Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. II: stoichiometric ratios and mineralization rates
39 páginas, 6 figuras, 9 tablas, 1 apéndice The variability of nitrate (N), phosphate (P), silicate (Si) and Apparent Oxygen Utilization (AOU) due to water mass mixing was objectively separated from the variability due to mineralization of biogenic materials in the western and eastern South Atlantic...
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ftcsic:oai:digital.csic.es:10261/91890 2024-02-11T10:08:36+01:00 Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. II: stoichiometric ratios and mineralization rates Álvarez-Salgado, Xosé Antón Álvarez, Marta Brea, S. Mémery, L. Messias, M. J. 2014 http://hdl.handle.net/10261/91890 https://doi.org/10.1016/j.pocean.2013.12.009 en eng Elsevier http://dx.doi.org/10.1016/j.pocean.2013.12.009 Progress in Oceanography 123: 24-37 (2014) 0079-6611 http://hdl.handle.net/10261/91890 doi:10.1016/j.pocean.2013.12.009 open Separation of biogeochemical from mixing variability Consensus linear regression Nutrientratios OURs Organic matter mineralization fractionation artículo http://purl.org/coar/resource_type/c_6501 2014 ftcsic https://doi.org/10.1016/j.pocean.2013.12.009 2024-01-16T09:56:32Z 39 páginas, 6 figuras, 9 tablas, 1 apéndice The variability of nitrate (N), phosphate (P), silicate (Si) and Apparent Oxygen Utilization (AOU) due to water mass mixing was objectively separated from the variability due to mineralization of biogenic materials in the western and eastern South Atlantic Ocean on basis of the constrained Optimum MultiParameter (OMP) analysis implemented in the companion manuscript. Using a consensus linear regression model, AOU/N/P/Si mineralization ratios and the corresponding oxygen utilisation rates (OURs) were obtained for the realm of each water mass defined after the OMP analysis. Combining these results with a stoichiometric model, the organic carbon to nitrogen (C/N) ratios and the biochemical composition (carbohydrates+lipids, proteins and phosphorus compounds) of the mineralized material, were derived. The vertical variability of the AOU/N, AOU/P and AOU/C mineralization ratios pointed to a significant fractionation during the mineralization of sinking organic matter. This fractionation was confirmed by preferential consumption of organic phosphorous compounds and proteins in shallower levels, which produced an increase of the C/N ratio of the mineralised materials of 0.5 ± 0.2 mol C mol N–1 every 1000 dbar. OURs in the twilight zone decreased quadratically with the C/N molar ratio of the mineralised material and exponentially with pressure (p, in 103 dbar) according to the following regression equation: Ln (OUR) = 6.2(±1.2) – 2.0 (±0.7) · Ln (C/N) – 0.6 (±0.2) · p (r2 = 0.87, p < 0.006, n = 8). This variability in the rates and stoichiometric ratios of the biogenic material mineralization compromises our capacity to predict the ocean biogeochemistry response to global change, including the CO2 uptake and storage and the corresponding feedback mechanisms Spanish CICYT contracts ANT93-1156-E and ANT94-1168-E IFREMER contract No 94 1430 087 Spanish Ministry of Science and Innovation (MALASPINA expedition, grant number CSD2008-00077) Spanish Ministry of Science ... Article in Journal/Newspaper South Atlantic Ocean Digital.CSIC (Spanish National Research Council) Progress in Oceanography 123 24 37 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Separation of biogeochemical from mixing variability Consensus linear regression Nutrientratios OURs Organic matter mineralization fractionation |
spellingShingle |
Separation of biogeochemical from mixing variability Consensus linear regression Nutrientratios OURs Organic matter mineralization fractionation Álvarez-Salgado, Xosé Antón Álvarez, Marta Brea, S. Mémery, L. Messias, M. J. Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. II: stoichiometric ratios and mineralization rates |
topic_facet |
Separation of biogeochemical from mixing variability Consensus linear regression Nutrientratios OURs Organic matter mineralization fractionation |
description |
39 páginas, 6 figuras, 9 tablas, 1 apéndice The variability of nitrate (N), phosphate (P), silicate (Si) and Apparent Oxygen Utilization (AOU) due to water mass mixing was objectively separated from the variability due to mineralization of biogenic materials in the western and eastern South Atlantic Ocean on basis of the constrained Optimum MultiParameter (OMP) analysis implemented in the companion manuscript. Using a consensus linear regression model, AOU/N/P/Si mineralization ratios and the corresponding oxygen utilisation rates (OURs) were obtained for the realm of each water mass defined after the OMP analysis. Combining these results with a stoichiometric model, the organic carbon to nitrogen (C/N) ratios and the biochemical composition (carbohydrates+lipids, proteins and phosphorus compounds) of the mineralized material, were derived. The vertical variability of the AOU/N, AOU/P and AOU/C mineralization ratios pointed to a significant fractionation during the mineralization of sinking organic matter. This fractionation was confirmed by preferential consumption of organic phosphorous compounds and proteins in shallower levels, which produced an increase of the C/N ratio of the mineralised materials of 0.5 ± 0.2 mol C mol N–1 every 1000 dbar. OURs in the twilight zone decreased quadratically with the C/N molar ratio of the mineralised material and exponentially with pressure (p, in 103 dbar) according to the following regression equation: Ln (OUR) = 6.2(±1.2) – 2.0 (±0.7) · Ln (C/N) – 0.6 (±0.2) · p (r2 = 0.87, p < 0.006, n = 8). This variability in the rates and stoichiometric ratios of the biogenic material mineralization compromises our capacity to predict the ocean biogeochemistry response to global change, including the CO2 uptake and storage and the corresponding feedback mechanisms Spanish CICYT contracts ANT93-1156-E and ANT94-1168-E IFREMER contract No 94 1430 087 Spanish Ministry of Science and Innovation (MALASPINA expedition, grant number CSD2008-00077) Spanish Ministry of Science ... |
format |
Article in Journal/Newspaper |
author |
Álvarez-Salgado, Xosé Antón Álvarez, Marta Brea, S. Mémery, L. Messias, M. J. |
author_facet |
Álvarez-Salgado, Xosé Antón Álvarez, Marta Brea, S. Mémery, L. Messias, M. J. |
author_sort |
Álvarez-Salgado, Xosé Antón |
title |
Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. II: stoichiometric ratios and mineralization rates |
title_short |
Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. II: stoichiometric ratios and mineralization rates |
title_full |
Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. II: stoichiometric ratios and mineralization rates |
title_fullStr |
Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. II: stoichiometric ratios and mineralization rates |
title_full_unstemmed |
Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. II: stoichiometric ratios and mineralization rates |
title_sort |
mineralization of biogenic materials in the water masses of the south atlantic ocean. ii: stoichiometric ratios and mineralization rates |
publisher |
Elsevier |
publishDate |
2014 |
url |
http://hdl.handle.net/10261/91890 https://doi.org/10.1016/j.pocean.2013.12.009 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
http://dx.doi.org/10.1016/j.pocean.2013.12.009 Progress in Oceanography 123: 24-37 (2014) 0079-6611 http://hdl.handle.net/10261/91890 doi:10.1016/j.pocean.2013.12.009 |
op_rights |
open |
op_doi |
https://doi.org/10.1016/j.pocean.2013.12.009 |
container_title |
Progress in Oceanography |
container_volume |
123 |
container_start_page |
24 |
op_container_end_page |
37 |
_version_ |
1790608037947375616 |