A first transect of 236U in the North Atlantic Ocean
In this study the first comprehensive dataset of 236U in the North Atlantic Ocean is presented. 236U/238U ratios and 236U concentrations are determined in about 70 seawater samples collected from 9 depth profiles along a transect through the Northwest Atlantic Ocean during the first two legs of the...
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ftawi:oai:epic.awi.de:34932 2024-09-15T18:19:01+00:00 A first transect of 236U in the North Atlantic Ocean Casacuberta, Nuria Christl, Marcus Lachner, Johannes Rutgers v. d. Loeff, Michiel Masque, Pere Synal, Hans-Arno 2014-05-15 https://epic.awi.de/id/eprint/34932/ https://hdl.handle.net/10013/epic.43308 unknown PERGAMON-ELSEVIER SCIENCE LTD Casacuberta, N. , Christl, M. , Lachner, J. , Rutgers v. d. Loeff, M. orcid:0000-0003-1393-3742 , Masque, P. and Synal, H. A. (2014) A first transect of 236U in the North Atlantic Ocean , Geochimica et Cosmochimica Acta, 133 , pp. 34-46 . doi:10.1016/j.gca.2014.02.012 <https://doi.org/10.1016/j.gca.2014.02.012> , hdl:10013/epic.43308 EPIC3Geochimica et Cosmochimica Acta, PERGAMON-ELSEVIER SCIENCE LTD, 133, pp. 34-46, ISSN: 0016-7037 Article isiRev 2014 ftawi https://doi.org/10.1016/j.gca.2014.02.012 2024-06-24T04:08:32Z In this study the first comprehensive dataset of 236U in the North Atlantic Ocean is presented. 236U/238U ratios and 236U concentrations are determined in about 70 seawater samples collected from 9 depth profiles along a transect through the Northwest Atlantic Ocean during the first two legs of the GEOTRACES cruise GA02 in 2010. The cruise track was designed to follow the path of the North Atlantic Deep Water (NADW) from its formation region to the deep parts of the western Atlantic Ocean basins. Our results show that there is a strong North to South and surface to deep ocean gradient spanning a broad range of 236U/238U, from (44±15)x10-12 to (1477±91)x10-12 that correlates well with the distribution of water masses in this region. All measured ratios are above the theoretical pre-anthropogenic levels of 10-13 to 10-14, showing that the whole transect is dominated by anthropogenic 236U. Based on the calculated 236U inventories the 236U inputs of global fallout and direct releases from nuclear reprocessing plants could be constrained to a range from 1000 to 1400 kg and from 115 to 250 kg of 236U, from the two sources, respectively. Our results show that the 236U/238U atomic ratio can be used as a marker of North Atlantic water masses: with high ratios (> 1000x10-12) characterizing northern water masses (LSW and DSOW); and lowest ratios (50-400 x10-12) corresponding to the increasing influence of AABW and AAIW. Article in Journal/Newspaper NADW North Atlantic Deep Water North Atlantic Northwest Atlantic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Geochimica et Cosmochimica Acta 133 34 46 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
In this study the first comprehensive dataset of 236U in the North Atlantic Ocean is presented. 236U/238U ratios and 236U concentrations are determined in about 70 seawater samples collected from 9 depth profiles along a transect through the Northwest Atlantic Ocean during the first two legs of the GEOTRACES cruise GA02 in 2010. The cruise track was designed to follow the path of the North Atlantic Deep Water (NADW) from its formation region to the deep parts of the western Atlantic Ocean basins. Our results show that there is a strong North to South and surface to deep ocean gradient spanning a broad range of 236U/238U, from (44±15)x10-12 to (1477±91)x10-12 that correlates well with the distribution of water masses in this region. All measured ratios are above the theoretical pre-anthropogenic levels of 10-13 to 10-14, showing that the whole transect is dominated by anthropogenic 236U. Based on the calculated 236U inventories the 236U inputs of global fallout and direct releases from nuclear reprocessing plants could be constrained to a range from 1000 to 1400 kg and from 115 to 250 kg of 236U, from the two sources, respectively. Our results show that the 236U/238U atomic ratio can be used as a marker of North Atlantic water masses: with high ratios (> 1000x10-12) characterizing northern water masses (LSW and DSOW); and lowest ratios (50-400 x10-12) corresponding to the increasing influence of AABW and AAIW. |
format |
Article in Journal/Newspaper |
author |
Casacuberta, Nuria Christl, Marcus Lachner, Johannes Rutgers v. d. Loeff, Michiel Masque, Pere Synal, Hans-Arno |
spellingShingle |
Casacuberta, Nuria Christl, Marcus Lachner, Johannes Rutgers v. d. Loeff, Michiel Masque, Pere Synal, Hans-Arno A first transect of 236U in the North Atlantic Ocean |
author_facet |
Casacuberta, Nuria Christl, Marcus Lachner, Johannes Rutgers v. d. Loeff, Michiel Masque, Pere Synal, Hans-Arno |
author_sort |
Casacuberta, Nuria |
title |
A first transect of 236U in the North Atlantic Ocean |
title_short |
A first transect of 236U in the North Atlantic Ocean |
title_full |
A first transect of 236U in the North Atlantic Ocean |
title_fullStr |
A first transect of 236U in the North Atlantic Ocean |
title_full_unstemmed |
A first transect of 236U in the North Atlantic Ocean |
title_sort |
first transect of 236u in the north atlantic ocean |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2014 |
url |
https://epic.awi.de/id/eprint/34932/ https://hdl.handle.net/10013/epic.43308 |
genre |
NADW North Atlantic Deep Water North Atlantic Northwest Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic Northwest Atlantic |
op_source |
EPIC3Geochimica et Cosmochimica Acta, PERGAMON-ELSEVIER SCIENCE LTD, 133, pp. 34-46, ISSN: 0016-7037 |
op_relation |
Casacuberta, N. , Christl, M. , Lachner, J. , Rutgers v. d. Loeff, M. orcid:0000-0003-1393-3742 , Masque, P. and Synal, H. A. (2014) A first transect of 236U in the North Atlantic Ocean , Geochimica et Cosmochimica Acta, 133 , pp. 34-46 . doi:10.1016/j.gca.2014.02.012 <https://doi.org/10.1016/j.gca.2014.02.012> , hdl:10013/epic.43308 |
op_doi |
https://doi.org/10.1016/j.gca.2014.02.012 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
133 |
container_start_page |
34 |
op_container_end_page |
46 |
_version_ |
1810457121510129664 |