Silica cycling and isotopic composition in northern Marguerite Bay on the rapidly-warming western Antarctic Peninsula
The Southern Ocean is a key region for silica (Si) cycling, and the isotopic signatures established here influence the rest of the world's oceans. The climate and ecosystem of the Southern Ocean are changing rapidly, with the potential to impact Si cycling and isotope dynamics. This study exami...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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ftnerc:oai:nora.nerc.ac.uk:512418 2023-05-15T13:49:32+02:00 Silica cycling and isotopic composition in northern Marguerite Bay on the rapidly-warming western Antarctic Peninsula Annett, Amber L. Henley, Sian F. Venables, Hugh J. Meredith, Michael P. Clarke, Andrew Ganeshram, Raja S. 2017-05 text http://nora.nerc.ac.uk/id/eprint/512418/ https://nora.nerc.ac.uk/id/eprint/512418/1/Silica%20cycling%20and%20isotopic%20composition%20in%20northern%20Marguerite%20Bay%20AAM.pdf http://www.sciencedirect.com/science/article/pii/S0967064516302867 en eng Elsevier https://nora.nerc.ac.uk/id/eprint/512418/1/Silica%20cycling%20and%20isotopic%20composition%20in%20northern%20Marguerite%20Bay%20AAM.pdf Annett, Amber L.; Henley, Sian F.; Venables, Hugh J.; Meredith, Michael P. orcid:0000-0002-7342-7756 Clarke, Andrew orcid:0000-0002-7582-3074 Ganeshram, Raja S. 2017 Silica cycling and isotopic composition in northern Marguerite Bay on the rapidly-warming western Antarctic Peninsula. Deep Sea Research II: Topical Studies in Oceanography, 139. 132-142. https://doi.org/10.1016/j.dsr2.2016.09.006 <https://doi.org/10.1016/j.dsr2.2016.09.006> Publication - Article PeerReviewed 2017 ftnerc https://doi.org/10.1016/j.dsr2.2016.09.006 2023-02-04T19:42:27Z The Southern Ocean is a key region for silica (Si) cycling, and the isotopic signatures established here influence the rest of the world's oceans. The climate and ecosystem of the Southern Ocean are changing rapidly, with the potential to impact Si cycling and isotope dynamics. This study examines high-resolution time-series dataset of dissolved Si concentrations and isotopic signatures, particulate Si concentrations and diatom speciation at a coastal site on the western Antarctic Peninsula (WAP), in order to characterise changes in Si cycling with respect to changes occurring in productivity and diatom assemblages. Dissolved and particulate Si phases reflect the dominant control of biological uptake, and combined with isotopic fractionation were consistent with a season of low/intermediate productivity. Biogenic Si is tightly coupled to both chlorophyll and particulate organic carbon at the sampling site, consistent with diatom-dominated phytoplankton assemblages along the WAP. Variability in diatom speciation has a negligible impact on the isotopic signature of dissolved Si in surface waters, although this is unlikely to hold for sediments due to differential dissolution of diatom species. A continued decline in diatom productivity along the WAP would likely result in an increasing unused Si inventory, which can potentially feed back into Si-limited areas, promoting diatom growth and carbon drawdown further afield. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Southern Ocean Natural Environment Research Council: NERC Open Research Archive Antarctic Southern Ocean Antarctic Peninsula Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) Deep Sea Research Part II: Topical Studies in Oceanography 139 132 142 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
The Southern Ocean is a key region for silica (Si) cycling, and the isotopic signatures established here influence the rest of the world's oceans. The climate and ecosystem of the Southern Ocean are changing rapidly, with the potential to impact Si cycling and isotope dynamics. This study examines high-resolution time-series dataset of dissolved Si concentrations and isotopic signatures, particulate Si concentrations and diatom speciation at a coastal site on the western Antarctic Peninsula (WAP), in order to characterise changes in Si cycling with respect to changes occurring in productivity and diatom assemblages. Dissolved and particulate Si phases reflect the dominant control of biological uptake, and combined with isotopic fractionation were consistent with a season of low/intermediate productivity. Biogenic Si is tightly coupled to both chlorophyll and particulate organic carbon at the sampling site, consistent with diatom-dominated phytoplankton assemblages along the WAP. Variability in diatom speciation has a negligible impact on the isotopic signature of dissolved Si in surface waters, although this is unlikely to hold for sediments due to differential dissolution of diatom species. A continued decline in diatom productivity along the WAP would likely result in an increasing unused Si inventory, which can potentially feed back into Si-limited areas, promoting diatom growth and carbon drawdown further afield. |
format |
Article in Journal/Newspaper |
author |
Annett, Amber L. Henley, Sian F. Venables, Hugh J. Meredith, Michael P. Clarke, Andrew Ganeshram, Raja S. |
spellingShingle |
Annett, Amber L. Henley, Sian F. Venables, Hugh J. Meredith, Michael P. Clarke, Andrew Ganeshram, Raja S. Silica cycling and isotopic composition in northern Marguerite Bay on the rapidly-warming western Antarctic Peninsula |
author_facet |
Annett, Amber L. Henley, Sian F. Venables, Hugh J. Meredith, Michael P. Clarke, Andrew Ganeshram, Raja S. |
author_sort |
Annett, Amber L. |
title |
Silica cycling and isotopic composition in northern Marguerite Bay on the rapidly-warming western Antarctic Peninsula |
title_short |
Silica cycling and isotopic composition in northern Marguerite Bay on the rapidly-warming western Antarctic Peninsula |
title_full |
Silica cycling and isotopic composition in northern Marguerite Bay on the rapidly-warming western Antarctic Peninsula |
title_fullStr |
Silica cycling and isotopic composition in northern Marguerite Bay on the rapidly-warming western Antarctic Peninsula |
title_full_unstemmed |
Silica cycling and isotopic composition in northern Marguerite Bay on the rapidly-warming western Antarctic Peninsula |
title_sort |
silica cycling and isotopic composition in northern marguerite bay on the rapidly-warming western antarctic peninsula |
publisher |
Elsevier |
publishDate |
2017 |
url |
http://nora.nerc.ac.uk/id/eprint/512418/ https://nora.nerc.ac.uk/id/eprint/512418/1/Silica%20cycling%20and%20isotopic%20composition%20in%20northern%20Marguerite%20Bay%20AAM.pdf http://www.sciencedirect.com/science/article/pii/S0967064516302867 |
long_lat |
ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.000,-68.000,-68.500,-68.500) |
geographic |
Antarctic Southern Ocean Antarctic Peninsula Marguerite Marguerite Bay |
geographic_facet |
Antarctic Southern Ocean Antarctic Peninsula Marguerite Marguerite Bay |
genre |
Antarc* Antarctic Antarctic Peninsula Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Southern Ocean |
op_relation |
https://nora.nerc.ac.uk/id/eprint/512418/1/Silica%20cycling%20and%20isotopic%20composition%20in%20northern%20Marguerite%20Bay%20AAM.pdf Annett, Amber L.; Henley, Sian F.; Venables, Hugh J.; Meredith, Michael P. orcid:0000-0002-7342-7756 Clarke, Andrew orcid:0000-0002-7582-3074 Ganeshram, Raja S. 2017 Silica cycling and isotopic composition in northern Marguerite Bay on the rapidly-warming western Antarctic Peninsula. Deep Sea Research II: Topical Studies in Oceanography, 139. 132-142. https://doi.org/10.1016/j.dsr2.2016.09.006 <https://doi.org/10.1016/j.dsr2.2016.09.006> |
op_doi |
https://doi.org/10.1016/j.dsr2.2016.09.006 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
139 |
container_start_page |
132 |
op_container_end_page |
142 |
_version_ |
1766251515430830080 |