Trends in anthropogenic CO2 in water masses of the Subtropical North Atlantic Ocean
The variability in the storage of the oceanic anthropogenic CO2 (Cant) on decadal timescales is evaluated within the main water masses of the Subtropical North Atlantic along 24.5°N. Inorganic carbon measurements on five cruises of the A05 section are used to assess the changes in Cant between 1992...
Published in: | Progress in Oceanography |
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Language: | English |
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2015
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Online Access: | http://nora.nerc.ac.uk/id/eprint/509980/ https://nora.nerc.ac.uk/id/eprint/509980/1/Guallart%20et%20al%20%282015%29%20PiO%20Accepted%20Manuscript.pdf https://doi.org/10.1016/j.pocean.2014.11.006 |
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ftnerc:oai:nora.nerc.ac.uk:509980 2023-05-15T17:06:13+02:00 Trends in anthropogenic CO2 in water masses of the Subtropical North Atlantic Ocean Guallart, Elisa F. Schuster, Ute Fajar, Noelia M. Legge, Oliver Brown, Peter Pelejero, Carles Messias, Marie-Jose Calvo, Eva Watson, Andrew Ríos, Aida F. Pérez, Fiz F. 2015-02 text http://nora.nerc.ac.uk/id/eprint/509980/ https://nora.nerc.ac.uk/id/eprint/509980/1/Guallart%20et%20al%20%282015%29%20PiO%20Accepted%20Manuscript.pdf https://doi.org/10.1016/j.pocean.2014.11.006 en eng https://nora.nerc.ac.uk/id/eprint/509980/1/Guallart%20et%20al%20%282015%29%20PiO%20Accepted%20Manuscript.pdf Guallart, Elisa F.; Schuster, Ute; Fajar, Noelia M.; Legge, Oliver; Brown, Peter orcid:0000-0002-1152-1114 Pelejero, Carles; Messias, Marie-Jose; Calvo, Eva; Watson, Andrew; Ríos, Aida F.; Pérez, Fiz F. 2015 Trends in anthropogenic CO2 in water masses of the Subtropical North Atlantic Ocean. Progress in Oceanography, 131. 21-32. https://doi.org/10.1016/j.pocean.2014.11.006 <https://doi.org/10.1016/j.pocean.2014.11.006> Publication - Article PeerReviewed 2015 ftnerc https://doi.org/10.1016/j.pocean.2014.11.006 2023-02-04T19:41:08Z The variability in the storage of the oceanic anthropogenic CO2 (Cant) on decadal timescales is evaluated within the main water masses of the Subtropical North Atlantic along 24.5°N. Inorganic carbon measurements on five cruises of the A05 section are used to assess the changes in Cant between 1992 and 2011, using four methods (ΔC∗, TrOCA, φCT0, TTD). We find good agreement between the Cant distribution and storage obtained using chlorofluorocarbons and CO2 measurements in both the vertical and horizontal scales. Cant distribution shows higher concentrations and greater decadal storage rates in the upper layers with both values decreasing with depth. The greatest enrichment is obserbed in the central water masses, with their upper limb showing a mean annual accumulation of about 1 μmol kg−1 yr−1 and the lower limb showing, on average, half that value. We detect zonal gradients in the accumulation of Cant. This finding is less clear in the upper waters, where greater variability exists between methods. In accordance with data from time series stations, greater accumulation of Cant is observed in the upper waters of the western basin of the North Atlantic Subtropical Gyre. In intermediate and deep layers, the zonal gradient in the storage of Cant is more robust between methods. The much lower mean storage rates found along the section (<0.25 μmol kg−1 yr−1) become more obvious when longitudinal differences in the Cant accumulation are considered. In particular, west of 70°W the ventilation by the Labrador Sea Water creates a noticeable accumulation rate up to ∼0.5 μmol kg−1 yr−1 between 1000 and 2500 dbar. If a Transient Stationary State of the Cant distributions is considered, significant bi-decadal trends in the Cant storage rates in the deepest North Atlantic waters are detected, in agreement with recent estimations. Article in Journal/Newspaper Labrador Sea North Atlantic Natural Environment Research Council: NERC Open Research Archive Western Basin Progress in Oceanography 131 21 32 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
The variability in the storage of the oceanic anthropogenic CO2 (Cant) on decadal timescales is evaluated within the main water masses of the Subtropical North Atlantic along 24.5°N. Inorganic carbon measurements on five cruises of the A05 section are used to assess the changes in Cant between 1992 and 2011, using four methods (ΔC∗, TrOCA, φCT0, TTD). We find good agreement between the Cant distribution and storage obtained using chlorofluorocarbons and CO2 measurements in both the vertical and horizontal scales. Cant distribution shows higher concentrations and greater decadal storage rates in the upper layers with both values decreasing with depth. The greatest enrichment is obserbed in the central water masses, with their upper limb showing a mean annual accumulation of about 1 μmol kg−1 yr−1 and the lower limb showing, on average, half that value. We detect zonal gradients in the accumulation of Cant. This finding is less clear in the upper waters, where greater variability exists between methods. In accordance with data from time series stations, greater accumulation of Cant is observed in the upper waters of the western basin of the North Atlantic Subtropical Gyre. In intermediate and deep layers, the zonal gradient in the storage of Cant is more robust between methods. The much lower mean storage rates found along the section (<0.25 μmol kg−1 yr−1) become more obvious when longitudinal differences in the Cant accumulation are considered. In particular, west of 70°W the ventilation by the Labrador Sea Water creates a noticeable accumulation rate up to ∼0.5 μmol kg−1 yr−1 between 1000 and 2500 dbar. If a Transient Stationary State of the Cant distributions is considered, significant bi-decadal trends in the Cant storage rates in the deepest North Atlantic waters are detected, in agreement with recent estimations. |
format |
Article in Journal/Newspaper |
author |
Guallart, Elisa F. Schuster, Ute Fajar, Noelia M. Legge, Oliver Brown, Peter Pelejero, Carles Messias, Marie-Jose Calvo, Eva Watson, Andrew Ríos, Aida F. Pérez, Fiz F. |
spellingShingle |
Guallart, Elisa F. Schuster, Ute Fajar, Noelia M. Legge, Oliver Brown, Peter Pelejero, Carles Messias, Marie-Jose Calvo, Eva Watson, Andrew Ríos, Aida F. Pérez, Fiz F. Trends in anthropogenic CO2 in water masses of the Subtropical North Atlantic Ocean |
author_facet |
Guallart, Elisa F. Schuster, Ute Fajar, Noelia M. Legge, Oliver Brown, Peter Pelejero, Carles Messias, Marie-Jose Calvo, Eva Watson, Andrew Ríos, Aida F. Pérez, Fiz F. |
author_sort |
Guallart, Elisa F. |
title |
Trends in anthropogenic CO2 in water masses of the Subtropical North Atlantic Ocean |
title_short |
Trends in anthropogenic CO2 in water masses of the Subtropical North Atlantic Ocean |
title_full |
Trends in anthropogenic CO2 in water masses of the Subtropical North Atlantic Ocean |
title_fullStr |
Trends in anthropogenic CO2 in water masses of the Subtropical North Atlantic Ocean |
title_full_unstemmed |
Trends in anthropogenic CO2 in water masses of the Subtropical North Atlantic Ocean |
title_sort |
trends in anthropogenic co2 in water masses of the subtropical north atlantic ocean |
publishDate |
2015 |
url |
http://nora.nerc.ac.uk/id/eprint/509980/ https://nora.nerc.ac.uk/id/eprint/509980/1/Guallart%20et%20al%20%282015%29%20PiO%20Accepted%20Manuscript.pdf https://doi.org/10.1016/j.pocean.2014.11.006 |
geographic |
Western Basin |
geographic_facet |
Western Basin |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_relation |
https://nora.nerc.ac.uk/id/eprint/509980/1/Guallart%20et%20al%20%282015%29%20PiO%20Accepted%20Manuscript.pdf Guallart, Elisa F.; Schuster, Ute; Fajar, Noelia M.; Legge, Oliver; Brown, Peter orcid:0000-0002-1152-1114 Pelejero, Carles; Messias, Marie-Jose; Calvo, Eva; Watson, Andrew; Ríos, Aida F.; Pérez, Fiz F. 2015 Trends in anthropogenic CO2 in water masses of the Subtropical North Atlantic Ocean. Progress in Oceanography, 131. 21-32. https://doi.org/10.1016/j.pocean.2014.11.006 <https://doi.org/10.1016/j.pocean.2014.11.006> |
op_doi |
https://doi.org/10.1016/j.pocean.2014.11.006 |
container_title |
Progress in Oceanography |
container_volume |
131 |
container_start_page |
21 |
op_container_end_page |
32 |
_version_ |
1766061260049219584 |