Sodium-Calcium Ratios in the Planktic Foraminifera Trilobatus Sacculifer as a Proxy for Sea Surface Salinity
Recent culture and field studies have found a significant positive correlation between seawater salinity and the incorporation of sodium into foraminiferal calcite, suggesting a potential new proxy for reconstructing past changes in sea surface salinity (SSS) (Mezger et al., 2016 and Bertlich et al....
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ftolddominionuni:oai:digitalcommons.odu.edu:oeas_etds-1176 2023-05-15T17:35:33+02:00 Sodium-Calcium Ratios in the Planktic Foraminifera Trilobatus Sacculifer as a Proxy for Sea Surface Salinity Watkins, Colton Steele 2020-12-01T08:00:00Z application/pdf https://digitalcommons.odu.edu/oeas_etds/176 https://digitalcommons.odu.edu/cgi/viewcontent.cgi?article=1176&context=oeas_etds unknown ODU Digital Commons https://digitalcommons.odu.edu/oeas_etds/176 https://digitalcommons.odu.edu/cgi/viewcontent.cgi?article=1176&context=oeas_etds In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). OES Theses and Dissertations Foraminifera Paleoceanography Proxy Salinity Sodium calcium Trilobatus sacculifer Biogeochemistry Climate Geochemistry text 2020 ftolddominionuni 2023-01-16T18:44:52Z Recent culture and field studies have found a significant positive correlation between seawater salinity and the incorporation of sodium into foraminiferal calcite, suggesting a potential new proxy for reconstructing past changes in sea surface salinity (SSS) (Mezger et al., 2016 and Bertlich et al., 2018). In order to test the applicability of this new proxy in an open-ocean setting, Na/Ca ratios in the planktic foraminifera Trilobatus sacculifer (T. sacculifer Na/Ca) were measured from a suite of sediment core tops spanning a natural salinity gradient from the North Atlantic subtropical gyre to the South Atlantic subtropical gyre. Initial results from nine core tops spanning a salinity range of 1.6 show a positive correlation between upper water column salinity and T. sacculifer Na/Ca (R2 = 0.81, p < 0.005). The data also suggest there is no relationship between T. sacculifer Na/Ca and shell weight, shell size, or habitat temperature, indicating that shell Na/Ca may be predominantly controlled by salinity. In addition, we generated a high-resolution downcore record of T. sacculifer Na/Ca variability over the last deglaciation from Florida Straits core JPC26. Results show good agreement between our new Na/Ca record with the previously published deglacial δ18Osw record that is also thought to reflect SSS variability from the same core (Schmidt and Lynch-Stieglitz, 2011). Both records indicate an abrupt increase in SSS during the Younger Dryas (11.7 – 12.9 kyr). Converting our new JPC26 T. sacculifer Na/Ca ratios to SSS using our Atlantic core top calibration indicates a maximum salinity change of ~2.2 across the last deglaciation. Text North Atlantic Old Dominion University: ODU Digital Commons Lynch ENVELOPE(-57.683,-57.683,-63.783,-63.783) |
institution |
Open Polar |
collection |
Old Dominion University: ODU Digital Commons |
op_collection_id |
ftolddominionuni |
language |
unknown |
topic |
Foraminifera Paleoceanography Proxy Salinity Sodium calcium Trilobatus sacculifer Biogeochemistry Climate Geochemistry |
spellingShingle |
Foraminifera Paleoceanography Proxy Salinity Sodium calcium Trilobatus sacculifer Biogeochemistry Climate Geochemistry Watkins, Colton Steele Sodium-Calcium Ratios in the Planktic Foraminifera Trilobatus Sacculifer as a Proxy for Sea Surface Salinity |
topic_facet |
Foraminifera Paleoceanography Proxy Salinity Sodium calcium Trilobatus sacculifer Biogeochemistry Climate Geochemistry |
description |
Recent culture and field studies have found a significant positive correlation between seawater salinity and the incorporation of sodium into foraminiferal calcite, suggesting a potential new proxy for reconstructing past changes in sea surface salinity (SSS) (Mezger et al., 2016 and Bertlich et al., 2018). In order to test the applicability of this new proxy in an open-ocean setting, Na/Ca ratios in the planktic foraminifera Trilobatus sacculifer (T. sacculifer Na/Ca) were measured from a suite of sediment core tops spanning a natural salinity gradient from the North Atlantic subtropical gyre to the South Atlantic subtropical gyre. Initial results from nine core tops spanning a salinity range of 1.6 show a positive correlation between upper water column salinity and T. sacculifer Na/Ca (R2 = 0.81, p < 0.005). The data also suggest there is no relationship between T. sacculifer Na/Ca and shell weight, shell size, or habitat temperature, indicating that shell Na/Ca may be predominantly controlled by salinity. In addition, we generated a high-resolution downcore record of T. sacculifer Na/Ca variability over the last deglaciation from Florida Straits core JPC26. Results show good agreement between our new Na/Ca record with the previously published deglacial δ18Osw record that is also thought to reflect SSS variability from the same core (Schmidt and Lynch-Stieglitz, 2011). Both records indicate an abrupt increase in SSS during the Younger Dryas (11.7 – 12.9 kyr). Converting our new JPC26 T. sacculifer Na/Ca ratios to SSS using our Atlantic core top calibration indicates a maximum salinity change of ~2.2 across the last deglaciation. |
format |
Text |
author |
Watkins, Colton Steele |
author_facet |
Watkins, Colton Steele |
author_sort |
Watkins, Colton Steele |
title |
Sodium-Calcium Ratios in the Planktic Foraminifera Trilobatus Sacculifer as a Proxy for Sea Surface Salinity |
title_short |
Sodium-Calcium Ratios in the Planktic Foraminifera Trilobatus Sacculifer as a Proxy for Sea Surface Salinity |
title_full |
Sodium-Calcium Ratios in the Planktic Foraminifera Trilobatus Sacculifer as a Proxy for Sea Surface Salinity |
title_fullStr |
Sodium-Calcium Ratios in the Planktic Foraminifera Trilobatus Sacculifer as a Proxy for Sea Surface Salinity |
title_full_unstemmed |
Sodium-Calcium Ratios in the Planktic Foraminifera Trilobatus Sacculifer as a Proxy for Sea Surface Salinity |
title_sort |
sodium-calcium ratios in the planktic foraminifera trilobatus sacculifer as a proxy for sea surface salinity |
publisher |
ODU Digital Commons |
publishDate |
2020 |
url |
https://digitalcommons.odu.edu/oeas_etds/176 https://digitalcommons.odu.edu/cgi/viewcontent.cgi?article=1176&context=oeas_etds |
long_lat |
ENVELOPE(-57.683,-57.683,-63.783,-63.783) |
geographic |
Lynch |
geographic_facet |
Lynch |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
OES Theses and Dissertations |
op_relation |
https://digitalcommons.odu.edu/oeas_etds/176 https://digitalcommons.odu.edu/cgi/viewcontent.cgi?article=1176&context=oeas_etds |
op_rights |
In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). |
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1766134754131836928 |