Carbon dioxide along WOCE line A14: Water masses characterization and anthropogenic entry
16 páginas, 12 figuras, 2 tablas The meridional WOCE line A14, just east of the South Atlantic Mid-Atlantic Ridge, was surveyed during the austral summer of 1995 from 4°N to 45°S. Full-depth profiles of pH, total alkalinity (TA), and total inorganic carbon (CT) were measured, allowing a test of the...
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ftcsic:oai:digital.csic.es:10261/52194 2024-02-11T09:56:33+01:00 Carbon dioxide along WOCE line A14: Water masses characterization and anthropogenic entry Ríos, Aida F. Álvarez-Salgado, Xosé Antón Pérez, Fiz F. Bingler, L. S. Arístegui, Javier Mémery, L. 2003 http://hdl.handle.net/10261/52194 https://doi.org/10.1029/2000JC000366 en eng American Geophysical Union http://dx.doi.org/10.1029/2000JC000366 Journal of Geophysical Research - Part C - Oceans 108: 3123 (2003) 0148-0227 http://hdl.handle.net/10261/52194 doi:10.1029/2000JC000366 2156-2202 open CO2 Anthropogenic carbon Water masses South Atlantic artículo http://purl.org/coar/resource_type/c_6501 2003 ftcsic https://doi.org/10.1029/2000JC000366 2024-01-16T09:38:54Z 16 páginas, 12 figuras, 2 tablas The meridional WOCE line A14, just east of the South Atlantic Mid-Atlantic Ridge, was surveyed during the austral summer of 1995 from 4°N to 45°S. Full-depth profiles of pH, total alkalinity (TA), and total inorganic carbon (CT) were measured, allowing a test of the internal consistency of the CO2 system parameters. The correlation between CT measured and calculated from pH and TA was very good (r2 = 0.998), with an insignificant average difference of 0.1 ± 3.0 μmol kg−1 (n = 964 data). CO2 certified reference materials (CRMs) and a collection of selected samples subsequently analyzed at the Scripps Institution of Oceanography were used to assess the accuracy of our measurements at sea with satisfactory results. The three measured CO2 system variables were then used to identify the characteristic array of zonal flows throughout the South Atlantic intersected by A14. Equatorial, subequatorial, subtropical, and subantarctic domains were identified at the depth range of the surface water, South Atlantic Central Water (SACW), Antarctic Intermediate Water (AAIW), Upper Circumpolar Water (UCPW), North Atlantic Deep Water (NADW) and Antarctic Bottom Water (AABW). The nonconservative CO2 system parameters (pH, TA, CT) have been useful in identifying the transition from aged subequatorial to ventilated subtropical surface, central and intermediate waters. They have been identified as good tracers of the zonal circulation of NADW, with marked flows at the equator, 13°S, and 22°S (the “Namib Col Current”) and the sharp transition from UNADW to UCPW at 23°S. The anthropogenic CO2 inventory (CANT) was estimated and compared with CFC-derived apparent ages for different water masses along A14. The anthropogenic entry reached maximum in the relatively young and ventilated subantarctic and subtropical domains where AAIW was the most efficient CO2 trap. The calculated annual rate of CANT entry by AAIW was 0.82 μmol kg−1 y−1, in agreement with the annual rate estimated from the equilibrium ... Article in Journal/Newspaper Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Digital.CSIC (Spanish National Research Council) Antarctic Austral Mid-Atlantic Ridge Scripps ENVELOPE(-63.783,-63.783,-69.150,-69.150) Journal of Geophysical Research 108 C4 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
CO2 Anthropogenic carbon Water masses South Atlantic |
spellingShingle |
CO2 Anthropogenic carbon Water masses South Atlantic Ríos, Aida F. Álvarez-Salgado, Xosé Antón Pérez, Fiz F. Bingler, L. S. Arístegui, Javier Mémery, L. Carbon dioxide along WOCE line A14: Water masses characterization and anthropogenic entry |
topic_facet |
CO2 Anthropogenic carbon Water masses South Atlantic |
description |
16 páginas, 12 figuras, 2 tablas The meridional WOCE line A14, just east of the South Atlantic Mid-Atlantic Ridge, was surveyed during the austral summer of 1995 from 4°N to 45°S. Full-depth profiles of pH, total alkalinity (TA), and total inorganic carbon (CT) were measured, allowing a test of the internal consistency of the CO2 system parameters. The correlation between CT measured and calculated from pH and TA was very good (r2 = 0.998), with an insignificant average difference of 0.1 ± 3.0 μmol kg−1 (n = 964 data). CO2 certified reference materials (CRMs) and a collection of selected samples subsequently analyzed at the Scripps Institution of Oceanography were used to assess the accuracy of our measurements at sea with satisfactory results. The three measured CO2 system variables were then used to identify the characteristic array of zonal flows throughout the South Atlantic intersected by A14. Equatorial, subequatorial, subtropical, and subantarctic domains were identified at the depth range of the surface water, South Atlantic Central Water (SACW), Antarctic Intermediate Water (AAIW), Upper Circumpolar Water (UCPW), North Atlantic Deep Water (NADW) and Antarctic Bottom Water (AABW). The nonconservative CO2 system parameters (pH, TA, CT) have been useful in identifying the transition from aged subequatorial to ventilated subtropical surface, central and intermediate waters. They have been identified as good tracers of the zonal circulation of NADW, with marked flows at the equator, 13°S, and 22°S (the “Namib Col Current”) and the sharp transition from UNADW to UCPW at 23°S. The anthropogenic CO2 inventory (CANT) was estimated and compared with CFC-derived apparent ages for different water masses along A14. The anthropogenic entry reached maximum in the relatively young and ventilated subantarctic and subtropical domains where AAIW was the most efficient CO2 trap. The calculated annual rate of CANT entry by AAIW was 0.82 μmol kg−1 y−1, in agreement with the annual rate estimated from the equilibrium ... |
format |
Article in Journal/Newspaper |
author |
Ríos, Aida F. Álvarez-Salgado, Xosé Antón Pérez, Fiz F. Bingler, L. S. Arístegui, Javier Mémery, L. |
author_facet |
Ríos, Aida F. Álvarez-Salgado, Xosé Antón Pérez, Fiz F. Bingler, L. S. Arístegui, Javier Mémery, L. |
author_sort |
Ríos, Aida F. |
title |
Carbon dioxide along WOCE line A14: Water masses characterization and anthropogenic entry |
title_short |
Carbon dioxide along WOCE line A14: Water masses characterization and anthropogenic entry |
title_full |
Carbon dioxide along WOCE line A14: Water masses characterization and anthropogenic entry |
title_fullStr |
Carbon dioxide along WOCE line A14: Water masses characterization and anthropogenic entry |
title_full_unstemmed |
Carbon dioxide along WOCE line A14: Water masses characterization and anthropogenic entry |
title_sort |
carbon dioxide along woce line a14: water masses characterization and anthropogenic entry |
publisher |
American Geophysical Union |
publishDate |
2003 |
url |
http://hdl.handle.net/10261/52194 https://doi.org/10.1029/2000JC000366 |
long_lat |
ENVELOPE(-63.783,-63.783,-69.150,-69.150) |
geographic |
Antarctic Austral Mid-Atlantic Ridge Scripps |
geographic_facet |
Antarctic Austral Mid-Atlantic Ridge Scripps |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
op_relation |
http://dx.doi.org/10.1029/2000JC000366 Journal of Geophysical Research - Part C - Oceans 108: 3123 (2003) 0148-0227 http://hdl.handle.net/10261/52194 doi:10.1029/2000JC000366 2156-2202 |
op_rights |
open |
op_doi |
https://doi.org/10.1029/2000JC000366 |
container_title |
Journal of Geophysical Research |
container_volume |
108 |
container_issue |
C4 |
_version_ |
1790604089213583360 |