Radiolarian assemblages related to the ocean–ice interaction around the East Antarctic coast
The Southern Ocean plays a central role in Earth's climate, ecology, and biogeochemical cycles. Therefore, understanding long-term changes in Southern Ocean water masses in the geologic past is essential for assessing the role of the Southern Ocean in the climate system. Radiolarian fossils are...
Published in: | Journal of Micropalaeontology |
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ftcopernicus:oai:publications.copernicus.org:jm112020 2024-02-27T08:35:23+00:00 Radiolarian assemblages related to the ocean–ice interaction around the East Antarctic coast Iizuka, Mutsumi Itaki, Takuya Seki, Osamu Makabe, Ryosuke Ojima, Motoha Aoki, Shigeru 2024-01-24 application/pdf https://doi.org/10.5194/jm-43-37-2024 https://jm.copernicus.org/articles/43/37/2024/ eng eng doi:10.5194/jm-43-37-2024 https://jm.copernicus.org/articles/43/37/2024/ eISSN: 2041-4978 Text 2024 ftcopernicus https://doi.org/10.5194/jm-43-37-2024 2024-01-29T17:24:15Z The Southern Ocean plays a central role in Earth's climate, ecology, and biogeochemical cycles. Therefore, understanding long-term changes in Southern Ocean water masses in the geologic past is essential for assessing the role of the Southern Ocean in the climate system. Radiolarian fossils are a useful tool to reconstruct the water masses of the Southern Ocean. However, the radiolarian assemblages in the high latitudes of the Southern Ocean (south of the polar front (PF)) are still poorly understood. In this paper, we report the radiolarian assemblages in surface marine sediment and plankton tow samples collected from the high latitudes south of the PF. In the surface sediments, four factors (named F1–F4) of the radiolarian assemblages were identified using Q-mode factor analysis, which are related to different water masses and hydrological conditions. F1 is related to the surface waters south of the southern boundary (SB) of the Antarctic Circumpolar Current (ACC), which are cooled by melting sea ice and ice sheets. F2 is associated with water masses north of the SB. A comparison with the vertical distribution of the radiolarian assemblages in plankton tow samples indicates that characteristic species are associated with the Circumpolar Deep Water (CDW) and surface waters north of the SB. F3 is associated with modified Circumpolar Deep Water (mCDW). The radiolarian assemblage of F4 does not seem specifically related to any of the water mass here analyzed. However, the species in this assemblage are typically dwells within ice shelf and/or sea ice edge environments. Radiolarian assemblages here identified and associated with water masses, and ice edge environments are useful to reconstruct the environment south of the PF in the geologic past. Text Antarc* Antarctic Ice Shelf Sea ice Southern Ocean Copernicus Publications: E-Journals Antarctic Southern Ocean The Antarctic Journal of Micropalaeontology 43 1 37 53 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The Southern Ocean plays a central role in Earth's climate, ecology, and biogeochemical cycles. Therefore, understanding long-term changes in Southern Ocean water masses in the geologic past is essential for assessing the role of the Southern Ocean in the climate system. Radiolarian fossils are a useful tool to reconstruct the water masses of the Southern Ocean. However, the radiolarian assemblages in the high latitudes of the Southern Ocean (south of the polar front (PF)) are still poorly understood. In this paper, we report the radiolarian assemblages in surface marine sediment and plankton tow samples collected from the high latitudes south of the PF. In the surface sediments, four factors (named F1–F4) of the radiolarian assemblages were identified using Q-mode factor analysis, which are related to different water masses and hydrological conditions. F1 is related to the surface waters south of the southern boundary (SB) of the Antarctic Circumpolar Current (ACC), which are cooled by melting sea ice and ice sheets. F2 is associated with water masses north of the SB. A comparison with the vertical distribution of the radiolarian assemblages in plankton tow samples indicates that characteristic species are associated with the Circumpolar Deep Water (CDW) and surface waters north of the SB. F3 is associated with modified Circumpolar Deep Water (mCDW). The radiolarian assemblage of F4 does not seem specifically related to any of the water mass here analyzed. However, the species in this assemblage are typically dwells within ice shelf and/or sea ice edge environments. Radiolarian assemblages here identified and associated with water masses, and ice edge environments are useful to reconstruct the environment south of the PF in the geologic past. |
format |
Text |
author |
Iizuka, Mutsumi Itaki, Takuya Seki, Osamu Makabe, Ryosuke Ojima, Motoha Aoki, Shigeru |
spellingShingle |
Iizuka, Mutsumi Itaki, Takuya Seki, Osamu Makabe, Ryosuke Ojima, Motoha Aoki, Shigeru Radiolarian assemblages related to the ocean–ice interaction around the East Antarctic coast |
author_facet |
Iizuka, Mutsumi Itaki, Takuya Seki, Osamu Makabe, Ryosuke Ojima, Motoha Aoki, Shigeru |
author_sort |
Iizuka, Mutsumi |
title |
Radiolarian assemblages related to the ocean–ice interaction around the East Antarctic coast |
title_short |
Radiolarian assemblages related to the ocean–ice interaction around the East Antarctic coast |
title_full |
Radiolarian assemblages related to the ocean–ice interaction around the East Antarctic coast |
title_fullStr |
Radiolarian assemblages related to the ocean–ice interaction around the East Antarctic coast |
title_full_unstemmed |
Radiolarian assemblages related to the ocean–ice interaction around the East Antarctic coast |
title_sort |
radiolarian assemblages related to the ocean–ice interaction around the east antarctic coast |
publishDate |
2024 |
url |
https://doi.org/10.5194/jm-43-37-2024 https://jm.copernicus.org/articles/43/37/2024/ |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ice Shelf Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Shelf Sea ice Southern Ocean |
op_source |
eISSN: 2041-4978 |
op_relation |
doi:10.5194/jm-43-37-2024 https://jm.copernicus.org/articles/43/37/2024/ |
op_doi |
https://doi.org/10.5194/jm-43-37-2024 |
container_title |
Journal of Micropalaeontology |
container_volume |
43 |
container_issue |
1 |
container_start_page |
37 |
op_container_end_page |
53 |
_version_ |
1792041937550704640 |