Mg/Ca-temperature calibration of polar benthic foraminifera species for reconstruction of bottom water temperatures on the Antarctic shelf
Benthic foraminifera Mg/Ca is a well-established bottom water temperature (BWT) proxy used in paleoclimate studies. The relationship between Mg/Ca and BWT for numerous species has been determined using core-top and culturing studies. However, the scarcity of calcareous microfossils in Antarctic shel...
Published in: | Geochimica et Cosmochimica Acta |
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Pergamon-Elsevier Science
2020
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ftnerc:oai:nora.nerc.ac.uk:528001 2023-05-15T13:41:45+02:00 Mg/Ca-temperature calibration of polar benthic foraminifera species for reconstruction of bottom water temperatures on the Antarctic shelf Mawbey, Elaine M. Hendry, Katharine R. Greaves, Mervyn J. Hillenbrand, Claus-Dieter Kuhn, Gerhard Spencer-Jones, Charlotte L. McClymont, Erin L. Vadman, Kara J. Shevenell, Amelia E. Jernas, Patrycja E. Smith, James A. 2020-08-15 text http://nora.nerc.ac.uk/id/eprint/528001/ https://nora.nerc.ac.uk/id/eprint/528001/1/1-s2.0-S001670372030346X-main.pdf https://www.sciencedirect.com/science/article/pii/S001670372030346X en eng Pergamon-Elsevier Science https://nora.nerc.ac.uk/id/eprint/528001/1/1-s2.0-S001670372030346X-main.pdf Mawbey, Elaine M.; Hendry, Katharine R.; Greaves, Mervyn J.; Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Kuhn, Gerhard; Spencer-Jones, Charlotte L.; McClymont, Erin L.; Vadman, Kara J.; Shevenell, Amelia E.; Jernas, Patrycja E.; Smith, James A. orcid:0000-0002-1333-2544 . 2020 Mg/Ca-temperature calibration of polar benthic foraminifera species for reconstruction of bottom water temperatures on the Antarctic shelf. Geochimica et Cosmochimica Acta, 283. 54-66. https://doi.org/10.1016/j.gca.2020.05.027 <https://doi.org/10.1016/j.gca.2020.05.027> cc_by_4 CC-BY Publication - Article PeerReviewed 2020 ftnerc https://doi.org/10.1016/j.gca.2020.05.027 2023-02-04T19:50:47Z Benthic foraminifera Mg/Ca is a well-established bottom water temperature (BWT) proxy used in paleoclimate studies. The relationship between Mg/Ca and BWT for numerous species has been determined using core-top and culturing studies. However, the scarcity of calcareous microfossils in Antarctic shelf sediments and poorly defined calibrations at low temperatures has limited the use of the foraminiferal Mg/Ca paleothermometer in ice proximal Antarctic sediments. Here we present paired ocean temperature and modern benthic foraminifera Mg/Ca data for three species, Trifarina angulosa, Bulimina aculeata, and Globocassidulina subglobosa, but with a particular focus on Trifarina angulosa. The core-top data from several Antarctic sectors span a BWT range of −1.7 to +1.2 °C and constrain the relationship between Mg/Ca and cold temperatures. We compare our results to published lower-latitude core-top data for species in the same or related genera, and in the case of Trifarina angulosa, produce a regional calibration. The resulting regional equation for Trifarina angulosa is Temperature (°C) = (Mg/Ca −1.14 ± 0.035)/0.069 ± 0.033). Addition of our Trifarina angulosa data to the previously published Uvigerina spp. dataset provides an alternative global calibration, although some data points appear to be offset from this relationship and are discussed. Mg-temperature relationships for Bulimina aculeata and Globocassidulina subglobosa are also combined with previously published data to produce calibration equations of Temperature (°C) = (Mg/Ca-1.04 ± 0.07)/0.099 ± 0.01 and Temperature (°C) = (Mg/Ca-0.99 ± 0.03)/0.087 ± 0.01, respectively. These refined calibrations highlight the potential utility of benthic foraminifera Mg/Ca-paleothermometry for reconstructing past BWT in Antarctic margin settings. Article in Journal/Newspaper Antarc* Antarctic Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Geochimica et Cosmochimica Acta 283 54 66 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Benthic foraminifera Mg/Ca is a well-established bottom water temperature (BWT) proxy used in paleoclimate studies. The relationship between Mg/Ca and BWT for numerous species has been determined using core-top and culturing studies. However, the scarcity of calcareous microfossils in Antarctic shelf sediments and poorly defined calibrations at low temperatures has limited the use of the foraminiferal Mg/Ca paleothermometer in ice proximal Antarctic sediments. Here we present paired ocean temperature and modern benthic foraminifera Mg/Ca data for three species, Trifarina angulosa, Bulimina aculeata, and Globocassidulina subglobosa, but with a particular focus on Trifarina angulosa. The core-top data from several Antarctic sectors span a BWT range of −1.7 to +1.2 °C and constrain the relationship between Mg/Ca and cold temperatures. We compare our results to published lower-latitude core-top data for species in the same or related genera, and in the case of Trifarina angulosa, produce a regional calibration. The resulting regional equation for Trifarina angulosa is Temperature (°C) = (Mg/Ca −1.14 ± 0.035)/0.069 ± 0.033). Addition of our Trifarina angulosa data to the previously published Uvigerina spp. dataset provides an alternative global calibration, although some data points appear to be offset from this relationship and are discussed. Mg-temperature relationships for Bulimina aculeata and Globocassidulina subglobosa are also combined with previously published data to produce calibration equations of Temperature (°C) = (Mg/Ca-1.04 ± 0.07)/0.099 ± 0.01 and Temperature (°C) = (Mg/Ca-0.99 ± 0.03)/0.087 ± 0.01, respectively. These refined calibrations highlight the potential utility of benthic foraminifera Mg/Ca-paleothermometry for reconstructing past BWT in Antarctic margin settings. |
format |
Article in Journal/Newspaper |
author |
Mawbey, Elaine M. Hendry, Katharine R. Greaves, Mervyn J. Hillenbrand, Claus-Dieter Kuhn, Gerhard Spencer-Jones, Charlotte L. McClymont, Erin L. Vadman, Kara J. Shevenell, Amelia E. Jernas, Patrycja E. Smith, James A. |
spellingShingle |
Mawbey, Elaine M. Hendry, Katharine R. Greaves, Mervyn J. Hillenbrand, Claus-Dieter Kuhn, Gerhard Spencer-Jones, Charlotte L. McClymont, Erin L. Vadman, Kara J. Shevenell, Amelia E. Jernas, Patrycja E. Smith, James A. Mg/Ca-temperature calibration of polar benthic foraminifera species for reconstruction of bottom water temperatures on the Antarctic shelf |
author_facet |
Mawbey, Elaine M. Hendry, Katharine R. Greaves, Mervyn J. Hillenbrand, Claus-Dieter Kuhn, Gerhard Spencer-Jones, Charlotte L. McClymont, Erin L. Vadman, Kara J. Shevenell, Amelia E. Jernas, Patrycja E. Smith, James A. |
author_sort |
Mawbey, Elaine M. |
title |
Mg/Ca-temperature calibration of polar benthic foraminifera species for reconstruction of bottom water temperatures on the Antarctic shelf |
title_short |
Mg/Ca-temperature calibration of polar benthic foraminifera species for reconstruction of bottom water temperatures on the Antarctic shelf |
title_full |
Mg/Ca-temperature calibration of polar benthic foraminifera species for reconstruction of bottom water temperatures on the Antarctic shelf |
title_fullStr |
Mg/Ca-temperature calibration of polar benthic foraminifera species for reconstruction of bottom water temperatures on the Antarctic shelf |
title_full_unstemmed |
Mg/Ca-temperature calibration of polar benthic foraminifera species for reconstruction of bottom water temperatures on the Antarctic shelf |
title_sort |
mg/ca-temperature calibration of polar benthic foraminifera species for reconstruction of bottom water temperatures on the antarctic shelf |
publisher |
Pergamon-Elsevier Science |
publishDate |
2020 |
url |
http://nora.nerc.ac.uk/id/eprint/528001/ https://nora.nerc.ac.uk/id/eprint/528001/1/1-s2.0-S001670372030346X-main.pdf https://www.sciencedirect.com/science/article/pii/S001670372030346X |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://nora.nerc.ac.uk/id/eprint/528001/1/1-s2.0-S001670372030346X-main.pdf Mawbey, Elaine M.; Hendry, Katharine R.; Greaves, Mervyn J.; Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Kuhn, Gerhard; Spencer-Jones, Charlotte L.; McClymont, Erin L.; Vadman, Kara J.; Shevenell, Amelia E.; Jernas, Patrycja E.; Smith, James A. orcid:0000-0002-1333-2544 . 2020 Mg/Ca-temperature calibration of polar benthic foraminifera species for reconstruction of bottom water temperatures on the Antarctic shelf. Geochimica et Cosmochimica Acta, 283. 54-66. https://doi.org/10.1016/j.gca.2020.05.027 <https://doi.org/10.1016/j.gca.2020.05.027> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.gca.2020.05.027 |
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Geochimica et Cosmochimica Acta |
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283 |
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54 |
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1766156913547935744 |