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...

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Published in:Deep Sea Research Part II: Topical Studies in Oceanography
Main Authors: Annett, Amber L., Henley, Sian F., Venables, Hugh J., Meredith, Michael P., Clarke, Andrew, Ganeshram, Raja S.
Format: Article in Journal/Newspaper
Language:English
Published: 2017
Subjects:
Online Access:https://eprints.soton.ac.uk/418526/
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spelling ftsouthampton:oai:eprints.soton.ac.uk:418526 2023-07-30T03:58:20+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. 2017-05-01 https://eprints.soton.ac.uk/418526/ English eng Annett, Amber L., Henley, Sian F., Venables, Hugh J., Meredith, Michael P., Clarke, Andrew and Ganeshram, Raja S. (2017) Silica cycling and isotopic composition in northern Marguerite Bay on the rapidly-warming western Antarctic Peninsula. Deep-Sea Research Part II: Topical Studies in Oceanography, 139, 132-142. (doi:10.1016/j.dsr2.2016.09.006 <http://dx.doi.org/10.1016/j.dsr2.2016.09.006>). Article PeerReviewed 2017 ftsouthampton https://doi.org/10.1016/j.dsr2.2016.09.006 2023-07-09T22:21:00Z 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 University of Southampton: e-Prints Soton Antarctic Antarctic Peninsula Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) Southern Ocean Deep Sea Research Part II: Topical Studies in Oceanography 139 132 142
institution Open Polar
collection University of Southampton: e-Prints Soton
op_collection_id ftsouthampton
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
publishDate 2017
url https://eprints.soton.ac.uk/418526/
long_lat ENVELOPE(141.378,141.378,-66.787,-66.787)
ENVELOPE(-68.000,-68.000,-68.500,-68.500)
geographic Antarctic
Antarctic Peninsula
Marguerite
Marguerite Bay
Southern Ocean
geographic_facet Antarctic
Antarctic Peninsula
Marguerite
Marguerite Bay
Southern Ocean
genre Antarc*
Antarctic
Antarctic Peninsula
Southern Ocean
genre_facet Antarc*
Antarctic
Antarctic Peninsula
Southern Ocean
op_relation Annett, Amber L., Henley, Sian F., Venables, Hugh J., Meredith, Michael P., Clarke, Andrew and Ganeshram, Raja S. (2017) Silica cycling and isotopic composition in northern Marguerite Bay on the rapidly-warming western Antarctic Peninsula. Deep-Sea Research Part II: Topical Studies in Oceanography, 139, 132-142. (doi:10.1016/j.dsr2.2016.09.006 <http://dx.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
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