Review article: Existing and potential evidence for Holocene grounding line retreat and readvance in Antarctica
Widespread existing geological records from above the modern ice sheet surface and outboard of the current ice margin show that the Antarctic Ice Sheet (AIS) was much more extensive at the Last Glacial Maximum (∼ 20 ka) than at present. However, whether it was ever smaller than present during the la...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00060852 2023-05-15T13:49:21+02:00 Review article: Existing and potential evidence for Holocene grounding line retreat and readvance in Antarctica Johnson, Joanne S. Venturelli, Ryan A. Balco, Greg Allen, Claire S. Braddock, Scott Campbell, Seth Goehring, Brent M. Hall, Brenda L. Neff, Peter D. Nichols, Keir A. Rood, Dylan H. Thomas, Elizabeth R. Woodward, John 2022-05 electronic https://doi.org/10.5194/tc-16-1543-2022 https://noa.gwlb.de/receive/cop_mods_00060852 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00060409/tc-16-1543-2022.pdf https://tc.copernicus.org/articles/16/1543/2022/tc-16-1543-2022.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-16-1543-2022 https://noa.gwlb.de/receive/cop_mods_00060852 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00060409/tc-16-1543-2022.pdf https://tc.copernicus.org/articles/16/1543/2022/tc-16-1543-2022.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/tc-16-1543-2022 2022-05-08T23:10:10Z Widespread existing geological records from above the modern ice sheet surface and outboard of the current ice margin show that the Antarctic Ice Sheet (AIS) was much more extensive at the Last Glacial Maximum (∼ 20 ka) than at present. However, whether it was ever smaller than present during the last few millennia, and (if so) by how much, is known only for a few locations because direct evidence lies within or beneath the ice sheet, which is challenging to access. Here, we describe how retreat and readvance (henceforth “readvance”) of AIS grounding lines during the Holocene could be detected and quantified using subglacial bedrock, subglacial sediments, marine sediment cores, relative sea-level (RSL) records, geodetic observations, radar data, and ice cores. Of these, only subglacial bedrock and subglacial sediments can provide direct evidence for readvance. Marine archives are of limited utility because readvance commonly covers evidence of earlier retreat. Nevertheless, stratigraphic transitions documenting change in environment may provide support for direct evidence from subglacial records, as can the presence of transgressions in RSL records, and isostatic subsidence. With independent age control, ice structure revealed by radar can be used to infer past changes in ice flow and geometry, and therefore potential readvance. Since ice cores capture changes in surface mass balance, elevation, and atmospheric and oceanic circulation that are known to drive grounding line migration, they also have potential for identifying readvance. A multidisciplinary approach is likely to provide the strongest evidence for or against a smaller-than-present AIS in the Holocene. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet The Cryosphere Niedersächsisches Online-Archiv NOA Antarctic The Antarctic The Cryosphere 16 5 1543 1562 |
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article Verlagsveröffentlichung Johnson, Joanne S. Venturelli, Ryan A. Balco, Greg Allen, Claire S. Braddock, Scott Campbell, Seth Goehring, Brent M. Hall, Brenda L. Neff, Peter D. Nichols, Keir A. Rood, Dylan H. Thomas, Elizabeth R. Woodward, John Review article: Existing and potential evidence for Holocene grounding line retreat and readvance in Antarctica |
topic_facet |
article Verlagsveröffentlichung |
description |
Widespread existing geological records from above the modern ice sheet surface and outboard of the current ice margin show that the Antarctic Ice Sheet (AIS) was much more extensive at the Last Glacial Maximum (∼ 20 ka) than at present. However, whether it was ever smaller than present during the last few millennia, and (if so) by how much, is known only for a few locations because direct evidence lies within or beneath the ice sheet, which is challenging to access. Here, we describe how retreat and readvance (henceforth “readvance”) of AIS grounding lines during the Holocene could be detected and quantified using subglacial bedrock, subglacial sediments, marine sediment cores, relative sea-level (RSL) records, geodetic observations, radar data, and ice cores. Of these, only subglacial bedrock and subglacial sediments can provide direct evidence for readvance. Marine archives are of limited utility because readvance commonly covers evidence of earlier retreat. Nevertheless, stratigraphic transitions documenting change in environment may provide support for direct evidence from subglacial records, as can the presence of transgressions in RSL records, and isostatic subsidence. With independent age control, ice structure revealed by radar can be used to infer past changes in ice flow and geometry, and therefore potential readvance. Since ice cores capture changes in surface mass balance, elevation, and atmospheric and oceanic circulation that are known to drive grounding line migration, they also have potential for identifying readvance. A multidisciplinary approach is likely to provide the strongest evidence for or against a smaller-than-present AIS in the Holocene. |
format |
Article in Journal/Newspaper |
author |
Johnson, Joanne S. Venturelli, Ryan A. Balco, Greg Allen, Claire S. Braddock, Scott Campbell, Seth Goehring, Brent M. Hall, Brenda L. Neff, Peter D. Nichols, Keir A. Rood, Dylan H. Thomas, Elizabeth R. Woodward, John |
author_facet |
Johnson, Joanne S. Venturelli, Ryan A. Balco, Greg Allen, Claire S. Braddock, Scott Campbell, Seth Goehring, Brent M. Hall, Brenda L. Neff, Peter D. Nichols, Keir A. Rood, Dylan H. Thomas, Elizabeth R. Woodward, John |
author_sort |
Johnson, Joanne S. |
title |
Review article: Existing and potential evidence for Holocene grounding line retreat and readvance in Antarctica |
title_short |
Review article: Existing and potential evidence for Holocene grounding line retreat and readvance in Antarctica |
title_full |
Review article: Existing and potential evidence for Holocene grounding line retreat and readvance in Antarctica |
title_fullStr |
Review article: Existing and potential evidence for Holocene grounding line retreat and readvance in Antarctica |
title_full_unstemmed |
Review article: Existing and potential evidence for Holocene grounding line retreat and readvance in Antarctica |
title_sort |
review article: existing and potential evidence for holocene grounding line retreat and readvance in antarctica |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-1543-2022 https://noa.gwlb.de/receive/cop_mods_00060852 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00060409/tc-16-1543-2022.pdf https://tc.copernicus.org/articles/16/1543/2022/tc-16-1543-2022.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-16-1543-2022 https://noa.gwlb.de/receive/cop_mods_00060852 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00060409/tc-16-1543-2022.pdf https://tc.copernicus.org/articles/16/1543/2022/tc-16-1543-2022.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-16-1543-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
5 |
container_start_page |
1543 |
op_container_end_page |
1562 |
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1766251223520903168 |