Tracing water masses with 129I and 236U in the subpolar North Atlantic along the GEOTRACES GA01 section
20 pages, 6 figures, 1 table.-- This work is distributed under the Creative Commons Attribution 4.0 License Pathways and timescales of water mass transport in the subpolar North Atlantic Ocean (SPNA) have been investigated by many studies due to their importance for the meridional overturning circul...
Published in: | Biogeosciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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European Geosciences Union
2018
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Online Access: | http://hdl.handle.net/10261/170909 https://doi.org/10.5194/bg-15-5545-2018 https://doi.org/10.13039/501100003329 |
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ftcsic:oai:digital.csic.es:10261/170909 2024-02-11T10:03:27+01:00 Tracing water masses with 129I and 236U in the subpolar North Atlantic along the GEOTRACES GA01 section Castrillejo, Maxi Casacuberta, Nuria Christl, M. Vockenhuber, Christof Synal, Hans-Arno García-Ibáñez, Maribel I. Lherminier, Pascale Sarthou, G. García-Orellana, Jordi Masqué, Pere Ministerio de Economía y Competitividad (España) 2018 http://hdl.handle.net/10261/170909 https://doi.org/10.5194/bg-15-5545-2018 https://doi.org/10.13039/501100003329 en eng European Geosciences Union #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2013-41048-P Publisher's version https://doi.org/10.5194/bg-15-5545-2018 Sí Biogeosciences 15(18): 5545–5564 (2018) 1726-4170 http://hdl.handle.net/10261/170909 doi:10.5194/bg-15-5545-2018 1726-4189 http://dx.doi.org/10.13039/501100003329 open artículo http://purl.org/coar/resource_type/c_6501 2018 ftcsic https://doi.org/10.5194/bg-15-5545-201810.13039/501100003329 2024-01-16T10:33:25Z 20 pages, 6 figures, 1 table.-- This work is distributed under the Creative Commons Attribution 4.0 License Pathways and timescales of water mass transport in the subpolar North Atlantic Ocean (SPNA) have been investigated by many studies due to their importance for the meridional overturning circulation and thus for the global ocean. In this sense, observational data on geochemical tracers provide complementary information to improve the current understanding of the circulation in the SPNA. To this end, we present the first simultaneous distribution of artificial 129I and 236U in 14 depth profiles and in surface waters along the GEOVIDE section covering a zonal transect through the SPNA in spring 2014. Our results show that the two tracers are distributed following the water mass structure and that their presence is largely influenced by the global fallout (GF) and liquid effluents discharged to north-western European coastal waters by the Sellafield and La Hague nuclear reprocessing plants (NRPs). As a result, 129I concentrations and 236U∕238U atom ratios and 129I∕236U atom ratios display a wide range of values: (0.2–256) × 107atkg−1 (40–2350) × 10−12 and 0.5–200, respectively. The signal from NRPs, which is characterised by higher 129I concentrations and 129I∕236U atom ratios compared to GF, is transported by Atlantic Waters (AWs) into the SPNA, notably by the East Greenland Current (EGC)/Labrador Current (LC) at the surface and by waters overflowing the Greenland–Scotland passage at greater depths. Nevertheless, our results show that the effluents from NRPs may also directly enter the surface of the eastern SPNA through the Iceland–Scotland passage or the English Channel/Irish Sea. The use of the 236U∕238U and 129I∕236U dual tracer approach further serves to discern Polar Intermediate Water (PIW) of Canadian origin from that of Atlantic origin, which carries comparably higher tracer levels due to NRPs (particularly 129I). The cascading of these waters appears to modify the water mass composition in the ... Article in Journal/Newspaper East Greenland east greenland current Greenland Iceland North Atlantic Digital.CSIC (Spanish National Research Council) Greenland Biogeosciences 15 18 5545 5564 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
description |
20 pages, 6 figures, 1 table.-- This work is distributed under the Creative Commons Attribution 4.0 License Pathways and timescales of water mass transport in the subpolar North Atlantic Ocean (SPNA) have been investigated by many studies due to their importance for the meridional overturning circulation and thus for the global ocean. In this sense, observational data on geochemical tracers provide complementary information to improve the current understanding of the circulation in the SPNA. To this end, we present the first simultaneous distribution of artificial 129I and 236U in 14 depth profiles and in surface waters along the GEOVIDE section covering a zonal transect through the SPNA in spring 2014. Our results show that the two tracers are distributed following the water mass structure and that their presence is largely influenced by the global fallout (GF) and liquid effluents discharged to north-western European coastal waters by the Sellafield and La Hague nuclear reprocessing plants (NRPs). As a result, 129I concentrations and 236U∕238U atom ratios and 129I∕236U atom ratios display a wide range of values: (0.2–256) × 107atkg−1 (40–2350) × 10−12 and 0.5–200, respectively. The signal from NRPs, which is characterised by higher 129I concentrations and 129I∕236U atom ratios compared to GF, is transported by Atlantic Waters (AWs) into the SPNA, notably by the East Greenland Current (EGC)/Labrador Current (LC) at the surface and by waters overflowing the Greenland–Scotland passage at greater depths. Nevertheless, our results show that the effluents from NRPs may also directly enter the surface of the eastern SPNA through the Iceland–Scotland passage or the English Channel/Irish Sea. The use of the 236U∕238U and 129I∕236U dual tracer approach further serves to discern Polar Intermediate Water (PIW) of Canadian origin from that of Atlantic origin, which carries comparably higher tracer levels due to NRPs (particularly 129I). The cascading of these waters appears to modify the water mass composition in the ... |
author2 |
Ministerio de Economía y Competitividad (España) |
format |
Article in Journal/Newspaper |
author |
Castrillejo, Maxi Casacuberta, Nuria Christl, M. Vockenhuber, Christof Synal, Hans-Arno García-Ibáñez, Maribel I. Lherminier, Pascale Sarthou, G. García-Orellana, Jordi Masqué, Pere |
spellingShingle |
Castrillejo, Maxi Casacuberta, Nuria Christl, M. Vockenhuber, Christof Synal, Hans-Arno García-Ibáñez, Maribel I. Lherminier, Pascale Sarthou, G. García-Orellana, Jordi Masqué, Pere Tracing water masses with 129I and 236U in the subpolar North Atlantic along the GEOTRACES GA01 section |
author_facet |
Castrillejo, Maxi Casacuberta, Nuria Christl, M. Vockenhuber, Christof Synal, Hans-Arno García-Ibáñez, Maribel I. Lherminier, Pascale Sarthou, G. García-Orellana, Jordi Masqué, Pere |
author_sort |
Castrillejo, Maxi |
title |
Tracing water masses with 129I and 236U in the subpolar North Atlantic along the GEOTRACES GA01 section |
title_short |
Tracing water masses with 129I and 236U in the subpolar North Atlantic along the GEOTRACES GA01 section |
title_full |
Tracing water masses with 129I and 236U in the subpolar North Atlantic along the GEOTRACES GA01 section |
title_fullStr |
Tracing water masses with 129I and 236U in the subpolar North Atlantic along the GEOTRACES GA01 section |
title_full_unstemmed |
Tracing water masses with 129I and 236U in the subpolar North Atlantic along the GEOTRACES GA01 section |
title_sort |
tracing water masses with 129i and 236u in the subpolar north atlantic along the geotraces ga01 section |
publisher |
European Geosciences Union |
publishDate |
2018 |
url |
http://hdl.handle.net/10261/170909 https://doi.org/10.5194/bg-15-5545-2018 https://doi.org/10.13039/501100003329 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland east greenland current Greenland Iceland North Atlantic |
genre_facet |
East Greenland east greenland current Greenland Iceland North Atlantic |
op_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2013-41048-P Publisher's version https://doi.org/10.5194/bg-15-5545-2018 Sí Biogeosciences 15(18): 5545–5564 (2018) 1726-4170 http://hdl.handle.net/10261/170909 doi:10.5194/bg-15-5545-2018 1726-4189 http://dx.doi.org/10.13039/501100003329 |
op_rights |
open |
op_doi |
https://doi.org/10.5194/bg-15-5545-201810.13039/501100003329 |
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Biogeosciences |
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15 |
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18 |
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5545 |
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5564 |
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