Dissolved organic matter cycling in the confluence of the Atlantic and Indian oceans south of Africa
The boundary between the Atlantic and Indian sectors of the Southern Ocean is a key spot of the thermohaline circulation, where the following water masses mix up: Indian Central water (ICW), South Atlantic Central Water (SACW), Antarctic Intermediate Water (AAIW), Circumpolar Deep Water (CDW), North...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Centro Oceanográfico de A Coruña
2014
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ftcsic:oai:digital.csic.es:10261/316298 2024-02-11T09:58:02+01:00 Dissolved organic matter cycling in the confluence of the Atlantic and Indian oceans south of Africa Guerrero-Feijóo, E. (Elisa) Nieto-Cid, M. (Mar) Álvarez, M. (Marta) Álvarez-Salgado, X.A. Indian Ocean Atlantic Ocean 2014-08-11T09:49:48Z http://hdl.handle.net/10508/1774 http://hdl.handle.net/10261/316298 https://doi.org/10.1016/j.dsr.2013.08.008 unknown Centro Oceanográfico de A Coruña 0967-0637 http://hdl.handle.net/10508/1774 http://hdl.handle.net/10261/316298 doi:10.1016/j.dsr.2013.08.008 Deep-Sea Research Part I-Oceanographic Research Papers, 83. 2014: 12-23 6191 none research article 2014 ftcsic https://doi.org/10.1016/j.dsr.2013.08.008 2024-01-16T11:44:28Z The boundary between the Atlantic and Indian sectors of the Southern Ocean is a key spot of the thermohaline circulation, where the following water masses mix up: Indian Central water (ICW), South Atlantic Central Water (SACW), Antarctic Intermediate Water (AAIW), Circumpolar Deep Water (CDW), North Atlantic Deep Water (NADW), Weddell Sea Deep Water (WSDW) and Antarctic Winter Water (WW). An optimum multiparameter analysis based on the distributions of potential temperature, salinity, NO (=O2+9.3×NO3) and silicate during the GoodHope 2004 (GH04) cruise allowed us to (i) define the realms of these water masses; (ii) obtain the water mass proportion weighted-average (archetypal) apparent oxygen utilization (AOU) and dissolved organic carbon (DOC) concentrations of each water mass; and (iii) estimate the contribution of DOC to the oxygen demand of the study area. WW represented only 5.2% of the water volume sampled during GH04, followed by WSDW with 10.8%, NADW with 12.7%, SACW with 15.3%, AAIW with 23.1% and CDW with 32.8%. The distributions of DOC and AOU were mainly explained by the mixing of archetypal concentrations of these variables, 75±5% and 65±3% respectively, which retained the variability due to the basin-scale mineralization from the formation area to the barycentre of each water mass along the GH04 line. DOC accounted for 26±2% and 12±5% of the oxygen demand of the meso- and bathypelagic ocean, respectively. Conversely, local mineralization processes, retained by the residuals of the archetypal concentrations of DOC and AOU, did not contribute to improve significantly the mixing model of DOC. 2 Article in Journal/Newspaper Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Southern Ocean Weddell Sea Digital.CSIC (Spanish National Research Council) Antarctic Indian Southern Ocean Weddell Weddell Sea Deep Sea Research Part I: Oceanographic Research Papers 83 12 23 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
description |
The boundary between the Atlantic and Indian sectors of the Southern Ocean is a key spot of the thermohaline circulation, where the following water masses mix up: Indian Central water (ICW), South Atlantic Central Water (SACW), Antarctic Intermediate Water (AAIW), Circumpolar Deep Water (CDW), North Atlantic Deep Water (NADW), Weddell Sea Deep Water (WSDW) and Antarctic Winter Water (WW). An optimum multiparameter analysis based on the distributions of potential temperature, salinity, NO (=O2+9.3×NO3) and silicate during the GoodHope 2004 (GH04) cruise allowed us to (i) define the realms of these water masses; (ii) obtain the water mass proportion weighted-average (archetypal) apparent oxygen utilization (AOU) and dissolved organic carbon (DOC) concentrations of each water mass; and (iii) estimate the contribution of DOC to the oxygen demand of the study area. WW represented only 5.2% of the water volume sampled during GH04, followed by WSDW with 10.8%, NADW with 12.7%, SACW with 15.3%, AAIW with 23.1% and CDW with 32.8%. The distributions of DOC and AOU were mainly explained by the mixing of archetypal concentrations of these variables, 75±5% and 65±3% respectively, which retained the variability due to the basin-scale mineralization from the formation area to the barycentre of each water mass along the GH04 line. DOC accounted for 26±2% and 12±5% of the oxygen demand of the meso- and bathypelagic ocean, respectively. Conversely, local mineralization processes, retained by the residuals of the archetypal concentrations of DOC and AOU, did not contribute to improve significantly the mixing model of DOC. 2 |
format |
Article in Journal/Newspaper |
author |
Guerrero-Feijóo, E. (Elisa) Nieto-Cid, M. (Mar) Álvarez, M. (Marta) Álvarez-Salgado, X.A. |
spellingShingle |
Guerrero-Feijóo, E. (Elisa) Nieto-Cid, M. (Mar) Álvarez, M. (Marta) Álvarez-Salgado, X.A. Dissolved organic matter cycling in the confluence of the Atlantic and Indian oceans south of Africa |
author_facet |
Guerrero-Feijóo, E. (Elisa) Nieto-Cid, M. (Mar) Álvarez, M. (Marta) Álvarez-Salgado, X.A. |
author_sort |
Guerrero-Feijóo, E. (Elisa) |
title |
Dissolved organic matter cycling in the confluence of the Atlantic and Indian oceans south of Africa |
title_short |
Dissolved organic matter cycling in the confluence of the Atlantic and Indian oceans south of Africa |
title_full |
Dissolved organic matter cycling in the confluence of the Atlantic and Indian oceans south of Africa |
title_fullStr |
Dissolved organic matter cycling in the confluence of the Atlantic and Indian oceans south of Africa |
title_full_unstemmed |
Dissolved organic matter cycling in the confluence of the Atlantic and Indian oceans south of Africa |
title_sort |
dissolved organic matter cycling in the confluence of the atlantic and indian oceans south of africa |
publisher |
Centro Oceanográfico de A Coruña |
publishDate |
2014 |
url |
http://hdl.handle.net/10508/1774 http://hdl.handle.net/10261/316298 https://doi.org/10.1016/j.dsr.2013.08.008 |
op_coverage |
Indian Ocean Atlantic Ocean |
geographic |
Antarctic Indian Southern Ocean Weddell Weddell Sea |
geographic_facet |
Antarctic Indian Southern Ocean Weddell Weddell Sea |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Southern Ocean Weddell Sea |
op_relation |
0967-0637 http://hdl.handle.net/10508/1774 http://hdl.handle.net/10261/316298 doi:10.1016/j.dsr.2013.08.008 Deep-Sea Research Part I-Oceanographic Research Papers, 83. 2014: 12-23 6191 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.dsr.2013.08.008 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
83 |
container_start_page |
12 |
op_container_end_page |
23 |
_version_ |
1790593593357893632 |