THE SILICA CYCLE IN THE ANTARCTIC OCEAN - IS THE WEDDELL SEA ATYPICAL
International audience The lowest biogenic silica production rates in the Southern Ocean (average of 2.59 mmol Si m-2 d-1) have been recorded in an area of heavy ice cover along a transect through the Weddell Sea from Joinville Island to Cap Norvegia (November-December 1990). The associated biomass...
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1993
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ftunivbrest:oai:HAL:hal-00456581v1 2023-06-11T04:06:05+02:00 THE SILICA CYCLE IN THE ANTARCTIC OCEAN - IS THE WEDDELL SEA ATYPICAL Leynaert, Aude Nelson, David, Queguiner, Bernard Tréguer, Paul Centre National de la Recherche Scientifique (CNRS) College of Oceanography Oregon State University (OSU) 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 de Brest (UBO) 1993-06-03 https://hal.univ-brest.fr/hal-00456581 https://hal.univ-brest.fr/hal-00456581/document https://hal.univ-brest.fr/hal-00456581/file/m096p001.pdf en eng HAL CCSD Inter Research hal-00456581 https://hal.univ-brest.fr/hal-00456581 https://hal.univ-brest.fr/hal-00456581/document https://hal.univ-brest.fr/hal-00456581/file/m096p001.pdf http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.univ-brest.fr/hal-00456581 Marine Ecology Progress Series, 1993, 96 (1), pp.1-15 [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 1993 ftunivbrest 2023-05-02T22:38:52Z International audience The lowest biogenic silica production rates in the Southern Ocean (average of 2.59 mmol Si m-2 d-1) have been recorded in an area of heavy ice cover along a transect through the Weddell Sea from Joinville Island to Cap Norvegia (November-December 1990). The associated biomass was also very low (concentrations less-than-or-equal-to 0.6 mumol l-1 for biogenic silica and less-than-or-equal-to 0.8 mug l-1 for chlorophyll a). Based upon these direct measurements of biogenic silica production rates and other data available from the marginal ice zone and open ocean areas, we estimated the annual production of biogenic silica in the northern Weddell Sea to be 810 to 870 mmol m-2 yr-1. This leads to a revised estimate of the total annual biogenic silica production in the Southern Ocean of between 11 and 32 Tmol Si yr-1. Comparing our annual production estimate to previous estimates of vertical flux of opal in the Weddell Sea, we conclude that no more than 1 % of the silica produced annually by phytoplankton in the upper water column reaches a depth of 800 m. This is consistent with the general distribution of high accumulation rates of opal in Southern Ocean sediments which evidence an unexplained gap in the Weddell Sea. Thus, regarding the cycling of biogenic silica in the Southern Ocean, the Weddell Sea appears to be atypical. Article in Journal/Newspaper Antarc* Antarctic Antarctic Ocean Joinville Island Southern Ocean Weddell Sea Université de Bretagne Occidentale: HAL Antarctic Southern Ocean The Antarctic Weddell Sea Weddell Antarctic Ocean Joinville ENVELOPE(-55.867,-55.867,-63.250,-63.250) Joinville Island ENVELOPE(-55.667,-55.667,-63.350,-63.350) |
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 Nelson, David, Queguiner, Bernard Tréguer, Paul THE SILICA CYCLE IN THE ANTARCTIC OCEAN - IS THE WEDDELL SEA ATYPICAL |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience The lowest biogenic silica production rates in the Southern Ocean (average of 2.59 mmol Si m-2 d-1) have been recorded in an area of heavy ice cover along a transect through the Weddell Sea from Joinville Island to Cap Norvegia (November-December 1990). The associated biomass was also very low (concentrations less-than-or-equal-to 0.6 mumol l-1 for biogenic silica and less-than-or-equal-to 0.8 mug l-1 for chlorophyll a). Based upon these direct measurements of biogenic silica production rates and other data available from the marginal ice zone and open ocean areas, we estimated the annual production of biogenic silica in the northern Weddell Sea to be 810 to 870 mmol m-2 yr-1. This leads to a revised estimate of the total annual biogenic silica production in the Southern Ocean of between 11 and 32 Tmol Si yr-1. Comparing our annual production estimate to previous estimates of vertical flux of opal in the Weddell Sea, we conclude that no more than 1 % of the silica produced annually by phytoplankton in the upper water column reaches a depth of 800 m. This is consistent with the general distribution of high accumulation rates of opal in Southern Ocean sediments which evidence an unexplained gap in the Weddell Sea. Thus, regarding the cycling of biogenic silica in the Southern Ocean, the Weddell Sea appears to be atypical. |
author2 |
Centre National de la Recherche Scientifique (CNRS) College of Oceanography Oregon State University (OSU) 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 de Brest (UBO) |
format |
Article in Journal/Newspaper |
author |
Leynaert, Aude Nelson, David, Queguiner, Bernard Tréguer, Paul |
author_facet |
Leynaert, Aude Nelson, David, Queguiner, Bernard Tréguer, Paul |
author_sort |
Leynaert, Aude |
title |
THE SILICA CYCLE IN THE ANTARCTIC OCEAN - IS THE WEDDELL SEA ATYPICAL |
title_short |
THE SILICA CYCLE IN THE ANTARCTIC OCEAN - IS THE WEDDELL SEA ATYPICAL |
title_full |
THE SILICA CYCLE IN THE ANTARCTIC OCEAN - IS THE WEDDELL SEA ATYPICAL |
title_fullStr |
THE SILICA CYCLE IN THE ANTARCTIC OCEAN - IS THE WEDDELL SEA ATYPICAL |
title_full_unstemmed |
THE SILICA CYCLE IN THE ANTARCTIC OCEAN - IS THE WEDDELL SEA ATYPICAL |
title_sort |
silica cycle in the antarctic ocean - is the weddell sea atypical |
publisher |
HAL CCSD |
publishDate |
1993 |
url |
https://hal.univ-brest.fr/hal-00456581 https://hal.univ-brest.fr/hal-00456581/document https://hal.univ-brest.fr/hal-00456581/file/m096p001.pdf |
long_lat |
ENVELOPE(-55.867,-55.867,-63.250,-63.250) ENVELOPE(-55.667,-55.667,-63.350,-63.350) |
geographic |
Antarctic Southern Ocean The Antarctic Weddell Sea Weddell Antarctic Ocean Joinville Joinville Island |
geographic_facet |
Antarctic Southern Ocean The Antarctic Weddell Sea Weddell Antarctic Ocean Joinville Joinville Island |
genre |
Antarc* Antarctic Antarctic Ocean Joinville Island Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Ocean Joinville Island Southern Ocean Weddell Sea |
op_source |
ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.univ-brest.fr/hal-00456581 Marine Ecology Progress Series, 1993, 96 (1), pp.1-15 |
op_relation |
hal-00456581 https://hal.univ-brest.fr/hal-00456581 https://hal.univ-brest.fr/hal-00456581/document https://hal.univ-brest.fr/hal-00456581/file/m096p001.pdf |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
_version_ |
1768377831089242112 |