Ecological and temperature controls on Mg/Ca ratios of Globigerina bulloides from the southwest Pacific Ocean
We present Mg/Ca data for Globigerina bulloides from 10 core top sites in the southwest Pacific Ocean analyzed by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS). Mg/Ca values in G. bulloides correlate with observed ocean temperatures (7 degrees C-19 degrees C), and when combi...
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Language: | English |
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Wiley-Blackwell
2011
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:cc7b1d6 2023-05-15T18:01:02+02:00 Ecological and temperature controls on Mg/Ca ratios of Globigerina bulloides from the southwest Pacific Ocean Marr, Julene P. Baker, Joel A. Carter, Lionel Allan, Aidan S. R. Dunbar, Gavin B. Bostock, Helen C. 2011-04-28 https://espace.library.uq.edu.au/view/UQ:cc7b1d6/thumbnail_UQcc7b1d6_OA_t.jpg https://espace.library.uq.edu.au/view/UQ:cc7b1d6/UQcc7b1d6_OA.pdf https://espace.library.uq.edu.au/view/UQ:cc7b1d6 eng eng Wiley-Blackwell doi:10.1029/2010pa002059 issn:0883-8305 orcid:0000-0002-8903-8958 Benthic Foraminiferal Mg/ca Sea-Surface Temperature Glacial-Interglacial Changes Orbulina-Universa Tests Planktonic-Foraminifera New-Zealand Cleaning Procedures Past Temperature Campbell Plateau Southern-Ocean 1910 Oceanography 1911 Palaeontology Journal Article 2011 ftunivqespace https://doi.org/10.1029/2010pa002059 2020-12-22T15:25:09Z We present Mg/Ca data for Globigerina bulloides from 10 core top sites in the southwest Pacific Ocean analyzed by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS). Mg/Ca values in G. bulloides correlate with observed ocean temperatures (7 degrees C-19 degrees C), and when combined with previously published data, an integrated Mg/Ca-temperature calibration for 7 degrees C-31 degrees C is derived where Mg/Ca (mmol/mol) = 0.955 x e(0.068 x T) (r(2) = 0.95). Significant variability of Mg/Ca values (20%-30%) was found for the four visible chambers of G. bulloides, with the final chamber consistently recording the lowest Mg/Ca and is interpreted, in part, to reflect changes in the depth habitat with ontogeny. Incipient and variable dissolution of the thin and fragile final chamber, and outermost layer concomitantly added to all chambers, caused by different cleaning techniques prior to solution-based ICPMS analyses, may explain the minor differences in previously published Mg/Ca-temperature calibrations for this species. If the lower Mg/Ca of the final chamber reflects changes in depth habitat, then LA-ICPMS of the penultimate (or older) chambers will most sensitively record past changes in near-surface ocean temperatures. Mean size-normalized G. bulloides test weights correlate negatively with ocean temperature (T = 31.8 x e(-30.5xwtN); r(2) = 0.90), suggesting that in the southwest Pacific Ocean, temperature is a prominent control on shell weight in addition to carbonate ion levels. Article in Journal/Newspaper Planktonic foraminifera Southern Ocean The University of Queensland: UQ eSpace Southern Ocean Pacific New Zealand Campbell Plateau ENVELOPE(171.000,171.000,-50.667,-50.667) Paleoceanography 26 2 n/a n/a |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Benthic Foraminiferal Mg/ca Sea-Surface Temperature Glacial-Interglacial Changes Orbulina-Universa Tests Planktonic-Foraminifera New-Zealand Cleaning Procedures Past Temperature Campbell Plateau Southern-Ocean 1910 Oceanography 1911 Palaeontology |
spellingShingle |
Benthic Foraminiferal Mg/ca Sea-Surface Temperature Glacial-Interglacial Changes Orbulina-Universa Tests Planktonic-Foraminifera New-Zealand Cleaning Procedures Past Temperature Campbell Plateau Southern-Ocean 1910 Oceanography 1911 Palaeontology Marr, Julene P. Baker, Joel A. Carter, Lionel Allan, Aidan S. R. Dunbar, Gavin B. Bostock, Helen C. Ecological and temperature controls on Mg/Ca ratios of Globigerina bulloides from the southwest Pacific Ocean |
topic_facet |
Benthic Foraminiferal Mg/ca Sea-Surface Temperature Glacial-Interglacial Changes Orbulina-Universa Tests Planktonic-Foraminifera New-Zealand Cleaning Procedures Past Temperature Campbell Plateau Southern-Ocean 1910 Oceanography 1911 Palaeontology |
description |
We present Mg/Ca data for Globigerina bulloides from 10 core top sites in the southwest Pacific Ocean analyzed by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS). Mg/Ca values in G. bulloides correlate with observed ocean temperatures (7 degrees C-19 degrees C), and when combined with previously published data, an integrated Mg/Ca-temperature calibration for 7 degrees C-31 degrees C is derived where Mg/Ca (mmol/mol) = 0.955 x e(0.068 x T) (r(2) = 0.95). Significant variability of Mg/Ca values (20%-30%) was found for the four visible chambers of G. bulloides, with the final chamber consistently recording the lowest Mg/Ca and is interpreted, in part, to reflect changes in the depth habitat with ontogeny. Incipient and variable dissolution of the thin and fragile final chamber, and outermost layer concomitantly added to all chambers, caused by different cleaning techniques prior to solution-based ICPMS analyses, may explain the minor differences in previously published Mg/Ca-temperature calibrations for this species. If the lower Mg/Ca of the final chamber reflects changes in depth habitat, then LA-ICPMS of the penultimate (or older) chambers will most sensitively record past changes in near-surface ocean temperatures. Mean size-normalized G. bulloides test weights correlate negatively with ocean temperature (T = 31.8 x e(-30.5xwtN); r(2) = 0.90), suggesting that in the southwest Pacific Ocean, temperature is a prominent control on shell weight in addition to carbonate ion levels. |
format |
Article in Journal/Newspaper |
author |
Marr, Julene P. Baker, Joel A. Carter, Lionel Allan, Aidan S. R. Dunbar, Gavin B. Bostock, Helen C. |
author_facet |
Marr, Julene P. Baker, Joel A. Carter, Lionel Allan, Aidan S. R. Dunbar, Gavin B. Bostock, Helen C. |
author_sort |
Marr, Julene P. |
title |
Ecological and temperature controls on Mg/Ca ratios of Globigerina bulloides from the southwest Pacific Ocean |
title_short |
Ecological and temperature controls on Mg/Ca ratios of Globigerina bulloides from the southwest Pacific Ocean |
title_full |
Ecological and temperature controls on Mg/Ca ratios of Globigerina bulloides from the southwest Pacific Ocean |
title_fullStr |
Ecological and temperature controls on Mg/Ca ratios of Globigerina bulloides from the southwest Pacific Ocean |
title_full_unstemmed |
Ecological and temperature controls on Mg/Ca ratios of Globigerina bulloides from the southwest Pacific Ocean |
title_sort |
ecological and temperature controls on mg/ca ratios of globigerina bulloides from the southwest pacific ocean |
publisher |
Wiley-Blackwell |
publishDate |
2011 |
url |
https://espace.library.uq.edu.au/view/UQ:cc7b1d6/thumbnail_UQcc7b1d6_OA_t.jpg https://espace.library.uq.edu.au/view/UQ:cc7b1d6/UQcc7b1d6_OA.pdf https://espace.library.uq.edu.au/view/UQ:cc7b1d6 |
long_lat |
ENVELOPE(171.000,171.000,-50.667,-50.667) |
geographic |
Southern Ocean Pacific New Zealand Campbell Plateau |
geographic_facet |
Southern Ocean Pacific New Zealand Campbell Plateau |
genre |
Planktonic foraminifera Southern Ocean |
genre_facet |
Planktonic foraminifera Southern Ocean |
op_relation |
doi:10.1029/2010pa002059 issn:0883-8305 orcid:0000-0002-8903-8958 |
op_doi |
https://doi.org/10.1029/2010pa002059 |
container_title |
Paleoceanography |
container_volume |
26 |
container_issue |
2 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766170356800815104 |