The distribution of biogenic silica and the composition of particulate organic matter in the Weddell—Scotia Sea during spring 1988
International audience During EPOS 2 (European Polarstern Study, leg 2, 26 November 1988–5 January 1989 the distribution of biogenic silica (BSi) was determined from the surface to 600 m along two transects (49°W and 47°W) spanning the Scotia Sea, the Weddell—Scotia Confluence (WSC) and the marginal...
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Online Access: | https://hal.univ-brest.fr/hal-00456586 https://doi.org/10.1016/S0304-4203(09)90035-4 |
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ftunivbrest:oai:HAL:hal-00456586v1 2023-11-12T04:02:51+01:00 The distribution of biogenic silica and the composition of particulate organic matter in the Weddell—Scotia Sea during spring 1988 Leynaert, Aude Tréguer, Paul Queguiner, Bernard Morvan, J. Laboratoire de Chimie des Ecosystèmes Marins 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) Ecole Nationale Supérieure de Chimie de Rennes (ENSCR) 1991-04-24 https://hal.univ-brest.fr/hal-00456586 https://doi.org/10.1016/S0304-4203(09)90035-4 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/S0304-4203(09)90035-4 hal-00456586 https://hal.univ-brest.fr/hal-00456586 doi:10.1016/S0304-4203(09)90035-4 ISSN: 0304-4203 Marine Chemistry https://hal.univ-brest.fr/hal-00456586 Marine Chemistry, 1991, 35 (1-4), pp.435-447. ⟨10.1016/S0304-4203(09)90035-4⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 1991 ftunivbrest https://doi.org/10.1016/S0304-4203(09)90035-4 2023-10-31T23:36:03Z International audience During EPOS 2 (European Polarstern Study, leg 2, 26 November 1988–5 January 1989 the distribution of biogenic silica (BSi) was determined from the surface to 600 m along two transects (49°W and 47°W) spanning the Scotia Sea, the Weddell—Scotia Confluence (WSC) and the marginal ice zone (MIZ) of the Weddell Sea. Particulate organic carbon (POC), particulate organic nitrogen (PON) and chlorophyll a concentrations were determined in parallel in surface (10m) samples. In the 0–100 m layer, the distribution of particulate biogenic silica (BSi) showed little correlation with the meltwater field in late November. High BSi concentrations were measured at the end of November in the Weddell—Scotia Confluence (maximum 4.8 μmol l−1), and early in January in the Antarctic Circumpolar Current (maximum at 8.2 μmol l−1) where the wind-mixed layer was only 35 m, creating favourable conditions for phytoplankton growth. However, maximum and mean biogenic silica values remained fairly low as compared with those reported for the Ross Sea. This relatively low silica content of the 0–100 m layer appears to be mainly due to intense grazing which resulted in rapid exportation of particulate material towards the deeper layers. The mean POC/PON molar ratio was 5.5, i.e. significantly lower than the usual Redfield ratio. BSi/POC molar ratios ranged from 0.01 to 0.61, the highest values being found in the Scotia Sea, where siliceous phytoplankton was dominant. The high BSi/POC ratios confirm that diatoms in Antarctic Ocean are able to incorporate unusually high amounts of Si relative to carbon, as compared with other ecosystems. Article in Journal/Newspaper Antarc* Antarctic Antarctic Ocean Ross Sea Scotia Sea Weddell Sea Université de Bretagne Occidentale: HAL Antarctic The Antarctic Weddell Sea Ross Sea Scotia Sea Weddell Antarctic Ocean Marine Chemistry 35 1-4 435 447 |
institution |
Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
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 Leynaert, Aude Tréguer, Paul Queguiner, Bernard Morvan, J. The distribution of biogenic silica and the composition of particulate organic matter in the Weddell—Scotia Sea during spring 1988 |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience During EPOS 2 (European Polarstern Study, leg 2, 26 November 1988–5 January 1989 the distribution of biogenic silica (BSi) was determined from the surface to 600 m along two transects (49°W and 47°W) spanning the Scotia Sea, the Weddell—Scotia Confluence (WSC) and the marginal ice zone (MIZ) of the Weddell Sea. Particulate organic carbon (POC), particulate organic nitrogen (PON) and chlorophyll a concentrations were determined in parallel in surface (10m) samples. In the 0–100 m layer, the distribution of particulate biogenic silica (BSi) showed little correlation with the meltwater field in late November. High BSi concentrations were measured at the end of November in the Weddell—Scotia Confluence (maximum 4.8 μmol l−1), and early in January in the Antarctic Circumpolar Current (maximum at 8.2 μmol l−1) where the wind-mixed layer was only 35 m, creating favourable conditions for phytoplankton growth. However, maximum and mean biogenic silica values remained fairly low as compared with those reported for the Ross Sea. This relatively low silica content of the 0–100 m layer appears to be mainly due to intense grazing which resulted in rapid exportation of particulate material towards the deeper layers. The mean POC/PON molar ratio was 5.5, i.e. significantly lower than the usual Redfield ratio. BSi/POC molar ratios ranged from 0.01 to 0.61, the highest values being found in the Scotia Sea, where siliceous phytoplankton was dominant. The high BSi/POC ratios confirm that diatoms in Antarctic Ocean are able to incorporate unusually high amounts of Si relative to carbon, as compared with other ecosystems. |
author2 |
Laboratoire de Chimie des Ecosystèmes Marins 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) Ecole Nationale Supérieure de Chimie de Rennes (ENSCR) |
format |
Article in Journal/Newspaper |
author |
Leynaert, Aude Tréguer, Paul Queguiner, Bernard Morvan, J. |
author_facet |
Leynaert, Aude Tréguer, Paul Queguiner, Bernard Morvan, J. |
author_sort |
Leynaert, Aude |
title |
The distribution of biogenic silica and the composition of particulate organic matter in the Weddell—Scotia Sea during spring 1988 |
title_short |
The distribution of biogenic silica and the composition of particulate organic matter in the Weddell—Scotia Sea during spring 1988 |
title_full |
The distribution of biogenic silica and the composition of particulate organic matter in the Weddell—Scotia Sea during spring 1988 |
title_fullStr |
The distribution of biogenic silica and the composition of particulate organic matter in the Weddell—Scotia Sea during spring 1988 |
title_full_unstemmed |
The distribution of biogenic silica and the composition of particulate organic matter in the Weddell—Scotia Sea during spring 1988 |
title_sort |
distribution of biogenic silica and the composition of particulate organic matter in the weddell—scotia sea during spring 1988 |
publisher |
HAL CCSD |
publishDate |
1991 |
url |
https://hal.univ-brest.fr/hal-00456586 https://doi.org/10.1016/S0304-4203(09)90035-4 |
geographic |
Antarctic The Antarctic Weddell Sea Ross Sea Scotia Sea Weddell Antarctic Ocean |
geographic_facet |
Antarctic The Antarctic Weddell Sea Ross Sea Scotia Sea Weddell Antarctic Ocean |
genre |
Antarc* Antarctic Antarctic Ocean Ross Sea Scotia Sea Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Ocean Ross Sea Scotia Sea Weddell Sea |
op_source |
ISSN: 0304-4203 Marine Chemistry https://hal.univ-brest.fr/hal-00456586 Marine Chemistry, 1991, 35 (1-4), pp.435-447. ⟨10.1016/S0304-4203(09)90035-4⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0304-4203(09)90035-4 hal-00456586 https://hal.univ-brest.fr/hal-00456586 doi:10.1016/S0304-4203(09)90035-4 |
op_doi |
https://doi.org/10.1016/S0304-4203(09)90035-4 |
container_title |
Marine Chemistry |
container_volume |
35 |
container_issue |
1-4 |
container_start_page |
435 |
op_container_end_page |
447 |
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1782335298617737216 |