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. Fo...
Published in: | Biogeosciences |
---|---|
Main Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/bg-15-5991-2018 https://doaj.org/article/d5a6ae73bc7a4395bac226f271c14db6 |
id |
ftdoajarticles:oai:doaj.org/article:d5a6ae73bc7a4395bac226f271c14db6 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:d5a6ae73bc7a4395bac226f271c14db6 2023-05-15T18:01:00+02:00 Salinity control on Na incorporation into calcite tests of the planktonic foraminifera Trilobatus sacculifer – evidence from culture experiments and surface sediments J. Bertlich D. Nürnberg E. C. Hathorne L. J. de Nooijer E. M. Mezger M. Kienast S. Nordhausen G.-J. Reichart J. Schönfeld J. Bijma 2018-10-01T00:00:00Z https://doi.org/10.5194/bg-15-5991-2018 https://doaj.org/article/d5a6ae73bc7a4395bac226f271c14db6 EN eng Copernicus Publications https://www.biogeosciences.net/15/5991/2018/bg-15-5991-2018.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-15-5991-2018 1726-4170 1726-4189 https://doaj.org/article/d5a6ae73bc7a4395bac226f271c14db6 Biogeosciences, Vol 15, Pp 5991-6018 (2018) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2018 ftdoajarticles https://doi.org/10.5194/bg-15-5991-2018 2022-12-30T22:07:41Z 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 to 29.5 °C under constant salinity conditions. Foraminiferal Na∕Ca values positively correlate with seawater salinity (Na∕Ca T. sacculifer = 0.97+0.115 ⋅ salinity, R = 0.97, p < 0.005). Temperature, on the other hand, exhibits no statistically significant relationship with Na∕Ca values, indicating salinity to be one of the dominant factors controlling Na incorporation. The culturing results are corroborated by measurements on T. sacculifer from Caribbean and Gulf of Guinea surface sediments, indicating no dissolution effect on Na∕Ca in foraminiferal calcite with increasing water depth up to > 4 km. In conclusion, planktonic foraminiferal Na∕Ca can be applied as a potential proxy for reconstructing sea surface salinities, although species-specific calibrations might be necessary. Article in Journal/Newspaper Planktonic foraminifera Directory of Open Access Journals: DOAJ Articles Biogeosciences 15 20 5991 6018 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 J. Bertlich D. Nürnberg E. C. Hathorne L. J. de Nooijer E. M. Mezger M. Kienast S. Nordhausen G.-J. Reichart J. Schönfeld J. Bijma Salinity control on Na incorporation into calcite tests of the planktonic foraminifera Trilobatus sacculifer – evidence from culture experiments and surface sediments |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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 to 29.5 °C under constant salinity conditions. Foraminiferal Na∕Ca values positively correlate with seawater salinity (Na∕Ca T. sacculifer = 0.97+0.115 ⋅ salinity, R = 0.97, p < 0.005). Temperature, on the other hand, exhibits no statistically significant relationship with Na∕Ca values, indicating salinity to be one of the dominant factors controlling Na incorporation. The culturing results are corroborated by measurements on T. sacculifer from Caribbean and Gulf of Guinea surface sediments, indicating no dissolution effect on Na∕Ca in foraminiferal calcite with increasing water depth up to > 4 km. In conclusion, planktonic foraminiferal Na∕Ca can be applied as a potential proxy for reconstructing sea surface salinities, although species-specific calibrations might be necessary. |
format |
Article in Journal/Newspaper |
author |
J. Bertlich D. Nürnberg E. C. Hathorne L. J. de Nooijer E. M. Mezger M. Kienast S. Nordhausen G.-J. Reichart J. Schönfeld J. Bijma |
author_facet |
J. Bertlich D. Nürnberg E. C. Hathorne L. J. de Nooijer E. M. Mezger M. Kienast S. Nordhausen G.-J. Reichart J. Schönfeld J. Bijma |
author_sort |
J. Bertlich |
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 |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-15-5991-2018 https://doaj.org/article/d5a6ae73bc7a4395bac226f271c14db6 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Biogeosciences, Vol 15, Pp 5991-6018 (2018) |
op_relation |
https://www.biogeosciences.net/15/5991/2018/bg-15-5991-2018.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-15-5991-2018 1726-4170 1726-4189 https://doaj.org/article/d5a6ae73bc7a4395bac226f271c14db6 |
op_doi |
https://doi.org/10.5194/bg-15-5991-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
20 |
container_start_page |
5991 |
op_container_end_page |
6018 |
_version_ |
1766170306521595904 |