Late Quaternary dynamics of the Lambert Glacier-Amery Ice Shelf system, East Antarctica
The Lambert Glacier-Amery Ice Shelf system (LGAISS) is the largest outlet glacier system in East Antarctica but its response to past climate variability is poorly constrained. In this study, we explore its dynamics over the last ∼520 thousand years using new high-resolution sedimentary records retri...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:10118240 2023-12-24T10:08:01+01:00 Late Quaternary dynamics of the Lambert Glacier-Amery Ice Shelf system, East Antarctica Wu, L Wilson, DJ Wang, R Passchier, S Krijgsman, W Yu, X Wen, T Xiao, W Liu, Z 2020-01-15 text https://discovery.ucl.ac.uk/id/eprint/10118240/1/Wu%20et%20al%202021%20QSR%20LGAISS%20accepted%20ms%20%2B%20supp.pdf https://discovery.ucl.ac.uk/id/eprint/10118240/ eng eng https://discovery.ucl.ac.uk/id/eprint/10118240/1/Wu%20et%20al%202021%20QSR%20LGAISS%20accepted%20ms%20%2B%20supp.pdf https://discovery.ucl.ac.uk/id/eprint/10118240/ open Quaternary Science Reviews , 252 , Article 106738. (2020) Quaternary Glaciology Antarctica Prydz Bay Lambert Glacier-Amery Ice Shelf System Ice sheet dynamics Clay minerals Iceberg rafted debris Article 2020 ftucl 2023-11-27T13:07:32Z The Lambert Glacier-Amery Ice Shelf system (LGAISS) is the largest outlet glacier system in East Antarctica but its response to past climate variability is poorly constrained. In this study, we explore its dynamics over the last ∼520 thousand years using new high-resolution sedimentary records retrieved off Prydz Bay. Episodic occurrences of iceberg rafted debris indicate a dynamic ice sheet throughout this interval, while changes in clay mineral compositions provide detailed evidence on the waxing and waning of the LGAISS. Our data indicate that advance and retreat of the LGAISS was sensitive to oceanic forcing, but also responded to local summer insolation when insolation peaks combined with interglacial sea level high stands. Subglacial bed topography may have played an additional role in modulating the LGAISS behaviour, which could explain sectoral differences in the response of the East Antarctic Ice Sheet to climate change. Overall, our records indicate that the LGAISS advanced more extensively during previous late Quaternary glacial periods than during Marine Isotope Stages 2 and 4. Furthermore, the LGAISS retreated more significantly than present during Marine Isotope Stage 13, and only moderately during Marine Isotope Stage 7, which suggests that the duration of warm climatic states could be a key factor affecting the dynamics of the East Antarctic Ice Sheet. Article in Journal/Newspaper Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Iceberg* Lambert Glacier Prydz Bay University College London: UCL Discovery Antarctic East Antarctica Prydz Bay East Antarctic Ice Sheet Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Lambert Glacier ENVELOPE(67.490,67.490,-73.065,-73.065) |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
English |
topic |
Quaternary Glaciology Antarctica Prydz Bay Lambert Glacier-Amery Ice Shelf System Ice sheet dynamics Clay minerals Iceberg rafted debris |
spellingShingle |
Quaternary Glaciology Antarctica Prydz Bay Lambert Glacier-Amery Ice Shelf System Ice sheet dynamics Clay minerals Iceberg rafted debris Wu, L Wilson, DJ Wang, R Passchier, S Krijgsman, W Yu, X Wen, T Xiao, W Liu, Z Late Quaternary dynamics of the Lambert Glacier-Amery Ice Shelf system, East Antarctica |
topic_facet |
Quaternary Glaciology Antarctica Prydz Bay Lambert Glacier-Amery Ice Shelf System Ice sheet dynamics Clay minerals Iceberg rafted debris |
description |
The Lambert Glacier-Amery Ice Shelf system (LGAISS) is the largest outlet glacier system in East Antarctica but its response to past climate variability is poorly constrained. In this study, we explore its dynamics over the last ∼520 thousand years using new high-resolution sedimentary records retrieved off Prydz Bay. Episodic occurrences of iceberg rafted debris indicate a dynamic ice sheet throughout this interval, while changes in clay mineral compositions provide detailed evidence on the waxing and waning of the LGAISS. Our data indicate that advance and retreat of the LGAISS was sensitive to oceanic forcing, but also responded to local summer insolation when insolation peaks combined with interglacial sea level high stands. Subglacial bed topography may have played an additional role in modulating the LGAISS behaviour, which could explain sectoral differences in the response of the East Antarctic Ice Sheet to climate change. Overall, our records indicate that the LGAISS advanced more extensively during previous late Quaternary glacial periods than during Marine Isotope Stages 2 and 4. Furthermore, the LGAISS retreated more significantly than present during Marine Isotope Stage 13, and only moderately during Marine Isotope Stage 7, which suggests that the duration of warm climatic states could be a key factor affecting the dynamics of the East Antarctic Ice Sheet. |
format |
Article in Journal/Newspaper |
author |
Wu, L Wilson, DJ Wang, R Passchier, S Krijgsman, W Yu, X Wen, T Xiao, W Liu, Z |
author_facet |
Wu, L Wilson, DJ Wang, R Passchier, S Krijgsman, W Yu, X Wen, T Xiao, W Liu, Z |
author_sort |
Wu, L |
title |
Late Quaternary dynamics of the Lambert Glacier-Amery Ice Shelf system, East Antarctica |
title_short |
Late Quaternary dynamics of the Lambert Glacier-Amery Ice Shelf system, East Antarctica |
title_full |
Late Quaternary dynamics of the Lambert Glacier-Amery Ice Shelf system, East Antarctica |
title_fullStr |
Late Quaternary dynamics of the Lambert Glacier-Amery Ice Shelf system, East Antarctica |
title_full_unstemmed |
Late Quaternary dynamics of the Lambert Glacier-Amery Ice Shelf system, East Antarctica |
title_sort |
late quaternary dynamics of the lambert glacier-amery ice shelf system, east antarctica |
publishDate |
2020 |
url |
https://discovery.ucl.ac.uk/id/eprint/10118240/1/Wu%20et%20al%202021%20QSR%20LGAISS%20accepted%20ms%20%2B%20supp.pdf https://discovery.ucl.ac.uk/id/eprint/10118240/ |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) ENVELOPE(67.490,67.490,-73.065,-73.065) |
geographic |
Antarctic East Antarctica Prydz Bay East Antarctic Ice Sheet Amery Amery Ice Shelf Lambert Glacier |
geographic_facet |
Antarctic East Antarctica Prydz Bay East Antarctic Ice Sheet Amery Amery Ice Shelf Lambert Glacier |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Iceberg* Lambert Glacier Prydz Bay |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Iceberg* Lambert Glacier Prydz Bay |
op_source |
Quaternary Science Reviews , 252 , Article 106738. (2020) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/10118240/1/Wu%20et%20al%202021%20QSR%20LGAISS%20accepted%20ms%20%2B%20supp.pdf https://discovery.ucl.ac.uk/id/eprint/10118240/ |
op_rights |
open |
_version_ |
1786171419448573952 |