Estimates of late Quaternary mode and intermediate water silicic acid concentration in the Pacific Southern Ocean
The Southern Ocean plays a critical role in the exchange of carbon between the ocean and atmosphere over glacial-interglacial timescales. Hypotheses used to explain late Quaternary variations in atmospheric carbon dioxide (CO2) implicate changes in the nutrient dynamics and circulation of the Southe...
Published in: | Earth and Planetary Science Letters |
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Language: | English |
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Online Access: | https://espace.library.uq.edu.au/view/UQ:6bfe625 |
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:6bfe625 2023-05-15T18:23:56+02:00 Estimates of late Quaternary mode and intermediate water silicic acid concentration in the Pacific Southern Ocean Rousseau, Jonathon Ellwood, Michael J. Bostock, Helen Neil, Helen 2016-04-01 https://espace.library.uq.edu.au/view/UQ:6bfe625 eng eng Elsevier doi:10.1016/j.epsl.2016.01.023 issn:0012-821X issn:1385-013X orcid:0000-0002-8903-8958 DP0770820 Last Glacial Maximum New-Zealand Atmospheric Co2 Isotopes Fractionation Iron Oceanography Productivity Ventilation Nutrients Journal Article 2016 ftunivqespace https://doi.org/10.1016/j.epsl.2016.01.023 2020-08-18T07:06:00Z The Southern Ocean plays a critical role in the exchange of carbon between the ocean and atmosphere over glacial-interglacial timescales. Hypotheses used to explain late Quaternary variations in atmospheric carbon dioxide (CO2) implicate changes in the nutrient dynamics and circulation of the Southern Ocean. Here we present silicon isotope (delta Si-30) records of late Quaternary sponges and diatoms from the NZ sector of the Southern Ocean. Analysis of our sponge delta Si-30 records strongly suggests that the silicic acid concentration at mode and intermediate depths was higher during the LGM and the deglacial period compared to the present day. Our diatom delta Si-30 record suggests biological productivity near of the Polar Front was greater during the deglacial period, but not significantly different during the LGM compared to the present day. Taking our dataset in context with other regional paleoceanographic records, we interpret the predicted elevation in LGM and deglacial silicic acid concentration to reflect a shoaling of water masses during the LGM and 'leakage' of excess Southern Ocean dissolved silicon during the deglacial period. (C) 2016 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Southern Ocean The University of Queensland: UQ eSpace Southern Ocean Pacific New Zealand Earth and Planetary Science Letters 439 101 108 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Last Glacial Maximum New-Zealand Atmospheric Co2 Isotopes Fractionation Iron Oceanography Productivity Ventilation Nutrients |
spellingShingle |
Last Glacial Maximum New-Zealand Atmospheric Co2 Isotopes Fractionation Iron Oceanography Productivity Ventilation Nutrients Rousseau, Jonathon Ellwood, Michael J. Bostock, Helen Neil, Helen Estimates of late Quaternary mode and intermediate water silicic acid concentration in the Pacific Southern Ocean |
topic_facet |
Last Glacial Maximum New-Zealand Atmospheric Co2 Isotopes Fractionation Iron Oceanography Productivity Ventilation Nutrients |
description |
The Southern Ocean plays a critical role in the exchange of carbon between the ocean and atmosphere over glacial-interglacial timescales. Hypotheses used to explain late Quaternary variations in atmospheric carbon dioxide (CO2) implicate changes in the nutrient dynamics and circulation of the Southern Ocean. Here we present silicon isotope (delta Si-30) records of late Quaternary sponges and diatoms from the NZ sector of the Southern Ocean. Analysis of our sponge delta Si-30 records strongly suggests that the silicic acid concentration at mode and intermediate depths was higher during the LGM and the deglacial period compared to the present day. Our diatom delta Si-30 record suggests biological productivity near of the Polar Front was greater during the deglacial period, but not significantly different during the LGM compared to the present day. Taking our dataset in context with other regional paleoceanographic records, we interpret the predicted elevation in LGM and deglacial silicic acid concentration to reflect a shoaling of water masses during the LGM and 'leakage' of excess Southern Ocean dissolved silicon during the deglacial period. (C) 2016 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Rousseau, Jonathon Ellwood, Michael J. Bostock, Helen Neil, Helen |
author_facet |
Rousseau, Jonathon Ellwood, Michael J. Bostock, Helen Neil, Helen |
author_sort |
Rousseau, Jonathon |
title |
Estimates of late Quaternary mode and intermediate water silicic acid concentration in the Pacific Southern Ocean |
title_short |
Estimates of late Quaternary mode and intermediate water silicic acid concentration in the Pacific Southern Ocean |
title_full |
Estimates of late Quaternary mode and intermediate water silicic acid concentration in the Pacific Southern Ocean |
title_fullStr |
Estimates of late Quaternary mode and intermediate water silicic acid concentration in the Pacific Southern Ocean |
title_full_unstemmed |
Estimates of late Quaternary mode and intermediate water silicic acid concentration in the Pacific Southern Ocean |
title_sort |
estimates of late quaternary mode and intermediate water silicic acid concentration in the pacific southern ocean |
publisher |
Elsevier |
publishDate |
2016 |
url |
https://espace.library.uq.edu.au/view/UQ:6bfe625 |
geographic |
Southern Ocean Pacific New Zealand |
geographic_facet |
Southern Ocean Pacific New Zealand |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
doi:10.1016/j.epsl.2016.01.023 issn:0012-821X issn:1385-013X orcid:0000-0002-8903-8958 DP0770820 |
op_doi |
https://doi.org/10.1016/j.epsl.2016.01.023 |
container_title |
Earth and Planetary Science Letters |
container_volume |
439 |
container_start_page |
101 |
op_container_end_page |
108 |
_version_ |
1766204134343573504 |