Strong contribution of diatom resting spores to deep-sea carbon transfer in naturally iron-fertilized waters downstream of South Georgia
International audience Biogeochemical and diatom export fluxes are presented from two bathypelagic sediment trap deployments in the Antarctic Zone of the Southern Ocean. One of the sediment traps was deployed in very productive, naturally iron-fertilized waters downstream of South Georgia (P3, 2000m...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Main Authors: | , , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2016
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Online Access: | https://hal.sorbonne-universite.fr/hal-01314534 https://hal.sorbonne-universite.fr/hal-01314534/document https://hal.sorbonne-universite.fr/hal-01314534/file/Rembauville_Strong_contribution.pdf https://doi.org/10.1016/j.dsr.2016.05.002 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
Carbon export Southern Ocean diatom resting spores natural iron fertilization [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
Carbon export Southern Ocean diatom resting spores natural iron fertilization [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Rembauville, M. Manno, C. Tarling, G.A. Blain, S. Salter, I. Strong contribution of diatom resting spores to deep-sea carbon transfer in naturally iron-fertilized waters downstream of South Georgia |
topic_facet |
Carbon export Southern Ocean diatom resting spores natural iron fertilization [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Biogeochemical and diatom export fluxes are presented from two bathypelagic sediment trap deployments in the Antarctic Zone of the Southern Ocean. One of the sediment traps was deployed in very productive, naturally iron-fertilized waters downstream of South Georgia (P3, 2000m) and compared to a deployment in moderately productive waters upstream of the island system (P2, 1500m). At both sites significant diatom export events occurred in spring (November) and contained mostly empty cells that were associated with low particulate organic carbon (POC) fluxes. A summer export pulse occurred one month later at P2 (end February/March) compared to P3 (end January). Diatom fluxes at P3 were one order of magnitude higher than at P2, a difference mainly attributed to the short and intense export of resting spores from Chaetoceros Hyalochaete and Thalassiosira antarctica species. Aside from these resting spores, diatom export assemblages at both sites were dominated by empty Fragilariopsis kerguelensis frustules. The fraction of diatoms exported as empty frustules was considerably lower at P3 (52%) than P2 (91%). This differencewas related to the flux of intact diatom resting spores at P3 and may partially explain the lower Si:C export stoichiometry observed at P3 (1.1) compared to P2 (1.5). Through the enumeration of full diatom frustules and subsequent biomass calculations we estimate that diatom resting spores account for 42 % of annual POC flux in the productive waters downstream of South Georgia. At both sites the contribution of diatom vegetative stages to POC fluxes was considerably lower (<5 %). From these analyses we conclude that resting spore export contributes towards the slightly higher bathypelagic (POC) flux at P3 (40.6 mmol m-2 y-1) compared to P2 (26.4 mmol m-2 y-1). We compared our sediment trap records with previously published diatom assemblage data from the mixed layer and surface sediments (3760 m) around South Georgia. The relative proportion of diatom resting spores ... |
author2 |
Laboratoire d'Océanographie Microbienne (LOMIC) Observatoire océanologique de Banyuls (OOB) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association |
format |
Article in Journal/Newspaper |
author |
Rembauville, M. Manno, C. Tarling, G.A. Blain, S. Salter, I. |
author_facet |
Rembauville, M. Manno, C. Tarling, G.A. Blain, S. Salter, I. |
author_sort |
Rembauville, M. |
title |
Strong contribution of diatom resting spores to deep-sea carbon transfer in naturally iron-fertilized waters downstream of South Georgia |
title_short |
Strong contribution of diatom resting spores to deep-sea carbon transfer in naturally iron-fertilized waters downstream of South Georgia |
title_full |
Strong contribution of diatom resting spores to deep-sea carbon transfer in naturally iron-fertilized waters downstream of South Georgia |
title_fullStr |
Strong contribution of diatom resting spores to deep-sea carbon transfer in naturally iron-fertilized waters downstream of South Georgia |
title_full_unstemmed |
Strong contribution of diatom resting spores to deep-sea carbon transfer in naturally iron-fertilized waters downstream of South Georgia |
title_sort |
strong contribution of diatom resting spores to deep-sea carbon transfer in naturally iron-fertilized waters downstream of south georgia |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.sorbonne-universite.fr/hal-01314534 https://hal.sorbonne-universite.fr/hal-01314534/document https://hal.sorbonne-universite.fr/hal-01314534/file/Rembauville_Strong_contribution.pdf https://doi.org/10.1016/j.dsr.2016.05.002 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_source |
ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.sorbonne-universite.fr/hal-01314534 Deep Sea Research Part I: Oceanographic Research Papers, 2016, 115, pp.22-35. ⟨10.1016/j.dsr.2016.05.002⟩ |
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op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.dsr.2016.05.002 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
115 |
container_start_page |
22 |
op_container_end_page |
35 |
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1790593071522512896 |
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ftccsdartic:oai:HAL:hal-01314534v1 2024-02-11T09:57:32+01:00 Strong contribution of diatom resting spores to deep-sea carbon transfer in naturally iron-fertilized waters downstream of South Georgia Rembauville, M. Manno, C. Tarling, G.A. Blain, S. Salter, I. Laboratoire d'Océanographie Microbienne (LOMIC) Observatoire océanologique de Banyuls (OOB) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association 2016-09 https://hal.sorbonne-universite.fr/hal-01314534 https://hal.sorbonne-universite.fr/hal-01314534/document https://hal.sorbonne-universite.fr/hal-01314534/file/Rembauville_Strong_contribution.pdf https://doi.org/10.1016/j.dsr.2016.05.002 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr.2016.05.002 hal-01314534 https://hal.sorbonne-universite.fr/hal-01314534 https://hal.sorbonne-universite.fr/hal-01314534/document https://hal.sorbonne-universite.fr/hal-01314534/file/Rembauville_Strong_contribution.pdf doi:10.1016/j.dsr.2016.05.002 info:eu-repo/semantics/OpenAccess ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.sorbonne-universite.fr/hal-01314534 Deep Sea Research Part I: Oceanographic Research Papers, 2016, 115, pp.22-35. ⟨10.1016/j.dsr.2016.05.002⟩ Carbon export Southern Ocean diatom resting spores natural iron fertilization [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2016 ftccsdartic https://doi.org/10.1016/j.dsr.2016.05.002 2024-01-21T02:03:48Z International audience Biogeochemical and diatom export fluxes are presented from two bathypelagic sediment trap deployments in the Antarctic Zone of the Southern Ocean. One of the sediment traps was deployed in very productive, naturally iron-fertilized waters downstream of South Georgia (P3, 2000m) and compared to a deployment in moderately productive waters upstream of the island system (P2, 1500m). At both sites significant diatom export events occurred in spring (November) and contained mostly empty cells that were associated with low particulate organic carbon (POC) fluxes. A summer export pulse occurred one month later at P2 (end February/March) compared to P3 (end January). Diatom fluxes at P3 were one order of magnitude higher than at P2, a difference mainly attributed to the short and intense export of resting spores from Chaetoceros Hyalochaete and Thalassiosira antarctica species. Aside from these resting spores, diatom export assemblages at both sites were dominated by empty Fragilariopsis kerguelensis frustules. The fraction of diatoms exported as empty frustules was considerably lower at P3 (52%) than P2 (91%). This differencewas related to the flux of intact diatom resting spores at P3 and may partially explain the lower Si:C export stoichiometry observed at P3 (1.1) compared to P2 (1.5). Through the enumeration of full diatom frustules and subsequent biomass calculations we estimate that diatom resting spores account for 42 % of annual POC flux in the productive waters downstream of South Georgia. At both sites the contribution of diatom vegetative stages to POC fluxes was considerably lower (<5 %). From these analyses we conclude that resting spore export contributes towards the slightly higher bathypelagic (POC) flux at P3 (40.6 mmol m-2 y-1) compared to P2 (26.4 mmol m-2 y-1). We compared our sediment trap records with previously published diatom assemblage data from the mixed layer and surface sediments (3760 m) around South Georgia. The relative proportion of diatom resting spores ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Southern Ocean The Antarctic Deep Sea Research Part I: Oceanographic Research Papers 115 22 35 |