Nordic Seas and Subarctic Atlantic water masses traced by neodymium isotopes
The neodymium isotopic composition (Nd I.C.) is a tracer of oceanic circulation and of ocean/continent matter exchanges. We measured this parameter in almost 200 seawater samples from the Nordic Seas (Greenland, Iceland and Norwegian) and the Subarctic Atlantic (north of 50°N). The interpretation of...
Main Author: | |
---|---|
Other Authors: | , , , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
Published: |
HAL CCSD
2002
|
Subjects: | |
Online Access: | https://tel.archives-ouvertes.fr/tel-00118162 https://tel.archives-ouvertes.fr/tel-00118162/document https://tel.archives-ouvertes.fr/tel-00118162/file/theserv.pdf |
id |
ftccsdartic:oai:HAL:tel-00118162v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
French |
topic |
isotopic tracers North Atlantic water masses neodymium interactions continent/océan traceurs isotopiques boundary exchange masses d'eau érosion néodyme Atlantic Nord [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
isotopic tracers North Atlantic water masses neodymium interactions continent/océan traceurs isotopiques boundary exchange masses d'eau érosion néodyme Atlantic Nord [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Lacan, F. Nordic Seas and Subarctic Atlantic water masses traced by neodymium isotopes |
topic_facet |
isotopic tracers North Atlantic water masses neodymium interactions continent/océan traceurs isotopiques boundary exchange masses d'eau érosion néodyme Atlantic Nord [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
The neodymium isotopic composition (Nd I.C.) is a tracer of oceanic circulation and of ocean/continent matter exchanges. We measured this parameter in almost 200 seawater samples from the Nordic Seas (Greenland, Iceland and Norwegian) and the Subarctic Atlantic (north of 50°N). The interpretation of these data in relation with the hydrology and the geology of the studied area allowed to improve our knowledge of the circulation and the tracer Nd CI. The study of the isotopic signature of the Subarctic Intermediate Water (SAIW), the Norwegian Sea Deep Water and the Subpolar Mode Water (SPMW) allowed us to better understand their history (pathways, mixings). In particular, we confirm the SAIW originates in the Labrador Current and we suggest that the SPMW is the result of a two end-member mixture : Central North Atlantic Water and waters from the Labrador Current. Nd I.C. are in good agreement with the commonly accepted scenarios of the formation of the upper and lower layers of the North Atlantic Deep Water (NADW). On the other hand they suggest a North East Atlantic Deep Water composition significantly different from that of the middle layer of the NADW. This point will require further studies. We firmly confirm that the Nd IC is conservative in the absence of terrigeneous input. We show the influence of granitic derived sediments on water masse Nd I.C. and confirm that of basaltic derived sediments. We suggest that the Nd IC partially lost the memory of water mass history during sediment/ocean interactions, within high hydraulic energy areas. Lastly, we suggest that passed erosion variations would modify NADW signature as much as or maybe more than circulation variations. La composition isotopique de néodyme (C.I. de Nd) est un traceur de circulation océanique et d'échanges de matière océan/continent. Nous avons mesuré cette grandeur sur près de 200 échantillons d'eau de mer des mers Nordiques (Groenland, Islande, Norvège) et de l'Atlantique Subarctique (au nord de 50°N). L'interprétation de ces données en ... |
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) Université Paul Sabatier - Toulouse III Catherine Jeandel |
format |
Doctoral or Postdoctoral Thesis |
author |
Lacan, F. |
author_facet |
Lacan, F. |
author_sort |
Lacan, F. |
title |
Nordic Seas and Subarctic Atlantic water masses traced by neodymium isotopes |
title_short |
Nordic Seas and Subarctic Atlantic water masses traced by neodymium isotopes |
title_full |
Nordic Seas and Subarctic Atlantic water masses traced by neodymium isotopes |
title_fullStr |
Nordic Seas and Subarctic Atlantic water masses traced by neodymium isotopes |
title_full_unstemmed |
Nordic Seas and Subarctic Atlantic water masses traced by neodymium isotopes |
title_sort |
nordic seas and subarctic atlantic water masses traced by neodymium isotopes |
publisher |
HAL CCSD |
publishDate |
2002 |
url |
https://tel.archives-ouvertes.fr/tel-00118162 https://tel.archives-ouvertes.fr/tel-00118162/document https://tel.archives-ouvertes.fr/tel-00118162/file/theserv.pdf |
geographic |
Greenland Norwegian Sea |
geographic_facet |
Greenland Norwegian Sea |
genre |
Greenland Groenland Iceland Islande NADW Nordic Seas North Atlantic Deep Water North Atlantic North East Atlantic Norwegian Sea Subarctic subarctique* |
genre_facet |
Greenland Groenland Iceland Islande NADW Nordic Seas North Atlantic Deep Water North Atlantic North East Atlantic Norwegian Sea Subarctic subarctique* |
op_source |
https://tel.archives-ouvertes.fr/tel-00118162 Océan, Atmosphère. Université Paul Sabatier - Toulouse III, 2002. Français |
op_relation |
tel-00118162 https://tel.archives-ouvertes.fr/tel-00118162 https://tel.archives-ouvertes.fr/tel-00118162/document https://tel.archives-ouvertes.fr/tel-00118162/file/theserv.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766020332158713856 |
spelling |
ftccsdartic:oai:HAL:tel-00118162v1 2023-05-15T16:30:36+02:00 Nordic Seas and Subarctic Atlantic water masses traced by neodymium isotopes Masses d'eau des Mers Nordiques et de l'Atlantique Subarctique tracées par les isotopes du néodyme Lacan, F. 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) Université Paul Sabatier - Toulouse III Catherine Jeandel 2002-12-11 https://tel.archives-ouvertes.fr/tel-00118162 https://tel.archives-ouvertes.fr/tel-00118162/document https://tel.archives-ouvertes.fr/tel-00118162/file/theserv.pdf fr fre HAL CCSD tel-00118162 https://tel.archives-ouvertes.fr/tel-00118162 https://tel.archives-ouvertes.fr/tel-00118162/document https://tel.archives-ouvertes.fr/tel-00118162/file/theserv.pdf info:eu-repo/semantics/OpenAccess https://tel.archives-ouvertes.fr/tel-00118162 Océan, Atmosphère. Université Paul Sabatier - Toulouse III, 2002. Français isotopic tracers North Atlantic water masses neodymium interactions continent/océan traceurs isotopiques boundary exchange masses d'eau érosion néodyme Atlantic Nord [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/doctoralThesis Theses 2002 ftccsdartic 2021-10-24T22:51:35Z The neodymium isotopic composition (Nd I.C.) is a tracer of oceanic circulation and of ocean/continent matter exchanges. We measured this parameter in almost 200 seawater samples from the Nordic Seas (Greenland, Iceland and Norwegian) and the Subarctic Atlantic (north of 50°N). The interpretation of these data in relation with the hydrology and the geology of the studied area allowed to improve our knowledge of the circulation and the tracer Nd CI. The study of the isotopic signature of the Subarctic Intermediate Water (SAIW), the Norwegian Sea Deep Water and the Subpolar Mode Water (SPMW) allowed us to better understand their history (pathways, mixings). In particular, we confirm the SAIW originates in the Labrador Current and we suggest that the SPMW is the result of a two end-member mixture : Central North Atlantic Water and waters from the Labrador Current. Nd I.C. are in good agreement with the commonly accepted scenarios of the formation of the upper and lower layers of the North Atlantic Deep Water (NADW). On the other hand they suggest a North East Atlantic Deep Water composition significantly different from that of the middle layer of the NADW. This point will require further studies. We firmly confirm that the Nd IC is conservative in the absence of terrigeneous input. We show the influence of granitic derived sediments on water masse Nd I.C. and confirm that of basaltic derived sediments. We suggest that the Nd IC partially lost the memory of water mass history during sediment/ocean interactions, within high hydraulic energy areas. Lastly, we suggest that passed erosion variations would modify NADW signature as much as or maybe more than circulation variations. La composition isotopique de néodyme (C.I. de Nd) est un traceur de circulation océanique et d'échanges de matière océan/continent. Nous avons mesuré cette grandeur sur près de 200 échantillons d'eau de mer des mers Nordiques (Groenland, Islande, Norvège) et de l'Atlantique Subarctique (au nord de 50°N). L'interprétation de ces données en ... Doctoral or Postdoctoral Thesis Greenland Groenland Iceland Islande NADW Nordic Seas North Atlantic Deep Water North Atlantic North East Atlantic Norwegian Sea Subarctic subarctique* Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Greenland Norwegian Sea |