Late Cenozoic sea-surface-temperature evolution of the South Atlantic Ocean
The supplement related to this article is available online at: https://doi.org/10.5194/cp-19-1931-2023-supplement. At present, a strong latitudinal sea-surface-temperature (SST) gradient of ∼ 16 ∘C exists across the Southern Ocean, maintained by the Antarctic Circumpolar Current (ACC) and a set of c...
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Language: | English |
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European Geosciences Union
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Online Access: | https://hdl.handle.net/10481/91619 https://doi.org/10.5194/cp-19-1931-2023 |
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ftunivgranada:oai:digibug.ugr.es:10481/91619 2024-06-09T07:40:13+00:00 Late Cenozoic sea-surface-temperature evolution of the South Atlantic Ocean Hoem, Frida S. López Quirós, Adrián Van de Lagemaat, Suzanna H.A. Etourneau, Johan Sicre, Marie-Alexandrine Escutia Dotti, Carlota Brinkhuis, Henk Peterse, Francien Sangiorgi, Francesca Bijl, Peter K. 2023-10-13 https://hdl.handle.net/10481/91619 https://doi.org/10.5194/cp-19-1931-2023 eng eng European Geosciences Union info:eu-repo/grantAgreement/ERC/OceanNice 802835 Clim. Past, 19, 1931–1949, 2023 [https://doi.org/10.5194/cp-19-1931-2023] https://hdl.handle.net/10481/91619 doi:10.5194/cp-19-1931-2023 Atribución 4.0 Internacional http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2023 ftunivgranada https://doi.org/10.5194/cp-19-1931-2023 2024-05-14T23:35:10Z The supplement related to this article is available online at: https://doi.org/10.5194/cp-19-1931-2023-supplement. At present, a strong latitudinal sea-surface-temperature (SST) gradient of ∼ 16 ∘C exists across the Southern Ocean, maintained by the Antarctic Circumpolar Current (ACC) and a set of complex frontal systems. Together with the Antarctic ice masses, this system has formed one of the most important global climate regulators. The timing of the onset of the ACC system, its development towards modern-day strength and the consequences for the latitudinal SST gradient around the southern Atlantic Ocean are still uncertain. Here we present new TEX86 (TetraEther indeX of tetraethers consisting of 86 carbon atoms)-derived SST records from two sites located east of Drake Passage (south-western South Atlantic) to assist in better understanding two critical time intervals of prominent climate transitions during the Cenozoic: the late Eocene–early Oligocene (Ocean Drilling Program, ODP, Site 696) and Middle–Late Miocene (IODP Site U1536) transitions. Our results show temperate conditions (20–11 ∘C) during the first time interval, with a weaker latitudinal SST gradient (∼ 8 ∘C) across the Atlantic sector of the Southern Ocean compared to present day. We ascribe the similarity in SSTs between Sites 696 and 511 in the late Eocene–early Oligocene South Atlantic to a persistent, strong subpolar gyre circulation connecting the sites, which can only exist in the absence of a strong throughflow across the Drake Passage. Surprisingly, the southern South Atlantic record Site 696 shows comparable SSTs (∼ 12–14 ∘C) during both the earliest Oligocene oxygen isotope step (EOIS, ∼ 33.65 Ma) and the Miocene Climatic Optimum (MCO, ∼ 16.5 Ma). Apparently, maximum Oligocene Antarctic ice volume could coexist with warm ice-proximal surface ocean conditions, while at similar ocean temperatures, the Middle Miocene Antarctic ice sheet was likely reduced. Only a few Middle–Late Miocene (discontinuous) high-latitude records exist due ... Article in Journal/Newspaper Antarc* Antarctic Drake Passage Ice Sheet South Atlantic Ocean Southern Ocean DIGIBUG: Repositorio Institucional de la Universidad de Granada Antarctic Southern Ocean The Antarctic Drake Passage Climate of the Past 19 10 1931 1949 |
institution |
Open Polar |
collection |
DIGIBUG: Repositorio Institucional de la Universidad de Granada |
op_collection_id |
ftunivgranada |
language |
English |
description |
The supplement related to this article is available online at: https://doi.org/10.5194/cp-19-1931-2023-supplement. At present, a strong latitudinal sea-surface-temperature (SST) gradient of ∼ 16 ∘C exists across the Southern Ocean, maintained by the Antarctic Circumpolar Current (ACC) and a set of complex frontal systems. Together with the Antarctic ice masses, this system has formed one of the most important global climate regulators. The timing of the onset of the ACC system, its development towards modern-day strength and the consequences for the latitudinal SST gradient around the southern Atlantic Ocean are still uncertain. Here we present new TEX86 (TetraEther indeX of tetraethers consisting of 86 carbon atoms)-derived SST records from two sites located east of Drake Passage (south-western South Atlantic) to assist in better understanding two critical time intervals of prominent climate transitions during the Cenozoic: the late Eocene–early Oligocene (Ocean Drilling Program, ODP, Site 696) and Middle–Late Miocene (IODP Site U1536) transitions. Our results show temperate conditions (20–11 ∘C) during the first time interval, with a weaker latitudinal SST gradient (∼ 8 ∘C) across the Atlantic sector of the Southern Ocean compared to present day. We ascribe the similarity in SSTs between Sites 696 and 511 in the late Eocene–early Oligocene South Atlantic to a persistent, strong subpolar gyre circulation connecting the sites, which can only exist in the absence of a strong throughflow across the Drake Passage. Surprisingly, the southern South Atlantic record Site 696 shows comparable SSTs (∼ 12–14 ∘C) during both the earliest Oligocene oxygen isotope step (EOIS, ∼ 33.65 Ma) and the Miocene Climatic Optimum (MCO, ∼ 16.5 Ma). Apparently, maximum Oligocene Antarctic ice volume could coexist with warm ice-proximal surface ocean conditions, while at similar ocean temperatures, the Middle Miocene Antarctic ice sheet was likely reduced. Only a few Middle–Late Miocene (discontinuous) high-latitude records exist due ... |
format |
Article in Journal/Newspaper |
author |
Hoem, Frida S. López Quirós, Adrián Van de Lagemaat, Suzanna H.A. Etourneau, Johan Sicre, Marie-Alexandrine Escutia Dotti, Carlota Brinkhuis, Henk Peterse, Francien Sangiorgi, Francesca Bijl, Peter K. |
spellingShingle |
Hoem, Frida S. López Quirós, Adrián Van de Lagemaat, Suzanna H.A. Etourneau, Johan Sicre, Marie-Alexandrine Escutia Dotti, Carlota Brinkhuis, Henk Peterse, Francien Sangiorgi, Francesca Bijl, Peter K. Late Cenozoic sea-surface-temperature evolution of the South Atlantic Ocean |
author_facet |
Hoem, Frida S. López Quirós, Adrián Van de Lagemaat, Suzanna H.A. Etourneau, Johan Sicre, Marie-Alexandrine Escutia Dotti, Carlota Brinkhuis, Henk Peterse, Francien Sangiorgi, Francesca Bijl, Peter K. |
author_sort |
Hoem, Frida S. |
title |
Late Cenozoic sea-surface-temperature evolution of the South Atlantic Ocean |
title_short |
Late Cenozoic sea-surface-temperature evolution of the South Atlantic Ocean |
title_full |
Late Cenozoic sea-surface-temperature evolution of the South Atlantic Ocean |
title_fullStr |
Late Cenozoic sea-surface-temperature evolution of the South Atlantic Ocean |
title_full_unstemmed |
Late Cenozoic sea-surface-temperature evolution of the South Atlantic Ocean |
title_sort |
late cenozoic sea-surface-temperature evolution of the south atlantic ocean |
publisher |
European Geosciences Union |
publishDate |
2023 |
url |
https://hdl.handle.net/10481/91619 https://doi.org/10.5194/cp-19-1931-2023 |
geographic |
Antarctic Southern Ocean The Antarctic Drake Passage |
geographic_facet |
Antarctic Southern Ocean The Antarctic Drake Passage |
genre |
Antarc* Antarctic Drake Passage Ice Sheet South Atlantic Ocean Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Ice Sheet South Atlantic Ocean Southern Ocean |
op_relation |
info:eu-repo/grantAgreement/ERC/OceanNice 802835 Clim. Past, 19, 1931–1949, 2023 [https://doi.org/10.5194/cp-19-1931-2023] https://hdl.handle.net/10481/91619 doi:10.5194/cp-19-1931-2023 |
op_rights |
Atribución 4.0 Internacional http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-19-1931-2023 |
container_title |
Climate of the Past |
container_volume |
19 |
container_issue |
10 |
container_start_page |
1931 |
op_container_end_page |
1949 |
_version_ |
1801383674543865856 |