Diatom based sea surface temperatures in core MD11-3353 (150kyrs 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...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.945937 2024-09-15T17:48:05+00:00 Diatom based sea surface temperatures in core MD11-3353 (150kyrs record) Crosta, Xavier Civel-Mazens, Matthieu 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: 0.0 m * MAXIMUM DEPTH, sediment/rock: 13.0 m 2022 text/tab-separated-values, 131 data points https://doi.pangaea.de/10.1594/PANGAEA.945937 https://doi.org/10.1594/PANGAEA.945937 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.945937 https://doi.org/10.1594/PANGAEA.945937 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess AGE CALYPSO2 Calypso Corer II DEPTH sediment/rock Diatom INDIEN SUD 2 Kerguelen Marion Dufresne (1995) MD11-3353 MD185 Sea surface temperature SST calculated from diatoms transfer function dataset 2022 ftpangaea https://doi.org/10.1594/PANGAEA.94593710.1016/j.gloplacha.2021.103526 2024-07-24T02:31:34Z 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 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 CALYPSO2 Calypso Corer II DEPTH sediment/rock Diatom INDIEN SUD 2 Kerguelen Marion Dufresne (1995) MD11-3353 MD185 Sea surface temperature SST calculated from diatoms transfer function |
spellingShingle |
AGE CALYPSO2 Calypso Corer II DEPTH sediment/rock Diatom INDIEN SUD 2 Kerguelen Marion Dufresne (1995) MD11-3353 MD185 Sea surface temperature SST calculated from diatoms transfer function Crosta, Xavier Civel-Mazens, Matthieu Cortese, Giuseppe Michel, Elisabeth Mazaud, Alain Ther, Olivier Ikehara, Minoru Itaki, Takuya Diatom based sea surface temperatures in core MD11-3353 (150kyrs record) |
topic_facet |
AGE CALYPSO2 Calypso Corer II DEPTH sediment/rock Diatom INDIEN SUD 2 Kerguelen Marion Dufresne (1995) MD11-3353 MD185 Sea surface temperature SST calculated from diatoms 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 |
Crosta, Xavier Civel-Mazens, Matthieu Cortese, Giuseppe Michel, Elisabeth Mazaud, Alain Ther, Olivier Ikehara, Minoru Itaki, Takuya |
author_facet |
Crosta, Xavier Civel-Mazens, Matthieu Cortese, Giuseppe Michel, Elisabeth Mazaud, Alain Ther, Olivier Ikehara, Minoru Itaki, Takuya |
author_sort |
Crosta, Xavier |
title |
Diatom based sea surface temperatures in core MD11-3353 (150kyrs record) |
title_short |
Diatom based sea surface temperatures in core MD11-3353 (150kyrs record) |
title_full |
Diatom based sea surface temperatures in core MD11-3353 (150kyrs record) |
title_fullStr |
Diatom based sea surface temperatures in core MD11-3353 (150kyrs record) |
title_full_unstemmed |
Diatom based sea surface temperatures in core MD11-3353 (150kyrs record) |
title_sort |
diatom based sea surface temperatures in core md11-3353 (150kyrs record) |
publisher |
PANGAEA |
publishDate |
2022 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.945937 https://doi.org/10.1594/PANGAEA.945937 |
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: 0.0 m * MAXIMUM DEPTH, sediment/rock: 13.0 m |
long_lat |
ENVELOPE(68.385000,68.385000,-50.567000,-50.567000) |
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.945937 https://doi.org/10.1594/PANGAEA.945937 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.94593710.1016/j.gloplacha.2021.103526 |
_version_ |
1810289017041715200 |