Calibrating Trilobatus sacculifer Na/Ca Ratios From Atlantic Core-Tops as a Proxy for Sea Surface Salinity

Colton S. Watkins; Matthew W. Schmidt; Jennifer E. Hertzberg

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Calibrating Trilobatus sacculifer Na/Ca Ratios From Atlantic Core-Tops as a Proxy for Sea Surface Salinity

机译：Calibrating Trilobatus sacculifer Na/Ca Ratios From Atlantic Core-Tops as a Proxy for Sea Surface Salinity

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Recent studies found a positive correlation between seawater salinity and Na/Ca ratios in foraminiferal calcite, suggesting a potential new paleosalinity proxy (Bertlich et al., 2018, https:// doi.org/10.5194/bg-15-5991-2018; Hauzer et al., 2021, https://doi.org/10.1029/2021pa004218; Mezger et al., 2016, https://doi.org/10.1002/2016pa003052; Wit et al., 2013). To test this new proxy in an openocean setting, Na/Ca ratios from the surface-dwelling planktic foraminifera Trilobatus sacculifer were measured from a suite of nine sediment core-tops spanning from the North Atlantic subtropical gyre to the South Atlantic subtropical gyre across a salinity range of 1.6. Results show a positive correlation between habitat salinity (HS) and T. sacculifer Na/Ca (Na/Ca (mmol/mol) = 0.516 (HS (±0.17)) – 12.934; R~2 = 0.81, p < 0.005). We also find no relationship between T. sacculifer Na/Ca and sample size or habitat temperature, indicating Na/Ca is predominantly controlled by salinity. Additionally, we generate the first downcore record of sea surface salinity (SSS) in the Florida Straits over the last deglaciation based on T. sacculifer Na/Ca variability. Results show agreement between our Na/Ca record and a previously published deglacial δ~(18)O_(sw) record that is also thought to reflect SSS variability from the same core (Schmidt & Lynch-Stieglitz, 2011, https://doi.org/10.1029/2011PA002157). Both records indicate an abrupt increase in SSS during the Younger Dryas (11.7–12.9 kyr). Converting the Florida Straits T. sacculifer Na/Ca ratios to SSS using our new Atlantic core-top calibration indicates a maximum salinity change of ~2.2 across the last deglaciation, in agreement with modeling study estimates of salinity change across this period.

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《Paleoceanography》 |2021年第10期|e2021PA004277-1-e2021PA004277-14|共14页
作者
Colton S. Watkins; Matthew W. Schmidt; Jennifer E. Hertzberg;
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Department of Ocean & Earth Sciences, Old Dominion University, Norfolk, VA, USA;

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正文语种英语
中图分类海洋学;
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Calibrating Trilobatus sacculifer; Na/Ca Ratios; Sea Surface Salinity;

Calibrating Trilobatus sacculifer Na/Ca Ratios From Atlantic Core-Tops as a Proxy for Sea Surface Salinity

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