Interannual surface salinity in Northwest Atlantic shelf
International audience Sea surface salinity (SSS) from the Aquarius and SMOS satellite missions displays a steady increase of ~1psu over the entire northwestern Atlantic shelf south of Nova Scotia during the 2011-2015. Put in the context of longer ocean profile data the results suggest that mixed la...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://hal.science/hal-04201848 https://hal.science/hal-04201848/document https://hal.science/hal-04201848/file/JGR%20Oceans%20-%202017%20-%20Grodsky.pdf https://doi.org/10.1002/2016JC012580 |
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ftunivbrest:oai:HAL:hal-04201848v1 2024-04-14T08:16:46+00:00 Interannual surface salinity in Northwest Atlantic shelf Grodsky, Semyon A. Reul, Nicolas Chapron, Bertrand Carton, James A. Bryan, Frank O. 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)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 2017-05 https://hal.science/hal-04201848 https://hal.science/hal-04201848/document https://hal.science/hal-04201848/file/JGR%20Oceans%20-%202017%20-%20Grodsky.pdf https://doi.org/10.1002/2016JC012580 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1002/2016JC012580 hal-04201848 https://hal.science/hal-04201848 https://hal.science/hal-04201848/document https://hal.science/hal-04201848/file/JGR%20Oceans%20-%202017%20-%20Grodsky.pdf doi:10.1002/2016JC012580 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.science/hal-04201848 Journal of Geophysical Research. Oceans, 2017, 122 (5), pp.3638-3659. ⟨10.1002/2016JC012580⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2017 ftunivbrest https://doi.org/10.1002/2016JC012580 2024-03-21T16:22:40Z International audience Sea surface salinity (SSS) from the Aquarius and SMOS satellite missions displays a steady increase of ~1psu over the entire northwestern Atlantic shelf south of Nova Scotia during the 2011-2015. Put in the context of longer ocean profile data the results suggest that mixed layer salinity and temperature north of the Gulf Stream experience positively correlated shelf-wide interannual oscillations (1psu/2degC). Salty and warm events occur coincident with anomalous easterly-southeasterly winds and Ekman transport counteracting the mean southwestward shelf currents. They are coincident with the weakening of both branches of the Scotian Shelf Current (SSC), but only moderately correlate with shifts of the Gulf Stream North Wall. This suggests that salt advection by anomalous SSC acting on the mean salinity gradient is the primary driver regulating the transport of fresh/cold water from high latitudes. The advection mechanism imposes a connectedness of the larger-scale interannual variability in this region and its tie to atmospheric oscillations. In the second part, an analysis of 15-year long numerical simulations is presented which show 8 interannual salinity oscillations (positive and negative). Six of these are driven by the horizontal advection by slow varying currents (>2 months), while 2 events are driven by the horizontal eddy advection (<2 months). In line with observations, salt/warm model events correspond to anomalously weak SSC, correlate with southeasterly wind anomaly, and confirm that interannual horizontal salt advection drives the interannual salinity. Indeed, vertical exchanges provide a negative feedback, while interannual horizontal diffusion and the net surface salt flux anomalies are small. Article in Journal/Newspaper Northwest Atlantic Université de Bretagne Occidentale: HAL Journal of Geophysical Research: Oceans 122 5 3638 3659 |
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Open Polar |
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Université de Bretagne Occidentale: HAL |
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ftunivbrest |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Grodsky, Semyon A. Reul, Nicolas Chapron, Bertrand Carton, James A. Bryan, Frank O. Interannual surface salinity in Northwest Atlantic shelf |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience Sea surface salinity (SSS) from the Aquarius and SMOS satellite missions displays a steady increase of ~1psu over the entire northwestern Atlantic shelf south of Nova Scotia during the 2011-2015. Put in the context of longer ocean profile data the results suggest that mixed layer salinity and temperature north of the Gulf Stream experience positively correlated shelf-wide interannual oscillations (1psu/2degC). Salty and warm events occur coincident with anomalous easterly-southeasterly winds and Ekman transport counteracting the mean southwestward shelf currents. They are coincident with the weakening of both branches of the Scotian Shelf Current (SSC), but only moderately correlate with shifts of the Gulf Stream North Wall. This suggests that salt advection by anomalous SSC acting on the mean salinity gradient is the primary driver regulating the transport of fresh/cold water from high latitudes. The advection mechanism imposes a connectedness of the larger-scale interannual variability in this region and its tie to atmospheric oscillations. In the second part, an analysis of 15-year long numerical simulations is presented which show 8 interannual salinity oscillations (positive and negative). Six of these are driven by the horizontal advection by slow varying currents (>2 months), while 2 events are driven by the horizontal eddy advection (<2 months). In line with observations, salt/warm model events correspond to anomalously weak SSC, correlate with southeasterly wind anomaly, and confirm that interannual horizontal salt advection drives the interannual salinity. Indeed, vertical exchanges provide a negative feedback, while interannual horizontal diffusion and the net surface salt flux anomalies are small. |
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)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Grodsky, Semyon A. Reul, Nicolas Chapron, Bertrand Carton, James A. Bryan, Frank O. |
author_facet |
Grodsky, Semyon A. Reul, Nicolas Chapron, Bertrand Carton, James A. Bryan, Frank O. |
author_sort |
Grodsky, Semyon A. |
title |
Interannual surface salinity in Northwest Atlantic shelf |
title_short |
Interannual surface salinity in Northwest Atlantic shelf |
title_full |
Interannual surface salinity in Northwest Atlantic shelf |
title_fullStr |
Interannual surface salinity in Northwest Atlantic shelf |
title_full_unstemmed |
Interannual surface salinity in Northwest Atlantic shelf |
title_sort |
interannual surface salinity in northwest atlantic shelf |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.science/hal-04201848 https://hal.science/hal-04201848/document https://hal.science/hal-04201848/file/JGR%20Oceans%20-%202017%20-%20Grodsky.pdf https://doi.org/10.1002/2016JC012580 |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-04201848 Journal of Geophysical Research. Oceans, 2017, 122 (5), pp.3638-3659. ⟨10.1002/2016JC012580⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2016JC012580 hal-04201848 https://hal.science/hal-04201848 https://hal.science/hal-04201848/document https://hal.science/hal-04201848/file/JGR%20Oceans%20-%202017%20-%20Grodsky.pdf doi:10.1002/2016JC012580 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2016JC012580 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
122 |
container_issue |
5 |
container_start_page |
3638 |
op_container_end_page |
3659 |
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1796315502155399168 |