Mg/Ca and isotopic data of sediment core PS75/059-2
Southern Ocean Intermediate Waters (SOIWs), such as Antarctic Intermediate Water and Subantarctic Mode Water, play a key role in modulating the global climate on glacial-interglacial time scales. They link the Southern Ocean and the tropics via mechanisms such as "oceanic tunneling" that t...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.899276 2023-05-15T14:04:57+02:00 Mg/Ca and isotopic data of sediment core PS75/059-2 Tapia, Raúl Nürnberg, Dirk Ho, Sze Ling Lamy, Frank Ullermann, Johannes Gersonde, Rainer Tiedemann, Ralf LATITUDE: -54.215000 * LONGITUDE: -125.425500 * DATE/TIME START: 2009-12-18T02:30:00 * DATE/TIME END: 2009-12-18T02:30:00 * MINIMUM ELEVATION: -3613.0 m * MAXIMUM ELEVATION: -3613.0 m 2019-03-14 text/tab-separated-values, 862 data points https://doi.pangaea.de/10.1594/PANGAEA.899276 https://doi.org/10.1594/PANGAEA.899276 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.899276 https://doi.org/10.1594/PANGAEA.899276 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Tapia, Raúl; Nürnberg, Dirk; Ho, Sze Ling; Lamy, Frank; Ullermann, Johannes; Gersonde, Rainer; Tiedemann, Ralf (2019): Glacial differences of Southern Ocean Intermediate Waters in the Central South Pacific. Quaternary Science Reviews, 208, 105-117, https://doi.org/10.1016/j.quascirev.2019.01.016 AGE ANT-XXVI/2 Globigerina bulloides δ13C δ18O Globorotalia inflata Intermediate water masses KL Last Glacial Maximum Mg/Ca Penultimate Glacial Maximum Piston corer (BGR type) planktic foraminifera Polarstern PS75/059-2 PS75 BIPOMAC Sea surface temperature Southern Ocean South Pacific Ocean Stable isotopes Subsurface temperature Dataset 2019 ftpangaea https://doi.org/10.1594/PANGAEA.899276 https://doi.org/10.1016/j.quascirev.2019.01.016 2023-01-20T09:12:09Z Southern Ocean Intermediate Waters (SOIWs), such as Antarctic Intermediate Water and Subantarctic Mode Water, play a key role in modulating the global climate on glacial-interglacial time scales. They link the Southern Ocean and the tropics via mechanisms such as "oceanic tunneling" that transport climatic signals across latitudes. Despite their importance, the past evolution of the SOIWs in the Central South Pacific is largely unknown. Here we compare paired Mg/Ca-temperature, stable carbon (δ13C) and oxygen (δ18O) isotope records from surface-dwelling and deep-dwelling planktic foraminifera to infer changes in the water column structure for the last 260 ka in the Central South Pacific (54° S). Our study focuses on the subsurface oceanographic variability controlled by SOIWs, which are subducted at the Subantarctic Front. Our data show that the subsurface ocean in the Central South Pacific was colder and fresher during glacial stages than during the Holocene (0-10 ka BP), suggesting a general glacial enhanced presence of Antarctic Intermediate Water, in agreement with previous studies from the Eastern Equatorial Pacific and the Southeast Pacific. However, the subsurface ocean salinity differs for both glacial stages, with fresher condition during the Last Glacial Maximum (LGM; ∼26.5-19 ka BP) and more saline condition during the Penultimate Glacial Maximum (PGM; ∼155-140 ka BP). The δ13C data also show contrasting conditions for both glacial time windows in the upper water column, with a large depletion of 0.37‰ in δ13C from the LGM values, suggests a larger contribution of "old" low δ13C deep waters at intermediate depths at the study site during the PGM, plausibly due to stronger upwelling in high southern latitudes. The dissimilar scenarios between the LGM and the PGM may have been caused by processes that are analogous to the phase-switch in modern day Southern Annular Mode. Dataset Antarc* Antarctic Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Southern Ocean Pacific ENVELOPE(-125.425500,-125.425500,-54.215000,-54.215000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AGE ANT-XXVI/2 Globigerina bulloides δ13C δ18O Globorotalia inflata Intermediate water masses KL Last Glacial Maximum Mg/Ca Penultimate Glacial Maximum Piston corer (BGR type) planktic foraminifera Polarstern PS75/059-2 PS75 BIPOMAC Sea surface temperature Southern Ocean South Pacific Ocean Stable isotopes Subsurface temperature |
spellingShingle |
AGE ANT-XXVI/2 Globigerina bulloides δ13C δ18O Globorotalia inflata Intermediate water masses KL Last Glacial Maximum Mg/Ca Penultimate Glacial Maximum Piston corer (BGR type) planktic foraminifera Polarstern PS75/059-2 PS75 BIPOMAC Sea surface temperature Southern Ocean South Pacific Ocean Stable isotopes Subsurface temperature Tapia, Raúl Nürnberg, Dirk Ho, Sze Ling Lamy, Frank Ullermann, Johannes Gersonde, Rainer Tiedemann, Ralf Mg/Ca and isotopic data of sediment core PS75/059-2 |
topic_facet |
AGE ANT-XXVI/2 Globigerina bulloides δ13C δ18O Globorotalia inflata Intermediate water masses KL Last Glacial Maximum Mg/Ca Penultimate Glacial Maximum Piston corer (BGR type) planktic foraminifera Polarstern PS75/059-2 PS75 BIPOMAC Sea surface temperature Southern Ocean South Pacific Ocean Stable isotopes Subsurface temperature |
description |
Southern Ocean Intermediate Waters (SOIWs), such as Antarctic Intermediate Water and Subantarctic Mode Water, play a key role in modulating the global climate on glacial-interglacial time scales. They link the Southern Ocean and the tropics via mechanisms such as "oceanic tunneling" that transport climatic signals across latitudes. Despite their importance, the past evolution of the SOIWs in the Central South Pacific is largely unknown. Here we compare paired Mg/Ca-temperature, stable carbon (δ13C) and oxygen (δ18O) isotope records from surface-dwelling and deep-dwelling planktic foraminifera to infer changes in the water column structure for the last 260 ka in the Central South Pacific (54° S). Our study focuses on the subsurface oceanographic variability controlled by SOIWs, which are subducted at the Subantarctic Front. Our data show that the subsurface ocean in the Central South Pacific was colder and fresher during glacial stages than during the Holocene (0-10 ka BP), suggesting a general glacial enhanced presence of Antarctic Intermediate Water, in agreement with previous studies from the Eastern Equatorial Pacific and the Southeast Pacific. However, the subsurface ocean salinity differs for both glacial stages, with fresher condition during the Last Glacial Maximum (LGM; ∼26.5-19 ka BP) and more saline condition during the Penultimate Glacial Maximum (PGM; ∼155-140 ka BP). The δ13C data also show contrasting conditions for both glacial time windows in the upper water column, with a large depletion of 0.37‰ in δ13C from the LGM values, suggests a larger contribution of "old" low δ13C deep waters at intermediate depths at the study site during the PGM, plausibly due to stronger upwelling in high southern latitudes. The dissimilar scenarios between the LGM and the PGM may have been caused by processes that are analogous to the phase-switch in modern day Southern Annular Mode. |
format |
Dataset |
author |
Tapia, Raúl Nürnberg, Dirk Ho, Sze Ling Lamy, Frank Ullermann, Johannes Gersonde, Rainer Tiedemann, Ralf |
author_facet |
Tapia, Raúl Nürnberg, Dirk Ho, Sze Ling Lamy, Frank Ullermann, Johannes Gersonde, Rainer Tiedemann, Ralf |
author_sort |
Tapia, Raúl |
title |
Mg/Ca and isotopic data of sediment core PS75/059-2 |
title_short |
Mg/Ca and isotopic data of sediment core PS75/059-2 |
title_full |
Mg/Ca and isotopic data of sediment core PS75/059-2 |
title_fullStr |
Mg/Ca and isotopic data of sediment core PS75/059-2 |
title_full_unstemmed |
Mg/Ca and isotopic data of sediment core PS75/059-2 |
title_sort |
mg/ca and isotopic data of sediment core ps75/059-2 |
publisher |
PANGAEA |
publishDate |
2019 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.899276 https://doi.org/10.1594/PANGAEA.899276 |
op_coverage |
LATITUDE: -54.215000 * LONGITUDE: -125.425500 * DATE/TIME START: 2009-12-18T02:30:00 * DATE/TIME END: 2009-12-18T02:30:00 * MINIMUM ELEVATION: -3613.0 m * MAXIMUM ELEVATION: -3613.0 m |
long_lat |
ENVELOPE(-125.425500,-125.425500,-54.215000,-54.215000) |
geographic |
Antarctic Southern Ocean Pacific |
geographic_facet |
Antarctic Southern Ocean Pacific |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Supplement to: Tapia, Raúl; Nürnberg, Dirk; Ho, Sze Ling; Lamy, Frank; Ullermann, Johannes; Gersonde, Rainer; Tiedemann, Ralf (2019): Glacial differences of Southern Ocean Intermediate Waters in the Central South Pacific. Quaternary Science Reviews, 208, 105-117, https://doi.org/10.1016/j.quascirev.2019.01.016 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.899276 https://doi.org/10.1594/PANGAEA.899276 |
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.899276 https://doi.org/10.1016/j.quascirev.2019.01.016 |
_version_ |
1766276463596666880 |