Distribution and export of particulate organic carbon in East Antarctic coastal polynyas
14 pages, 11 figures, 2 tables, supplementary data https://doi.org/10.1016/j.dsr.2022.103899.-- Data availability: Data presented in this study can be sourced from https://metadata.imas.utas.edu.au/geonetwork/srv/eng/metadata.show?uuid=02364e10-ebc0-463a-b690-2c4ed643733c Polynyas represent regions...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Online Access: | http://hdl.handle.net/10261/285719 https://doi.org/10.1016/j.dsr.2022.103899 https://doi.org/10.13039/501100011033 https://doi.org/10.13039/501100001798 https://doi.org/10.13039/501100000923 https://doi.org/10.13039/501100000780 |
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ftcsic:oai:digital.csic.es:10261/285719 2024-02-11T09:55:50+01:00 Distribution and export of particulate organic carbon in East Antarctic coastal polynyas Ratnarajah, Lavenia Puigcorbé, Viena Moreau, Sebastien Roca-Martí, Montserrat Janssens, Julie Corkill, Matthew Duprat, Luis Genovese, Cristina Lieser, Jan Masqué, Pere Lannuzel, Delphine Australian Government University of Tasmania Australian Research Council Edith Cowan University Fundación "la Caixa" European Commission Woods Hole Oceanographic Institution Ocean Frontier Institute Agencia Estatal de Investigación (España) 2022-12 http://hdl.handle.net/10261/285719 https://doi.org/10.1016/j.dsr.2022.103899 https://doi.org/10.13039/501100011033 https://doi.org/10.13039/501100001798 https://doi.org/10.13039/501100000923 https://doi.org/10.13039/501100000780 en eng Elsevier #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/EC/H2020/847648 Publisher's version https://doi.org/10.1016/j.dsr.2022.103899 Sí Deep Sea Research - Part I - Oceanographic Research Papers 190: 103899 (2022) 0967-0637 CEX2019-000928-S http://hdl.handle.net/10261/285719 doi:10.1016/j.dsr.2022.103899 http://dx.doi.org/10.13039/501100011033 http://dx.doi.org/10.13039/501100001798 http://dx.doi.org/10.13039/501100000923 http://dx.doi.org/10.13039/501100000780 open Particulate organic carbon POC export 234Th Polynya Southern ocean East Antarctica artículo 2022 ftcsic https://doi.org/10.1016/j.dsr.2022.10389910.13039/50110001103310.13039/50110000179810.13039/50110000092310.13039/501100000780 2024-01-16T11:32:30Z 14 pages, 11 figures, 2 tables, supplementary data https://doi.org/10.1016/j.dsr.2022.103899.-- Data availability: Data presented in this study can be sourced from https://metadata.imas.utas.edu.au/geonetwork/srv/eng/metadata.show?uuid=02364e10-ebc0-463a-b690-2c4ed643733c Polynyas represent regions of enhanced primary production because of the low, or absent, sea-ice cover coupled with the proximity of nutrient sources. However, studies throughout the Southern Ocean suggest elevated primary production does not necessarily result in increased carbon export. Three coastal polynyas in East Antarctica and an off-shelf region were visited during the austral summer from December 2016 to January 2017 to examine the vertical distribution and concentration of particulate organic carbon (POC). Carbon export was also examined using thorium-234 (234Th) as a proxy at two of the polynyas. Our results show that concentrations and integrated POC stocks were higher within the polynyas compared to the off-shelf sites. Within the polynyas, vertical POC concentrations were higher in the Mertz and Ninnis polynyas compared to the Dalton polynya. Similarly, higher carbon export was measured in the diatom-dominated Mertz polynya, where large particles (>53 μm) represented a significant fraction of the particulate 234Th and POC (average 50% and 39%, respectively), compared to the small flagellate-dominated Dalton polynya, where almost all the particulate 234Th and POC were found in the smaller size fraction (1–53 μm). The POC to Chlorophyll-a ratios suggest that organic matter below the mixed layer in the polynyas consisted largely of fresh phytoplankton at this time of the year. In combination with a parallel study on phytoplankton production at these sites, we find that increased primary production at these polynyas does lead to greater concentrations and export of POC and a higher POC export efficiency This study was supported by the Australian Government's Cooperative Research Centres through the Antarctic Climate and ... Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean Digital.CSIC (Spanish National Research Council) Antarctic Southern Ocean The Antarctic East Antarctica Austral Deep Sea Research Part I: Oceanographic Research Papers 190 103899 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Particulate organic carbon POC export 234Th Polynya Southern ocean East Antarctica |
spellingShingle |
Particulate organic carbon POC export 234Th Polynya Southern ocean East Antarctica Ratnarajah, Lavenia Puigcorbé, Viena Moreau, Sebastien Roca-Martí, Montserrat Janssens, Julie Corkill, Matthew Duprat, Luis Genovese, Cristina Lieser, Jan Masqué, Pere Lannuzel, Delphine Distribution and export of particulate organic carbon in East Antarctic coastal polynyas |
topic_facet |
Particulate organic carbon POC export 234Th Polynya Southern ocean East Antarctica |
description |
14 pages, 11 figures, 2 tables, supplementary data https://doi.org/10.1016/j.dsr.2022.103899.-- Data availability: Data presented in this study can be sourced from https://metadata.imas.utas.edu.au/geonetwork/srv/eng/metadata.show?uuid=02364e10-ebc0-463a-b690-2c4ed643733c Polynyas represent regions of enhanced primary production because of the low, or absent, sea-ice cover coupled with the proximity of nutrient sources. However, studies throughout the Southern Ocean suggest elevated primary production does not necessarily result in increased carbon export. Three coastal polynyas in East Antarctica and an off-shelf region were visited during the austral summer from December 2016 to January 2017 to examine the vertical distribution and concentration of particulate organic carbon (POC). Carbon export was also examined using thorium-234 (234Th) as a proxy at two of the polynyas. Our results show that concentrations and integrated POC stocks were higher within the polynyas compared to the off-shelf sites. Within the polynyas, vertical POC concentrations were higher in the Mertz and Ninnis polynyas compared to the Dalton polynya. Similarly, higher carbon export was measured in the diatom-dominated Mertz polynya, where large particles (>53 μm) represented a significant fraction of the particulate 234Th and POC (average 50% and 39%, respectively), compared to the small flagellate-dominated Dalton polynya, where almost all the particulate 234Th and POC were found in the smaller size fraction (1–53 μm). The POC to Chlorophyll-a ratios suggest that organic matter below the mixed layer in the polynyas consisted largely of fresh phytoplankton at this time of the year. In combination with a parallel study on phytoplankton production at these sites, we find that increased primary production at these polynyas does lead to greater concentrations and export of POC and a higher POC export efficiency This study was supported by the Australian Government's Cooperative Research Centres through the Antarctic Climate and ... |
author2 |
Australian Government University of Tasmania Australian Research Council Edith Cowan University Fundación "la Caixa" European Commission Woods Hole Oceanographic Institution Ocean Frontier Institute Agencia Estatal de Investigación (España) |
format |
Article in Journal/Newspaper |
author |
Ratnarajah, Lavenia Puigcorbé, Viena Moreau, Sebastien Roca-Martí, Montserrat Janssens, Julie Corkill, Matthew Duprat, Luis Genovese, Cristina Lieser, Jan Masqué, Pere Lannuzel, Delphine |
author_facet |
Ratnarajah, Lavenia Puigcorbé, Viena Moreau, Sebastien Roca-Martí, Montserrat Janssens, Julie Corkill, Matthew Duprat, Luis Genovese, Cristina Lieser, Jan Masqué, Pere Lannuzel, Delphine |
author_sort |
Ratnarajah, Lavenia |
title |
Distribution and export of particulate organic carbon in East Antarctic coastal polynyas |
title_short |
Distribution and export of particulate organic carbon in East Antarctic coastal polynyas |
title_full |
Distribution and export of particulate organic carbon in East Antarctic coastal polynyas |
title_fullStr |
Distribution and export of particulate organic carbon in East Antarctic coastal polynyas |
title_full_unstemmed |
Distribution and export of particulate organic carbon in East Antarctic coastal polynyas |
title_sort |
distribution and export of particulate organic carbon in east antarctic coastal polynyas |
publisher |
Elsevier |
publishDate |
2022 |
url |
http://hdl.handle.net/10261/285719 https://doi.org/10.1016/j.dsr.2022.103899 https://doi.org/10.13039/501100011033 https://doi.org/10.13039/501100001798 https://doi.org/10.13039/501100000923 https://doi.org/10.13039/501100000780 |
geographic |
Antarctic Southern Ocean The Antarctic East Antarctica Austral |
geographic_facet |
Antarctic Southern Ocean The Antarctic East Antarctica Austral |
genre |
Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean |
op_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/EC/H2020/847648 Publisher's version https://doi.org/10.1016/j.dsr.2022.103899 Sí Deep Sea Research - Part I - Oceanographic Research Papers 190: 103899 (2022) 0967-0637 CEX2019-000928-S http://hdl.handle.net/10261/285719 doi:10.1016/j.dsr.2022.103899 http://dx.doi.org/10.13039/501100011033 http://dx.doi.org/10.13039/501100001798 http://dx.doi.org/10.13039/501100000923 http://dx.doi.org/10.13039/501100000780 |
op_rights |
open |
op_doi |
https://doi.org/10.1016/j.dsr.2022.10389910.13039/50110001103310.13039/50110000179810.13039/50110000092310.13039/501100000780 |
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Deep Sea Research Part I: Oceanographic Research Papers |
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190 |
container_start_page |
103899 |
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