Modern sedimentation, circulation and life beneath the Amery Ice Shelf, East Antarctica
The surface sedimentary record from six cores collected from beneath the Amery Ice Shelf, East Antarctica, provides a unique view of the sedimentary and oceanographic processes in this sub-ice shelf setting. The composition and age of the surface sediments indicate spatial variations in ice shelf ca...
Published in: | Continental Shelf Research |
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Language: | English |
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2014
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Online Access: | https://researchers.mq.edu.au/en/publications/da5e2024-a8ab-47d5-a48a-4e5577a14e89 https://doi.org/10.1016/j.csr.2013.10.010 http://www.scopus.com/inward/record.url?scp=84891891461&partnerID=8YFLogxK |
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/da5e2024-a8ab-47d5-a48a-4e5577a14e89 2024-10-13T14:01:14+00:00 Modern sedimentation, circulation and life beneath the Amery Ice Shelf, East Antarctica Post, A. L. Galton-Fenzi, B. K. Riddle, M. J. Herraiz-Borreguero, L. O'Brien, P. E. Hemer, M. A. McMinn, A. Rasch, D. Craven, M. 2014-02-15 https://researchers.mq.edu.au/en/publications/da5e2024-a8ab-47d5-a48a-4e5577a14e89 https://doi.org/10.1016/j.csr.2013.10.010 http://www.scopus.com/inward/record.url?scp=84891891461&partnerID=8YFLogxK eng eng info:eu-repo/semantics/closedAccess Post , A L , Galton-Fenzi , B K , Riddle , M J , Herraiz-Borreguero , L , O'Brien , P E , Hemer , M A , McMinn , A , Rasch , D & Craven , M 2014 , ' Modern sedimentation, circulation and life beneath the Amery Ice Shelf, East Antarctica ' , Continental Shelf Research , vol. 74 , pp. 77-87 . https://doi.org/10.1016/j.csr.2013.10.010 Benthic ecosystem Diatoms Oceanography Sedimentary processes Sub-ice shelf Surface sediments article 2014 ftmacquarieunicr https://doi.org/10.1016/j.csr.2013.10.010 2024-10-03T00:23:11Z The surface sedimentary record from six cores collected from beneath the Amery Ice Shelf, East Antarctica, provides a unique view of the sedimentary and oceanographic processes in this sub-ice shelf setting. The composition and age of the surface sediments indicate spatial variations in ice shelf cavity-ocean interaction, which are consistent with patterns of ocean inflow and outflow modelled and observed beneath the ice shelf. Sediments within 100. km of the ice shelf front (site AM01) show the greatest open ocean influence with a young surface age and the highest total diatom abundance, compared to older ages and lower diatom abundances at sites deeper in the cavity (AM03-AM06). The variable marine influence between sites determines the nature of benthic communities. Seabed imagery indicates the existence of sessile suspension feeders in areas of strong marine inflow (site AM01b), while grazers, deposit feeders and a few suspension feeders occur at sites more distal from the shelf calving front where the food supply is lower (sites AM03 and AM04). Understanding the sedimentary and oceanographic processes within the sub-ice shelf environment allows better constraint of interpretations of down core sediment records, an improved understanding of the nature of biological communities in sub-ice shelf environments, and a baseline for determining the sensitivity of the system to any future changes in ocean dynamics. Article in Journal/Newspaper Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf Macquarie University Research Portal Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) East Antarctica Continental Shelf Research 74 77 87 |
institution |
Open Polar |
collection |
Macquarie University Research Portal |
op_collection_id |
ftmacquarieunicr |
language |
English |
topic |
Benthic ecosystem Diatoms Oceanography Sedimentary processes Sub-ice shelf Surface sediments |
spellingShingle |
Benthic ecosystem Diatoms Oceanography Sedimentary processes Sub-ice shelf Surface sediments Post, A. L. Galton-Fenzi, B. K. Riddle, M. J. Herraiz-Borreguero, L. O'Brien, P. E. Hemer, M. A. McMinn, A. Rasch, D. Craven, M. Modern sedimentation, circulation and life beneath the Amery Ice Shelf, East Antarctica |
topic_facet |
Benthic ecosystem Diatoms Oceanography Sedimentary processes Sub-ice shelf Surface sediments |
description |
The surface sedimentary record from six cores collected from beneath the Amery Ice Shelf, East Antarctica, provides a unique view of the sedimentary and oceanographic processes in this sub-ice shelf setting. The composition and age of the surface sediments indicate spatial variations in ice shelf cavity-ocean interaction, which are consistent with patterns of ocean inflow and outflow modelled and observed beneath the ice shelf. Sediments within 100. km of the ice shelf front (site AM01) show the greatest open ocean influence with a young surface age and the highest total diatom abundance, compared to older ages and lower diatom abundances at sites deeper in the cavity (AM03-AM06). The variable marine influence between sites determines the nature of benthic communities. Seabed imagery indicates the existence of sessile suspension feeders in areas of strong marine inflow (site AM01b), while grazers, deposit feeders and a few suspension feeders occur at sites more distal from the shelf calving front where the food supply is lower (sites AM03 and AM04). Understanding the sedimentary and oceanographic processes within the sub-ice shelf environment allows better constraint of interpretations of down core sediment records, an improved understanding of the nature of biological communities in sub-ice shelf environments, and a baseline for determining the sensitivity of the system to any future changes in ocean dynamics. |
format |
Article in Journal/Newspaper |
author |
Post, A. L. Galton-Fenzi, B. K. Riddle, M. J. Herraiz-Borreguero, L. O'Brien, P. E. Hemer, M. A. McMinn, A. Rasch, D. Craven, M. |
author_facet |
Post, A. L. Galton-Fenzi, B. K. Riddle, M. J. Herraiz-Borreguero, L. O'Brien, P. E. Hemer, M. A. McMinn, A. Rasch, D. Craven, M. |
author_sort |
Post, A. L. |
title |
Modern sedimentation, circulation and life beneath the Amery Ice Shelf, East Antarctica |
title_short |
Modern sedimentation, circulation and life beneath the Amery Ice Shelf, East Antarctica |
title_full |
Modern sedimentation, circulation and life beneath the Amery Ice Shelf, East Antarctica |
title_fullStr |
Modern sedimentation, circulation and life beneath the Amery Ice Shelf, East Antarctica |
title_full_unstemmed |
Modern sedimentation, circulation and life beneath the Amery Ice Shelf, East Antarctica |
title_sort |
modern sedimentation, circulation and life beneath the amery ice shelf, east antarctica |
publishDate |
2014 |
url |
https://researchers.mq.edu.au/en/publications/da5e2024-a8ab-47d5-a48a-4e5577a14e89 https://doi.org/10.1016/j.csr.2013.10.010 http://www.scopus.com/inward/record.url?scp=84891891461&partnerID=8YFLogxK |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) |
geographic |
Amery Amery Ice Shelf East Antarctica |
geographic_facet |
Amery Amery Ice Shelf East Antarctica |
genre |
Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf |
genre_facet |
Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf |
op_source |
Post , A L , Galton-Fenzi , B K , Riddle , M J , Herraiz-Borreguero , L , O'Brien , P E , Hemer , M A , McMinn , A , Rasch , D & Craven , M 2014 , ' Modern sedimentation, circulation and life beneath the Amery Ice Shelf, East Antarctica ' , Continental Shelf Research , vol. 74 , pp. 77-87 . https://doi.org/10.1016/j.csr.2013.10.010 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.csr.2013.10.010 |
container_title |
Continental Shelf Research |
container_volume |
74 |
container_start_page |
77 |
op_container_end_page |
87 |
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1812809166278885376 |