Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Ocean

ABSTRACT: Although the Southern Ocean is considered a high-nutrient, low-chlorophyll (HNLC) area, massive and recurrent blooms are observed over and downstream of the Kerguelen Plateau. This mosaic of blooms is triggered by a higher iron supply resulting from the interaction between the Antarctic Ci...

Full description

Autores:
Flórez Leiva, Lennis Rafael
Cavagna, Anne Julie
Fripiat, François
Elskens, Marc
Mangion, Perrine
Queguiner, Bernard
Tipo de recurso:
Article of investigation
Fecha de publicación:
2015
Institución:
Universidad de Antioquia
Repositorio:
Repositorio UdeA
Idioma:
eng
OAI Identifier:
oai:bibliotecadigital.udea.edu.co:10495/21628
Acceso en línea:
http://hdl.handle.net/10495/21628
Palabra clave:
islas Kerguelen
Kerguelen Island
Nitrificación
Nitrification
Océano antártico
Antarctic Ocean
http://aims.fao.org/aos/agrovoc/c_12834
http://aims.fao.org/aos/agrovoc/c_468
Rights
openAccess
License
http://creativecommons.org/licenses/by/2.5/co/
id UDEA2_c7d5798045ef25f83b77a43f6a365b7b
oai_identifier_str oai:bibliotecadigital.udea.edu.co:10495/21628
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network_name_str Repositorio UdeA
repository_id_str
dc.title.spa.fl_str_mv Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Ocean
title Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Ocean
spellingShingle Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Ocean
islas Kerguelen
Kerguelen Island
Nitrificación
Nitrification
Océano antártico
Antarctic Ocean
http://aims.fao.org/aos/agrovoc/c_12834
http://aims.fao.org/aos/agrovoc/c_468
title_short Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Ocean
title_full Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Ocean
title_fullStr Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Ocean
title_full_unstemmed Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Ocean
title_sort Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Ocean
dc.creator.fl_str_mv Flórez Leiva, Lennis Rafael
Cavagna, Anne Julie
Fripiat, François
Elskens, Marc
Mangion, Perrine
Queguiner, Bernard
dc.contributor.author.none.fl_str_mv Flórez Leiva, Lennis Rafael
Cavagna, Anne Julie
Fripiat, François
Elskens, Marc
Mangion, Perrine
Queguiner, Bernard
dc.subject.lemb.none.fl_str_mv islas Kerguelen
Kerguelen Island
topic islas Kerguelen
Kerguelen Island
Nitrificación
Nitrification
Océano antártico
Antarctic Ocean
http://aims.fao.org/aos/agrovoc/c_12834
http://aims.fao.org/aos/agrovoc/c_468
dc.subject.agrovoc.none.fl_str_mv Nitrificación
Nitrification
Océano antártico
Antarctic Ocean
dc.subject.agrovocuri.none.fl_str_mv http://aims.fao.org/aos/agrovoc/c_12834
http://aims.fao.org/aos/agrovoc/c_468
description ABSTRACT: Although the Southern Ocean is considered a high-nutrient, low-chlorophyll (HNLC) area, massive and recurrent blooms are observed over and downstream of the Kerguelen Plateau. This mosaic of blooms is triggered by a higher iron supply resulting from the interaction between the Antarctic Circumpolar Current and the local bathymetry. Net primary production, N uptake (NO−3 and NH+4), and nitrification rates were measured at eight stations in austral spring 2011 (October–November) during the KEOPS 2 cruise in the Kerguelen Plateau area. Natural iron fertilization stimulated primary production, with mixed layer integrated net primary production and growth rates much higher in the fertilized areas (up to 315 mmol C m−2 d−1 and up to 0.31 d−1 respectively) compared to the HNLC reference site (12 mmol C m−2 d−1 and 0.06 d−1 respectively). Primary production was mainly sustained by nitrate uptake, with f ratios (corresponding to NO−3-uptake / (NO−3-uptake + NH+4-uptake)) lying at the upper end of the observations for the Southern Ocean (up to 0.9). We report high rates of nitrification (up to ∼ 3 μmol N L−1 d −1, with ∼ 90 % of them < 1 μmol N L−1 d−1) typically occurring below the euphotic zone, as classically observed in the global ocean. The specificity of the studied area is that at most of the stations, the euphotic layer was shallower than the mixed layer, implying that nitrifiers can efficiently compete with phytoplankton for the ammonium produced by remineralization at low-light intensities. Nitrate produced by nitrification in the mixed layer below the euphotic zone is easily supplied to the euphotic zone waters above, and nitrification sustained 70 ± 30 % of the nitrate uptake in the productive area above the Kerguelen Plateau. This complicates estimations of new production as potentially exportable production. We conclude that high productivity in deep mixing system stimulates the N cycle by increasing both assimilation and regeneration.
publishDate 2015
dc.date.issued.none.fl_str_mv 2015
dc.date.accessioned.none.fl_str_mv 2021-08-09T23:58:18Z
dc.date.available.none.fl_str_mv 2021-08-09T23:58:18Z
dc.type.spa.fl_str_mv info:eu-repo/semantics/article
dc.type.coarversion.fl_str_mv http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.hasversion.spa.fl_str_mv info:eu-repo/semantics/publishedVersion
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dc.identifier.citation.spa.fl_str_mv Cavagna, A. J., Fripiat, F., Elskens, M., Mangion, P., Chirurgien, L., Closset, I., Lasbleiz, M., Florez-Leiva, L., Cardinal, D., Leblanc, K., Fernandez, C., Lefèvre, D., Oriol, L., Blain, S., Quéguiner, B., and Dehairs, F.: Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Ocean, Biogeosciences, 12, 6515–6528, https://doi.org/10.5194/bg-12-6515-2015
dc.identifier.issn.none.fl_str_mv 1726-4170
dc.identifier.uri.none.fl_str_mv http://hdl.handle.net/10495/21628
dc.identifier.doi.none.fl_str_mv 10.5194/bg-12-6515-2015
dc.identifier.eissn.none.fl_str_mv 1726-4189
identifier_str_mv Cavagna, A. J., Fripiat, F., Elskens, M., Mangion, P., Chirurgien, L., Closset, I., Lasbleiz, M., Florez-Leiva, L., Cardinal, D., Leblanc, K., Fernandez, C., Lefèvre, D., Oriol, L., Blain, S., Quéguiner, B., and Dehairs, F.: Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Ocean, Biogeosciences, 12, 6515–6528, https://doi.org/10.5194/bg-12-6515-2015
1726-4170
10.5194/bg-12-6515-2015
1726-4189
url http://hdl.handle.net/10495/21628
dc.language.iso.spa.fl_str_mv eng
language eng
dc.relation.ispartofjournalabbrev.spa.fl_str_mv Biogeosciences
dc.rights.spa.fl_str_mv info:eu-repo/semantics/openAccess
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eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/2.5/co/
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dc.format.extent.spa.fl_str_mv 14
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dc.publisher.spa.fl_str_mv European Geosciences Union
dc.publisher.group.spa.fl_str_mv Grupo de Investigación Océanos Clima y Ambiente - OCA
dc.publisher.place.spa.fl_str_mv Katlenberg-Lindau, Alemania
institution Universidad de Antioquia
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spelling Flórez Leiva, Lennis RafaelCavagna, Anne JulieFripiat, FrançoisElskens, MarcMangion, PerrineQueguiner, Bernard2021-08-09T23:58:18Z2021-08-09T23:58:18Z2015Cavagna, A. J., Fripiat, F., Elskens, M., Mangion, P., Chirurgien, L., Closset, I., Lasbleiz, M., Florez-Leiva, L., Cardinal, D., Leblanc, K., Fernandez, C., Lefèvre, D., Oriol, L., Blain, S., Quéguiner, B., and Dehairs, F.: Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Ocean, Biogeosciences, 12, 6515–6528, https://doi.org/10.5194/bg-12-6515-20151726-4170http://hdl.handle.net/10495/2162810.5194/bg-12-6515-20151726-4189ABSTRACT: Although the Southern Ocean is considered a high-nutrient, low-chlorophyll (HNLC) area, massive and recurrent blooms are observed over and downstream of the Kerguelen Plateau. This mosaic of blooms is triggered by a higher iron supply resulting from the interaction between the Antarctic Circumpolar Current and the local bathymetry. Net primary production, N uptake (NO−3 and NH+4), and nitrification rates were measured at eight stations in austral spring 2011 (October–November) during the KEOPS 2 cruise in the Kerguelen Plateau area. Natural iron fertilization stimulated primary production, with mixed layer integrated net primary production and growth rates much higher in the fertilized areas (up to 315 mmol C m−2 d−1 and up to 0.31 d−1 respectively) compared to the HNLC reference site (12 mmol C m−2 d−1 and 0.06 d−1 respectively). Primary production was mainly sustained by nitrate uptake, with f ratios (corresponding to NO−3-uptake / (NO−3-uptake + NH+4-uptake)) lying at the upper end of the observations for the Southern Ocean (up to 0.9). We report high rates of nitrification (up to ∼ 3 μmol N L−1 d −1, with ∼ 90 % of them < 1 μmol N L−1 d−1) typically occurring below the euphotic zone, as classically observed in the global ocean. The specificity of the studied area is that at most of the stations, the euphotic layer was shallower than the mixed layer, implying that nitrifiers can efficiently compete with phytoplankton for the ammonium produced by remineralization at low-light intensities. Nitrate produced by nitrification in the mixed layer below the euphotic zone is easily supplied to the euphotic zone waters above, and nitrification sustained 70 ± 30 % of the nitrate uptake in the productive area above the Kerguelen Plateau. This complicates estimations of new production as potentially exportable production. We conclude that high productivity in deep mixing system stimulates the N cycle by increasing both assimilation and regeneration.COL016957814application/pdfengEuropean Geosciences UnionGrupo de Investigación Océanos Clima y Ambiente - OCAKatlenberg-Lindau, Alemaniainfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_2df8fbb1https://purl.org/redcol/resource_type/ARTArtículo de investigaciónhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/2.5/co/http://purl.org/coar/access_right/c_abf2https://creativecommons.org/licenses/by/4.0/Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Oceanislas KerguelenKerguelen IslandNitrificaciónNitrificationOcéano antárticoAntarctic Oceanhttp://aims.fao.org/aos/agrovoc/c_12834http://aims.fao.org/aos/agrovoc/c_468BiogeosciencesBiogeosciences1141221ORIGINALFlorez-Leiva_2015_ProductionRegimeAssociated.pdfFlorez-Leiva_2015_ProductionRegimeAssociated.pdfArtículo de investigaciónapplication/pdf934098http://bibliotecadigital.udea.edu.co/bitstream/10495/21628/1/Florez-Leiva_2015_ProductionRegimeAssociated.pdf975c23c8dfcdfea5df9c0f9a791b2565MD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8927http://bibliotecadigital.udea.edu.co/bitstream/10495/21628/2/license_rdf1646d1f6b96dbbbc38035efc9239ac9cMD52LICENSElicense.txtlicense.txttext/plain; charset=utf-81748http://bibliotecadigital.udea.edu.co/bitstream/10495/21628/3/license.txt8a4605be74aa9ea9d79846c1fba20a33MD5310495/21628oai:bibliotecadigital.udea.edu.co:10495/216282021-08-09 18:58:18.762Repositorio Institucional Universidad de Antioquiaandres.perez@udea.edu.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