0Vxuoq0Y3wghJVVihJ4nfTLBptbi1gKe-26YAjZ9g63vU2jrIbW-x8njCKboYA4ddqbrsEmYkZOcgxcBnz9gF_wUB9NGaHANxr5C3EEbmUbY_brb6Onq8vHipri7v769mNwVRoxpKpTgubgq1dix3F42urZsXGpGrCtrqonQSgMXpQbnGGgHUnBOahgz2ojG8W10uMydBf8-QEzVtI0Wus704IdYsVIpIUuyElLNuKRcr4aSCZVbZXjwB775IfT524oRIQQTXGZ0tEQ2-BgDuGoW2qkJi4qS6nO06nu0TI-XNGbSv0D4zfvH7i9tb9IQ4Cf0B3wAp4ycrg</recordid><startdate>19920723</startdate><enddate>19920723</enddate><creator>Colhoun, E. 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A</au><au>Mabin, M. C. G</au><au>Adamson, D. A</au><au>Kirk, R. M</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Antarctic ice volume and contribution to sea-level fall at 20,000 yr BP from raised beaches</atitle><jtitle>Nature (London)</jtitle><stitle>Nature</stitle><date>1992-07-23</date><risdate>1992</risdate><volume>358</volume><issue>6384</issue><spage>316</spage><epage>319</epage><pages>316-319</pages><issn>0028-0836</issn><eissn>1476-4687</eissn><coden>NATUAS</coden><abstract>THE contribution of the Antarctic ice sheets to global sea-level fall at the Last Glacial Maximum (LGM) depends largely on how the extent and thickness of peripheral ice changed. Model studies
1–3
suggest that there was widespread thickening (from 500 m to more than 1,000 m) of the ice-sheet margins, sufficient to induce a drop in sea level of at least 25 m. Geological evidence
4,5
, on the other hand, indicates only limited ice expansion and a sea-level fall of just 8 m. Here we use recent data on the altitudes and ages of raised beaches from the Ross embayment and East Antarctica to investigate the timing and extent of Antarctic deglaciation. These indicate that the ice margin during the LGM was thinner and less extensive than has been formerly thought, and that its contribution to the drop in sea level was only 0.5–2.5 m. Deglaciation was well advanced by 10 kyr BP and was complete by 6 kyr BP. These findings imply either that sea level during the LGM fell less than present estimates suggest, or that an ice volume considerably greater than currently accepted must have been present in the Northern Hemisphere.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><doi>10.1038/358316a0</doi><tpages>4</tpages></addata></record> |
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| ispartof | Nature (London), 1992-07, Vol.358 (6384), p.316-319 |
| issn | 0028-0836 1476-4687 |
| language | eng |
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| source | Nature |
| subjects | Beaches Deglaciation Glaciers Humanities and Social Sciences Ice letter Marine multidisciplinary Science Science (multidisciplinary) Sea level |
| title | Antarctic ice volume and contribution to sea-level fall at 20,000 yr BP from raised beaches |
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