Controls since the mid‐Pleistocene transition on sedimentation and primary productivity downslope of Totten Glacier, East Antarctica
The rapidly thinning Totten Glacier on the Sabrina Coast, East Antarctica, is the primary drainage outlet for ice within the Aurora Subglacial Basin, which could destabilize under the current atmospheric warming trend. There is growing need for direct geological evidence from the Sabrina Coast to fr...
Published in: | Paleoceanography and Paleoclimatology |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://researchers.mq.edu.au/en/publications/ed6b28cc-cf3d-4069-8454-271a5a5055d5 https://doi.org/10.1029/2020PA003981 http://www.scopus.com/inward/record.url?scp=85098231031&partnerID=8YFLogxK http://purl.org/au-research/grants/arc/DP170100557 |
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/ed6b28cc-cf3d-4069-8454-271a5a5055d5 2024-10-13T14:01:19+00:00 Controls since the mid‐Pleistocene transition on sedimentation and primary productivity downslope of Totten Glacier, East Antarctica Holder, L. Duffy, M. Opdyke, B. Leventer, A. Post, A. O'Brien, P. Armand, L. K. 2020-12 https://researchers.mq.edu.au/en/publications/ed6b28cc-cf3d-4069-8454-271a5a5055d5 https://doi.org/10.1029/2020PA003981 http://www.scopus.com/inward/record.url?scp=85098231031&partnerID=8YFLogxK http://purl.org/au-research/grants/arc/DP170100557 eng eng info:eu-repo/semantics/closedAccess Holder , L , Duffy , M , Opdyke , B , Leventer , A , Post , A , O'Brien , P & Armand , L K 2020 , ' Controls since the mid‐Pleistocene transition on sedimentation and primary productivity downslope of Totten Glacier, East Antarctica ' , Paleoceanography and Paleoclimatology , vol. 35 , no. 12 , e2020PA003981 , pp. 1-25 . https://doi.org/10.1029/2020PA003981 article 2020 ftmacquarieunicr https://doi.org/10.1029/2020PA003981 2024-09-26T15:15:56Z The rapidly thinning Totten Glacier on the Sabrina Coast, East Antarctica, is the primary drainage outlet for ice within the Aurora Subglacial Basin, which could destabilize under the current atmospheric warming trend. There is growing need for direct geological evidence from the Sabrina Coast to frame late twentieth century Totten melting in the context of past warm climate analogs. Addressing this need, sediment archives were recovered from two sites on the Sabrina Coast slope and rise that record changes in terrigenous sedimentation and primary productivity in the region over glacial cycles since the mid-Pleistocene transition (MPT). This research presents physical properties, grain size, diatom abundance and assemblages, and geochemical analysis from the two sites to determine how the processes that control sedimentation change between glacial and interglacial phases. The stratigraphic sequences in both cores record cyclic variations in physical properties and diatom abundances, which radiocarbon and biostratigraphic chronologies reveal as 100 Kyr glacial-interglacial cyclicity. During glacials, terrigenous sediment deposition is enhanced by advanced grounded ice on the shelf, while primary productivity is restricted due to permanent summer sea ice extending past the continental slope. During interglacials, pelagic sedimentation suggests high surface productivity associated with contractions of regional sea ice cover. Comparison with post-MPT slope records from Wilkes Land and the Amundsen Sea shows that this pattern is consistent in slope sediments around the margin. The higher-amplitude variations in Antarctic ice volume and sea ice extent post-MPT ensure that these signals are pervasive around the Antarctic margin. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica East Antarctica Sea ice Totten Glacier Wilkes Land Macquarie University Research Portal Amundsen Sea Antarctic East Antarctica Sabrina Coast ENVELOPE(118.550,118.550,-67.000,-67.000) The Antarctic Totten Glacier ENVELOPE(116.333,116.333,-66.833,-66.833) Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Paleoceanography and Paleoclimatology 35 12 |
institution |
Open Polar |
collection |
Macquarie University Research Portal |
op_collection_id |
ftmacquarieunicr |
language |
English |
description |
The rapidly thinning Totten Glacier on the Sabrina Coast, East Antarctica, is the primary drainage outlet for ice within the Aurora Subglacial Basin, which could destabilize under the current atmospheric warming trend. There is growing need for direct geological evidence from the Sabrina Coast to frame late twentieth century Totten melting in the context of past warm climate analogs. Addressing this need, sediment archives were recovered from two sites on the Sabrina Coast slope and rise that record changes in terrigenous sedimentation and primary productivity in the region over glacial cycles since the mid-Pleistocene transition (MPT). This research presents physical properties, grain size, diatom abundance and assemblages, and geochemical analysis from the two sites to determine how the processes that control sedimentation change between glacial and interglacial phases. The stratigraphic sequences in both cores record cyclic variations in physical properties and diatom abundances, which radiocarbon and biostratigraphic chronologies reveal as 100 Kyr glacial-interglacial cyclicity. During glacials, terrigenous sediment deposition is enhanced by advanced grounded ice on the shelf, while primary productivity is restricted due to permanent summer sea ice extending past the continental slope. During interglacials, pelagic sedimentation suggests high surface productivity associated with contractions of regional sea ice cover. Comparison with post-MPT slope records from Wilkes Land and the Amundsen Sea shows that this pattern is consistent in slope sediments around the margin. The higher-amplitude variations in Antarctic ice volume and sea ice extent post-MPT ensure that these signals are pervasive around the Antarctic margin. |
format |
Article in Journal/Newspaper |
author |
Holder, L. Duffy, M. Opdyke, B. Leventer, A. Post, A. O'Brien, P. Armand, L. K. |
spellingShingle |
Holder, L. Duffy, M. Opdyke, B. Leventer, A. Post, A. O'Brien, P. Armand, L. K. Controls since the mid‐Pleistocene transition on sedimentation and primary productivity downslope of Totten Glacier, East Antarctica |
author_facet |
Holder, L. Duffy, M. Opdyke, B. Leventer, A. Post, A. O'Brien, P. Armand, L. K. |
author_sort |
Holder, L. |
title |
Controls since the mid‐Pleistocene transition on sedimentation and primary productivity downslope of Totten Glacier, East Antarctica |
title_short |
Controls since the mid‐Pleistocene transition on sedimentation and primary productivity downslope of Totten Glacier, East Antarctica |
title_full |
Controls since the mid‐Pleistocene transition on sedimentation and primary productivity downslope of Totten Glacier, East Antarctica |
title_fullStr |
Controls since the mid‐Pleistocene transition on sedimentation and primary productivity downslope of Totten Glacier, East Antarctica |
title_full_unstemmed |
Controls since the mid‐Pleistocene transition on sedimentation and primary productivity downslope of Totten Glacier, East Antarctica |
title_sort |
controls since the mid‐pleistocene transition on sedimentation and primary productivity downslope of totten glacier, east antarctica |
publishDate |
2020 |
url |
https://researchers.mq.edu.au/en/publications/ed6b28cc-cf3d-4069-8454-271a5a5055d5 https://doi.org/10.1029/2020PA003981 http://www.scopus.com/inward/record.url?scp=85098231031&partnerID=8YFLogxK http://purl.org/au-research/grants/arc/DP170100557 |
long_lat |
ENVELOPE(118.550,118.550,-67.000,-67.000) ENVELOPE(116.333,116.333,-66.833,-66.833) ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Amundsen Sea Antarctic East Antarctica Sabrina Coast The Antarctic Totten Glacier Wilkes Land |
geographic_facet |
Amundsen Sea Antarctic East Antarctica Sabrina Coast The Antarctic Totten Glacier Wilkes Land |
genre |
Amundsen Sea Antarc* Antarctic Antarctica East Antarctica Sea ice Totten Glacier Wilkes Land |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica East Antarctica Sea ice Totten Glacier Wilkes Land |
op_source |
Holder , L , Duffy , M , Opdyke , B , Leventer , A , Post , A , O'Brien , P & Armand , L K 2020 , ' Controls since the mid‐Pleistocene transition on sedimentation and primary productivity downslope of Totten Glacier, East Antarctica ' , Paleoceanography and Paleoclimatology , vol. 35 , no. 12 , e2020PA003981 , pp. 1-25 . https://doi.org/10.1029/2020PA003981 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1029/2020PA003981 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
35 |
container_issue |
12 |
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1812809549437992960 |