THE SILICA CYCLE IN THE ANTARCTIC OCEAN - IS THE WEDDELL SEA ATYPICAL
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 (conc...
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Inter Research
1993
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ftoskarbordeaux:oai:oskar-bordeaux.fr:20.500.12278/28050 2023-05-15T13:57:07+02:00 THE SILICA CYCLE IN THE ANTARCTIC OCEAN - IS THE WEDDELL SEA ATYPICAL LEYNAERT, Aude NELSON, David QUEGUINER, Bernard TRÉGUER, Paul 1993-06-03 https://oskar-bordeaux.fr/handle/20.500.12278/28050 en eng Inter Research 0171-8630 https://oskar-bordeaux.fr/handle/20.500.12278/28050 http://creativecommons.org/licenses/by/ Planète et Univers [physics]/Sciences de la Terre/Océanographie Article de revue 1993 ftoskarbordeaux 2021-05-11T22:29:06Z 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. Other/Unknown Material Antarc* Antarctic Antarctic Ocean Joinville Island Southern Ocean Weddell Sea OSKAR Bordeaux (Open Science Knowledge ARchive) Antarctic Antarctic Ocean Joinville ENVELOPE(-55.867,-55.867,-63.250,-63.250) Joinville Island ENVELOPE(-55.667,-55.667,-63.350,-63.350) Southern Ocean The Antarctic Weddell Weddell Sea |
institution |
Open Polar |
collection |
OSKAR Bordeaux (Open Science Knowledge ARchive) |
op_collection_id |
ftoskarbordeaux |
language |
English |
topic |
Planète et Univers [physics]/Sciences de la Terre/Océanographie |
spellingShingle |
Planète et Univers [physics]/Sciences de la Terre/Océanographie LEYNAERT, Aude NELSON, David QUEGUINER, Bernard TRÉGUER, Paul THE SILICA CYCLE IN THE ANTARCTIC OCEAN - IS THE WEDDELL SEA ATYPICAL |
topic_facet |
Planète et Univers [physics]/Sciences de la Terre/Océanographie |
description |
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. |
format |
Other/Unknown Material |
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 |
Inter Research |
publishDate |
1993 |
url |
https://oskar-bordeaux.fr/handle/20.500.12278/28050 |
long_lat |
ENVELOPE(-55.867,-55.867,-63.250,-63.250) ENVELOPE(-55.667,-55.667,-63.350,-63.350) |
geographic |
Antarctic Antarctic Ocean Joinville Joinville Island Southern Ocean The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Ocean Joinville Joinville Island Southern Ocean The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Ocean Joinville Island Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Ocean Joinville Island Southern Ocean Weddell Sea |
op_relation |
0171-8630 https://oskar-bordeaux.fr/handle/20.500.12278/28050 |
op_rights |
http://creativecommons.org/licenses/by/ |
_version_ |
1766264713876865024 |