Ventilation and expansion of intermediate and deep waters in the Southeast Pacific during the last termination
We investigate the geometry and ventilation of the water masses within bathyal depths (~1500 – ~2500 m) of the Southeast Pacific (SEP), inferring the lower depth limit variations of the Antarctic Intermediate Water (AAIW) since ~22 kyr cal. BP. We use three cores collected at the upper limit of the...
Published in: | Paleoceanography and Paleoclimatology |
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Language: | English |
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American Geophysical Union (AGU)
2020
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Online Access: | https://archimer.ifremer.fr/doc/00633/74469/74297.pdf https://archimer.ifremer.fr/doc/00633/74469/74298.pdf https://archimer.ifremer.fr/doc/00633/74469/74299.xlsx https://archimer.ifremer.fr/doc/00633/74469/74300.xlsx https://doi.org/10.1029/2019PA003743 https://archimer.ifremer.fr/doc/00633/74469/ |
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ftarchimer:oai:archimer.ifremer.fr:74469 2023-05-15T13:47:36+02:00 Ventilation and expansion of intermediate and deep waters in the Southeast Pacific during the last termination Haddam, N. A. Michel, E. Siani, G. Licari, L. Dewilde, F. 2020-07 application/pdf https://archimer.ifremer.fr/doc/00633/74469/74297.pdf https://archimer.ifremer.fr/doc/00633/74469/74298.pdf https://archimer.ifremer.fr/doc/00633/74469/74299.xlsx https://archimer.ifremer.fr/doc/00633/74469/74300.xlsx https://doi.org/10.1029/2019PA003743 https://archimer.ifremer.fr/doc/00633/74469/ eng eng American Geophysical Union (AGU) https://archimer.ifremer.fr/doc/00633/74469/74297.pdf https://archimer.ifremer.fr/doc/00633/74469/74298.pdf https://archimer.ifremer.fr/doc/00633/74469/74299.xlsx https://archimer.ifremer.fr/doc/00633/74469/74300.xlsx doi:10.1029/2019PA003743 https://archimer.ifremer.fr/doc/00633/74469/ info:eu-repo/semantics/openAccess restricted use Paleoceanography And Paleoclimatology (2572-4517) (American Geophysical Union (AGU)), 2020-07 , Vol. 35 , N. 7 , P. e2019PA003743 (16p.) text Publication info:eu-repo/semantics/article 2020 ftarchimer https://doi.org/10.1029/2019PA003743 2021-09-23T20:35:18Z We investigate the geometry and ventilation of the water masses within bathyal depths (~1500 – ~2500 m) of the Southeast Pacific (SEP), inferring the lower depth limit variations of the Antarctic Intermediate Water (AAIW) since ~22 kyr cal. BP. We use three cores collected at the upper limit of the Pacific Deep Waters, between 41°S and 49°S and one core at a greater depth within this same water mass, at 46°S. The benthic foraminiferal assemblages and carbon and oxygen isotopes are used to show strong linkages between the timing of the deglacial Southern Ocean upwelling events and changes in the vertical extension and ventilation of the AAIW. In accordance with local/sub‐local oxygen reconstructions, we propose at least 3 states of ventilation–AAIW vertical extension; i) the late glacial and the Antarctic Cold Reversal (ACR): AAIW depth‐limit shoals, as its formation zone moves northward, ii) the deglaciation (excluding the ACR): the [O2] enrichment of the AAIW and the dominance of benthic species Trifarina angulosa indicate ventilated AAIW, along with a deepening of its lower limit, iii) the Holocene: enhanced influence of the Pacific Deep Water at bathyal depths (1500‐2500 m) in the SEP north of ~46°S, and the Circumpolar Deep Water south of ~46°S. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Pacific Southern Ocean The Antarctic Paleoceanography and Paleoclimatology 35 7 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
We investigate the geometry and ventilation of the water masses within bathyal depths (~1500 – ~2500 m) of the Southeast Pacific (SEP), inferring the lower depth limit variations of the Antarctic Intermediate Water (AAIW) since ~22 kyr cal. BP. We use three cores collected at the upper limit of the Pacific Deep Waters, between 41°S and 49°S and one core at a greater depth within this same water mass, at 46°S. The benthic foraminiferal assemblages and carbon and oxygen isotopes are used to show strong linkages between the timing of the deglacial Southern Ocean upwelling events and changes in the vertical extension and ventilation of the AAIW. In accordance with local/sub‐local oxygen reconstructions, we propose at least 3 states of ventilation–AAIW vertical extension; i) the late glacial and the Antarctic Cold Reversal (ACR): AAIW depth‐limit shoals, as its formation zone moves northward, ii) the deglaciation (excluding the ACR): the [O2] enrichment of the AAIW and the dominance of benthic species Trifarina angulosa indicate ventilated AAIW, along with a deepening of its lower limit, iii) the Holocene: enhanced influence of the Pacific Deep Water at bathyal depths (1500‐2500 m) in the SEP north of ~46°S, and the Circumpolar Deep Water south of ~46°S. |
format |
Article in Journal/Newspaper |
author |
Haddam, N. A. Michel, E. Siani, G. Licari, L. Dewilde, F. |
spellingShingle |
Haddam, N. A. Michel, E. Siani, G. Licari, L. Dewilde, F. Ventilation and expansion of intermediate and deep waters in the Southeast Pacific during the last termination |
author_facet |
Haddam, N. A. Michel, E. Siani, G. Licari, L. Dewilde, F. |
author_sort |
Haddam, N. A. |
title |
Ventilation and expansion of intermediate and deep waters in the Southeast Pacific during the last termination |
title_short |
Ventilation and expansion of intermediate and deep waters in the Southeast Pacific during the last termination |
title_full |
Ventilation and expansion of intermediate and deep waters in the Southeast Pacific during the last termination |
title_fullStr |
Ventilation and expansion of intermediate and deep waters in the Southeast Pacific during the last termination |
title_full_unstemmed |
Ventilation and expansion of intermediate and deep waters in the Southeast Pacific during the last termination |
title_sort |
ventilation and expansion of intermediate and deep waters in the southeast pacific during the last termination |
publisher |
American Geophysical Union (AGU) |
publishDate |
2020 |
url |
https://archimer.ifremer.fr/doc/00633/74469/74297.pdf https://archimer.ifremer.fr/doc/00633/74469/74298.pdf https://archimer.ifremer.fr/doc/00633/74469/74299.xlsx https://archimer.ifremer.fr/doc/00633/74469/74300.xlsx https://doi.org/10.1029/2019PA003743 https://archimer.ifremer.fr/doc/00633/74469/ |
geographic |
Antarctic Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Paleoceanography And Paleoclimatology (2572-4517) (American Geophysical Union (AGU)), 2020-07 , Vol. 35 , N. 7 , P. e2019PA003743 (16p.) |
op_relation |
https://archimer.ifremer.fr/doc/00633/74469/74297.pdf https://archimer.ifremer.fr/doc/00633/74469/74298.pdf https://archimer.ifremer.fr/doc/00633/74469/74299.xlsx https://archimer.ifremer.fr/doc/00633/74469/74300.xlsx doi:10.1029/2019PA003743 https://archimer.ifremer.fr/doc/00633/74469/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2019PA003743 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
35 |
container_issue |
7 |
_version_ |
1766247518478270464 |