Controls on stable isotope and trace metal uptake in Neogloboquadrina pachyderma (sinistral) from an Antarctic sea-ice environment
The polar foraminifera Neogloboquadrina pachyderma (sinistral) dominates assemblages from the high latitude Southern Ocean, which plays a key role in determining past climate due to the tight linkage between Antarctic temperature and atmospheric CO2. Here, we use N. pachyderma (s.) harvested from se...
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Online Access: | https://doi.org/10.1016/j.epsl.2008.11.026 https://ora.ox.ac.uk/objects/uuid:e48588d1-b080-4c3a-b876-d27fc59b5633 |
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ftuloxford:oai:ora.ox.ac.uk:uuid:e48588d1-b080-4c3a-b876-d27fc59b5633 2023-05-15T13:34:15+02:00 Controls on stable isotope and trace metal uptake in Neogloboquadrina pachyderma (sinistral) from an Antarctic sea-ice environment Hendry, K Rickaby, R Meredith, M Elderfield, H 2016-07-29 https://doi.org/10.1016/j.epsl.2008.11.026 https://ora.ox.ac.uk/objects/uuid:e48588d1-b080-4c3a-b876-d27fc59b5633 eng eng doi:10.1016/j.epsl.2008.11.026 https://ora.ox.ac.uk/objects/uuid:e48588d1-b080-4c3a-b876-d27fc59b5633 https://doi.org/10.1016/j.epsl.2008.11.026 info:eu-repo/semantics/embargoedAccess Journal article 2016 ftuloxford https://doi.org/10.1016/j.epsl.2008.11.026 2022-06-28T20:26:28Z The polar foraminifera Neogloboquadrina pachyderma (sinistral) dominates assemblages from the high latitude Southern Ocean, which plays a key role in determining past climate due to the tight linkage between Antarctic temperature and atmospheric CO2. Here, we use N. pachyderma (s.) harvested from sediment traps off the West Antarctic Peninsula to construct a seasonal time series for the calibration of calcite proxies in a high latitude seasonal sea-ice environment where temperature is decoupled from other environmental parameters. We have used a combination of δ18OCaCO3 and δ 13CCaCO3 to decipher the calcification temperature and salinity, which reflect that N. pachyderma (s.) live in surface waters throughout the year, and at the ice-water interface in austral winter. Further, our results demonstrate that the uptake of trace metals into N. pachyderma (s.) calcite is influenced by secondary environmental conditions in addition to temperature during periods of sea-ice cover. We propose an elevated carbonate ion concentration at the ice-water interface resulting from biological utilisation of CO2 could influence calcification in foraminifera. Our calculations suggest that for N. pachyderma (s.) Mg/Ca, Sr/Ca ratios and Li/Ca ratios are linear functions of calcification temperature and [CO32-]. N. pachyderma (s.) Mg/Ca ratios exhibit temperature sensitivity similar to previous studies (~ 10-20%/°C) and a sensitivity to [CO32-] of ~ 1%/μmol kg- 1. Sr/Ca ratios are less sensitive to environmental parameters, exhibiting ~ 5% increase/°C and ~ 0.5%/10 μmol kg- 1. The relationship between Li/Ca ratios and both temperature and [CO32-] is less significant with ~ 10% increase in Li/Ca ratio/°C and 10 μmol kg- 1. We show how a multi-proxy approach could be used to constrain past high latitude surface water temperature and [CO32-]. © 2008 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Neogloboquadrina pachyderma Sea ice Southern Ocean ORA - Oxford University Research Archive Antarctic Southern Ocean Antarctic Peninsula Austral Earth and Planetary Science Letters 278 1-2 67 77 |
institution |
Open Polar |
collection |
ORA - Oxford University Research Archive |
op_collection_id |
ftuloxford |
language |
English |
description |
The polar foraminifera Neogloboquadrina pachyderma (sinistral) dominates assemblages from the high latitude Southern Ocean, which plays a key role in determining past climate due to the tight linkage between Antarctic temperature and atmospheric CO2. Here, we use N. pachyderma (s.) harvested from sediment traps off the West Antarctic Peninsula to construct a seasonal time series for the calibration of calcite proxies in a high latitude seasonal sea-ice environment where temperature is decoupled from other environmental parameters. We have used a combination of δ18OCaCO3 and δ 13CCaCO3 to decipher the calcification temperature and salinity, which reflect that N. pachyderma (s.) live in surface waters throughout the year, and at the ice-water interface in austral winter. Further, our results demonstrate that the uptake of trace metals into N. pachyderma (s.) calcite is influenced by secondary environmental conditions in addition to temperature during periods of sea-ice cover. We propose an elevated carbonate ion concentration at the ice-water interface resulting from biological utilisation of CO2 could influence calcification in foraminifera. Our calculations suggest that for N. pachyderma (s.) Mg/Ca, Sr/Ca ratios and Li/Ca ratios are linear functions of calcification temperature and [CO32-]. N. pachyderma (s.) Mg/Ca ratios exhibit temperature sensitivity similar to previous studies (~ 10-20%/°C) and a sensitivity to [CO32-] of ~ 1%/μmol kg- 1. Sr/Ca ratios are less sensitive to environmental parameters, exhibiting ~ 5% increase/°C and ~ 0.5%/10 μmol kg- 1. The relationship between Li/Ca ratios and both temperature and [CO32-] is less significant with ~ 10% increase in Li/Ca ratio/°C and 10 μmol kg- 1. We show how a multi-proxy approach could be used to constrain past high latitude surface water temperature and [CO32-]. © 2008 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Hendry, K Rickaby, R Meredith, M Elderfield, H |
spellingShingle |
Hendry, K Rickaby, R Meredith, M Elderfield, H Controls on stable isotope and trace metal uptake in Neogloboquadrina pachyderma (sinistral) from an Antarctic sea-ice environment |
author_facet |
Hendry, K Rickaby, R Meredith, M Elderfield, H |
author_sort |
Hendry, K |
title |
Controls on stable isotope and trace metal uptake in Neogloboquadrina pachyderma (sinistral) from an Antarctic sea-ice environment |
title_short |
Controls on stable isotope and trace metal uptake in Neogloboquadrina pachyderma (sinistral) from an Antarctic sea-ice environment |
title_full |
Controls on stable isotope and trace metal uptake in Neogloboquadrina pachyderma (sinistral) from an Antarctic sea-ice environment |
title_fullStr |
Controls on stable isotope and trace metal uptake in Neogloboquadrina pachyderma (sinistral) from an Antarctic sea-ice environment |
title_full_unstemmed |
Controls on stable isotope and trace metal uptake in Neogloboquadrina pachyderma (sinistral) from an Antarctic sea-ice environment |
title_sort |
controls on stable isotope and trace metal uptake in neogloboquadrina pachyderma (sinistral) from an antarctic sea-ice environment |
publishDate |
2016 |
url |
https://doi.org/10.1016/j.epsl.2008.11.026 https://ora.ox.ac.uk/objects/uuid:e48588d1-b080-4c3a-b876-d27fc59b5633 |
geographic |
Antarctic Southern Ocean Antarctic Peninsula Austral |
geographic_facet |
Antarctic Southern Ocean Antarctic Peninsula Austral |
genre |
Antarc* Antarctic Antarctic Peninsula Neogloboquadrina pachyderma Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Neogloboquadrina pachyderma Sea ice Southern Ocean |
op_relation |
doi:10.1016/j.epsl.2008.11.026 https://ora.ox.ac.uk/objects/uuid:e48588d1-b080-4c3a-b876-d27fc59b5633 https://doi.org/10.1016/j.epsl.2008.11.026 |
op_rights |
info:eu-repo/semantics/embargoedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2008.11.026 |
container_title |
Earth and Planetary Science Letters |
container_volume |
278 |
container_issue |
1-2 |
container_start_page |
67 |
op_container_end_page |
77 |
_version_ |
1766050728640512000 |