Particulate biogenic silica and carbon production rates and particulate matter distribution in the Indian sector of the Subantarctic Ocean
International audience The silicon and carbon cycles in the Subantarctic region have been investigated in the summer 1999 during the Antares 4 cruise in the Indian sector of the Southern Ocean. Both biogenic silica (BSi) biomass and production values were low and indicative of the end of the product...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Online Access: | https://hal.science/hal-00700118 https://doi.org/10.1016/S0967-0645(02)00078-4 |
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ftinsu:oai:HAL:hal-00700118v1 2023-11-12T04:26:42+01:00 Particulate biogenic silica and carbon production rates and particulate matter distribution in the Indian sector of the Subantarctic Ocean Leblanc, Karine Queguiner, Bernard Fiala, Michel Blain, Stéphane Morvan, J. Laboratoire d'océanographie et de biogéochimie (LOB) Université de la Méditerranée - Aix-Marseille 2-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Université Pierre et Marie Curie - Paris 6 (UPMC) Université de Brest (UBO) Ecole Nationale Supérieure de Chimie de Rennes (ENSCR) 2002-03-21 https://hal.science/hal-00700118 https://doi.org/10.1016/S0967-0645(02)00078-4 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/S0967-0645(02)00078-4 hal-00700118 https://hal.science/hal-00700118 doi:10.1016/S0967-0645(02)00078-4 ISSN: 0967-0645 Deep Sea Research Part II: Topical Studies in Oceanography https://hal.science/hal-00700118 Deep Sea Research Part II: Topical Studies in Oceanography, 2002, 49 (16), pp.3189-3206. ⟨10.1016/S0967-0645(02)00078-4⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2002 ftinsu https://doi.org/10.1016/S0967-0645(02)00078-4 2023-11-01T17:22:28Z International audience The silicon and carbon cycles in the Subantarctic region have been investigated in the summer 1999 during the Antares 4 cruise in the Indian sector of the Southern Ocean. Both biogenic silica (BSi) biomass and production values were low and indicative of the end of the productive period. Biogeochemical parameters revealed that the siliceous components of the phytoplankton were scarce. The study area was characterized by nanoplanktonic communities. Depth-integrated values of BSi showed a north-south positive gradient: average values were 45.65 mmol m−2 in the Polar Frontal Zone (PFZ) and 19.82 mmol m−2 in the Subtropical Zone (STZ). Diatom frustules appeared slightly deteriorated, and BSi distribution suggested particulate matter sedimentation especially at the southern boundary of the study area, where the highest concentrations were found (750 nmol l−1). BSi tended to accumulate along the Subtropical Front, with values reaching up to 420 nmol l−1. Depth-integrated BSi production rates showed an inverse pattern compared to BSi: the maximum and the minimum values were found, respectively, in the STZ (0.72 mmol Si m−2d−1) and in the PFZ (0.25 mmol Si m−2 d−1). The Subantarctic region, located between the PFZ and the STZ, showed intermediate values for both BSi standing stock (31.58 mmol m−2) and production rates (0.50 mmol Si m−2 d−1). A production regime based on orthosilicic acid regeneration is hypothesized in the STZ where surface temperatures appear high enough to sustain higher BSi dissolution rates. During summer, BSi production in the frontal zone of the Indian sector is comparable to the lowest production rates of oligotrophic waters. Article in Journal/Newspaper Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Indian Southern Ocean Deep Sea Research Part II: Topical Studies in Oceanography 49 16 3189 3206 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Leblanc, Karine Queguiner, Bernard Fiala, Michel Blain, Stéphane Morvan, J. Particulate biogenic silica and carbon production rates and particulate matter distribution in the Indian sector of the Subantarctic Ocean |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience The silicon and carbon cycles in the Subantarctic region have been investigated in the summer 1999 during the Antares 4 cruise in the Indian sector of the Southern Ocean. Both biogenic silica (BSi) biomass and production values were low and indicative of the end of the productive period. Biogeochemical parameters revealed that the siliceous components of the phytoplankton were scarce. The study area was characterized by nanoplanktonic communities. Depth-integrated values of BSi showed a north-south positive gradient: average values were 45.65 mmol m−2 in the Polar Frontal Zone (PFZ) and 19.82 mmol m−2 in the Subtropical Zone (STZ). Diatom frustules appeared slightly deteriorated, and BSi distribution suggested particulate matter sedimentation especially at the southern boundary of the study area, where the highest concentrations were found (750 nmol l−1). BSi tended to accumulate along the Subtropical Front, with values reaching up to 420 nmol l−1. Depth-integrated BSi production rates showed an inverse pattern compared to BSi: the maximum and the minimum values were found, respectively, in the STZ (0.72 mmol Si m−2d−1) and in the PFZ (0.25 mmol Si m−2 d−1). The Subantarctic region, located between the PFZ and the STZ, showed intermediate values for both BSi standing stock (31.58 mmol m−2) and production rates (0.50 mmol Si m−2 d−1). A production regime based on orthosilicic acid regeneration is hypothesized in the STZ where surface temperatures appear high enough to sustain higher BSi dissolution rates. During summer, BSi production in the frontal zone of the Indian sector is comparable to the lowest production rates of oligotrophic waters. |
author2 |
Laboratoire d'océanographie et de biogéochimie (LOB) Université de la Méditerranée - Aix-Marseille 2-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Université Pierre et Marie Curie - Paris 6 (UPMC) Université de Brest (UBO) Ecole Nationale Supérieure de Chimie de Rennes (ENSCR) |
format |
Article in Journal/Newspaper |
author |
Leblanc, Karine Queguiner, Bernard Fiala, Michel Blain, Stéphane Morvan, J. |
author_facet |
Leblanc, Karine Queguiner, Bernard Fiala, Michel Blain, Stéphane Morvan, J. |
author_sort |
Leblanc, Karine |
title |
Particulate biogenic silica and carbon production rates and particulate matter distribution in the Indian sector of the Subantarctic Ocean |
title_short |
Particulate biogenic silica and carbon production rates and particulate matter distribution in the Indian sector of the Subantarctic Ocean |
title_full |
Particulate biogenic silica and carbon production rates and particulate matter distribution in the Indian sector of the Subantarctic Ocean |
title_fullStr |
Particulate biogenic silica and carbon production rates and particulate matter distribution in the Indian sector of the Subantarctic Ocean |
title_full_unstemmed |
Particulate biogenic silica and carbon production rates and particulate matter distribution in the Indian sector of the Subantarctic Ocean |
title_sort |
particulate biogenic silica and carbon production rates and particulate matter distribution in the indian sector of the subantarctic ocean |
publisher |
HAL CCSD |
publishDate |
2002 |
url |
https://hal.science/hal-00700118 https://doi.org/10.1016/S0967-0645(02)00078-4 |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0967-0645 Deep Sea Research Part II: Topical Studies in Oceanography https://hal.science/hal-00700118 Deep Sea Research Part II: Topical Studies in Oceanography, 2002, 49 (16), pp.3189-3206. ⟨10.1016/S0967-0645(02)00078-4⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0967-0645(02)00078-4 hal-00700118 https://hal.science/hal-00700118 doi:10.1016/S0967-0645(02)00078-4 |
op_doi |
https://doi.org/10.1016/S0967-0645(02)00078-4 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
49 |
container_issue |
16 |
container_start_page |
3189 |
op_container_end_page |
3206 |
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1782340587693801472 |