Acquisition of the neodymium isotopic composition of the North Atlantic Deep Water
The North Atlantic Deep Water (NADW) neodymium isotopic composition (Nd IC) is increasingly used in oceanography and paleoceanography to trace large-scale circulation and weathering processes, notably to investigate past variations of the global thermohaline circulation. Although the present-day NAD...
Published in: | Geochemistry, Geophysics, Geosystems |
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Main Authors: | , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2005
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-00280188 https://hal.archives-ouvertes.fr/hal-00280188/document https://hal.archives-ouvertes.fr/hal-00280188/file/2005GC000956.pdf https://doi.org/10.1029/2005GC000956 |
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ftccsdartic:oai:HAL:hal-00280188v1 |
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openpolar |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
boundary exchange neodymium isotopic composition North Atlantic Deep Water rare earth elements sediment seawater interaction [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
boundary exchange neodymium isotopic composition North Atlantic Deep Water rare earth elements sediment seawater interaction [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Lacan, F. Jeandel, C. Acquisition of the neodymium isotopic composition of the North Atlantic Deep Water |
topic_facet |
boundary exchange neodymium isotopic composition North Atlantic Deep Water rare earth elements sediment seawater interaction [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
The North Atlantic Deep Water (NADW) neodymium isotopic composition (Nd IC) is increasingly used in oceanography and paleoceanography to trace large-scale circulation and weathering processes, notably to investigate past variations of the global thermohaline circulation. Although the present-day NADW Nd IC is well characterized at e Nd = À13.5, the acquisition of this isotopic signature (in other words, the causes of this value) has so far been very sparsely documented. Such an understanding is, however, fundamental to the interpretation of paleo records. Nd IC and rare earth element concentrations were measured at 9 stations within the North Atlantic Subpolar Gyre (SIGNATURE cruise, summer 1999). The comparison of this data set with our understanding of water mass circulation provides a description of how the three layers constituting the NADW, the Labrador Sea Water (LSW, e Nd = À13.9 ± 0.4), North East Atlantic Deep Water (NEADW, e Nd À13.2 ± 0.4), and North West Atlantic Bottom Water (NWABW, e Nd À14.5 ± 0.4), acquire their Nd IC through distinct water mass mixings and lithogenic inputs. These different mechanisms, acting upon water masses from very diverse sources, seem to bring the Nd IC of the three NADW layers to values close together and similar to that of the NADW. It is suggested that sediment/seawater interactions significantly lower the NEADW and NWABW Nd IC along the South East Greenland margin. Since these interactions do not significantly modify the Nd content of these water masses, sediment remobilizations leading to the Nd IC variations are probably associated with Nd removal fluxes from the water mass toward the sediment, a process called boundary exchange. On the other hand, LSW seems to acquire its Nd IC from the Subpolar Mode Waters from which it is formed by deep convection, and no other mechanism needs to be invoked. Its unradiogenic signature could ultimately be linked to fresh water runoff from the Canadian Shield. These conclusions should allow more precise interpretations of ... |
author2 |
GEOMAR LEGOS Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Lacan, F. Jeandel, C. |
author_facet |
Lacan, F. Jeandel, C. |
author_sort |
Lacan, F. |
title |
Acquisition of the neodymium isotopic composition of the North Atlantic Deep Water |
title_short |
Acquisition of the neodymium isotopic composition of the North Atlantic Deep Water |
title_full |
Acquisition of the neodymium isotopic composition of the North Atlantic Deep Water |
title_fullStr |
Acquisition of the neodymium isotopic composition of the North Atlantic Deep Water |
title_full_unstemmed |
Acquisition of the neodymium isotopic composition of the North Atlantic Deep Water |
title_sort |
acquisition of the neodymium isotopic composition of the north atlantic deep water |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.archives-ouvertes.fr/hal-00280188 https://hal.archives-ouvertes.fr/hal-00280188/document https://hal.archives-ouvertes.fr/hal-00280188/file/2005GC000956.pdf https://doi.org/10.1029/2005GC000956 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Greenland Labrador Sea NADW North Atlantic Deep Water North Atlantic North East Atlantic North West Atlantic |
genre_facet |
East Greenland Greenland Labrador Sea NADW North Atlantic Deep Water North Atlantic North East Atlantic North West Atlantic |
op_source |
ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.archives-ouvertes.fr/hal-00280188 Geochemistry, Geophysics, Geosystems, AGU and the Geochemical Society, 2005, 6, pp.Q12008. ⟨10.1029/2005GC000956⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2005GC000956 hal-00280188 https://hal.archives-ouvertes.fr/hal-00280188 https://hal.archives-ouvertes.fr/hal-00280188/document https://hal.archives-ouvertes.fr/hal-00280188/file/2005GC000956.pdf doi:10.1029/2005GC000956 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2005GC000956 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
6 |
container_issue |
12 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1766399627464015872 |
spelling |
ftccsdartic:oai:HAL:hal-00280188v1 2023-05-15T16:03:56+02:00 Acquisition of the neodymium isotopic composition of the North Atlantic Deep Water Lacan, F. Jeandel, C. GEOMAR LEGOS Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) 2005 https://hal.archives-ouvertes.fr/hal-00280188 https://hal.archives-ouvertes.fr/hal-00280188/document https://hal.archives-ouvertes.fr/hal-00280188/file/2005GC000956.pdf https://doi.org/10.1029/2005GC000956 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1029/2005GC000956 hal-00280188 https://hal.archives-ouvertes.fr/hal-00280188 https://hal.archives-ouvertes.fr/hal-00280188/document https://hal.archives-ouvertes.fr/hal-00280188/file/2005GC000956.pdf doi:10.1029/2005GC000956 info:eu-repo/semantics/OpenAccess ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.archives-ouvertes.fr/hal-00280188 Geochemistry, Geophysics, Geosystems, AGU and the Geochemical Society, 2005, 6, pp.Q12008. ⟨10.1029/2005GC000956⟩ boundary exchange neodymium isotopic composition North Atlantic Deep Water rare earth elements sediment seawater interaction [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2005 ftccsdartic https://doi.org/10.1029/2005GC000956 2021-10-23T23:59:11Z The North Atlantic Deep Water (NADW) neodymium isotopic composition (Nd IC) is increasingly used in oceanography and paleoceanography to trace large-scale circulation and weathering processes, notably to investigate past variations of the global thermohaline circulation. Although the present-day NADW Nd IC is well characterized at e Nd = À13.5, the acquisition of this isotopic signature (in other words, the causes of this value) has so far been very sparsely documented. Such an understanding is, however, fundamental to the interpretation of paleo records. Nd IC and rare earth element concentrations were measured at 9 stations within the North Atlantic Subpolar Gyre (SIGNATURE cruise, summer 1999). The comparison of this data set with our understanding of water mass circulation provides a description of how the three layers constituting the NADW, the Labrador Sea Water (LSW, e Nd = À13.9 ± 0.4), North East Atlantic Deep Water (NEADW, e Nd À13.2 ± 0.4), and North West Atlantic Bottom Water (NWABW, e Nd À14.5 ± 0.4), acquire their Nd IC through distinct water mass mixings and lithogenic inputs. These different mechanisms, acting upon water masses from very diverse sources, seem to bring the Nd IC of the three NADW layers to values close together and similar to that of the NADW. It is suggested that sediment/seawater interactions significantly lower the NEADW and NWABW Nd IC along the South East Greenland margin. Since these interactions do not significantly modify the Nd content of these water masses, sediment remobilizations leading to the Nd IC variations are probably associated with Nd removal fluxes from the water mass toward the sediment, a process called boundary exchange. On the other hand, LSW seems to acquire its Nd IC from the Subpolar Mode Waters from which it is formed by deep convection, and no other mechanism needs to be invoked. Its unradiogenic signature could ultimately be linked to fresh water runoff from the Canadian Shield. These conclusions should allow more precise interpretations of ... Article in Journal/Newspaper East Greenland Greenland Labrador Sea NADW North Atlantic Deep Water North Atlantic North East Atlantic North West Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Greenland Geochemistry, Geophysics, Geosystems 6 12 n/a n/a |