Salinity control on Na incorporation into calcite tests of the planktonic foraminifera Trilobatus sacculifer – Evidence from culture experiments and surface sediments
The quantitative reconstruction of past seawater salinity has yet to be achieved and the search for a direct and independent salinity proxy is ongoing. Recent culture and field studies show a significant positive correlation of Na/Ca with salinity in benthic and planktonic foraminiferal calcite. For...
Main Authors: | , , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications (EGU)
2018
|
Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/42813/ https://oceanrep.geomar.de/id/eprint/42813/7/bg-15-5991-2018.pdf https://doi.org/10.5194/bg-2018-164 https://doi.org/10.5194/bg-15-5991-2018 |
id |
ftoceanrep:oai:oceanrep.geomar.de:42813 |
---|---|
record_format |
openpolar |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:42813 2023-05-15T18:00:59+02:00 Salinity control on Na incorporation into calcite tests of the planktonic foraminifera Trilobatus sacculifer – Evidence from culture experiments and surface sediments Bertlich, Jacqueline Nürnberg, Dirk Hathorne, Ed C. de Nooijer, Lennart J. Mezger, Eveline M. Kienast, Markus Nordhausen, Steffanie Reichart, Gert-Jan Schönfeld, Joachim Bijma, Jelle 2018-10-15 text https://oceanrep.geomar.de/id/eprint/42813/ https://oceanrep.geomar.de/id/eprint/42813/7/bg-15-5991-2018.pdf https://doi.org/10.5194/bg-2018-164 https://doi.org/10.5194/bg-15-5991-2018 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/42813/7/bg-15-5991-2018.pdf Bertlich, J., Nürnberg, D. , Hathorne, E. C. , de Nooijer, L. J., Mezger, E. M., Kienast, M., Nordhausen, S., Reichart, G. J., Schönfeld, J. and Bijma, J. (2018) Salinity control on Na incorporation into calcite tests of the planktonic foraminifera Trilobatus sacculifer – Evidence from culture experiments and surface sediments . Open Access Biogeosciences (BG), 15 (20). pp. 5991-6018. DOI 10.5194/bg-15-5991-2018 <https://doi.org/10.5194/bg-15-5991-2018>. doi:10.5194/bg-15-5991-2018 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2018 ftoceanrep https://doi.org/10.5194/bg-2018-16410.5194/bg-15-5991-2018 2023-04-07T15:39:27Z The quantitative reconstruction of past seawater salinity has yet to be achieved and the search for a direct and independent salinity proxy is ongoing. Recent culture and field studies show a significant positive correlation of Na/Ca with salinity in benthic and planktonic foraminiferal calcite. For accurate paleoceanographic reconstructions, consistent and reliable calibrations are necessary, which are still missing. In order to assess the reliability of foraminiferal Na/Ca as a direct proxy for seawater salinity, this study presents electron microprobe Na/Ca data, measured on cultured specimens of Trilobatus sacculifer. The culture experiments were conducted over a wide salinity range of 26 to 45, while temperature was kept constant. To further understand potential controlling factors of Na incorporation, measurements were also performed on foraminifera cultured at various temperatures in the range of 19.5 °C to 29.5 °C under constant salinity conditions. Foraminiferal Na/Ca ratios positively correlate with seawater salinity (Na/Caforam = 0.97 + 0.115 ⋅ Salinity, R = 0.97, p < 0.005). Temperature on the other hand exhibits no statistically significant relationship with Na/Ca ratios indicating salinity to be the dominant factor controlling Na incorporation. The culturing results are corroborated by measurements on T. sacculifer from Caribbean and Gulf of Guinea surface sediments. In conclusion, planktonic foraminiferal Na/Ca can be applied as a reliable proxy for reconstructing sea surface salinities, albeit species-specific calibrations might be necessary. Article in Journal/Newspaper Planktonic foraminifera OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The quantitative reconstruction of past seawater salinity has yet to be achieved and the search for a direct and independent salinity proxy is ongoing. Recent culture and field studies show a significant positive correlation of Na/Ca with salinity in benthic and planktonic foraminiferal calcite. For accurate paleoceanographic reconstructions, consistent and reliable calibrations are necessary, which are still missing. In order to assess the reliability of foraminiferal Na/Ca as a direct proxy for seawater salinity, this study presents electron microprobe Na/Ca data, measured on cultured specimens of Trilobatus sacculifer. The culture experiments were conducted over a wide salinity range of 26 to 45, while temperature was kept constant. To further understand potential controlling factors of Na incorporation, measurements were also performed on foraminifera cultured at various temperatures in the range of 19.5 °C to 29.5 °C under constant salinity conditions. Foraminiferal Na/Ca ratios positively correlate with seawater salinity (Na/Caforam = 0.97 + 0.115 ⋅ Salinity, R = 0.97, p < 0.005). Temperature on the other hand exhibits no statistically significant relationship with Na/Ca ratios indicating salinity to be the dominant factor controlling Na incorporation. The culturing results are corroborated by measurements on T. sacculifer from Caribbean and Gulf of Guinea surface sediments. In conclusion, planktonic foraminiferal Na/Ca can be applied as a reliable proxy for reconstructing sea surface salinities, albeit species-specific calibrations might be necessary. |
format |
Article in Journal/Newspaper |
author |
Bertlich, Jacqueline Nürnberg, Dirk Hathorne, Ed C. de Nooijer, Lennart J. Mezger, Eveline M. Kienast, Markus Nordhausen, Steffanie Reichart, Gert-Jan Schönfeld, Joachim Bijma, Jelle |
spellingShingle |
Bertlich, Jacqueline Nürnberg, Dirk Hathorne, Ed C. de Nooijer, Lennart J. Mezger, Eveline M. Kienast, Markus Nordhausen, Steffanie Reichart, Gert-Jan Schönfeld, Joachim Bijma, Jelle Salinity control on Na incorporation into calcite tests of the planktonic foraminifera Trilobatus sacculifer – Evidence from culture experiments and surface sediments |
author_facet |
Bertlich, Jacqueline Nürnberg, Dirk Hathorne, Ed C. de Nooijer, Lennart J. Mezger, Eveline M. Kienast, Markus Nordhausen, Steffanie Reichart, Gert-Jan Schönfeld, Joachim Bijma, Jelle |
author_sort |
Bertlich, Jacqueline |
title |
Salinity control on Na incorporation into calcite tests of the planktonic foraminifera Trilobatus sacculifer – Evidence from culture experiments and surface sediments |
title_short |
Salinity control on Na incorporation into calcite tests of the planktonic foraminifera Trilobatus sacculifer – Evidence from culture experiments and surface sediments |
title_full |
Salinity control on Na incorporation into calcite tests of the planktonic foraminifera Trilobatus sacculifer – Evidence from culture experiments and surface sediments |
title_fullStr |
Salinity control on Na incorporation into calcite tests of the planktonic foraminifera Trilobatus sacculifer – Evidence from culture experiments and surface sediments |
title_full_unstemmed |
Salinity control on Na incorporation into calcite tests of the planktonic foraminifera Trilobatus sacculifer – Evidence from culture experiments and surface sediments |
title_sort |
salinity control on na incorporation into calcite tests of the planktonic foraminifera trilobatus sacculifer – evidence from culture experiments and surface sediments |
publisher |
Copernicus Publications (EGU) |
publishDate |
2018 |
url |
https://oceanrep.geomar.de/id/eprint/42813/ https://oceanrep.geomar.de/id/eprint/42813/7/bg-15-5991-2018.pdf https://doi.org/10.5194/bg-2018-164 https://doi.org/10.5194/bg-15-5991-2018 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
https://oceanrep.geomar.de/id/eprint/42813/7/bg-15-5991-2018.pdf Bertlich, J., Nürnberg, D. , Hathorne, E. C. , de Nooijer, L. J., Mezger, E. M., Kienast, M., Nordhausen, S., Reichart, G. J., Schönfeld, J. and Bijma, J. (2018) Salinity control on Na incorporation into calcite tests of the planktonic foraminifera Trilobatus sacculifer – Evidence from culture experiments and surface sediments . Open Access Biogeosciences (BG), 15 (20). pp. 5991-6018. DOI 10.5194/bg-15-5991-2018 <https://doi.org/10.5194/bg-15-5991-2018>. doi:10.5194/bg-15-5991-2018 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-2018-16410.5194/bg-15-5991-2018 |
_version_ |
1766170276043685888 |