Description of the biogeochemical features of the subtropical southeastern Atlantic and the Southern Ocean south of South Africa during the austral summer of the International Polar Year
International audience Meridional and vertical distributions of several biogeochemical parameters were studied along a section in the southeastern Atlantic and the Southern Ocean south of South Africa during the austral summer 2008 of the International Polar Year to characterize the biogeochemical p...
Published in: | Biogeosciences |
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Main Authors: | , , , , , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2013
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Online Access: | https://hal.univ-brest.fr/hal-00789087 https://hal.univ-brest.fr/hal-00789087/document https://hal.univ-brest.fr/hal-00789087/file/bg-lemoigne10-281-2013.pdf https://doi.org/10.5194/bg-10-281-2013 |
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ftinsu:oai:HAL:hal-00789087v1 |
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openpolar |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes Le Moigne, F.A Boye, Marie Masson, A. Corvaisier, Rudolph Grossteffan, E. Gueneugues, A. Pondaven, Philippe Description of the biogeochemical features of the subtropical southeastern Atlantic and the Southern Ocean south of South Africa during the austral summer of the International Polar Year |
topic_facet |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience Meridional and vertical distributions of several biogeochemical parameters were studied along a section in the southeastern Atlantic and the Southern Ocean south of South Africa during the austral summer 2008 of the International Polar Year to characterize the biogeochemical provinces and to assess the seasonal net diatom production. Based on analyses of macro-nutrients, ammonium (NH4), chlorophyll a, (Chl a), phaeopigments, biogenic silica (BSi), particulate inorganic carbon (PIC), and particulate organic carbon and nitrogen (POC and PON, respectively), four biogeochemical domains were distinguished along the section: the subtropical Atlantic, the confluence zone of the subtropical and subantarctic domains, the Polar Frontal Zone (PFZ) in the Antarctic Circumpolar Current (ACC), and the north-eastern branch of the Weddell Gyre. The subtropical region displayed extremely low nutrient concentrations featuring oligotrophic conditions, and sub-surface maxima of Chl a and phaeopigments never exceeded 0.5 µg L−1 and 0.25 µg L−1, respectively. The anticyclonic and cyclonic eddies crossed in the Cape Basin were characterized by a deepening and a rise, respectively, of the nutrients isoclines. The confluence zone of the subtropical domain and the northern side of the ACC within the subantarctic domain displayed remnant nitrate and phosphate levels, whereas silicate concentrations kept to extremely low levels. In this area, Chl a level of 0.4-0.5 µg L−1 distributed homogenously within the mixed layer, and POC and PON accumulated to values up to 10 µM and 1.5 µM, respectively, indicative of biomass accumulation along the confluence zone during the late productive period. In the ACC domain, the Polar Frontal Zone was marked by a post-bloom of diatoms that extended beyond the Polar Front (PF) during this late summer condition, as primarily evidenced by the massive depletion of silicic acid in the surface waters. The accumulation of NH4 to values up to 1.25 µM at 100 m depth centred on the PF and the ... |
author2 |
National Oceanography Centre (NOC) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Université de Brest (UBO) |
format |
Article in Journal/Newspaper |
author |
Le Moigne, F.A Boye, Marie Masson, A. Corvaisier, Rudolph Grossteffan, E. Gueneugues, A. Pondaven, Philippe |
author_facet |
Le Moigne, F.A Boye, Marie Masson, A. Corvaisier, Rudolph Grossteffan, E. Gueneugues, A. Pondaven, Philippe |
author_sort |
Le Moigne, F.A |
title |
Description of the biogeochemical features of the subtropical southeastern Atlantic and the Southern Ocean south of South Africa during the austral summer of the International Polar Year |
title_short |
Description of the biogeochemical features of the subtropical southeastern Atlantic and the Southern Ocean south of South Africa during the austral summer of the International Polar Year |
title_full |
Description of the biogeochemical features of the subtropical southeastern Atlantic and the Southern Ocean south of South Africa during the austral summer of the International Polar Year |
title_fullStr |
Description of the biogeochemical features of the subtropical southeastern Atlantic and the Southern Ocean south of South Africa during the austral summer of the International Polar Year |
title_full_unstemmed |
Description of the biogeochemical features of the subtropical southeastern Atlantic and the Southern Ocean south of South Africa during the austral summer of the International Polar Year |
title_sort |
description of the biogeochemical features of the subtropical southeastern atlantic and the southern ocean south of south africa during the austral summer of the international polar year |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.univ-brest.fr/hal-00789087 https://hal.univ-brest.fr/hal-00789087/document https://hal.univ-brest.fr/hal-00789087/file/bg-lemoigne10-281-2013.pdf https://doi.org/10.5194/bg-10-281-2013 |
geographic |
Antarctic Southern Ocean The Antarctic Austral Weddell |
geographic_facet |
Antarctic Southern Ocean The Antarctic Austral Weddell |
genre |
Antarc* Antarctic International Polar Year Southern Ocean |
genre_facet |
Antarc* Antarctic International Polar Year Southern Ocean |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.univ-brest.fr/hal-00789087 Biogeosciences, 2013, 10, pp.281-295. ⟨10.5194/bg-10-281-2013⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-10-281-2013 hal-00789087 https://hal.univ-brest.fr/hal-00789087 https://hal.univ-brest.fr/hal-00789087/document https://hal.univ-brest.fr/hal-00789087/file/bg-lemoigne10-281-2013.pdf doi:10.5194/bg-10-281-2013 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bg-10-281-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
1 |
container_start_page |
281 |
op_container_end_page |
295 |
_version_ |
1790600751059304448 |
spelling |
ftinsu:oai:HAL:hal-00789087v1 2024-02-11T09:56:07+01:00 Description of the biogeochemical features of the subtropical southeastern Atlantic and the Southern Ocean south of South Africa during the austral summer of the International Polar Year Le Moigne, F.A Boye, Marie Masson, A. Corvaisier, Rudolph Grossteffan, E. Gueneugues, A. Pondaven, Philippe National Oceanography Centre (NOC) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Université de Brest (UBO) 2013-01-18 https://hal.univ-brest.fr/hal-00789087 https://hal.univ-brest.fr/hal-00789087/document https://hal.univ-brest.fr/hal-00789087/file/bg-lemoigne10-281-2013.pdf https://doi.org/10.5194/bg-10-281-2013 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-10-281-2013 hal-00789087 https://hal.univ-brest.fr/hal-00789087 https://hal.univ-brest.fr/hal-00789087/document https://hal.univ-brest.fr/hal-00789087/file/bg-lemoigne10-281-2013.pdf doi:10.5194/bg-10-281-2013 info:eu-repo/semantics/OpenAccess ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.univ-brest.fr/hal-00789087 Biogeosciences, 2013, 10, pp.281-295. ⟨10.5194/bg-10-281-2013⟩ [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2013 ftinsu https://doi.org/10.5194/bg-10-281-2013 2024-01-24T17:23:12Z International audience Meridional and vertical distributions of several biogeochemical parameters were studied along a section in the southeastern Atlantic and the Southern Ocean south of South Africa during the austral summer 2008 of the International Polar Year to characterize the biogeochemical provinces and to assess the seasonal net diatom production. Based on analyses of macro-nutrients, ammonium (NH4), chlorophyll a, (Chl a), phaeopigments, biogenic silica (BSi), particulate inorganic carbon (PIC), and particulate organic carbon and nitrogen (POC and PON, respectively), four biogeochemical domains were distinguished along the section: the subtropical Atlantic, the confluence zone of the subtropical and subantarctic domains, the Polar Frontal Zone (PFZ) in the Antarctic Circumpolar Current (ACC), and the north-eastern branch of the Weddell Gyre. The subtropical region displayed extremely low nutrient concentrations featuring oligotrophic conditions, and sub-surface maxima of Chl a and phaeopigments never exceeded 0.5 µg L−1 and 0.25 µg L−1, respectively. The anticyclonic and cyclonic eddies crossed in the Cape Basin were characterized by a deepening and a rise, respectively, of the nutrients isoclines. The confluence zone of the subtropical domain and the northern side of the ACC within the subantarctic domain displayed remnant nitrate and phosphate levels, whereas silicate concentrations kept to extremely low levels. In this area, Chl a level of 0.4-0.5 µg L−1 distributed homogenously within the mixed layer, and POC and PON accumulated to values up to 10 µM and 1.5 µM, respectively, indicative of biomass accumulation along the confluence zone during the late productive period. In the ACC domain, the Polar Frontal Zone was marked by a post-bloom of diatoms that extended beyond the Polar Front (PF) during this late summer condition, as primarily evidenced by the massive depletion of silicic acid in the surface waters. The accumulation of NH4 to values up to 1.25 µM at 100 m depth centred on the PF and the ... Article in Journal/Newspaper Antarc* Antarctic International Polar Year Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Antarctic Southern Ocean The Antarctic Austral Weddell Biogeosciences 10 1 281 295 |