Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. I: Assessment and results of an optimum multiparameter analysis
23 páginas, 12 figuras, 5 tablas, 2 apéndices This is the first of two manuscripts dealing with the circulation, mixing, ventilation and organic matter mineralization of the South Atlantic Ocean (SAO). The present work quantifies the complex mixing of water masses in the SAO using a constrained, lea...
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ftcsic:oai:digital.csic.es:10261/91824 2024-02-11T09:58:46+01:00 Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. I: Assessment and results of an optimum multiparameter analysis Álvarez, Marta Brea, S. Mercier, Herlé Álvarez-Salgado, Xosé Antón 2014 http://hdl.handle.net/10261/91824 https://doi.org/10.1016/j.pocean.2013.12.007 en eng Elsevier http://dx.doi.org/10.1016/j.pocean.2013.12.007 Progress in Oceanography 123: 1-23 (2014) 0079-6611 http://hdl.handle.net/10261/91824 doi:10.1016/j.pocean.2013.12.007 open artículo http://purl.org/coar/resource_type/c_6501 2014 ftcsic https://doi.org/10.1016/j.pocean.2013.12.007 2024-01-16T09:56:29Z 23 páginas, 12 figuras, 5 tablas, 2 apéndices This is the first of two manuscripts dealing with the circulation, mixing, ventilation and organic matter mineralization of the South Atlantic Ocean (SAO). The present work quantifies the complex mixing of water masses in the SAO using a constrained, least-squares regression, Optimum MultiParameter (OMP) analysis. The OMP based on temperature, salinity, silicate and the conservative parameter NO, was applied on two World Ocean Circulation (WOCE) lines, A17 and A14, in the western and eastern SAO, respectively. The constrained OMP sensitivity to sources of error in the end-member characteristics, measured parameters, equation weights and oxygen to nitrogen mineralization ratio (RN) was carefully assessed using perturbation tests. Perturbation of RN was the only test that changed significantly the mixing proportions although by less than 5%. The constrained OMP method allowed defining the realm and identifying the core-of-flow of each water mass to study its circulation, the evolution of its chemical composition and, eventually, to separate the contribution of physical and biogeochemical processes. Relevant specific outputs of this first manuscript are: (1) north of the South Equatorial Current, the silicate maximum is primarily composed of Antarctic Intermediate Water (AAIW) rather than Circumpolar Deep Water (CDW); (2) the two degree discontinuity (TDD) experiences a dramatic meridional change of water masses composition, being dominated by North Atlantic Deep Water (NADW) north of the Vema Channel and by CDW southwards; (3) the 50% proportion horizon of Weddell Sea Deep Water (WDSW), with a θ of −0.3 °C at the entry of the SAO, defines the upper limit of the WSDW realm more properly than the classical isopycnals of 46.04 or 46.06 σ4, where the proportion of WSDW is around 75% CICYT, ANT93-1156-E CICYT, ANT94-1168-E IFREMER contract No. 94 1430 087 Spanish Ministry of Science and Innovation (MALASPINA expedition, grant number CSD2008-00077) Spanish ... Article in Journal/Newspaper Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic South Atlantic Ocean Weddell Sea Digital.CSIC (Spanish National Research Council) Antarctic Weddell Weddell Sea Progress in Oceanography 123 1 23 |
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Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
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ftcsic |
language |
English |
description |
23 páginas, 12 figuras, 5 tablas, 2 apéndices This is the first of two manuscripts dealing with the circulation, mixing, ventilation and organic matter mineralization of the South Atlantic Ocean (SAO). The present work quantifies the complex mixing of water masses in the SAO using a constrained, least-squares regression, Optimum MultiParameter (OMP) analysis. The OMP based on temperature, salinity, silicate and the conservative parameter NO, was applied on two World Ocean Circulation (WOCE) lines, A17 and A14, in the western and eastern SAO, respectively. The constrained OMP sensitivity to sources of error in the end-member characteristics, measured parameters, equation weights and oxygen to nitrogen mineralization ratio (RN) was carefully assessed using perturbation tests. Perturbation of RN was the only test that changed significantly the mixing proportions although by less than 5%. The constrained OMP method allowed defining the realm and identifying the core-of-flow of each water mass to study its circulation, the evolution of its chemical composition and, eventually, to separate the contribution of physical and biogeochemical processes. Relevant specific outputs of this first manuscript are: (1) north of the South Equatorial Current, the silicate maximum is primarily composed of Antarctic Intermediate Water (AAIW) rather than Circumpolar Deep Water (CDW); (2) the two degree discontinuity (TDD) experiences a dramatic meridional change of water masses composition, being dominated by North Atlantic Deep Water (NADW) north of the Vema Channel and by CDW southwards; (3) the 50% proportion horizon of Weddell Sea Deep Water (WDSW), with a θ of −0.3 °C at the entry of the SAO, defines the upper limit of the WSDW realm more properly than the classical isopycnals of 46.04 or 46.06 σ4, where the proportion of WSDW is around 75% CICYT, ANT93-1156-E CICYT, ANT94-1168-E IFREMER contract No. 94 1430 087 Spanish Ministry of Science and Innovation (MALASPINA expedition, grant number CSD2008-00077) Spanish ... |
format |
Article in Journal/Newspaper |
author |
Álvarez, Marta Brea, S. Mercier, Herlé Álvarez-Salgado, Xosé Antón |
spellingShingle |
Álvarez, Marta Brea, S. Mercier, Herlé Álvarez-Salgado, Xosé Antón Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. I: Assessment and results of an optimum multiparameter analysis |
author_facet |
Álvarez, Marta Brea, S. Mercier, Herlé Álvarez-Salgado, Xosé Antón |
author_sort |
Álvarez, Marta |
title |
Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. I: Assessment and results of an optimum multiparameter analysis |
title_short |
Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. I: Assessment and results of an optimum multiparameter analysis |
title_full |
Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. I: Assessment and results of an optimum multiparameter analysis |
title_fullStr |
Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. I: Assessment and results of an optimum multiparameter analysis |
title_full_unstemmed |
Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. I: Assessment and results of an optimum multiparameter analysis |
title_sort |
mineralization of biogenic materials in the water masses of the south atlantic ocean. i: assessment and results of an optimum multiparameter analysis |
publisher |
Elsevier |
publishDate |
2014 |
url |
http://hdl.handle.net/10261/91824 https://doi.org/10.1016/j.pocean.2013.12.007 |
geographic |
Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic South Atlantic Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic South Atlantic Ocean Weddell Sea |
op_relation |
http://dx.doi.org/10.1016/j.pocean.2013.12.007 Progress in Oceanography 123: 1-23 (2014) 0079-6611 http://hdl.handle.net/10261/91824 doi:10.1016/j.pocean.2013.12.007 |
op_rights |
open |
op_doi |
https://doi.org/10.1016/j.pocean.2013.12.007 |
container_title |
Progress in Oceanography |
container_volume |
123 |
container_start_page |
1 |
op_container_end_page |
23 |
_version_ |
1790594514206851072 |