ISOW Spreading and Mixing as Revealed by Deep‐Argo Floats Launched in the Charlie‐Gibbs Fracture Zone
International audience To improve our understanding of deep circulation, we deployed five Deep‐Argo floats (0–4,000 m) in the Charlie‐Gibbs Fracture Zone (CGFZ), which channels the flow of Iceland‐Scotland Overflow Water (ISOW), a dense water mass of the North Atlantic Ocean. The floats were program...
Published in: | Journal of Geophysical Research: Oceans |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://hal.archives-ouvertes.fr/hal-02382468 https://hal.archives-ouvertes.fr/hal-02382468/document https://hal.archives-ouvertes.fr/hal-02382468/file/2019JC015040.pdf https://doi.org/10.1029/2019JC015040 |
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ftccsdartic:oai:HAL:hal-02382468v1 2023-05-15T16:00:41+02:00 ISOW Spreading and Mixing as Revealed by Deep‐Argo Floats Launched in the Charlie‐Gibbs Fracture Zone Racapé, Virginie Thierry, Virginie Mercier, Herlé Cabanes, Cécile Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) ANR-10-EQPX-0040,NAOS,Observations de l'océan global pour l'étude et la prévision de l'océan et du climat: préparation de la nouvelle décennie d'Argo(2010) European Project: 633211,H2020,H2020-BG-2014-2,AtlantOS(2015) 2019-10-14 https://hal.archives-ouvertes.fr/hal-02382468 https://hal.archives-ouvertes.fr/hal-02382468/document https://hal.archives-ouvertes.fr/hal-02382468/file/2019JC015040.pdf https://doi.org/10.1029/2019JC015040 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2019JC015040 info:eu-repo/grantAgreement//633211/EU/Optimizing and Enhancing the Integrated Atlantic Ocean Observing System/AtlantOS hal-02382468 https://hal.archives-ouvertes.fr/hal-02382468 https://hal.archives-ouvertes.fr/hal-02382468/document https://hal.archives-ouvertes.fr/hal-02382468/file/2019JC015040.pdf doi:10.1029/2019JC015040 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.archives-ouvertes.fr/hal-02382468 Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2019, ⟨10.1029/2019JC015040⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2019 ftccsdartic https://doi.org/10.1029/2019JC015040 2021-11-27T23:31:34Z International audience To improve our understanding of deep circulation, we deployed five Deep‐Argo floats (0–4,000 m) in the Charlie‐Gibbs Fracture Zone (CGFZ), which channels the flow of Iceland‐Scotland Overflow Water (ISOW), a dense water mass of the North Atlantic Ocean. The floats were programed to drift at 2,750 dbar in the ISOW layer. The floats mainly moved westward in the CGFZ, although some of them followed different routes for few cycles depending on northward intrusions of the North Atlantic Current over the CGFZ. One float revealed a direct route for ISOW from CGFZ to the Deep Western Boundary Current at Flemish Cap. In the CGFZ, oxygen data acquired by the floats revealed that the ISOW layer, characterized by salinity higher than 34.94 and density greater than 27.8 kg/m, was mainly composed of the highly oxygenated ISOW and the less oxygenated North East Atlantic Deep Water (NEADW), a complex water mass from the East Atlantic. In the ISOW layer, the relative contribution of ISOW was generally larger in the northern valley than in the southern valley of CGFZ. Northward intrusions of the North Atlantic Current above the CGFZ increased the relative contribution of NEADW in the northern valley and favors mixing between ISOW and NEADW. The ISOW‐NEADW signal flowing westward from the CGFZ toward the Deep Western Boundary Current was progressively diluted by Labrador Sea Water and Denmark Strait Overflow Water. Oxygen measurements from Deep‐Argo floats are essential for a better understanding and characterization of the mixing and spreading of deep water masses. Article in Journal/Newspaper Denmark Strait Iceland Labrador Sea north atlantic current North Atlantic North East Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Journal of Geophysical Research: Oceans 124 10 6787 6808 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Racapé, Virginie Thierry, Virginie Mercier, Herlé Cabanes, Cécile ISOW Spreading and Mixing as Revealed by Deep‐Argo Floats Launched in the Charlie‐Gibbs Fracture Zone |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience To improve our understanding of deep circulation, we deployed five Deep‐Argo floats (0–4,000 m) in the Charlie‐Gibbs Fracture Zone (CGFZ), which channels the flow of Iceland‐Scotland Overflow Water (ISOW), a dense water mass of the North Atlantic Ocean. The floats were programed to drift at 2,750 dbar in the ISOW layer. The floats mainly moved westward in the CGFZ, although some of them followed different routes for few cycles depending on northward intrusions of the North Atlantic Current over the CGFZ. One float revealed a direct route for ISOW from CGFZ to the Deep Western Boundary Current at Flemish Cap. In the CGFZ, oxygen data acquired by the floats revealed that the ISOW layer, characterized by salinity higher than 34.94 and density greater than 27.8 kg/m, was mainly composed of the highly oxygenated ISOW and the less oxygenated North East Atlantic Deep Water (NEADW), a complex water mass from the East Atlantic. In the ISOW layer, the relative contribution of ISOW was generally larger in the northern valley than in the southern valley of CGFZ. Northward intrusions of the North Atlantic Current above the CGFZ increased the relative contribution of NEADW in the northern valley and favors mixing between ISOW and NEADW. The ISOW‐NEADW signal flowing westward from the CGFZ toward the Deep Western Boundary Current was progressively diluted by Labrador Sea Water and Denmark Strait Overflow Water. Oxygen measurements from Deep‐Argo floats are essential for a better understanding and characterization of the mixing and spreading of deep water masses. |
author2 |
Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) ANR-10-EQPX-0040,NAOS,Observations de l'océan global pour l'étude et la prévision de l'océan et du climat: préparation de la nouvelle décennie d'Argo(2010) European Project: 633211,H2020,H2020-BG-2014-2,AtlantOS(2015) |
format |
Article in Journal/Newspaper |
author |
Racapé, Virginie Thierry, Virginie Mercier, Herlé Cabanes, Cécile |
author_facet |
Racapé, Virginie Thierry, Virginie Mercier, Herlé Cabanes, Cécile |
author_sort |
Racapé, Virginie |
title |
ISOW Spreading and Mixing as Revealed by Deep‐Argo Floats Launched in the Charlie‐Gibbs Fracture Zone |
title_short |
ISOW Spreading and Mixing as Revealed by Deep‐Argo Floats Launched in the Charlie‐Gibbs Fracture Zone |
title_full |
ISOW Spreading and Mixing as Revealed by Deep‐Argo Floats Launched in the Charlie‐Gibbs Fracture Zone |
title_fullStr |
ISOW Spreading and Mixing as Revealed by Deep‐Argo Floats Launched in the Charlie‐Gibbs Fracture Zone |
title_full_unstemmed |
ISOW Spreading and Mixing as Revealed by Deep‐Argo Floats Launched in the Charlie‐Gibbs Fracture Zone |
title_sort |
isow spreading and mixing as revealed by deep‐argo floats launched in the charlie‐gibbs fracture zone |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.archives-ouvertes.fr/hal-02382468 https://hal.archives-ouvertes.fr/hal-02382468/document https://hal.archives-ouvertes.fr/hal-02382468/file/2019JC015040.pdf https://doi.org/10.1029/2019JC015040 |
genre |
Denmark Strait Iceland Labrador Sea north atlantic current North Atlantic North East Atlantic |
genre_facet |
Denmark Strait Iceland Labrador Sea north atlantic current North Atlantic North East Atlantic |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.archives-ouvertes.fr/hal-02382468 Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2019, ⟨10.1029/2019JC015040⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2019JC015040 info:eu-repo/grantAgreement//633211/EU/Optimizing and Enhancing the Integrated Atlantic Ocean Observing System/AtlantOS hal-02382468 https://hal.archives-ouvertes.fr/hal-02382468 https://hal.archives-ouvertes.fr/hal-02382468/document https://hal.archives-ouvertes.fr/hal-02382468/file/2019JC015040.pdf doi:10.1029/2019JC015040 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2019JC015040 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
124 |
container_issue |
10 |
container_start_page |
6787 |
op_container_end_page |
6808 |
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1766396687829434368 |