Temporal changes in ventilation and the carbonate system in the Atlantic sector of the Southern Ocean
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 cons...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Language: | English |
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Online Access: | https://oceanrep.geomar.de/id/eprint/34825/ https://oceanrep.geomar.de/id/eprint/34825/1/1-s2.0-S0967064516303046-main.pdf https://doi.org/10.1016/j.dsr2.2016.10.004 |
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ftoceanrep:oai:oceanrep.geomar.de:34825 2023-05-15T14:08:10+02:00 Temporal changes in ventilation and the carbonate system in the Atlantic sector of the Southern Ocean Tanhua, Toste Hoppema, Mario Jones, Elizabeth M. Stöven, Tim Hauck, Judith Davila, Melchor González Santana-Casiano, Magdalena Alvarez, Marta Strass, Volker H. 2017-04 text https://oceanrep.geomar.de/id/eprint/34825/ https://oceanrep.geomar.de/id/eprint/34825/1/1-s2.0-S0967064516303046-main.pdf https://doi.org/10.1016/j.dsr2.2016.10.004 en eng Elsevier https://oceanrep.geomar.de/id/eprint/34825/1/1-s2.0-S0967064516303046-main.pdf Tanhua, T. , Hoppema, M., Jones, E. M., Stöven, T. , Hauck, J., Davila, M. G., Santana-Casiano, M., Alvarez, M. and Strass, V. H. (2017) Temporal changes in ventilation and the carbonate system in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 138 . pp. 26-38. DOI 10.1016/j.dsr2.2016.10.004 <https://doi.org/10.1016/j.dsr2.2016.10.004>. doi:10.1016/j.dsr2.2016.10.004 info:eu-repo/semantics/restrictedAccess Article PeerReviewed info:eu-repo/semantics/article 2017 ftoceanrep https://doi.org/10.1016/j.dsr2.2016.10.004 2023-04-07T15:29:17Z 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 ocean ... Article in Journal/Newspaper Antarc* Antarctic North Atlantic Southern Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Southern Ocean The Antarctic Deep Sea Research Part II: Topical Studies in Oceanography 138 26 38 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
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 ocean ... |
format |
Article in Journal/Newspaper |
author |
Tanhua, Toste Hoppema, Mario Jones, Elizabeth M. Stöven, Tim Hauck, Judith Davila, Melchor González Santana-Casiano, Magdalena Alvarez, Marta Strass, Volker H. |
spellingShingle |
Tanhua, Toste Hoppema, Mario Jones, Elizabeth M. Stöven, Tim Hauck, Judith Davila, Melchor González Santana-Casiano, Magdalena Alvarez, Marta Strass, Volker H. Temporal changes in ventilation and the carbonate system in the Atlantic sector of the Southern Ocean |
author_facet |
Tanhua, Toste Hoppema, Mario Jones, Elizabeth M. Stöven, Tim Hauck, Judith Davila, Melchor González Santana-Casiano, Magdalena Alvarez, Marta Strass, Volker H. |
author_sort |
Tanhua, 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 |
Elsevier |
publishDate |
2017 |
url |
https://oceanrep.geomar.de/id/eprint/34825/ https://oceanrep.geomar.de/id/eprint/34825/1/1-s2.0-S0967064516303046-main.pdf https://doi.org/10.1016/j.dsr2.2016.10.004 |
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://oceanrep.geomar.de/id/eprint/34825/1/1-s2.0-S0967064516303046-main.pdf Tanhua, T. , Hoppema, M., Jones, E. M., Stöven, T. , Hauck, J., Davila, M. G., Santana-Casiano, M., Alvarez, M. and Strass, V. H. (2017) Temporal changes in ventilation and the carbonate system in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 138 . pp. 26-38. DOI 10.1016/j.dsr2.2016.10.004 <https://doi.org/10.1016/j.dsr2.2016.10.004>. doi:10.1016/j.dsr2.2016.10.004 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
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 |
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1766280202858528768 |