Benthic foraminifera stable isotopes and bottom water oxygen estimation from the chilean margin
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...
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ftdatacite:10.1594/pangaea.917846 2023-05-15T14:03:43+02:00 Benthic foraminifera stable isotopes and bottom water oxygen estimation from the chilean margin Haddam, Naoufel Michel, Elisabeth Siani, Giuseppe Licari, Laetitia Dewilde, Fabien 2020 application/zip https://dx.doi.org/10.1594/pangaea.917846 https://doi.pangaea.de/10.1594/PANGAEA.917846 en eng PANGAEA - Data Publisher for Earth & Environmental Science Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY benthic foraminifera stable isotopes bottom water oxygen qualitative reconstruction at intermediate depths chilean margin Collection of Datasets article Collection 2020 ftdatacite https://doi.org/10.1594/pangaea.917846 2022-03-10T10:50:44Z 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 DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean The Antarctic Pacific |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
benthic foraminifera stable isotopes bottom water oxygen qualitative reconstruction at intermediate depths chilean margin |
spellingShingle |
benthic foraminifera stable isotopes bottom water oxygen qualitative reconstruction at intermediate depths chilean margin Haddam, Naoufel Michel, Elisabeth Siani, Giuseppe Licari, Laetitia Dewilde, Fabien Benthic foraminifera stable isotopes and bottom water oxygen estimation from the chilean margin |
topic_facet |
benthic foraminifera stable isotopes bottom water oxygen qualitative reconstruction at intermediate depths chilean margin |
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, Naoufel Michel, Elisabeth Siani, Giuseppe Licari, Laetitia Dewilde, Fabien |
author_facet |
Haddam, Naoufel Michel, Elisabeth Siani, Giuseppe Licari, Laetitia Dewilde, Fabien |
author_sort |
Haddam, Naoufel |
title |
Benthic foraminifera stable isotopes and bottom water oxygen estimation from the chilean margin |
title_short |
Benthic foraminifera stable isotopes and bottom water oxygen estimation from the chilean margin |
title_full |
Benthic foraminifera stable isotopes and bottom water oxygen estimation from the chilean margin |
title_fullStr |
Benthic foraminifera stable isotopes and bottom water oxygen estimation from the chilean margin |
title_full_unstemmed |
Benthic foraminifera stable isotopes and bottom water oxygen estimation from the chilean margin |
title_sort |
benthic foraminifera stable isotopes and bottom water oxygen estimation from the chilean margin |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2020 |
url |
https://dx.doi.org/10.1594/pangaea.917846 https://doi.pangaea.de/10.1594/PANGAEA.917846 |
geographic |
Antarctic Southern Ocean The Antarctic Pacific |
geographic_facet |
Antarctic Southern Ocean The Antarctic Pacific |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.917846 |
_version_ |
1766274536974581760 |