Ostracode Mg/Ca paleothermometry in the North Atlantic and Arctic oceans: Evaluation of a carbonate ion effect
The reconstruction of deep-sea bottom water temperature (BWT) is important to assess the ocean's response to and role in orbital- and millennial-scale climate change. Deep-sea paleothermometry employs magnesium to calcium (Mg/Ca) ratios in calcitic benthic microfaunas (foraminifera, ostracodes)...
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D8MK6PM3 2023-05-15T14:46:37+02:00 Ostracode Mg/Ca paleothermometry in the North Atlantic and Arctic oceans: Evaluation of a carbonate ion effect Farmer, Jesse Robert Cronin, Thomas M. Dwyer, Gary S. 2012 https://doi.org/10.7916/D8MK6PM3 English eng https://doi.org/10.7916/D8MK6PM3 Paleoclimatology Articles 2012 ftcolumbiauniv https://doi.org/10.7916/D8MK6PM3 2019-04-04T08:08:11Z The reconstruction of deep-sea bottom water temperature (BWT) is important to assess the ocean's response to and role in orbital- and millennial-scale climate change. Deep-sea paleothermometry employs magnesium to calcium (Mg/Ca) ratios in calcitic benthic microfaunas (foraminifera, ostracodes) as a primary proxy method. Mg/Ca paleothermometry may, however, be complicated by bottom water carbonate ion chemistry, which might affect Mg/Ca ratios in shells. To address temperature and carbonate ion influence on Mg/Ca ratios, we studied Mg/Ca ratios in the benthic ostracode genus Krithe in the North Atlantic and Arctic oceans using a 686-specimen core top collection, including 412 previously unpublished analyses. Mg/Ca ratios are positively correlated to temperature in multiple species from the North Atlantic [BWT = (0.885 × Mg/Ca) − 5.69, r2 = 0.73] and for K. glacialis in the Arctic Ocean and Nordic Seas [BWT = (0.439 × Mg/Ca) − 5.14, r2 = 0.50], consistent with previously published calibrations. We found no evidence for a relationship between Krithe Mg/Ca and carbonate ion saturation in the North Atlantic Ocean, Nordic Seas, and Arctic Ocean, supporting the use of Krithe Mg/Ca for reconstructing past BWT. Article in Journal/Newspaper Arctic Arctic Ocean Climate change Foraminifera* Nordic Seas North Atlantic Columbia University: Academic Commons Arctic Arctic Ocean |
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Open Polar |
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Columbia University: Academic Commons |
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ftcolumbiauniv |
language |
English |
topic |
Paleoclimatology |
spellingShingle |
Paleoclimatology Farmer, Jesse Robert Cronin, Thomas M. Dwyer, Gary S. Ostracode Mg/Ca paleothermometry in the North Atlantic and Arctic oceans: Evaluation of a carbonate ion effect |
topic_facet |
Paleoclimatology |
description |
The reconstruction of deep-sea bottom water temperature (BWT) is important to assess the ocean's response to and role in orbital- and millennial-scale climate change. Deep-sea paleothermometry employs magnesium to calcium (Mg/Ca) ratios in calcitic benthic microfaunas (foraminifera, ostracodes) as a primary proxy method. Mg/Ca paleothermometry may, however, be complicated by bottom water carbonate ion chemistry, which might affect Mg/Ca ratios in shells. To address temperature and carbonate ion influence on Mg/Ca ratios, we studied Mg/Ca ratios in the benthic ostracode genus Krithe in the North Atlantic and Arctic oceans using a 686-specimen core top collection, including 412 previously unpublished analyses. Mg/Ca ratios are positively correlated to temperature in multiple species from the North Atlantic [BWT = (0.885 × Mg/Ca) − 5.69, r2 = 0.73] and for K. glacialis in the Arctic Ocean and Nordic Seas [BWT = (0.439 × Mg/Ca) − 5.14, r2 = 0.50], consistent with previously published calibrations. We found no evidence for a relationship between Krithe Mg/Ca and carbonate ion saturation in the North Atlantic Ocean, Nordic Seas, and Arctic Ocean, supporting the use of Krithe Mg/Ca for reconstructing past BWT. |
format |
Article in Journal/Newspaper |
author |
Farmer, Jesse Robert Cronin, Thomas M. Dwyer, Gary S. |
author_facet |
Farmer, Jesse Robert Cronin, Thomas M. Dwyer, Gary S. |
author_sort |
Farmer, Jesse Robert |
title |
Ostracode Mg/Ca paleothermometry in the North Atlantic and Arctic oceans: Evaluation of a carbonate ion effect |
title_short |
Ostracode Mg/Ca paleothermometry in the North Atlantic and Arctic oceans: Evaluation of a carbonate ion effect |
title_full |
Ostracode Mg/Ca paleothermometry in the North Atlantic and Arctic oceans: Evaluation of a carbonate ion effect |
title_fullStr |
Ostracode Mg/Ca paleothermometry in the North Atlantic and Arctic oceans: Evaluation of a carbonate ion effect |
title_full_unstemmed |
Ostracode Mg/Ca paleothermometry in the North Atlantic and Arctic oceans: Evaluation of a carbonate ion effect |
title_sort |
ostracode mg/ca paleothermometry in the north atlantic and arctic oceans: evaluation of a carbonate ion effect |
publishDate |
2012 |
url |
https://doi.org/10.7916/D8MK6PM3 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Climate change Foraminifera* Nordic Seas North Atlantic |
genre_facet |
Arctic Arctic Ocean Climate change Foraminifera* Nordic Seas North Atlantic |
op_relation |
https://doi.org/10.7916/D8MK6PM3 |
op_doi |
https://doi.org/10.7916/D8MK6PM3 |
_version_ |
1766317836773359616 |