Intermediate water flows in the western South Pacific: as revealed by individual Argo floats trajectories and a model re-analysis
Thanks to the autonomous Argo floats of the OUTPACE cruise (Oligotrophy to UlTra-oligotrophy PACific Experiment) and of the THOT (TaHitian Ocean Time series) project, some features of intermediate-flow dynamics, at around 1000 m depth, within the central and western South Pacific Ocean (around 19° S...
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ftarchimer:oai:archimer.ifremer.fr:56005 2023-05-15T13:47:37+02:00 Intermediate water flows in the western South Pacific: as revealed by individual Argo floats trajectories and a model re-analysis Barbot, Simon Petrenko, Anne Maes, Christophe 2018-07 application/pdf https://archimer.ifremer.fr/doc/00448/56005/57512.pdf https://archimer.ifremer.fr/doc/00448/56005/57513.pdf https://doi.org/10.5194/bg-15-4103-2018 https://archimer.ifremer.fr/doc/00448/56005/ eng eng Copernicus Gesellschaft Mbh https://archimer.ifremer.fr/doc/00448/56005/57512.pdf https://archimer.ifremer.fr/doc/00448/56005/57513.pdf doi:10.5194/bg-15-4103-2018 https://archimer.ifremer.fr/doc/00448/56005/ Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License. info:eu-repo/semantics/openAccess restricted use CC-BY Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2018-07 , Vol. 15 , N. 13 , P. 4103-4124 text Publication info:eu-repo/semantics/article 2018 ftarchimer https://doi.org/10.5194/bg-15-4103-2018 2023-01-17T23:50:42Z Thanks to the autonomous Argo floats of the OUTPACE cruise (Oligotrophy to UlTra-oligotrophy PACific Experiment) and of the THOT (TaHitian Ocean Time series) project, some features of intermediate-flow dynamics, at around 1000 m depth, within the central and western South Pacific Ocean (around 19° S, 156° E–150° W) are described. In the Coral Sea, we highlight minima in dissolved oxygen of 140 µmol kg−1 that are associated with the signature of a southward transport of waters between two zonal jets: from the North Vanuatu Jet to the North Caledonia Jet. This transport takes place in the core of a cyclonic eddy or via the path between a cyclonic eddy and an anticyclonic one, highlighting the importance of mesoscale dynamics in upper thermocline and surface layers. Further east, we observe a strong meridional velocity shear with long-term float trajectories going either eastward or westward in the lower thermocline. More interestingly, these trajectories also exhibit some oscillatory features. Those trajectories can be explained by a single Rossby wave of 160-day duration and 855 km wavelength. Considering the thermohaline context, we confirm the meridional shear of zonal velocity and highlight a permanent density front that corresponds to the interface between Antarctic intermediate waters and North Pacific deep waters. Hence both circulation and thermohaline contexts are highly prone to instabilities and wave propagation. Article in Journal/Newspaper Antarc* Antarctic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Pacific Biogeosciences 15 13 4103 4124 |
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 |
description |
Thanks to the autonomous Argo floats of the OUTPACE cruise (Oligotrophy to UlTra-oligotrophy PACific Experiment) and of the THOT (TaHitian Ocean Time series) project, some features of intermediate-flow dynamics, at around 1000 m depth, within the central and western South Pacific Ocean (around 19° S, 156° E–150° W) are described. In the Coral Sea, we highlight minima in dissolved oxygen of 140 µmol kg−1 that are associated with the signature of a southward transport of waters between two zonal jets: from the North Vanuatu Jet to the North Caledonia Jet. This transport takes place in the core of a cyclonic eddy or via the path between a cyclonic eddy and an anticyclonic one, highlighting the importance of mesoscale dynamics in upper thermocline and surface layers. Further east, we observe a strong meridional velocity shear with long-term float trajectories going either eastward or westward in the lower thermocline. More interestingly, these trajectories also exhibit some oscillatory features. Those trajectories can be explained by a single Rossby wave of 160-day duration and 855 km wavelength. Considering the thermohaline context, we confirm the meridional shear of zonal velocity and highlight a permanent density front that corresponds to the interface between Antarctic intermediate waters and North Pacific deep waters. Hence both circulation and thermohaline contexts are highly prone to instabilities and wave propagation. |
format |
Article in Journal/Newspaper |
author |
Barbot, Simon Petrenko, Anne Maes, Christophe |
spellingShingle |
Barbot, Simon Petrenko, Anne Maes, Christophe Intermediate water flows in the western South Pacific: as revealed by individual Argo floats trajectories and a model re-analysis |
author_facet |
Barbot, Simon Petrenko, Anne Maes, Christophe |
author_sort |
Barbot, Simon |
title |
Intermediate water flows in the western South Pacific: as revealed by individual Argo floats trajectories and a model re-analysis |
title_short |
Intermediate water flows in the western South Pacific: as revealed by individual Argo floats trajectories and a model re-analysis |
title_full |
Intermediate water flows in the western South Pacific: as revealed by individual Argo floats trajectories and a model re-analysis |
title_fullStr |
Intermediate water flows in the western South Pacific: as revealed by individual Argo floats trajectories and a model re-analysis |
title_full_unstemmed |
Intermediate water flows in the western South Pacific: as revealed by individual Argo floats trajectories and a model re-analysis |
title_sort |
intermediate water flows in the western south pacific: as revealed by individual argo floats trajectories and a model re-analysis |
publisher |
Copernicus Gesellschaft Mbh |
publishDate |
2018 |
url |
https://archimer.ifremer.fr/doc/00448/56005/57512.pdf https://archimer.ifremer.fr/doc/00448/56005/57513.pdf https://doi.org/10.5194/bg-15-4103-2018 https://archimer.ifremer.fr/doc/00448/56005/ |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2018-07 , Vol. 15 , N. 13 , P. 4103-4124 |
op_relation |
https://archimer.ifremer.fr/doc/00448/56005/57512.pdf https://archimer.ifremer.fr/doc/00448/56005/57513.pdf doi:10.5194/bg-15-4103-2018 https://archimer.ifremer.fr/doc/00448/56005/ |
op_rights |
Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License. info:eu-repo/semantics/openAccess restricted use |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-15-4103-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
13 |
container_start_page |
4103 |
op_container_end_page |
4124 |
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1766247543074717696 |