Calcification and growth processes in planktonic foraminifera complicate the use of B/Ca and U/Ca as carbonate chemistry proxies
© The Author(s), 2016. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Earth and Planetary Science Letters 449 (2016): 372-381, doi:10.1016/j.epsl.2016.05.016. Although boron and uranium to calcium ratios (B/Ca, U/Ca) i...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/8341 2023-05-15T17:36:44+02:00 Calcification and growth processes in planktonic foraminifera complicate the use of B/Ca and U/Ca as carbonate chemistry proxies Salmon, Kate H. Anand, Pallavi Sexton, Philip F. Conte, Maureen H. 2016-06-08 https://hdl.handle.net/1912/8341 en eng Elsevier https://doi.org/10.1016/j.epsl.2016.05.016 Earth and Planetary Science Letters 449 (2016): 372-381 https://hdl.handle.net/1912/8341 doi:10.1016/j.epsl.2016.05.016 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ CC-BY Earth and Planetary Science Letters 449 (2016): 372-381 doi:10.1016/j.epsl.2016.05.016 Planktonic foraminifera Boron Uranium Proxy Sediment trap Article 2016 ftwhoas https://doi.org/10.1016/j.epsl.2016.05.016 2022-05-28T22:59:41Z © The Author(s), 2016. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Earth and Planetary Science Letters 449 (2016): 372-381, doi:10.1016/j.epsl.2016.05.016. Although boron and uranium to calcium ratios (B/Ca, U/Ca) in planktonic foraminifera have recently received much attention as potential proxies for ocean carbonate chemistry, the extent of a carbonate chemistry control on these ratios remains contentious. Here, we use bi-weekly sediment trap samples collected from the subtropical North Atlantic in combination with measured oceanographic data from the same location to evaluate the dominant oceanographic controls on B/Ca and U/Ca in three depth-stratified species of planktonic foraminifera. We also test the control of biological, growth-related, processes on planktonic foraminiferal B and U incorporation by using foraminifer test area density (μg/μm2)(μg/μm2) (a monitor of test thickness) and test size from the same samples. B/Ca and U/Ca show little or no significant correlation with carbonate system parameters both within this study and in comparison with other published works. We provide the first evidence for a strong positive relationship between area density (test thickness) and B/Ca, and reveal that this is consistent in all species studied, suggesting a likely role for calcification in controlling boron partitioning into foraminiferal calcite. This finding is consistent with previous observations of less efficient discrimination against trace element ‘impurities’ (such as B), at higher calcification rates. We observe little or no dependency of B/Ca on test size. In marked contrast, we find that U/Ca displays a strong species-specific dependency on test size in all species, but no relationship with test thickness, implicating some other biological control (possibly related to growth), rather than a calcification control, on U incorporation into foraminiferal calcite. Our results caution against the use of B/Ca and U/Ca ... Article in Journal/Newspaper North Atlantic Planktonic foraminifera Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Earth and Planetary Science Letters 449 372 381 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Planktonic foraminifera Boron Uranium Proxy Sediment trap |
spellingShingle |
Planktonic foraminifera Boron Uranium Proxy Sediment trap Salmon, Kate H. Anand, Pallavi Sexton, Philip F. Conte, Maureen H. Calcification and growth processes in planktonic foraminifera complicate the use of B/Ca and U/Ca as carbonate chemistry proxies |
topic_facet |
Planktonic foraminifera Boron Uranium Proxy Sediment trap |
description |
© The Author(s), 2016. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Earth and Planetary Science Letters 449 (2016): 372-381, doi:10.1016/j.epsl.2016.05.016. Although boron and uranium to calcium ratios (B/Ca, U/Ca) in planktonic foraminifera have recently received much attention as potential proxies for ocean carbonate chemistry, the extent of a carbonate chemistry control on these ratios remains contentious. Here, we use bi-weekly sediment trap samples collected from the subtropical North Atlantic in combination with measured oceanographic data from the same location to evaluate the dominant oceanographic controls on B/Ca and U/Ca in three depth-stratified species of planktonic foraminifera. We also test the control of biological, growth-related, processes on planktonic foraminiferal B and U incorporation by using foraminifer test area density (μg/μm2)(μg/μm2) (a monitor of test thickness) and test size from the same samples. B/Ca and U/Ca show little or no significant correlation with carbonate system parameters both within this study and in comparison with other published works. We provide the first evidence for a strong positive relationship between area density (test thickness) and B/Ca, and reveal that this is consistent in all species studied, suggesting a likely role for calcification in controlling boron partitioning into foraminiferal calcite. This finding is consistent with previous observations of less efficient discrimination against trace element ‘impurities’ (such as B), at higher calcification rates. We observe little or no dependency of B/Ca on test size. In marked contrast, we find that U/Ca displays a strong species-specific dependency on test size in all species, but no relationship with test thickness, implicating some other biological control (possibly related to growth), rather than a calcification control, on U incorporation into foraminiferal calcite. Our results caution against the use of B/Ca and U/Ca ... |
format |
Article in Journal/Newspaper |
author |
Salmon, Kate H. Anand, Pallavi Sexton, Philip F. Conte, Maureen H. |
author_facet |
Salmon, Kate H. Anand, Pallavi Sexton, Philip F. Conte, Maureen H. |
author_sort |
Salmon, Kate H. |
title |
Calcification and growth processes in planktonic foraminifera complicate the use of B/Ca and U/Ca as carbonate chemistry proxies |
title_short |
Calcification and growth processes in planktonic foraminifera complicate the use of B/Ca and U/Ca as carbonate chemistry proxies |
title_full |
Calcification and growth processes in planktonic foraminifera complicate the use of B/Ca and U/Ca as carbonate chemistry proxies |
title_fullStr |
Calcification and growth processes in planktonic foraminifera complicate the use of B/Ca and U/Ca as carbonate chemistry proxies |
title_full_unstemmed |
Calcification and growth processes in planktonic foraminifera complicate the use of B/Ca and U/Ca as carbonate chemistry proxies |
title_sort |
calcification and growth processes in planktonic foraminifera complicate the use of b/ca and u/ca as carbonate chemistry proxies |
publisher |
Elsevier |
publishDate |
2016 |
url |
https://hdl.handle.net/1912/8341 |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_source |
Earth and Planetary Science Letters 449 (2016): 372-381 doi:10.1016/j.epsl.2016.05.016 |
op_relation |
https://doi.org/10.1016/j.epsl.2016.05.016 Earth and Planetary Science Letters 449 (2016): 372-381 https://hdl.handle.net/1912/8341 doi:10.1016/j.epsl.2016.05.016 |
op_rights |
Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.epsl.2016.05.016 |
container_title |
Earth and Planetary Science Letters |
container_volume |
449 |
container_start_page |
372 |
op_container_end_page |
381 |
_version_ |
1766136318469865472 |