Drivers of Interannual Salinity Variability in the Arctic Ocean
Accurate projections and attribution of Arctic Ocean changes in climate models require a good understanding of the mechanisms underlying interannual salinity variability in the region. Although some mechanisms have been extensively studied in idealized setting, in particular for the dynamics of the...
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ftarchimer:oai:archimer.ifremer.fr:100337 2024-06-23T07:49:54+00:00 Drivers of Interannual Salinity Variability in the Arctic Ocean Hochet, Antoine Lique, Camille Sévellec, Florian Llovel, William 2024-06 application/pdf https://archimer.ifremer.fr/doc/00891/100337/110702.pdf https://doi.org/10.1029/2023JC020852 https://archimer.ifremer.fr/doc/00891/100337/ eng eng American Geophysical Union (AGU) https://archimer.ifremer.fr/doc/00891/100337/110702.pdf doi:10.1029/2023JC020852 https://archimer.ifremer.fr/doc/00891/100337/ info:eu-repo/semantics/openAccess restricted use Journal Of Geophysical Research-oceans (2169-9275) (American Geophysical Union (AGU)), 2024-06 , Vol. 129 , N. 6 , P. e2023JC020852 (21p.) Arctic salinity interannual mechanisms text Article info:eu-repo/semantics/article 2024 ftarchimer https://doi.org/10.1029/2023JC020852 2024-06-12T00:05:55Z Accurate projections and attribution of Arctic Ocean changes in climate models require a good understanding of the mechanisms underlying interannual salinity variability in the region. Although some mechanisms have been extensively studied in idealized setting, in particular for the dynamics of the Beaufort gyre (BG), it remains unclear how applicable they are to more complex systems. This study introduces a new diagnostic based on salinity variance budget to robustly assess the mechanisms of salinity variations. The diagnostic is then applied to the “Estimating the Circulation and Climate of the Ocean” state estimate. Results indicate that the advection of salinity anomaly in the direction of the mean salinity gradient made by velocity anomalies is the primary source of interannual salinity variability. These velocities are primarily attributed to fluctuating winds via Ekman transports. Fluctuating surface freshwater fluxes from the atmosphere and sea ice are the second most important source of variability and cannot be neglected. The two sinks of interannual salinity variance are associated with the erosion of large scale gradients of the mean circulation by eddies and to a lesser extent to the diffusive terms. Over continental shelves, particularly over the East Siberian Shelf (ESS), ocean surface freshwater fluxes and diffusion play a more important role than in the deep basins. We also report a strong intensification of all sources and sinks of interannual salinity variability in the BG and an opposite weakening in the ESS in the second decade of the analysis (2004–2014) with respect to the first (1993–2003). Article in Journal/Newspaper Arctic Arctic Ocean Sea ice Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Arctic Arctic Ocean East Siberian Shelf ENVELOPE(-162.267,-162.267,74.400,74.400) Journal of Geophysical Research: Oceans 129 6 |
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 |
Arctic salinity interannual mechanisms |
spellingShingle |
Arctic salinity interannual mechanisms Hochet, Antoine Lique, Camille Sévellec, Florian Llovel, William Drivers of Interannual Salinity Variability in the Arctic Ocean |
topic_facet |
Arctic salinity interannual mechanisms |
description |
Accurate projections and attribution of Arctic Ocean changes in climate models require a good understanding of the mechanisms underlying interannual salinity variability in the region. Although some mechanisms have been extensively studied in idealized setting, in particular for the dynamics of the Beaufort gyre (BG), it remains unclear how applicable they are to more complex systems. This study introduces a new diagnostic based on salinity variance budget to robustly assess the mechanisms of salinity variations. The diagnostic is then applied to the “Estimating the Circulation and Climate of the Ocean” state estimate. Results indicate that the advection of salinity anomaly in the direction of the mean salinity gradient made by velocity anomalies is the primary source of interannual salinity variability. These velocities are primarily attributed to fluctuating winds via Ekman transports. Fluctuating surface freshwater fluxes from the atmosphere and sea ice are the second most important source of variability and cannot be neglected. The two sinks of interannual salinity variance are associated with the erosion of large scale gradients of the mean circulation by eddies and to a lesser extent to the diffusive terms. Over continental shelves, particularly over the East Siberian Shelf (ESS), ocean surface freshwater fluxes and diffusion play a more important role than in the deep basins. We also report a strong intensification of all sources and sinks of interannual salinity variability in the BG and an opposite weakening in the ESS in the second decade of the analysis (2004–2014) with respect to the first (1993–2003). |
format |
Article in Journal/Newspaper |
author |
Hochet, Antoine Lique, Camille Sévellec, Florian Llovel, William |
author_facet |
Hochet, Antoine Lique, Camille Sévellec, Florian Llovel, William |
author_sort |
Hochet, Antoine |
title |
Drivers of Interannual Salinity Variability in the Arctic Ocean |
title_short |
Drivers of Interannual Salinity Variability in the Arctic Ocean |
title_full |
Drivers of Interannual Salinity Variability in the Arctic Ocean |
title_fullStr |
Drivers of Interannual Salinity Variability in the Arctic Ocean |
title_full_unstemmed |
Drivers of Interannual Salinity Variability in the Arctic Ocean |
title_sort |
drivers of interannual salinity variability in the arctic ocean |
publisher |
American Geophysical Union (AGU) |
publishDate |
2024 |
url |
https://archimer.ifremer.fr/doc/00891/100337/110702.pdf https://doi.org/10.1029/2023JC020852 https://archimer.ifremer.fr/doc/00891/100337/ |
long_lat |
ENVELOPE(-162.267,-162.267,74.400,74.400) |
geographic |
Arctic Arctic Ocean East Siberian Shelf |
geographic_facet |
Arctic Arctic Ocean East Siberian Shelf |
genre |
Arctic Arctic Ocean Sea ice |
genre_facet |
Arctic Arctic Ocean Sea ice |
op_source |
Journal Of Geophysical Research-oceans (2169-9275) (American Geophysical Union (AGU)), 2024-06 , Vol. 129 , N. 6 , P. e2023JC020852 (21p.) |
op_relation |
https://archimer.ifremer.fr/doc/00891/100337/110702.pdf doi:10.1029/2023JC020852 https://archimer.ifremer.fr/doc/00891/100337/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2023JC020852 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
129 |
container_issue |
6 |
_version_ |
1802640631833559040 |