Radiolarian based subsurface temperatures in sediment core MD11-3353 (360kyrs record)
In the Southern Ocean (SO), climate-driven latitudinal migrations of the Antarctic Circumpolar Current (ACC) frontal system impact large-scale ocean circulation and primary productivity. Latitudinal migrations may not have been identical in all SO basins due to the presence or absence of regional ba...
Main Authors: | , , , , , , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2022
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.945936 https://doi.org/10.1594/PANGAEA.945936 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.945936 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.945936 2023-05-15T13:56:34+02:00 Radiolarian based subsurface temperatures in sediment core MD11-3353 (360kyrs record) Civel-Mazens, Matthieu Crosta, Xavier Cortese, Giuseppe Michel, Elisabeth Mazaud, Alain Ther, Olivier Ikehara, Minoru Itaki, Takuya LATITUDE: -50.567000 * LONGITUDE: 68.385000 * DATE/TIME START: 2011-01-30T00:00:00 * DATE/TIME END: 2011-01-30T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.04 m * MAXIMUM DEPTH, sediment/rock: 36.00 m 2022-07-05 text/tab-separated-values, 470 data points https://doi.pangaea.de/10.1594/PANGAEA.945936 https://doi.org/10.1594/PANGAEA.945936 en eng PANGAEA Civel-Mazens, Matthieu; Crosta, Xavier; Cortese, Giuseppe; Michel, Elisabeth; Mazaud, Alain; Ther, Olivier; Ikehara, M; Itaki, Takuya (2021): Antarctic Polar Front migrations in the Kerguelen Plateau region, Southern Ocean, over the past 360 kyrs. Global and Planetary Change, 202, 103526, https://doi.org/10.1016/j.gloplacha.2021.103526 https://doi.pangaea.de/10.1594/PANGAEA.945936 https://doi.org/10.1594/PANGAEA.945936 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY AGE Calculated from radiolarians CALYPSO2 Calypso Corer II DEPTH sediment/rock INDIEN SUD 2 Kerguelen Marion Dufresne (1995) MD11-3353 MD185 Radiolarian Sea sub-surface temperature subsurface temperatures transfer function Dataset 2022 ftpangaea https://doi.org/10.1594/PANGAEA.945936 https://doi.org/10.1016/j.gloplacha.2021.103526 2023-01-20T09:16:10Z In the Southern Ocean (SO), climate-driven latitudinal migrations of the Antarctic Circumpolar Current (ACC) frontal system impact large-scale ocean circulation and primary productivity. Latitudinal migrations may not have been identical in all SO basins due to the presence or absence of regional bathymetric obstacles. The Antarctic Polar Front (APF), defined by the 3–5 ◦C surface temperature range and the 2 ◦C subsurface temperature minimum at 200 m, is particularly important for nutrient redistribution and biodiversity, influencing the soft tissue carbon pump in the modern SO. However, previous assessments of its migrations in the past, mostly based on a single metric or indirect observations, were not always robust. Here, we combine a new proxy for subsurface temperature (sub-ST) reconstructions based on radiolarian assemblages (sub-STrad), with relative abundance variations of key radiolarian species, and sea-surface temperatures (SST) reconstructions, based on diatom assemblages (SSTdiat), to refine estimations of the past mean APF locations in the Kerguelen Plateau (KP) region. Data from three sediment cores on a south (55◦S) to north (47◦S) transect are used to trace the mean APF locations for three climate states, glacials, peak-interglacials and mild-interglacials. Our results suggest that the APF, presently located south of Kerguelen Islands, shifted by 6–7 degrees of latitude and was located north of the KP during all glacial periods of the last 360 kyrs. This suggests that the ACC major flow interacted less with the bottom topography relative to its modern counterpart, probably resulting in less mixing of the water column over and in the lee of the KP. We propose that this process participated in the isolation of Antarctic surface waters (AASW) and in the reduction of macro-nutrient supply, thus resulting in lower regional productivity. During the warmer-than-present early interglacial periods, the APF probably migrated south by ~5 degrees of latitude relative to its modern position, to pass through ... Dataset Antarc* Antarctic Kerguelen Islands Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Kerguelen Kerguelen Islands Southern Ocean The Antarctic ENVELOPE(68.385000,68.385000,-50.567000,-50.567000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AGE Calculated from radiolarians CALYPSO2 Calypso Corer II DEPTH sediment/rock INDIEN SUD 2 Kerguelen Marion Dufresne (1995) MD11-3353 MD185 Radiolarian Sea sub-surface temperature subsurface temperatures transfer function |
spellingShingle |
AGE Calculated from radiolarians CALYPSO2 Calypso Corer II DEPTH sediment/rock INDIEN SUD 2 Kerguelen Marion Dufresne (1995) MD11-3353 MD185 Radiolarian Sea sub-surface temperature subsurface temperatures transfer function Civel-Mazens, Matthieu Crosta, Xavier Cortese, Giuseppe Michel, Elisabeth Mazaud, Alain Ther, Olivier Ikehara, Minoru Itaki, Takuya Radiolarian based subsurface temperatures in sediment core MD11-3353 (360kyrs record) |
topic_facet |
AGE Calculated from radiolarians CALYPSO2 Calypso Corer II DEPTH sediment/rock INDIEN SUD 2 Kerguelen Marion Dufresne (1995) MD11-3353 MD185 Radiolarian Sea sub-surface temperature subsurface temperatures transfer function |
description |
In the Southern Ocean (SO), climate-driven latitudinal migrations of the Antarctic Circumpolar Current (ACC) frontal system impact large-scale ocean circulation and primary productivity. Latitudinal migrations may not have been identical in all SO basins due to the presence or absence of regional bathymetric obstacles. The Antarctic Polar Front (APF), defined by the 3–5 ◦C surface temperature range and the 2 ◦C subsurface temperature minimum at 200 m, is particularly important for nutrient redistribution and biodiversity, influencing the soft tissue carbon pump in the modern SO. However, previous assessments of its migrations in the past, mostly based on a single metric or indirect observations, were not always robust. Here, we combine a new proxy for subsurface temperature (sub-ST) reconstructions based on radiolarian assemblages (sub-STrad), with relative abundance variations of key radiolarian species, and sea-surface temperatures (SST) reconstructions, based on diatom assemblages (SSTdiat), to refine estimations of the past mean APF locations in the Kerguelen Plateau (KP) region. Data from three sediment cores on a south (55◦S) to north (47◦S) transect are used to trace the mean APF locations for three climate states, glacials, peak-interglacials and mild-interglacials. Our results suggest that the APF, presently located south of Kerguelen Islands, shifted by 6–7 degrees of latitude and was located north of the KP during all glacial periods of the last 360 kyrs. This suggests that the ACC major flow interacted less with the bottom topography relative to its modern counterpart, probably resulting in less mixing of the water column over and in the lee of the KP. We propose that this process participated in the isolation of Antarctic surface waters (AASW) and in the reduction of macro-nutrient supply, thus resulting in lower regional productivity. During the warmer-than-present early interglacial periods, the APF probably migrated south by ~5 degrees of latitude relative to its modern position, to pass through ... |
format |
Dataset |
author |
Civel-Mazens, Matthieu Crosta, Xavier Cortese, Giuseppe Michel, Elisabeth Mazaud, Alain Ther, Olivier Ikehara, Minoru Itaki, Takuya |
author_facet |
Civel-Mazens, Matthieu Crosta, Xavier Cortese, Giuseppe Michel, Elisabeth Mazaud, Alain Ther, Olivier Ikehara, Minoru Itaki, Takuya |
author_sort |
Civel-Mazens, Matthieu |
title |
Radiolarian based subsurface temperatures in sediment core MD11-3353 (360kyrs record) |
title_short |
Radiolarian based subsurface temperatures in sediment core MD11-3353 (360kyrs record) |
title_full |
Radiolarian based subsurface temperatures in sediment core MD11-3353 (360kyrs record) |
title_fullStr |
Radiolarian based subsurface temperatures in sediment core MD11-3353 (360kyrs record) |
title_full_unstemmed |
Radiolarian based subsurface temperatures in sediment core MD11-3353 (360kyrs record) |
title_sort |
radiolarian based subsurface temperatures in sediment core md11-3353 (360kyrs record) |
publisher |
PANGAEA |
publishDate |
2022 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.945936 https://doi.org/10.1594/PANGAEA.945936 |
op_coverage |
LATITUDE: -50.567000 * LONGITUDE: 68.385000 * DATE/TIME START: 2011-01-30T00:00:00 * DATE/TIME END: 2011-01-30T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.04 m * MAXIMUM DEPTH, sediment/rock: 36.00 m |
long_lat |
ENVELOPE(68.385000,68.385000,-50.567000,-50.567000) |
geographic |
Antarctic Kerguelen Kerguelen Islands Southern Ocean The Antarctic |
geographic_facet |
Antarctic Kerguelen Kerguelen Islands Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Kerguelen Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Kerguelen Islands Southern Ocean |
op_relation |
Civel-Mazens, Matthieu; Crosta, Xavier; Cortese, Giuseppe; Michel, Elisabeth; Mazaud, Alain; Ther, Olivier; Ikehara, M; Itaki, Takuya (2021): Antarctic Polar Front migrations in the Kerguelen Plateau region, Southern Ocean, over the past 360 kyrs. Global and Planetary Change, 202, 103526, https://doi.org/10.1016/j.gloplacha.2021.103526 https://doi.pangaea.de/10.1594/PANGAEA.945936 https://doi.org/10.1594/PANGAEA.945936 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.945936 https://doi.org/10.1016/j.gloplacha.2021.103526 |
_version_ |
1766264092514844672 |