Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E
The vertical distribution of 234Th was measured along the 10°E meridian between 44°S and 53°S in the Antarctic Circumpolar Current (ACC) during the austral summer of 2012. The overarching goal of this work was to estimate particulate organic carbon (POC) export across three fronts: the Sub-Antarctic...
| Autores: | , , , , , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2017 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:323466 |
| Acceso en línea: | https://ddd.uab.cat/record/323466 https://dx.doi.org/urn:doi:10.1016/j.dsr2.2016.05.016 |
| Access Level: | acceso abierto |
| Palabra clave: | Antarctic Circumpolar Current Export efficiency Particulate organic carbon export Plankton community Polar Front Southern Ocean Thorium Transfer efficiency |
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Particulate organic carbon export across the Antarctic Circumpolar Current at 10°EDifferences between north and south of the Antarctic Polar FrontPuigcorbé, Viena|||0000-0001-5892-2305Roca-Martí, Montserrat|||0000-0002-4719-9358Masqué Barri, Pere|||0000-0002-1789-320XBenitez-Nelson, Claudia|||0000-0002-1004-5048Rutgers v. d. Loeff, MichielLaglera, Luis MiguelBracher, Astrid|||0000-0003-3025-5517Cheah, Wee|||0000-0002-1824-0577Strass, Volker H.Hoppema, MarioSantos-Echeandía, JuanHunt, Brian P.V.Pakhomov, Evgeny A.Klaas, Christine|||0000-0002-6679-8970Antarctic Circumpolar CurrentExport efficiencyParticulate organic carbon exportPlankton communityPolar FrontSouthern OceanThoriumTransfer efficiencyThe vertical distribution of 234Th was measured along the 10°E meridian between 44°S and 53°S in the Antarctic Circumpolar Current (ACC) during the austral summer of 2012. The overarching goal of this work was to estimate particulate organic carbon (POC) export across three fronts: the Sub-Antarctic Front (SAF), the Antarctic Polar Front (APF) and the Southern Polar Front (SPF). Steady state export fluxes of 234Th in the upper 100 m ranged from 1600 to 2600 dpm m-2 d-1, decreasing with increasing latitude. Using large particle (>53 μm) C/234Th ratios, the 234Th-derived POC fluxes at 100 m ranged from 25 to 41 mmol C m-2 d-1. Observed C/234Th ratios decreased with increasing depth north of the APF while south of the APF, ratios remained similar or even increased with depth. These changes in C/234Th ratios are likely due to differences in the food web. Indeed, satellite images, together with macronutrients and dissolved iron concentrations suggest two different planktonic community structures north and south of the APF. Our results indicate that higher ratios of POC flux at 100 m to primary production occurred in nanophytoplankton dominated surface waters, where primary production rates were lower. Satellite images prior to the expedition suggest that the higher export efficiencies obtained in the northern half of the transect may be the result of the decoupling between production and export (Buesseler 1998). Transfer efficiencies to 400 m, i.e. the fraction of exported POC that reached 400 m, were found to be higher south of the APF, where diatoms were dominant and salps largely abundant. This suggests different remineralization pathways of sinking particles, influencing the transfer efficiency of exported POC to depth. 22017-01-0120172017-01-01Articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/323466https://dx.doi.org/urn:doi:10.1016/j.dsr2.2016.05.016reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengMinisterio de Ciencia e Innovación https://doi.org/10.13039/501100004837 CTM2011-14027-EGeneralitat de Catalunya https://doi.org/10.13039/501100002809 2014/SGR-1365Ministerio de Educación, Cultura y Deporte https://doi.org/10.13039/501100003176 AP2009-4733Ministerio de Educación, Cultura y Deporte https://doi.org/10.13039/501100003176 AP2010-2510Ministerio de Ciencia e Innovación https://doi.org/10.13039/501100004837 CGL2010-11846-Eopen accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.https://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:3234662026-06-06T12:50:31Z |
| dc.title.none.fl_str_mv |
Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E Differences between north and south of the Antarctic Polar Front |
| title |
Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E |
| spellingShingle |
Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E Puigcorbé, Viena|||0000-0001-5892-2305 Antarctic Circumpolar Current Export efficiency Particulate organic carbon export Plankton community Polar Front Southern Ocean Thorium Transfer efficiency |
| title_short |
Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E |
| title_full |
Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E |
| title_fullStr |
Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E |
| title_full_unstemmed |
Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E |
| title_sort |
Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E |
| dc.creator.none.fl_str_mv |
Puigcorbé, Viena|||0000-0001-5892-2305 Roca-Martí, Montserrat|||0000-0002-4719-9358 Masqué Barri, Pere|||0000-0002-1789-320X Benitez-Nelson, Claudia|||0000-0002-1004-5048 Rutgers v. d. Loeff, Michiel Laglera, Luis Miguel Bracher, Astrid|||0000-0003-3025-5517 Cheah, Wee|||0000-0002-1824-0577 Strass, Volker H. Hoppema, Mario Santos-Echeandía, Juan Hunt, Brian P.V. Pakhomov, Evgeny A. Klaas, Christine|||0000-0002-6679-8970 |
| author |
Puigcorbé, Viena|||0000-0001-5892-2305 |
| author_facet |
Puigcorbé, Viena|||0000-0001-5892-2305 Roca-Martí, Montserrat|||0000-0002-4719-9358 Masqué Barri, Pere|||0000-0002-1789-320X Benitez-Nelson, Claudia|||0000-0002-1004-5048 Rutgers v. d. Loeff, Michiel Laglera, Luis Miguel Bracher, Astrid|||0000-0003-3025-5517 Cheah, Wee|||0000-0002-1824-0577 Strass, Volker H. Hoppema, Mario Santos-Echeandía, Juan Hunt, Brian P.V. Pakhomov, Evgeny A. Klaas, Christine|||0000-0002-6679-8970 |
| author_role |
author |
| author2 |
Roca-Martí, Montserrat|||0000-0002-4719-9358 Masqué Barri, Pere|||0000-0002-1789-320X Benitez-Nelson, Claudia|||0000-0002-1004-5048 Rutgers v. d. Loeff, Michiel Laglera, Luis Miguel Bracher, Astrid|||0000-0003-3025-5517 Cheah, Wee|||0000-0002-1824-0577 Strass, Volker H. Hoppema, Mario Santos-Echeandía, Juan Hunt, Brian P.V. Pakhomov, Evgeny A. Klaas, Christine|||0000-0002-6679-8970 |
| author2_role |
author author author author author author author author author author author author author |
| dc.subject.none.fl_str_mv |
Antarctic Circumpolar Current Export efficiency Particulate organic carbon export Plankton community Polar Front Southern Ocean Thorium Transfer efficiency |
| topic |
Antarctic Circumpolar Current Export efficiency Particulate organic carbon export Plankton community Polar Front Southern Ocean Thorium Transfer efficiency |
| description |
The vertical distribution of 234Th was measured along the 10°E meridian between 44°S and 53°S in the Antarctic Circumpolar Current (ACC) during the austral summer of 2012. The overarching goal of this work was to estimate particulate organic carbon (POC) export across three fronts: the Sub-Antarctic Front (SAF), the Antarctic Polar Front (APF) and the Southern Polar Front (SPF). Steady state export fluxes of 234Th in the upper 100 m ranged from 1600 to 2600 dpm m-2 d-1, decreasing with increasing latitude. Using large particle (>53 μm) C/234Th ratios, the 234Th-derived POC fluxes at 100 m ranged from 25 to 41 mmol C m-2 d-1. Observed C/234Th ratios decreased with increasing depth north of the APF while south of the APF, ratios remained similar or even increased with depth. These changes in C/234Th ratios are likely due to differences in the food web. Indeed, satellite images, together with macronutrients and dissolved iron concentrations suggest two different planktonic community structures north and south of the APF. Our results indicate that higher ratios of POC flux at 100 m to primary production occurred in nanophytoplankton dominated surface waters, where primary production rates were lower. Satellite images prior to the expedition suggest that the higher export efficiencies obtained in the northern half of the transect may be the result of the decoupling between production and export (Buesseler 1998). Transfer efficiencies to 400 m, i.e. the fraction of exported POC that reached 400 m, were found to be higher south of the APF, where diatoms were dominant and salps largely abundant. This suggests different remineralization pathways of sinking particles, influencing the transfer efficiency of exported POC to depth. |
| publishDate |
2017 |
| dc.date.none.fl_str_mv |
2 2017-01-01 2017 2017-01-01 |
| dc.type.none.fl_str_mv |
Article http://purl.org/coar/resource_type/c_6501 AM http://purl.org/coar/version/c_ab4af688f83e57aa |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
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article |
| dc.identifier.none.fl_str_mv |
https://ddd.uab.cat/record/323466 https://dx.doi.org/urn:doi:10.1016/j.dsr2.2016.05.016 |
| url |
https://ddd.uab.cat/record/323466 https://dx.doi.org/urn:doi:10.1016/j.dsr2.2016.05.016 |
| dc.language.none.fl_str_mv |
Inglés eng |
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Inglés |
| language |
eng |
| dc.relation.none.fl_str_mv |
Ministerio de Ciencia e Innovación https://doi.org/10.13039/501100004837 CTM2011-14027-E Generalitat de Catalunya https://doi.org/10.13039/501100002809 2014/SGR-1365 Ministerio de Educación, Cultura y Deporte https://doi.org/10.13039/501100003176 AP2009-4733 Ministerio de Educación, Cultura y Deporte https://doi.org/10.13039/501100003176 AP2010-2510 Ministerio de Ciencia e Innovación https://doi.org/10.13039/501100004837 CGL2010-11846-E |
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open access http://purl.org/coar/access_right/c_abf2 https://creativecommons.org/licenses/by-nc-nd/4.0/ |
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info:eu-repo/semantics/openAccess |
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open access http://purl.org/coar/access_right/c_abf2 https://creativecommons.org/licenses/by-nc-nd/4.0/ |
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openAccess |
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application/pdf |
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reponame:Dipòsit Digital de Documents de la UAB instname:Universitat Autònoma de Barcelona |
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