The distribution of neodymium isotopes and concentrations in the eastern tropical North Atlantic
Dissolved neodymium (Nd) and its radiogenic isotope composition (143Nd/144Nd, expressed as εNd) belong to the key parameters of the international GEOTRACES program, which aims to investigate the processes controlling the distribution of trace elements and their isotopes in the global ocean. We prese...
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ftoceanrep:oai:oceanrep.geomar.de:44867 2023-05-15T13:40:38+02:00 The distribution of neodymium isotopes and concentrations in the eastern tropical North Atlantic Zieringer, Moritz Frank, Martin Stumpf, Roland Hathorne, Ed C. 2019-04-20 text https://oceanrep.geomar.de/id/eprint/44867/ https://oceanrep.geomar.de/id/eprint/44867/1/10.1016_j.chemgeo.2018.11.024.pdf https://oceanrep.geomar.de/id/eprint/44867/6/Zieringer_et_al_2019.pdf https://doi.org/10.1016/j.chemgeo.2018.11.024 en eng Elsevier https://oceanrep.geomar.de/id/eprint/44867/1/10.1016_j.chemgeo.2018.11.024.pdf https://oceanrep.geomar.de/id/eprint/44867/6/Zieringer_et_al_2019.pdf Zieringer, M., Frank, M. , Stumpf, R. and Hathorne, E. C. (2019) The distribution of neodymium isotopes and concentrations in the eastern tropical North Atlantic. Open Access Chemical Geology, 511 . pp. 265-278. DOI 10.1016/j.chemgeo.2018.11.024 <https://doi.org/10.1016/j.chemgeo.2018.11.024>. doi:10.1016/j.chemgeo.2018.11.024 info:eu-repo/semantics/openAccess Article PeerReviewed 2019 ftoceanrep https://doi.org/10.1016/j.chemgeo.2018.11.024 2023-04-07T15:42:30Z Dissolved neodymium (Nd) and its radiogenic isotope composition (143Nd/144Nd, expressed as εNd) belong to the key parameters of the international GEOTRACES program, which aims to investigate the processes controlling the distribution of trace elements and their isotopes in the global ocean. We present Nd isotope and concentration ([Nd]) data from eleven full depth water column profiles from the eastern (sub)tropical Atlantic Ocean between 2°N and 29°N and from the Romanche Fracture Zone sampled during Meteor cruise M81/1 (GEOTRACES cruise GA11) in February/March 2010. The εNd signatures range from −12.9 in upper North Atlantic Deep Water (UNADW) at the equator to −8.1 in the mixed layer near the Canary Islands. Nd concentrations range from 11.9 pmol/kg observed within the Equatorial Undercurrent to 40.2 pmol/kg in Antarctic Bottom Water (AABW) in the Romanche Fracture Zone. Large variations in surface water Nd isotope compositions (−12.7 ≤ εNd ≤ −8.1) and concentrations (15.7 pmol/kg ≤ [Nd] ≤ 27.7 pmol/kg) are caused by partial dissolution of Saharan dust particles between 2°N and 13°N and volcanic island weathering (Canaries) between 25°N and 29°N. In contrast to dust inputs, which predominantly affect the Nd concentrations and isotope compositions of surface waters and underlying South Atlantic Central Water (SACW), contributions originating from the Canary Islands affect the Nd isotope composition of the entire surrounding water column without significantly altering Nd concentrations, thus confirming the concept of boundary exchange in its strictest sense. The results confirm that the composition of lower North Atlantic Deep Water (LNADW, εNd = −12.1) in the abyssal plains of the eastern North Atlantic is exclusively set by the mixing ratio of LNADW and Antarctic Bottom Water (AABW). Upper North Atlantic Deep Water (UNADW), in contrast, is characterized by εNd signatures between −12.7 and − 12.0 between 2°N and 10°N, whereas further north it is clearly affected by admixture of Mediterranean Water (MW) and ... Article in Journal/Newspaper Antarc* Antarctic North Atlantic Deep Water North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Chemical Geology 511 265 278 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Dissolved neodymium (Nd) and its radiogenic isotope composition (143Nd/144Nd, expressed as εNd) belong to the key parameters of the international GEOTRACES program, which aims to investigate the processes controlling the distribution of trace elements and their isotopes in the global ocean. We present Nd isotope and concentration ([Nd]) data from eleven full depth water column profiles from the eastern (sub)tropical Atlantic Ocean between 2°N and 29°N and from the Romanche Fracture Zone sampled during Meteor cruise M81/1 (GEOTRACES cruise GA11) in February/March 2010. The εNd signatures range from −12.9 in upper North Atlantic Deep Water (UNADW) at the equator to −8.1 in the mixed layer near the Canary Islands. Nd concentrations range from 11.9 pmol/kg observed within the Equatorial Undercurrent to 40.2 pmol/kg in Antarctic Bottom Water (AABW) in the Romanche Fracture Zone. Large variations in surface water Nd isotope compositions (−12.7 ≤ εNd ≤ −8.1) and concentrations (15.7 pmol/kg ≤ [Nd] ≤ 27.7 pmol/kg) are caused by partial dissolution of Saharan dust particles between 2°N and 13°N and volcanic island weathering (Canaries) between 25°N and 29°N. In contrast to dust inputs, which predominantly affect the Nd concentrations and isotope compositions of surface waters and underlying South Atlantic Central Water (SACW), contributions originating from the Canary Islands affect the Nd isotope composition of the entire surrounding water column without significantly altering Nd concentrations, thus confirming the concept of boundary exchange in its strictest sense. The results confirm that the composition of lower North Atlantic Deep Water (LNADW, εNd = −12.1) in the abyssal plains of the eastern North Atlantic is exclusively set by the mixing ratio of LNADW and Antarctic Bottom Water (AABW). Upper North Atlantic Deep Water (UNADW), in contrast, is characterized by εNd signatures between −12.7 and − 12.0 between 2°N and 10°N, whereas further north it is clearly affected by admixture of Mediterranean Water (MW) and ... |
format |
Article in Journal/Newspaper |
author |
Zieringer, Moritz Frank, Martin Stumpf, Roland Hathorne, Ed C. |
spellingShingle |
Zieringer, Moritz Frank, Martin Stumpf, Roland Hathorne, Ed C. The distribution of neodymium isotopes and concentrations in the eastern tropical North Atlantic |
author_facet |
Zieringer, Moritz Frank, Martin Stumpf, Roland Hathorne, Ed C. |
author_sort |
Zieringer, Moritz |
title |
The distribution of neodymium isotopes and concentrations in the eastern tropical North Atlantic |
title_short |
The distribution of neodymium isotopes and concentrations in the eastern tropical North Atlantic |
title_full |
The distribution of neodymium isotopes and concentrations in the eastern tropical North Atlantic |
title_fullStr |
The distribution of neodymium isotopes and concentrations in the eastern tropical North Atlantic |
title_full_unstemmed |
The distribution of neodymium isotopes and concentrations in the eastern tropical North Atlantic |
title_sort |
distribution of neodymium isotopes and concentrations in the eastern tropical north atlantic |
publisher |
Elsevier |
publishDate |
2019 |
url |
https://oceanrep.geomar.de/id/eprint/44867/ https://oceanrep.geomar.de/id/eprint/44867/1/10.1016_j.chemgeo.2018.11.024.pdf https://oceanrep.geomar.de/id/eprint/44867/6/Zieringer_et_al_2019.pdf https://doi.org/10.1016/j.chemgeo.2018.11.024 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/44867/1/10.1016_j.chemgeo.2018.11.024.pdf https://oceanrep.geomar.de/id/eprint/44867/6/Zieringer_et_al_2019.pdf Zieringer, M., Frank, M. , Stumpf, R. and Hathorne, E. C. (2019) The distribution of neodymium isotopes and concentrations in the eastern tropical North Atlantic. Open Access Chemical Geology, 511 . pp. 265-278. DOI 10.1016/j.chemgeo.2018.11.024 <https://doi.org/10.1016/j.chemgeo.2018.11.024>. doi:10.1016/j.chemgeo.2018.11.024 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.chemgeo.2018.11.024 |
container_title |
Chemical Geology |
container_volume |
511 |
container_start_page |
265 |
op_container_end_page |
278 |
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1766137891889610752 |