Arctic Ocean benthic foraminifera Mg/Ca ratios and global Mg/Ca-temperature calibrations: New constraints at low temperatures
We explore the use of Mg/Ca ratios in six Arctic Ocean benthic foraminifera species as bottom water palaeothermometers and expand published Mg/Ca-temperature calibrations to the coldest bottom temperatures (<1 °C). Foraminifera were analyzed in surface sediments at 27 sites in the Chukchi Sea, Ea...
Published in: | Geochimica et Cosmochimica Acta |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Meteoritical Society
2018
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/109925/ https://doi.org/10.1016/j.gca.2018.02.036 https://orca.cardiff.ac.uk/id/eprint/109925/7/1-s2.0-S0016703718301182-main.pdf |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:109925 2023-05-15T14:27:46+02:00 Arctic Ocean benthic foraminifera Mg/Ca ratios and global Mg/Ca-temperature calibrations: New constraints at low temperatures Barrientos, Natalia Lear, Caroline Jakobsson, Martin Stranne, Christian O'Regan, Matt Cronin, Thomas M. Gukov, Alexandr Y. Coxall, Helen K. 2018-09-02 application/pdf https://orca.cardiff.ac.uk/id/eprint/109925/ https://doi.org/10.1016/j.gca.2018.02.036 https://orca.cardiff.ac.uk/id/eprint/109925/7/1-s2.0-S0016703718301182-main.pdf en eng Meteoritical Society https://orca.cardiff.ac.uk/id/eprint/109925/7/1-s2.0-S0016703718301182-main.pdf Barrientos, Natalia, Lear, Caroline https://orca.cardiff.ac.uk/view/cardiffauthors/A048848V.html orcid:0000-0002-7533-4430 orcid:0000-0002-7533-4430, Jakobsson, Martin, Stranne, Christian, O'Regan, Matt, Cronin, Thomas M., Gukov, Alexandr Y. and Coxall, Helen K. 2018. Arctic Ocean benthic foraminifera Mg/Ca ratios and global Mg/Ca-temperature calibrations: New constraints at low temperatures. Geochimica et Cosmochimica Acta 236 , pp. 240-259. 10.1016/j.gca.2018.02.036 https://doi.org/10.1016/j.gca.2018.02.036 file https://orca.cardiff.ac.uk/id/eprint/109925/7/1-s2.0-S0016703718301182-main.pdf doi:10.1016/j.gca.2018.02.036 cc_by_nc_nd CC-BY-NC-ND Article PeerReviewed 2018 ftunivcardiff https://doi.org/10.1016/j.gca.2018.02.036 2022-10-27T22:43:36Z We explore the use of Mg/Ca ratios in six Arctic Ocean benthic foraminifera species as bottom water palaeothermometers and expand published Mg/Ca-temperature calibrations to the coldest bottom temperatures (<1 °C). Foraminifera were analyzed in surface sediments at 27 sites in the Chukchi Sea, East Siberian Sea, Laptev Sea, Lomonosov Ridge and Petermann Fjord. The sites span water depths of 52–1157 m and bottom water temperatures (BWT) of −1.8 to +0.9 °C. Benthic foraminifera were alive at time of collection, determined from Rose Bengal (RB) staining. Three infaunal and three epifaunal species were abundant enough for Mg/Ca analysis. As predicted by theory and empirical evidence, cold water Arctic Ocean benthic species produce low Mg/Ca ratios, the exception being the porcelaneous species Quinqueloculina arctica. Our new data provide important constraints at the cold end (<1 °C) when added to existing global datasets. The refined calibrations based on the new and published global data appear best supported for the infaunal species Nonionella labradorica (Mg/Ca = 1.325 ± 0.01 × e^(0.065 ± 0.01 × BWT), r2 = 0.9), Cassidulina neoteretis (Mg/Ca = 1.009 ± 0.02 × e^(0.042 ± 0.01 × BWT), r2 = 0.6) and Elphidium clavatum (Mg/Ca = 0.816 ± 0.06 + 0.125 ± 0.05 × BWT, r2 = 0.4). The latter is based on the new Arctic data only. This suggests that Arctic Ocean infaunal taxa are suitable for capturing at least relative and probably semi-quantitative past changes in BWT. Arctic Oridorsalis tener Mg/Ca data are combined with existing O. umbonatus Mg/Ca data from well saturated core-tops from other regions to produce a temperature calibration with minimal influence of bottom water carbonate saturation state (Mg/Ca = 1.317 ± 0.03 × e^(0.102 ± 0.01 BWT), r2 = 0.7). The same approach for Cibicidoides wuellerstorfi yields Mg/Ca = 1.043 ± 0.03 × e^(0.118 ± 0.1 BWT), r2 = 0.4. Mg/Ca ratios of the porcelaneous epifaunal species Q. arctica show a clear positive relationship between Mg/Ca and Δ[CO32−] indicating that this species is ... Article in Journal/Newspaper Arctic Arctic Arctic Ocean Chukchi Chukchi Sea East Siberian Sea Foraminifera* laptev Laptev Sea Lomonosov Ridge Petermann Fjord Cardiff University: ORCA (Online Research @ Cardiff) Arctic Arctic Ocean Chukchi Sea East Siberian Sea ENVELOPE(166.000,166.000,74.000,74.000) Laptev Sea Petermann Fjord ENVELOPE(-61.500,-61.500,81.167,81.167) Geochimica et Cosmochimica Acta 236 240 259 |
institution |
Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
English |
description |
We explore the use of Mg/Ca ratios in six Arctic Ocean benthic foraminifera species as bottom water palaeothermometers and expand published Mg/Ca-temperature calibrations to the coldest bottom temperatures (<1 °C). Foraminifera were analyzed in surface sediments at 27 sites in the Chukchi Sea, East Siberian Sea, Laptev Sea, Lomonosov Ridge and Petermann Fjord. The sites span water depths of 52–1157 m and bottom water temperatures (BWT) of −1.8 to +0.9 °C. Benthic foraminifera were alive at time of collection, determined from Rose Bengal (RB) staining. Three infaunal and three epifaunal species were abundant enough for Mg/Ca analysis. As predicted by theory and empirical evidence, cold water Arctic Ocean benthic species produce low Mg/Ca ratios, the exception being the porcelaneous species Quinqueloculina arctica. Our new data provide important constraints at the cold end (<1 °C) when added to existing global datasets. The refined calibrations based on the new and published global data appear best supported for the infaunal species Nonionella labradorica (Mg/Ca = 1.325 ± 0.01 × e^(0.065 ± 0.01 × BWT), r2 = 0.9), Cassidulina neoteretis (Mg/Ca = 1.009 ± 0.02 × e^(0.042 ± 0.01 × BWT), r2 = 0.6) and Elphidium clavatum (Mg/Ca = 0.816 ± 0.06 + 0.125 ± 0.05 × BWT, r2 = 0.4). The latter is based on the new Arctic data only. This suggests that Arctic Ocean infaunal taxa are suitable for capturing at least relative and probably semi-quantitative past changes in BWT. Arctic Oridorsalis tener Mg/Ca data are combined with existing O. umbonatus Mg/Ca data from well saturated core-tops from other regions to produce a temperature calibration with minimal influence of bottom water carbonate saturation state (Mg/Ca = 1.317 ± 0.03 × e^(0.102 ± 0.01 BWT), r2 = 0.7). The same approach for Cibicidoides wuellerstorfi yields Mg/Ca = 1.043 ± 0.03 × e^(0.118 ± 0.1 BWT), r2 = 0.4. Mg/Ca ratios of the porcelaneous epifaunal species Q. arctica show a clear positive relationship between Mg/Ca and Δ[CO32−] indicating that this species is ... |
format |
Article in Journal/Newspaper |
author |
Barrientos, Natalia Lear, Caroline Jakobsson, Martin Stranne, Christian O'Regan, Matt Cronin, Thomas M. Gukov, Alexandr Y. Coxall, Helen K. |
spellingShingle |
Barrientos, Natalia Lear, Caroline Jakobsson, Martin Stranne, Christian O'Regan, Matt Cronin, Thomas M. Gukov, Alexandr Y. Coxall, Helen K. Arctic Ocean benthic foraminifera Mg/Ca ratios and global Mg/Ca-temperature calibrations: New constraints at low temperatures |
author_facet |
Barrientos, Natalia Lear, Caroline Jakobsson, Martin Stranne, Christian O'Regan, Matt Cronin, Thomas M. Gukov, Alexandr Y. Coxall, Helen K. |
author_sort |
Barrientos, Natalia |
title |
Arctic Ocean benthic foraminifera Mg/Ca ratios and global Mg/Ca-temperature calibrations: New constraints at low temperatures |
title_short |
Arctic Ocean benthic foraminifera Mg/Ca ratios and global Mg/Ca-temperature calibrations: New constraints at low temperatures |
title_full |
Arctic Ocean benthic foraminifera Mg/Ca ratios and global Mg/Ca-temperature calibrations: New constraints at low temperatures |
title_fullStr |
Arctic Ocean benthic foraminifera Mg/Ca ratios and global Mg/Ca-temperature calibrations: New constraints at low temperatures |
title_full_unstemmed |
Arctic Ocean benthic foraminifera Mg/Ca ratios and global Mg/Ca-temperature calibrations: New constraints at low temperatures |
title_sort |
arctic ocean benthic foraminifera mg/ca ratios and global mg/ca-temperature calibrations: new constraints at low temperatures |
publisher |
Meteoritical Society |
publishDate |
2018 |
url |
https://orca.cardiff.ac.uk/id/eprint/109925/ https://doi.org/10.1016/j.gca.2018.02.036 https://orca.cardiff.ac.uk/id/eprint/109925/7/1-s2.0-S0016703718301182-main.pdf |
long_lat |
ENVELOPE(166.000,166.000,74.000,74.000) ENVELOPE(-61.500,-61.500,81.167,81.167) |
geographic |
Arctic Arctic Ocean Chukchi Sea East Siberian Sea Laptev Sea Petermann Fjord |
geographic_facet |
Arctic Arctic Ocean Chukchi Sea East Siberian Sea Laptev Sea Petermann Fjord |
genre |
Arctic Arctic Arctic Ocean Chukchi Chukchi Sea East Siberian Sea Foraminifera* laptev Laptev Sea Lomonosov Ridge Petermann Fjord |
genre_facet |
Arctic Arctic Arctic Ocean Chukchi Chukchi Sea East Siberian Sea Foraminifera* laptev Laptev Sea Lomonosov Ridge Petermann Fjord |
op_relation |
https://orca.cardiff.ac.uk/id/eprint/109925/7/1-s2.0-S0016703718301182-main.pdf Barrientos, Natalia, Lear, Caroline https://orca.cardiff.ac.uk/view/cardiffauthors/A048848V.html orcid:0000-0002-7533-4430 orcid:0000-0002-7533-4430, Jakobsson, Martin, Stranne, Christian, O'Regan, Matt, Cronin, Thomas M., Gukov, Alexandr Y. and Coxall, Helen K. 2018. Arctic Ocean benthic foraminifera Mg/Ca ratios and global Mg/Ca-temperature calibrations: New constraints at low temperatures. Geochimica et Cosmochimica Acta 236 , pp. 240-259. 10.1016/j.gca.2018.02.036 https://doi.org/10.1016/j.gca.2018.02.036 file https://orca.cardiff.ac.uk/id/eprint/109925/7/1-s2.0-S0016703718301182-main.pdf doi:10.1016/j.gca.2018.02.036 |
op_rights |
cc_by_nc_nd |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.gca.2018.02.036 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
236 |
container_start_page |
240 |
op_container_end_page |
259 |
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1766301670776504320 |