ISOW spreading and mixing as revealed by Deep‐Argo floats launched in the Charlie Gibbs Fracture Zone
To improve our understanding of deep circulation, we deployed five Deep‐Argo floats (0–4000 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 programmed to drift at 2750 dba...
Published in: | Journal of Geophysical Research: Oceans |
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American Geophysical Union (AGU)
2019
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ftarchimer:oai:archimer.ifremer.fr:62428 2023-05-15T16:00:41+02:00 ISOW spreading and mixing as revealed by Deep‐Argo floats launched in the Charlie Gibbs Fracture Zone Racape, V. Thierry, Virginie Mercier, Herle Cabanes, Cecile 2019-10 application/pdf https://archimer.ifremer.fr/doc/00513/62428/66710.pdf https://archimer.ifremer.fr/doc/00513/62428/66711.pdf https://doi.org/10.1029/2019JC015040 https://archimer.ifremer.fr/doc/00513/62428/ eng eng American Geophysical Union (AGU) info:eu-repo/grantAgreement/EC/FP7/633211/EU//AtlantOS https://archimer.ifremer.fr/doc/00513/62428/66710.pdf https://archimer.ifremer.fr/doc/00513/62428/66711.pdf doi:10.1029/2019JC015040 https://archimer.ifremer.fr/doc/00513/62428/ info:eu-repo/semantics/openAccess restricted use Journal Of Geophysical Research-oceans (2169-9275) (American Geophysical Union (AGU)), 2019-10 , Vol. 124 , N. 10 , P. 6787-6808 North Atlantic Ocean deep circulation Deep-Argo float mixing North Atlantic Current Iceland-Scotland Overflow Water text Publication info:eu-repo/semantics/article 2019 ftarchimer https://doi.org/10.1029/2019JC015040 2021-09-23T20:33:28Z To improve our understanding of deep circulation, we deployed five Deep‐Argo floats (0–4000 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 programmed to drift at 2750 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 (NAC) 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‐3, 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 NAC above the CGFZ increased the relative contribution of NEADW in the northern valley and favours mixing between ISOW and NEADW. The ISOW‐NEADW signal flowing westward from the CGFZ towards the DWBC 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 Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Journal of Geophysical Research: Oceans 124 10 6787 6808 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
North Atlantic Ocean deep circulation Deep-Argo float mixing North Atlantic Current Iceland-Scotland Overflow Water |
spellingShingle |
North Atlantic Ocean deep circulation Deep-Argo float mixing North Atlantic Current Iceland-Scotland Overflow Water Racape, V. Thierry, Virginie Mercier, Herle Cabanes, Cecile ISOW spreading and mixing as revealed by Deep‐Argo floats launched in the Charlie Gibbs Fracture Zone |
topic_facet |
North Atlantic Ocean deep circulation Deep-Argo float mixing North Atlantic Current Iceland-Scotland Overflow Water |
description |
To improve our understanding of deep circulation, we deployed five Deep‐Argo floats (0–4000 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 programmed to drift at 2750 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 (NAC) 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‐3, 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 NAC above the CGFZ increased the relative contribution of NEADW in the northern valley and favours mixing between ISOW and NEADW. The ISOW‐NEADW signal flowing westward from the CGFZ towards the DWBC 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. |
format |
Article in Journal/Newspaper |
author |
Racape, V. Thierry, Virginie Mercier, Herle Cabanes, Cecile |
author_facet |
Racape, V. Thierry, Virginie Mercier, Herle Cabanes, Cecile |
author_sort |
Racape, V. |
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 |
American Geophysical Union (AGU) |
publishDate |
2019 |
url |
https://archimer.ifremer.fr/doc/00513/62428/66710.pdf https://archimer.ifremer.fr/doc/00513/62428/66711.pdf https://doi.org/10.1029/2019JC015040 https://archimer.ifremer.fr/doc/00513/62428/ |
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 |
Journal Of Geophysical Research-oceans (2169-9275) (American Geophysical Union (AGU)), 2019-10 , Vol. 124 , N. 10 , P. 6787-6808 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/633211/EU//AtlantOS https://archimer.ifremer.fr/doc/00513/62428/66710.pdf https://archimer.ifremer.fr/doc/00513/62428/66711.pdf doi:10.1029/2019JC015040 https://archimer.ifremer.fr/doc/00513/62428/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
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 |
_version_ |
1766396688365256704 |