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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Digital Commons @ University of South Florida
2020
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Online Access: | https://digitalcommons.usf.edu/msc_facpub/2467 https://doi.org/10.1016/j.gca.2020.05.027 https://digitalcommons.usf.edu/context/msc_facpub/article/3478/viewcontent/1_s2.0_S001670372030346X_main.pdf |
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ftusouthflorida:oai:digitalcommons.usf.edu:msc_facpub-3478 2023-07-30T03:58:56+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. 2020-01-01T08:00:00Z application/pdf https://digitalcommons.usf.edu/msc_facpub/2467 https://doi.org/10.1016/j.gca.2020.05.027 https://digitalcommons.usf.edu/context/msc_facpub/article/3478/viewcontent/1_s2.0_S001670372030346X_main.pdf unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/2467 doi:10.1016/j.gca.2020.05.027 https://digitalcommons.usf.edu/context/msc_facpub/article/3478/viewcontent/1_s2.0_S001670372030346X_main.pdf http://creativecommons.org/licenses/by/4.0/ Marine Science Faculty Publications Mg/Ca-temperature calibration Benthic foraminifera Antarctica Paleotemperature reconstruction Core-tops Life Sciences article 2020 ftusouthflorida https://doi.org/10.1016/j.gca.2020.05.027 2023-07-13T21:07:39Z 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 Antarctica University of South Florida St. Petersburg: Digital USFSP Antarctic The Antarctic Geochimica et Cosmochimica Acta 283 54 66 |
institution |
Open Polar |
collection |
University of South Florida St. Petersburg: Digital USFSP |
op_collection_id |
ftusouthflorida |
language |
unknown |
topic |
Mg/Ca-temperature calibration Benthic foraminifera Antarctica Paleotemperature reconstruction Core-tops Life Sciences |
spellingShingle |
Mg/Ca-temperature calibration Benthic foraminifera Antarctica Paleotemperature reconstruction Core-tops Life Sciences 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 |
topic_facet |
Mg/Ca-temperature calibration Benthic foraminifera Antarctica Paleotemperature reconstruction Core-tops Life Sciences |
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. |
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 |
Digital Commons @ University of South Florida |
publishDate |
2020 |
url |
https://digitalcommons.usf.edu/msc_facpub/2467 https://doi.org/10.1016/j.gca.2020.05.027 https://digitalcommons.usf.edu/context/msc_facpub/article/3478/viewcontent/1_s2.0_S001670372030346X_main.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Marine Science Faculty Publications |
op_relation |
https://digitalcommons.usf.edu/msc_facpub/2467 doi:10.1016/j.gca.2020.05.027 https://digitalcommons.usf.edu/context/msc_facpub/article/3478/viewcontent/1_s2.0_S001670372030346X_main.pdf |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1016/j.gca.2020.05.027 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
283 |
container_start_page |
54 |
op_container_end_page |
66 |
_version_ |
1772809659186413568 |