Temporal changes in ventilation and the carbonate system in the Atlantic sector of the Southern Ocean
Article The Southern Ocean is the most important area of anthropogenic carbon (Cant) uptake in the world ocean, only rivalled in importance by the North Atlantic Ocean. Significant variability on decadal time-scales in the uptake of Cant in the Southern Ocean has been observed and modelled, likely w...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Centro Oceanográfico de A Coruña
2017
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Online Access: | http://hdl.handle.net/10508/11339 https://doi.org/10.1016/j.dsr2.2016.10.004 |
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ftieo:oai:repositorio.ieo.es:10508/11339 2023-05-15T13:41:24+02:00 Temporal changes in ventilation and the carbonate system in the Atlantic sector of the Southern Ocean Tanhua, T. (Toste) Hoppema, M. (Mario) Jones, E. M. (Elizabeth M.) Stöven, T. (Tim) Hauck, J. (Judith) González-Dávila, M. (Melchor) Santana-Casiano, J.M (Juana Magdalena) Álvarez, M. (Marta) Strass, V.H. (Volker H.) 2012 and 2016 Atlántico Sur Océano Atlántico Océan atlantique South Atlantic Atlantic Ocean Atlantique Sud 2017-04 http://hdl.handle.net/10508/11339 https://doi.org/10.1016/j.dsr2.2016.10.004 eng eng Centro Oceanográfico de A Coruña https://www.sciencedirect.com/science/article/pii/S0967064516303046 ANT-XXVIII/3 (2012) and GLODA Pv2 http://hdl.handle.net/10508/11339 Deep-Sea Research II, 138. 2017: 26-38 doi:10.1016/j.dsr2.2016.10.004 Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess CC-BY-NC-ND Tracers Carbon cycle Southern ocean carbon ventilation energy Anthropogenic effects Chemical oceanography article 2017 ftieo https://doi.org/10.1016/j.dsr2.2016.10.004 2022-07-26T23:49:08Z Article The Southern Ocean is the most important area of anthropogenic carbon (Cant) uptake in the world ocean, only rivalled in importance by the North Atlantic Ocean. Significant variability on decadal time-scales in the uptake of Cant in the Southern Ocean has been observed and modelled, likely with consequences for the interior ocean storage of Cant in the region, and implications for the global carbon budget. Here we use eight cruises between 1973 and 2012 to assess decadal variability in Cant storage rates in the southeast Atlantic sector of the Southern Ocean. For this we employed the extended multiple linear regression (eMLR) method. We relate variability in DIC (dissolved inorganic carbon) storage, which is assumed to equal anthropogenic carbon storage, to changes in ventilation as observed from repeat measurements of transient tracers. Within the Antarctic Intermediate Water (AAIW) layer, which is the dominant transport conduit for Cant into the interior ocean, moderate Cant storage rates were found without any clear temporal trend. In Subantarctic Mode Water (SAMW), a less dense water mass found north of the Subantarctic Front and above AAIW, high storage rates of Cant were observed up to about 2005 but lower rates in more recent times. The transient tracer data suggest a significant speed-up of ventilation in the summer warmed upper part of AAIW between 1998 and 2012, which is consistent with the high storage rate of Cant. A shift of more northern Cant storage to more southern storage in near surface waters was detected in the early 2000s. Beneath the AAIW the eMLR method as applied here did not detect significant storage of Cant. However, the presence of the transient tracer CFC-12 all through the water column suggests that some Cant should be present, but at concentrations not reliably quantifiable. The observed temporal variability in the interior ocean seems at a first glance to be out of phase with observed surface ocean Cant fluxes, but this can be explained by the time delay for the surface ... Article in Journal/Newspaper Antarc* Antarctic North Atlantic Southern Ocean Instituto Español de Oceanografía: e-IEO Antarctic Southern Ocean The Antarctic Deep Sea Research Part II: Topical Studies in Oceanography 138 26 38 |
institution |
Open Polar |
collection |
Instituto Español de Oceanografía: e-IEO |
op_collection_id |
ftieo |
language |
English |
topic |
Tracers Carbon cycle Southern ocean carbon ventilation energy Anthropogenic effects Chemical oceanography |
spellingShingle |
Tracers Carbon cycle Southern ocean carbon ventilation energy Anthropogenic effects Chemical oceanography Tanhua, T. (Toste) Hoppema, M. (Mario) Jones, E. M. (Elizabeth M.) Stöven, T. (Tim) Hauck, J. (Judith) González-Dávila, M. (Melchor) Santana-Casiano, J.M (Juana Magdalena) Álvarez, M. (Marta) Strass, V.H. (Volker H.) Temporal changes in ventilation and the carbonate system in the Atlantic sector of the Southern Ocean |
topic_facet |
Tracers Carbon cycle Southern ocean carbon ventilation energy Anthropogenic effects Chemical oceanography |
description |
Article The Southern Ocean is the most important area of anthropogenic carbon (Cant) uptake in the world ocean, only rivalled in importance by the North Atlantic Ocean. Significant variability on decadal time-scales in the uptake of Cant in the Southern Ocean has been observed and modelled, likely with consequences for the interior ocean storage of Cant in the region, and implications for the global carbon budget. Here we use eight cruises between 1973 and 2012 to assess decadal variability in Cant storage rates in the southeast Atlantic sector of the Southern Ocean. For this we employed the extended multiple linear regression (eMLR) method. We relate variability in DIC (dissolved inorganic carbon) storage, which is assumed to equal anthropogenic carbon storage, to changes in ventilation as observed from repeat measurements of transient tracers. Within the Antarctic Intermediate Water (AAIW) layer, which is the dominant transport conduit for Cant into the interior ocean, moderate Cant storage rates were found without any clear temporal trend. In Subantarctic Mode Water (SAMW), a less dense water mass found north of the Subantarctic Front and above AAIW, high storage rates of Cant were observed up to about 2005 but lower rates in more recent times. The transient tracer data suggest a significant speed-up of ventilation in the summer warmed upper part of AAIW between 1998 and 2012, which is consistent with the high storage rate of Cant. A shift of more northern Cant storage to more southern storage in near surface waters was detected in the early 2000s. Beneath the AAIW the eMLR method as applied here did not detect significant storage of Cant. However, the presence of the transient tracer CFC-12 all through the water column suggests that some Cant should be present, but at concentrations not reliably quantifiable. The observed temporal variability in the interior ocean seems at a first glance to be out of phase with observed surface ocean Cant fluxes, but this can be explained by the time delay for the surface ... |
format |
Article in Journal/Newspaper |
author |
Tanhua, T. (Toste) Hoppema, M. (Mario) Jones, E. M. (Elizabeth M.) Stöven, T. (Tim) Hauck, J. (Judith) González-Dávila, M. (Melchor) Santana-Casiano, J.M (Juana Magdalena) Álvarez, M. (Marta) Strass, V.H. (Volker H.) |
author_facet |
Tanhua, T. (Toste) Hoppema, M. (Mario) Jones, E. M. (Elizabeth M.) Stöven, T. (Tim) Hauck, J. (Judith) González-Dávila, M. (Melchor) Santana-Casiano, J.M (Juana Magdalena) Álvarez, M. (Marta) Strass, V.H. (Volker H.) |
author_sort |
Tanhua, T. (Toste) |
title |
Temporal changes in ventilation and the carbonate system in the Atlantic sector of the Southern Ocean |
title_short |
Temporal changes in ventilation and the carbonate system in the Atlantic sector of the Southern Ocean |
title_full |
Temporal changes in ventilation and the carbonate system in the Atlantic sector of the Southern Ocean |
title_fullStr |
Temporal changes in ventilation and the carbonate system in the Atlantic sector of the Southern Ocean |
title_full_unstemmed |
Temporal changes in ventilation and the carbonate system in the Atlantic sector of the Southern Ocean |
title_sort |
temporal changes in ventilation and the carbonate system in the atlantic sector of the southern ocean |
publisher |
Centro Oceanográfico de A Coruña |
publishDate |
2017 |
url |
http://hdl.handle.net/10508/11339 https://doi.org/10.1016/j.dsr2.2016.10.004 |
op_coverage |
2012 and 2016 Atlántico Sur Océano Atlántico Océan atlantique South Atlantic Atlantic Ocean Atlantique Sud |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic North Atlantic Southern Ocean |
op_relation |
https://www.sciencedirect.com/science/article/pii/S0967064516303046 ANT-XXVIII/3 (2012) and GLODA Pv2 http://hdl.handle.net/10508/11339 Deep-Sea Research II, 138. 2017: 26-38 doi:10.1016/j.dsr2.2016.10.004 |
op_rights |
Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.dsr2.2016.10.004 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
138 |
container_start_page |
26 |
op_container_end_page |
38 |
_version_ |
1766150549864972288 |