Hunting paleoceanographic archives of ice sheet-ocean interaction in the northwestern Ross Sea, Antarctica
The analysis of sedimentary deposits influenced by bottom currents in glaciated continental margins provides crucial insights into paleo-depositional and oceanographic conditions. These reconstructions enable the assessment of interactions between advance and retreat of grounded ice sheets and past...
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Online Access: | http://dx.doi.org/10.3389/feart.2023.1234347 https://www.frontiersin.org/articles/10.3389/feart.2023.1234347/full |
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crfrontiers:10.3389/feart.2023.1234347 2024-02-11T09:57:11+01:00 Hunting paleoceanographic archives of ice sheet-ocean interaction in the northwestern Ross Sea, Antarctica Kim, Sookwan De Santis, Laura Hong, Jong Kuk Colizza, Ester Kim, Sunghan Bergamasco, Andrea Lee, Sang-Hoon Kang, Seung-Goo Lee, Min Kyung Kim, Hyoungjun Choi, Yeonjin Geniram, Andrea Choi, Hyoung Gyu Lee, Jae Il Yoo, Kyu-Cheul Park, Yongcheol 2023 http://dx.doi.org/10.3389/feart.2023.1234347 https://www.frontiersin.org/articles/10.3389/feart.2023.1234347/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Earth Science volume 11 ISSN 2296-6463 General Earth and Planetary Sciences journal-article 2023 crfrontiers https://doi.org/10.3389/feart.2023.1234347 2024-01-26T10:02:14Z The analysis of sedimentary deposits influenced by bottom currents in glaciated continental margins provides crucial insights into paleo-depositional and oceanographic conditions. These reconstructions enable the assessment of interactions between advance and retreat of grounded ice sheets and past ocean circulation patterns. However, questions regarding these interactions and their specific mechanisms remain largely unanswered due to a lack of data in this remote area. In this study, we conducted a comprehensive analysis by integrating marine geophysical data, surficial sediment cores, oceanographic measurements, and ocean circulation models. Our aim was to understand spatial and temporal variations in sedimentary and oceanographic conditions during the past glacial and interglacial periods in combination with the long-term stratigraphic evolution. By integrating and cross-referencing diverse datasets, we were able to infer how bottom-current-controlled deposits (i.e., contourites) developed along the western bathymetric high of the Central Basin in the northwestern Ross Sea margin, Antarctica. Contouritic deposits lying over and along the flanks of bathymetric highs were identified through their mound-shaped external geometry and acoustically stratified facies, characterized by reflectors pinching toward the moat. Acoustic facies and multi-beam backscatter results, in conjunction with sedimentary core data, revealed contrasting patterns. Bathymetric highs exhibited thin (<10 m thick) coarser-grained sedimentary layers with higher backscatter, while the lower slope and rise displayed thick (>10 m thick), finer-grained stratified sediments with lower backscatter. These findings indicate that seabed winnowing occurred by strong bottom current during past glacial periods as supported by sedimentological analysis. The pathways of the westward-deflected dense shelf water outflow and the westward-flowing along-slope current, as simulated by oceanographic models, explain the distinctive development of ... Article in Journal/Newspaper Antarc* Antarctica Ice Sheet Ross Sea Frontiers (Publisher) Central Basin ENVELOPE(178.000,178.000,-72.300,-72.300) Ross Sea Frontiers in Earth Science 11 |
institution |
Open Polar |
collection |
Frontiers (Publisher) |
op_collection_id |
crfrontiers |
language |
unknown |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Kim, Sookwan De Santis, Laura Hong, Jong Kuk Colizza, Ester Kim, Sunghan Bergamasco, Andrea Lee, Sang-Hoon Kang, Seung-Goo Lee, Min Kyung Kim, Hyoungjun Choi, Yeonjin Geniram, Andrea Choi, Hyoung Gyu Lee, Jae Il Yoo, Kyu-Cheul Park, Yongcheol Hunting paleoceanographic archives of ice sheet-ocean interaction in the northwestern Ross Sea, Antarctica |
topic_facet |
General Earth and Planetary Sciences |
description |
The analysis of sedimentary deposits influenced by bottom currents in glaciated continental margins provides crucial insights into paleo-depositional and oceanographic conditions. These reconstructions enable the assessment of interactions between advance and retreat of grounded ice sheets and past ocean circulation patterns. However, questions regarding these interactions and their specific mechanisms remain largely unanswered due to a lack of data in this remote area. In this study, we conducted a comprehensive analysis by integrating marine geophysical data, surficial sediment cores, oceanographic measurements, and ocean circulation models. Our aim was to understand spatial and temporal variations in sedimentary and oceanographic conditions during the past glacial and interglacial periods in combination with the long-term stratigraphic evolution. By integrating and cross-referencing diverse datasets, we were able to infer how bottom-current-controlled deposits (i.e., contourites) developed along the western bathymetric high of the Central Basin in the northwestern Ross Sea margin, Antarctica. Contouritic deposits lying over and along the flanks of bathymetric highs were identified through their mound-shaped external geometry and acoustically stratified facies, characterized by reflectors pinching toward the moat. Acoustic facies and multi-beam backscatter results, in conjunction with sedimentary core data, revealed contrasting patterns. Bathymetric highs exhibited thin (<10 m thick) coarser-grained sedimentary layers with higher backscatter, while the lower slope and rise displayed thick (>10 m thick), finer-grained stratified sediments with lower backscatter. These findings indicate that seabed winnowing occurred by strong bottom current during past glacial periods as supported by sedimentological analysis. The pathways of the westward-deflected dense shelf water outflow and the westward-flowing along-slope current, as simulated by oceanographic models, explain the distinctive development of ... |
format |
Article in Journal/Newspaper |
author |
Kim, Sookwan De Santis, Laura Hong, Jong Kuk Colizza, Ester Kim, Sunghan Bergamasco, Andrea Lee, Sang-Hoon Kang, Seung-Goo Lee, Min Kyung Kim, Hyoungjun Choi, Yeonjin Geniram, Andrea Choi, Hyoung Gyu Lee, Jae Il Yoo, Kyu-Cheul Park, Yongcheol |
author_facet |
Kim, Sookwan De Santis, Laura Hong, Jong Kuk Colizza, Ester Kim, Sunghan Bergamasco, Andrea Lee, Sang-Hoon Kang, Seung-Goo Lee, Min Kyung Kim, Hyoungjun Choi, Yeonjin Geniram, Andrea Choi, Hyoung Gyu Lee, Jae Il Yoo, Kyu-Cheul Park, Yongcheol |
author_sort |
Kim, Sookwan |
title |
Hunting paleoceanographic archives of ice sheet-ocean interaction in the northwestern Ross Sea, Antarctica |
title_short |
Hunting paleoceanographic archives of ice sheet-ocean interaction in the northwestern Ross Sea, Antarctica |
title_full |
Hunting paleoceanographic archives of ice sheet-ocean interaction in the northwestern Ross Sea, Antarctica |
title_fullStr |
Hunting paleoceanographic archives of ice sheet-ocean interaction in the northwestern Ross Sea, Antarctica |
title_full_unstemmed |
Hunting paleoceanographic archives of ice sheet-ocean interaction in the northwestern Ross Sea, Antarctica |
title_sort |
hunting paleoceanographic archives of ice sheet-ocean interaction in the northwestern ross sea, antarctica |
publisher |
Frontiers Media SA |
publishDate |
2023 |
url |
http://dx.doi.org/10.3389/feart.2023.1234347 https://www.frontiersin.org/articles/10.3389/feart.2023.1234347/full |
long_lat |
ENVELOPE(178.000,178.000,-72.300,-72.300) |
geographic |
Central Basin Ross Sea |
geographic_facet |
Central Basin Ross Sea |
genre |
Antarc* Antarctica Ice Sheet Ross Sea |
genre_facet |
Antarc* Antarctica Ice Sheet Ross Sea |
op_source |
Frontiers in Earth Science volume 11 ISSN 2296-6463 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/feart.2023.1234347 |
container_title |
Frontiers in Earth Science |
container_volume |
11 |
_version_ |
1790609352317468672 |