Age determination for sediment cores from the Amundsen Sea Embayment, supplement to: Smith, James A; Hillenbrand, Claus-Dieter; Kuhn, Gerhard; Klages, Johann Philipp; Graham, Alastair G C; Larter, Robert D; Ehrmann, Werner; Moreton, Steven Grahame; Wiers, Steffen; Frederichs, Thomas (2014): New constraints on the timing of West Antarctic Ice Sheet retreat in the eastern Amundsen Sea since the Last Glacial Maximum. Global and Planetary Change, 122, 224-237
Glaciers flowing into the Amundsen Sea Embayment (ASE) account for > 35% of the total discharge of the West Antarctic Ice Sheet (WAIS) and have thinned and retreated dramatically over the past two decades. Here we present detailed marine geological data and an extensive new radiocarbon dataset fr...
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Online Access: | https://dx.doi.org/10.1594/pangaea.835462 https://doi.pangaea.de/10.1594/PANGAEA.835462 |
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ftdatacite:10.1594/pangaea.835462 2023-05-15T13:23:50+02:00 Age determination for sediment cores from the Amundsen Sea Embayment, supplement to: Smith, James A; Hillenbrand, Claus-Dieter; Kuhn, Gerhard; Klages, Johann Philipp; Graham, Alastair G C; Larter, Robert D; Ehrmann, Werner; Moreton, Steven Grahame; Wiers, Steffen; Frederichs, Thomas (2014): New constraints on the timing of West Antarctic Ice Sheet retreat in the eastern Amundsen Sea since the Last Glacial Maximum. Global and Planetary Change, 122, 224-237 Smith, James A Hillenbrand, Claus-Dieter Kuhn, Gerhard Klages, Johann Philipp Graham, Alastair G C Larter, Robert D Ehrmann, Werner Moreton, Steven Grahame Wiers, Steffen Frederichs, Thomas 2014 application/zip https://dx.doi.org/10.1594/pangaea.835462 https://doi.pangaea.de/10.1594/PANGAEA.835462 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/j.gloplacha.2014.07.015 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY article Supplementary Collection of Datasets Collection 2014 ftdatacite https://doi.org/10.1594/pangaea.835462 https://doi.org/10.1016/j.gloplacha.2014.07.015 2022-02-09T13:36:03Z Glaciers flowing into the Amundsen Sea Embayment (ASE) account for > 35% of the total discharge of the West Antarctic Ice Sheet (WAIS) and have thinned and retreated dramatically over the past two decades. Here we present detailed marine geological data and an extensive new radiocarbon dataset from the eastern ASE in order to constrain the retreat of the WAIS since the Last Glacial Maximum (LGM) and assess the significance of these recent changes. Our dating approach, relying mainly on the acid insoluble organic (AIO) fraction, utilises multi-proxy analyses of the sediments to characterise their lithofacies and determine the horizon in each core that would yield the most reliable age for deglaciation. In total, we dated 69 samples and show that deglaciation of the outer shelf was underway before 20,600 calibrated years before present (cal. yr BP), reaching the mid-shelf by 13,575 cal. yr BP and the inner shelf to within c.150 km of the present grounding line by 10,615 cal. yr BP. The timing of retreat is broadly consistent with previously published radiocarbon dates on biogenic carbonate from the eastern ASE as well as AIO 14C ages from the western ASE and provides new constraints for ice sheet models. The overall retreat trajectory - slow on the outer shelf, more rapid from the middle to inner shelf - clearly highlights the importance of reverse bedslopes in controlling phases of accelerated groundling line retreat. Despite revealing these broad scale trends, the current dataset does not capture detailed changes in ice flow, such as stillstands during grounding line retreat (i.e., deposition of grounding zone wedges) and possible readvances as depicted in the geomorphological record. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) Antarctic Amundsen Sea West Antarctic Ice Sheet Moreton ENVELOPE(-46.033,-46.033,-60.616,-60.616) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
description |
Glaciers flowing into the Amundsen Sea Embayment (ASE) account for > 35% of the total discharge of the West Antarctic Ice Sheet (WAIS) and have thinned and retreated dramatically over the past two decades. Here we present detailed marine geological data and an extensive new radiocarbon dataset from the eastern ASE in order to constrain the retreat of the WAIS since the Last Glacial Maximum (LGM) and assess the significance of these recent changes. Our dating approach, relying mainly on the acid insoluble organic (AIO) fraction, utilises multi-proxy analyses of the sediments to characterise their lithofacies and determine the horizon in each core that would yield the most reliable age for deglaciation. In total, we dated 69 samples and show that deglaciation of the outer shelf was underway before 20,600 calibrated years before present (cal. yr BP), reaching the mid-shelf by 13,575 cal. yr BP and the inner shelf to within c.150 km of the present grounding line by 10,615 cal. yr BP. The timing of retreat is broadly consistent with previously published radiocarbon dates on biogenic carbonate from the eastern ASE as well as AIO 14C ages from the western ASE and provides new constraints for ice sheet models. The overall retreat trajectory - slow on the outer shelf, more rapid from the middle to inner shelf - clearly highlights the importance of reverse bedslopes in controlling phases of accelerated groundling line retreat. Despite revealing these broad scale trends, the current dataset does not capture detailed changes in ice flow, such as stillstands during grounding line retreat (i.e., deposition of grounding zone wedges) and possible readvances as depicted in the geomorphological record. |
format |
Article in Journal/Newspaper |
author |
Smith, James A Hillenbrand, Claus-Dieter Kuhn, Gerhard Klages, Johann Philipp Graham, Alastair G C Larter, Robert D Ehrmann, Werner Moreton, Steven Grahame Wiers, Steffen Frederichs, Thomas |
spellingShingle |
Smith, James A Hillenbrand, Claus-Dieter Kuhn, Gerhard Klages, Johann Philipp Graham, Alastair G C Larter, Robert D Ehrmann, Werner Moreton, Steven Grahame Wiers, Steffen Frederichs, Thomas Age determination for sediment cores from the Amundsen Sea Embayment, supplement to: Smith, James A; Hillenbrand, Claus-Dieter; Kuhn, Gerhard; Klages, Johann Philipp; Graham, Alastair G C; Larter, Robert D; Ehrmann, Werner; Moreton, Steven Grahame; Wiers, Steffen; Frederichs, Thomas (2014): New constraints on the timing of West Antarctic Ice Sheet retreat in the eastern Amundsen Sea since the Last Glacial Maximum. Global and Planetary Change, 122, 224-237 |
author_facet |
Smith, James A Hillenbrand, Claus-Dieter Kuhn, Gerhard Klages, Johann Philipp Graham, Alastair G C Larter, Robert D Ehrmann, Werner Moreton, Steven Grahame Wiers, Steffen Frederichs, Thomas |
author_sort |
Smith, James A |
title |
Age determination for sediment cores from the Amundsen Sea Embayment, supplement to: Smith, James A; Hillenbrand, Claus-Dieter; Kuhn, Gerhard; Klages, Johann Philipp; Graham, Alastair G C; Larter, Robert D; Ehrmann, Werner; Moreton, Steven Grahame; Wiers, Steffen; Frederichs, Thomas (2014): New constraints on the timing of West Antarctic Ice Sheet retreat in the eastern Amundsen Sea since the Last Glacial Maximum. Global and Planetary Change, 122, 224-237 |
title_short |
Age determination for sediment cores from the Amundsen Sea Embayment, supplement to: Smith, James A; Hillenbrand, Claus-Dieter; Kuhn, Gerhard; Klages, Johann Philipp; Graham, Alastair G C; Larter, Robert D; Ehrmann, Werner; Moreton, Steven Grahame; Wiers, Steffen; Frederichs, Thomas (2014): New constraints on the timing of West Antarctic Ice Sheet retreat in the eastern Amundsen Sea since the Last Glacial Maximum. Global and Planetary Change, 122, 224-237 |
title_full |
Age determination for sediment cores from the Amundsen Sea Embayment, supplement to: Smith, James A; Hillenbrand, Claus-Dieter; Kuhn, Gerhard; Klages, Johann Philipp; Graham, Alastair G C; Larter, Robert D; Ehrmann, Werner; Moreton, Steven Grahame; Wiers, Steffen; Frederichs, Thomas (2014): New constraints on the timing of West Antarctic Ice Sheet retreat in the eastern Amundsen Sea since the Last Glacial Maximum. Global and Planetary Change, 122, 224-237 |
title_fullStr |
Age determination for sediment cores from the Amundsen Sea Embayment, supplement to: Smith, James A; Hillenbrand, Claus-Dieter; Kuhn, Gerhard; Klages, Johann Philipp; Graham, Alastair G C; Larter, Robert D; Ehrmann, Werner; Moreton, Steven Grahame; Wiers, Steffen; Frederichs, Thomas (2014): New constraints on the timing of West Antarctic Ice Sheet retreat in the eastern Amundsen Sea since the Last Glacial Maximum. Global and Planetary Change, 122, 224-237 |
title_full_unstemmed |
Age determination for sediment cores from the Amundsen Sea Embayment, supplement to: Smith, James A; Hillenbrand, Claus-Dieter; Kuhn, Gerhard; Klages, Johann Philipp; Graham, Alastair G C; Larter, Robert D; Ehrmann, Werner; Moreton, Steven Grahame; Wiers, Steffen; Frederichs, Thomas (2014): New constraints on the timing of West Antarctic Ice Sheet retreat in the eastern Amundsen Sea since the Last Glacial Maximum. Global and Planetary Change, 122, 224-237 |
title_sort |
age determination for sediment cores from the amundsen sea embayment, supplement to: smith, james a; hillenbrand, claus-dieter; kuhn, gerhard; klages, johann philipp; graham, alastair g c; larter, robert d; ehrmann, werner; moreton, steven grahame; wiers, steffen; frederichs, thomas (2014): new constraints on the timing of west antarctic ice sheet retreat in the eastern amundsen sea since the last glacial maximum. global and planetary change, 122, 224-237 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2014 |
url |
https://dx.doi.org/10.1594/pangaea.835462 https://doi.pangaea.de/10.1594/PANGAEA.835462 |
long_lat |
ENVELOPE(-46.033,-46.033,-60.616,-60.616) |
geographic |
Antarctic Amundsen Sea West Antarctic Ice Sheet Moreton |
geographic_facet |
Antarctic Amundsen Sea West Antarctic Ice Sheet Moreton |
genre |
Amundsen Sea Antarc* Antarctic Ice Sheet |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Sheet |
op_relation |
https://dx.doi.org/10.1016/j.gloplacha.2014.07.015 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.835462 https://doi.org/10.1016/j.gloplacha.2014.07.015 |
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1766375677111566336 |