Sedimentological investigations and age constraints of sediment cores from the outer Abbot trough, Amundsen Sea shelf, supplement to: Klages, Johann Philipp; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Smith, James A; Graham, Alastair G C; Nitsche, Frank-Oliver; Frederichs, Thomas; Jernas, Patrycja E; Gohl, Karsten; Wacker, Lukas (2017): Limited grounding-line advance onto the West Antarctic continental shelf in the easternmost Amundsen Sea Embayment during the last glacial period. PLoS ONE, 12(7), e0181593
Precise knowledge about the extent of the West Antarctic Ice Sheet (WAIS) at the Last Glacial Maximum (LGM; c. 26.5-19 cal. ka BP) is important in order to 1) improve paleo-ice sheet reconstructions, 2) provide a robust empirical framework for calibrating paleo-ice sheet models, and 3) locate potent...
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ftdatacite:10.1594/pangaea.857881 2023-05-15T13:23:39+02:00 Sedimentological investigations and age constraints of sediment cores from the outer Abbot trough, Amundsen Sea shelf, supplement to: Klages, Johann Philipp; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Smith, James A; Graham, Alastair G C; Nitsche, Frank-Oliver; Frederichs, Thomas; Jernas, Patrycja E; Gohl, Karsten; Wacker, Lukas (2017): Limited grounding-line advance onto the West Antarctic continental shelf in the easternmost Amundsen Sea Embayment during the last glacial period. PLoS ONE, 12(7), e0181593 Klages, Johann Philipp Kuhn, Gerhard Hillenbrand, Claus-Dieter Smith, James A Graham, Alastair G C Nitsche, Frank-Oliver Frederichs, Thomas Jernas, Patrycja E Gohl, Karsten Wacker, Lukas 2017 application/zip https://dx.doi.org/10.1594/pangaea.857881 https://doi.pangaea.de/10.1594/PANGAEA.857881 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1371/journal.pone.0181593 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo Collection article Supplementary Collection of Datasets 2017 ftdatacite https://doi.org/10.1594/pangaea.857881 https://doi.org/10.1371/journal.pone.0181593 2021-11-05T12:55:41Z Precise knowledge about the extent of the West Antarctic Ice Sheet (WAIS) at the Last Glacial Maximum (LGM; c. 26.5-19 cal. ka BP) is important in order to 1) improve paleo-ice sheet reconstructions, 2) provide a robust empirical framework for calibrating paleo-ice sheet models, and 3) locate potential shelf refugia for Antarctic benthos during the last glacial period. However, reliable reconstructions are still lacking for many WAIS sectors, particularly for key areas on the outer continental shelf, where the LGM-ice sheet is assumed to have terminated. In many areas of the outer continental shelf around Antarctica, direct geological data for the presence or absence of grounded ice during the LGM is lacking because of post-LGM iceberg scouring. This also applies to most of the outer continental shelf in the Amundsen Sea. Here we present detailed marine geophysical and new geological data documenting a sequence of glaciomarine sediments up to ~12 m thick within the deep outer portion of Abbot Trough, a palaeo-ice stream trough on the outer shelf of the Amundsen Sea Embayment. The upper 2-3 meters of this sediment drape contain calcareous foraminifera of Holocene and (pre-)LGM age and, in combination with palaeomagnetic age constraints, indicate that continuous glaciomarine deposition persisted here since well before the LGM, possibly even since the last interglacial period. Our data therefore indicate that the LGM grounding line, whose exact location was previously uncertain, did not reach the shelf edge everywhere in the Amundsen Sea. The LGM grounding line position coincides with the crest of a distinct grounding-zone wedge ~100 km inland from the continental shelf edge. Thus, an area of >6000 km² remained free of grounded ice through the last glacial cycle, requiring the LGM grounding line position to be re-located in this sector, and suggesting a new site at which Antarctic shelf benthos may have survived the last glacial period. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Iceberg* DataCite Metadata Store (German National Library of Science and Technology) Amundsen Sea Antarctic West Antarctic Ice Sheet |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo |
spellingShingle |
Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo Klages, Johann Philipp Kuhn, Gerhard Hillenbrand, Claus-Dieter Smith, James A Graham, Alastair G C Nitsche, Frank-Oliver Frederichs, Thomas Jernas, Patrycja E Gohl, Karsten Wacker, Lukas Sedimentological investigations and age constraints of sediment cores from the outer Abbot trough, Amundsen Sea shelf, supplement to: Klages, Johann Philipp; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Smith, James A; Graham, Alastair G C; Nitsche, Frank-Oliver; Frederichs, Thomas; Jernas, Patrycja E; Gohl, Karsten; Wacker, Lukas (2017): Limited grounding-line advance onto the West Antarctic continental shelf in the easternmost Amundsen Sea Embayment during the last glacial period. PLoS ONE, 12(7), e0181593 |
topic_facet |
Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo |
description |
Precise knowledge about the extent of the West Antarctic Ice Sheet (WAIS) at the Last Glacial Maximum (LGM; c. 26.5-19 cal. ka BP) is important in order to 1) improve paleo-ice sheet reconstructions, 2) provide a robust empirical framework for calibrating paleo-ice sheet models, and 3) locate potential shelf refugia for Antarctic benthos during the last glacial period. However, reliable reconstructions are still lacking for many WAIS sectors, particularly for key areas on the outer continental shelf, where the LGM-ice sheet is assumed to have terminated. In many areas of the outer continental shelf around Antarctica, direct geological data for the presence or absence of grounded ice during the LGM is lacking because of post-LGM iceberg scouring. This also applies to most of the outer continental shelf in the Amundsen Sea. Here we present detailed marine geophysical and new geological data documenting a sequence of glaciomarine sediments up to ~12 m thick within the deep outer portion of Abbot Trough, a palaeo-ice stream trough on the outer shelf of the Amundsen Sea Embayment. The upper 2-3 meters of this sediment drape contain calcareous foraminifera of Holocene and (pre-)LGM age and, in combination with palaeomagnetic age constraints, indicate that continuous glaciomarine deposition persisted here since well before the LGM, possibly even since the last interglacial period. Our data therefore indicate that the LGM grounding line, whose exact location was previously uncertain, did not reach the shelf edge everywhere in the Amundsen Sea. The LGM grounding line position coincides with the crest of a distinct grounding-zone wedge ~100 km inland from the continental shelf edge. Thus, an area of >6000 km² remained free of grounded ice through the last glacial cycle, requiring the LGM grounding line position to be re-located in this sector, and suggesting a new site at which Antarctic shelf benthos may have survived the last glacial period. |
format |
Article in Journal/Newspaper |
author |
Klages, Johann Philipp Kuhn, Gerhard Hillenbrand, Claus-Dieter Smith, James A Graham, Alastair G C Nitsche, Frank-Oliver Frederichs, Thomas Jernas, Patrycja E Gohl, Karsten Wacker, Lukas |
author_facet |
Klages, Johann Philipp Kuhn, Gerhard Hillenbrand, Claus-Dieter Smith, James A Graham, Alastair G C Nitsche, Frank-Oliver Frederichs, Thomas Jernas, Patrycja E Gohl, Karsten Wacker, Lukas |
author_sort |
Klages, Johann Philipp |
title |
Sedimentological investigations and age constraints of sediment cores from the outer Abbot trough, Amundsen Sea shelf, supplement to: Klages, Johann Philipp; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Smith, James A; Graham, Alastair G C; Nitsche, Frank-Oliver; Frederichs, Thomas; Jernas, Patrycja E; Gohl, Karsten; Wacker, Lukas (2017): Limited grounding-line advance onto the West Antarctic continental shelf in the easternmost Amundsen Sea Embayment during the last glacial period. PLoS ONE, 12(7), e0181593 |
title_short |
Sedimentological investigations and age constraints of sediment cores from the outer Abbot trough, Amundsen Sea shelf, supplement to: Klages, Johann Philipp; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Smith, James A; Graham, Alastair G C; Nitsche, Frank-Oliver; Frederichs, Thomas; Jernas, Patrycja E; Gohl, Karsten; Wacker, Lukas (2017): Limited grounding-line advance onto the West Antarctic continental shelf in the easternmost Amundsen Sea Embayment during the last glacial period. PLoS ONE, 12(7), e0181593 |
title_full |
Sedimentological investigations and age constraints of sediment cores from the outer Abbot trough, Amundsen Sea shelf, supplement to: Klages, Johann Philipp; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Smith, James A; Graham, Alastair G C; Nitsche, Frank-Oliver; Frederichs, Thomas; Jernas, Patrycja E; Gohl, Karsten; Wacker, Lukas (2017): Limited grounding-line advance onto the West Antarctic continental shelf in the easternmost Amundsen Sea Embayment during the last glacial period. PLoS ONE, 12(7), e0181593 |
title_fullStr |
Sedimentological investigations and age constraints of sediment cores from the outer Abbot trough, Amundsen Sea shelf, supplement to: Klages, Johann Philipp; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Smith, James A; Graham, Alastair G C; Nitsche, Frank-Oliver; Frederichs, Thomas; Jernas, Patrycja E; Gohl, Karsten; Wacker, Lukas (2017): Limited grounding-line advance onto the West Antarctic continental shelf in the easternmost Amundsen Sea Embayment during the last glacial period. PLoS ONE, 12(7), e0181593 |
title_full_unstemmed |
Sedimentological investigations and age constraints of sediment cores from the outer Abbot trough, Amundsen Sea shelf, supplement to: Klages, Johann Philipp; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Smith, James A; Graham, Alastair G C; Nitsche, Frank-Oliver; Frederichs, Thomas; Jernas, Patrycja E; Gohl, Karsten; Wacker, Lukas (2017): Limited grounding-line advance onto the West Antarctic continental shelf in the easternmost Amundsen Sea Embayment during the last glacial period. PLoS ONE, 12(7), e0181593 |
title_sort |
sedimentological investigations and age constraints of sediment cores from the outer abbot trough, amundsen sea shelf, supplement to: klages, johann philipp; kuhn, gerhard; hillenbrand, claus-dieter; smith, james a; graham, alastair g c; nitsche, frank-oliver; frederichs, thomas; jernas, patrycja e; gohl, karsten; wacker, lukas (2017): limited grounding-line advance onto the west antarctic continental shelf in the easternmost amundsen sea embayment during the last glacial period. plos one, 12(7), e0181593 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2017 |
url |
https://dx.doi.org/10.1594/pangaea.857881 https://doi.pangaea.de/10.1594/PANGAEA.857881 |
geographic |
Amundsen Sea Antarctic West Antarctic Ice Sheet |
geographic_facet |
Amundsen Sea Antarctic West Antarctic Ice Sheet |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Iceberg* |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Iceberg* |
op_relation |
https://dx.doi.org/10.1371/journal.pone.0181593 |
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.857881 https://doi.org/10.1371/journal.pone.0181593 |
_version_ |
1766373858167750656 |