Disparities in glacial advection of Southern Ocean Intermediate Water to the South Pacific Gyre
The Intermediate Waters formed in the Southern Ocean are critical for ventilating the thermocline in the Southern Hemisphere Gyres and transporting climatic signals from high to low latitudes on glacial- interglacial time-scales. Despite the importance of the Southern Ocean Intermediate Waters (SOIW...
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ftawi:oai:epic.awi.de:36731 2023-05-15T18:00:56+02:00 Disparities in glacial advection of Southern Ocean Intermediate Water to the South Pacific Gyre Tapia, Raul Nürnberg, Dirk Ronge, Thomas Tiedemann, Ralf 2015-01-15 https://epic.awi.de/id/eprint/36731/ https://hdl.handle.net/10013/epic.44501 unknown ELSEVIER SCIENCE BV Tapia, R. , Nürnberg, D. , Ronge, T. orcid:0000-0003-2625-719X and Tiedemann, R. orcid:0000-0001-7211-8049 (2015) Disparities in glacial advection of Southern Ocean Intermediate Water to the South Pacific Gyre , Earth and Planetary Science Letters, 410 , pp. 152-164 . doi:10.1016/j.epsl.2014.11.031 <https://doi.org/10.1016/j.epsl.2014.11.031> , hdl:10013/epic.44501 EPIC3Earth and Planetary Science Letters, ELSEVIER SCIENCE BV, 410, pp. 152-164, ISSN: 0012-821X Article isiRev 2015 ftawi https://doi.org/10.1016/j.epsl.2014.11.031 2021-12-24T15:40:00Z The Intermediate Waters formed in the Southern Ocean are critical for ventilating the thermocline in the Southern Hemisphere Gyres and transporting climatic signals from high to low latitudes on glacial- interglacial time-scales. Despite the importance of the Southern Ocean Intermediate Waters (SOIWs), information on past changes in SOIWs formation is fragmentary, and its impact on the South Pacific Gyre (SPG)’s thermocline largely unknown. Here, we present a 200 kyr record of paired Mg/Ca ratios and stable oxygen isotope from surface and deep dwelling planktonic foraminifera, from the SPG. On average, the Globigerina bulloides Mg/Ca-derived sea surface temperatures show similar conditions during the LGM and Marine Isotope Stage (MIS) 6 (9.4 ◦ C versus 9.8 ◦ C). In contrast, the subsurface temperatures derived from the Mg/Ca values of Globorotalia inflata and Globorotalia truncatulinoides suggest that LGM is ∼3 to ∼2 ◦C colder than MIS 6. Furthermore, at subsurface depths the reconstructed δ18Osw-ivc record (proxy for relative local salinity changes) suggests opposite glacial conditions, with slightly saltier- than-Holocene waters during MIS 6, and fresher-than-Holocene waters during LGM. Contrasting glacial scenarios, plausibly due to changes in the presence of SOIWs at the study site, suggest variable formation and/or advection of SOIWs to the SPG during different glacial stages. The variability in SOIWs is probably driven by the changes in the intensity of the Southern Westerly Winds. Article in Journal/Newspaper Planktonic foraminifera Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Pacific Southern Ocean Earth and Planetary Science Letters 410 152 164 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
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description |
The Intermediate Waters formed in the Southern Ocean are critical for ventilating the thermocline in the Southern Hemisphere Gyres and transporting climatic signals from high to low latitudes on glacial- interglacial time-scales. Despite the importance of the Southern Ocean Intermediate Waters (SOIWs), information on past changes in SOIWs formation is fragmentary, and its impact on the South Pacific Gyre (SPG)’s thermocline largely unknown. Here, we present a 200 kyr record of paired Mg/Ca ratios and stable oxygen isotope from surface and deep dwelling planktonic foraminifera, from the SPG. On average, the Globigerina bulloides Mg/Ca-derived sea surface temperatures show similar conditions during the LGM and Marine Isotope Stage (MIS) 6 (9.4 ◦ C versus 9.8 ◦ C). In contrast, the subsurface temperatures derived from the Mg/Ca values of Globorotalia inflata and Globorotalia truncatulinoides suggest that LGM is ∼3 to ∼2 ◦C colder than MIS 6. Furthermore, at subsurface depths the reconstructed δ18Osw-ivc record (proxy for relative local salinity changes) suggests opposite glacial conditions, with slightly saltier- than-Holocene waters during MIS 6, and fresher-than-Holocene waters during LGM. Contrasting glacial scenarios, plausibly due to changes in the presence of SOIWs at the study site, suggest variable formation and/or advection of SOIWs to the SPG during different glacial stages. The variability in SOIWs is probably driven by the changes in the intensity of the Southern Westerly Winds. |
format |
Article in Journal/Newspaper |
author |
Tapia, Raul Nürnberg, Dirk Ronge, Thomas Tiedemann, Ralf |
spellingShingle |
Tapia, Raul Nürnberg, Dirk Ronge, Thomas Tiedemann, Ralf Disparities in glacial advection of Southern Ocean Intermediate Water to the South Pacific Gyre |
author_facet |
Tapia, Raul Nürnberg, Dirk Ronge, Thomas Tiedemann, Ralf |
author_sort |
Tapia, Raul |
title |
Disparities in glacial advection of Southern Ocean Intermediate Water to the South Pacific Gyre |
title_short |
Disparities in glacial advection of Southern Ocean Intermediate Water to the South Pacific Gyre |
title_full |
Disparities in glacial advection of Southern Ocean Intermediate Water to the South Pacific Gyre |
title_fullStr |
Disparities in glacial advection of Southern Ocean Intermediate Water to the South Pacific Gyre |
title_full_unstemmed |
Disparities in glacial advection of Southern Ocean Intermediate Water to the South Pacific Gyre |
title_sort |
disparities in glacial advection of southern ocean intermediate water to the south pacific gyre |
publisher |
ELSEVIER SCIENCE BV |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/36731/ https://hdl.handle.net/10013/epic.44501 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Planktonic foraminifera Southern Ocean |
genre_facet |
Planktonic foraminifera Southern Ocean |
op_source |
EPIC3Earth and Planetary Science Letters, ELSEVIER SCIENCE BV, 410, pp. 152-164, ISSN: 0012-821X |
op_relation |
Tapia, R. , Nürnberg, D. , Ronge, T. orcid:0000-0003-2625-719X and Tiedemann, R. orcid:0000-0001-7211-8049 (2015) Disparities in glacial advection of Southern Ocean Intermediate Water to the South Pacific Gyre , Earth and Planetary Science Letters, 410 , pp. 152-164 . doi:10.1016/j.epsl.2014.11.031 <https://doi.org/10.1016/j.epsl.2014.11.031> , hdl:10013/epic.44501 |
op_doi |
https://doi.org/10.1016/j.epsl.2014.11.031 |
container_title |
Earth and Planetary Science Letters |
container_volume |
410 |
container_start_page |
152 |
op_container_end_page |
164 |
_version_ |
1766170223124152320 |