Controls on stable isotope and trace metal uptake in Neogloboquadrina pachyderma (sinistral) from an Antarctic sea-ice environment
Author Posting. © The Author(s), 2008. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Earth and Planetary Science Letters 278 (2009): 67-77, doi:10.1016/j.epsl.2008.11.0...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/4821 2023-05-15T13:53:14+02:00 Controls on stable isotope and trace metal uptake in Neogloboquadrina pachyderma (sinistral) from an Antarctic sea-ice environment Hendry, Katharine R. Rickaby, Rosalind E. M. Meredith, Michael P. Elderfield, Henry 2008-11 application/pdf https://hdl.handle.net/1912/4821 en eng https://doi.org/10.1016/j.epsl.2008.11.026 https://hdl.handle.net/1912/4821 N. pachyderma Isotopes Trace metals Sea-ice Carbonate ion Preprint 2008 ftwhoas https://doi.org/10.1016/j.epsl.2008.11.026 2022-05-28T22:58:27Z Author Posting. © The Author(s), 2008. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Earth and Planetary Science Letters 278 (2009): 67-77, doi:10.1016/j.epsl.2008.11.026. The polar foraminifera Neogloboquadrina pachyderma (sinistral) dominates assemblages from the high latitude Southern Ocean, which is a key region for paleoclimate studies. 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 δ13CCaCO3 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, during winter, 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. We suggest an elevated carbonate ion concentration at the ice-water interface resulting from biological utilisation CO2 could influence calcification in foraminifera. We demonstrate that for N. pachyderma (s.) Mg/Ca and Sr/Ca ratios are linear functions of calcification temperature and [CO32-]. N. pachyderma (s.) Mg/Ca ratios exhibit temperature sensitivity similar to previous studies (~ 10 % per °C) and a sensitivity to [CO32-] of ~ 1 % per μmol kg-1). Sr/Ca ratios are less sensitive to environmental parameters, exhibiting < 1% increase per °C and per 10 μmol kg-1. We show how a multi-proxy approach could be used to constrain past high latitude surface water temperature and [CO32-]. The work was funded as part of NERC Antarctic Funding Initiative AFI4-02. KRH is funded by NERC grant NER/S/A/2004/12390. Report Antarc* Antarctic Antarctic Peninsula Neogloboquadrina pachyderma Sea ice Southern Ocean Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic Antarctic Peninsula Austral Ner ENVELOPE(6.622,6.622,62.612,62.612) Southern Ocean Earth and Planetary Science Letters 278 1-2 67 77 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
N. pachyderma Isotopes Trace metals Sea-ice Carbonate ion |
spellingShingle |
N. pachyderma Isotopes Trace metals Sea-ice Carbonate ion Hendry, Katharine R. Rickaby, Rosalind E. M. Meredith, Michael P. Elderfield, Henry Controls on stable isotope and trace metal uptake in Neogloboquadrina pachyderma (sinistral) from an Antarctic sea-ice environment |
topic_facet |
N. pachyderma Isotopes Trace metals Sea-ice Carbonate ion |
description |
Author Posting. © The Author(s), 2008. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Earth and Planetary Science Letters 278 (2009): 67-77, doi:10.1016/j.epsl.2008.11.026. The polar foraminifera Neogloboquadrina pachyderma (sinistral) dominates assemblages from the high latitude Southern Ocean, which is a key region for paleoclimate studies. 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 δ13CCaCO3 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, during winter, 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. We suggest an elevated carbonate ion concentration at the ice-water interface resulting from biological utilisation CO2 could influence calcification in foraminifera. We demonstrate that for N. pachyderma (s.) Mg/Ca and Sr/Ca ratios are linear functions of calcification temperature and [CO32-]. N. pachyderma (s.) Mg/Ca ratios exhibit temperature sensitivity similar to previous studies (~ 10 % per °C) and a sensitivity to [CO32-] of ~ 1 % per μmol kg-1). Sr/Ca ratios are less sensitive to environmental parameters, exhibiting < 1% increase per °C and per 10 μmol kg-1. We show how a multi-proxy approach could be used to constrain past high latitude surface water temperature and [CO32-]. The work was funded as part of NERC Antarctic Funding Initiative AFI4-02. KRH is funded by NERC grant NER/S/A/2004/12390. |
format |
Report |
author |
Hendry, Katharine R. Rickaby, Rosalind E. M. Meredith, Michael P. Elderfield, Henry |
author_facet |
Hendry, Katharine R. Rickaby, Rosalind E. M. Meredith, Michael P. Elderfield, Henry |
author_sort |
Hendry, Katharine R. |
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 |
2008 |
url |
https://hdl.handle.net/1912/4821 |
long_lat |
ENVELOPE(6.622,6.622,62.612,62.612) |
geographic |
Antarctic Antarctic Peninsula Austral Ner Southern Ocean |
geographic_facet |
Antarctic Antarctic Peninsula Austral Ner Southern Ocean |
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 |
https://doi.org/10.1016/j.epsl.2008.11.026 https://hdl.handle.net/1912/4821 |
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_ |
1766258235691499520 |