Impact of the winter North-Atlantic weather regimes on subtropical sea-surface height variability
Interannual variability of subtropical sea-surface-height (SSH) anomalies, estimated by satellite and tide-gauge data, is investigated in relation to wintertime daily North-Atlantic weather regimes. Sea-level anomalies can be viewed as proxies for the subtropical gyre intensity because of the intrin...
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ftarchimer:oai:archimer.ifremer.fr:27248 2023-05-15T17:27:49+02:00 Impact of the winter North-Atlantic weather regimes on subtropical sea-surface height variability Barrier, Nicolas Treguier, Anne-marie Cassou, Christophe Deshayes, Julie 2013-09 application/pdf https://archimer.ifremer.fr/doc/00161/27248/25480.pdf https://doi.org/10.1007/s00382-012-1578-7 https://archimer.ifremer.fr/doc/00161/27248/ eng eng Springer https://archimer.ifremer.fr/doc/00161/27248/25480.pdf doi:10.1007/s00382-012-1578-7 https://archimer.ifremer.fr/doc/00161/27248/ Springer-Verlag Berlin Heidelberg 2012 info:eu-repo/semantics/openAccess restricted use Climate Dynamics (0930-7575) (Springer), 2013-09 , Vol. 41 , N. 5-6 , P. 1159-1171 text Publication info:eu-repo/semantics/article 2013 ftarchimer https://doi.org/10.1007/s00382-012-1578-7 2021-09-23T20:23:36Z Interannual variability of subtropical sea-surface-height (SSH) anomalies, estimated by satellite and tide-gauge data, is investigated in relation to wintertime daily North-Atlantic weather regimes. Sea-level anomalies can be viewed as proxies for the subtropical gyre intensity because of the intrinsic baroclinic structure of the circulation. Our results show that the strongest correlation between SSH and weather regimes is found with the so-called Atlantic-Ridge (AR) while no significant values are obtained for the other regimes, including those related to the North Atlantic Oscillation (NAO), known as the primary actor of the Atlantic dynamics. Wintertime AR events are characterized by anticyclonic wind anomalies off Europe leading to a northward shift of the climatological wind-stress curl. The latter affects subtropical SSH annual variability by altered Sverdrup balance and ocean Rossby wave dynamics propagating westward from the African coast towards the Caribbean. The use of a simple linear planetary geostrophic model allows to quantify those effects and confirms the primary importance of the winter season to explain the largest part of SSH interannual variability in the Atlantic subtropical gyre. Our results open new perspectives in the comprehension of North-Atlantic Ocean variability emphasizing the role of AR as a driver of interannual variability at least of comparable importance to NAO. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) Climate Dynamics 41 5-6 1159 1171 |
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 |
Interannual variability of subtropical sea-surface-height (SSH) anomalies, estimated by satellite and tide-gauge data, is investigated in relation to wintertime daily North-Atlantic weather regimes. Sea-level anomalies can be viewed as proxies for the subtropical gyre intensity because of the intrinsic baroclinic structure of the circulation. Our results show that the strongest correlation between SSH and weather regimes is found with the so-called Atlantic-Ridge (AR) while no significant values are obtained for the other regimes, including those related to the North Atlantic Oscillation (NAO), known as the primary actor of the Atlantic dynamics. Wintertime AR events are characterized by anticyclonic wind anomalies off Europe leading to a northward shift of the climatological wind-stress curl. The latter affects subtropical SSH annual variability by altered Sverdrup balance and ocean Rossby wave dynamics propagating westward from the African coast towards the Caribbean. The use of a simple linear planetary geostrophic model allows to quantify those effects and confirms the primary importance of the winter season to explain the largest part of SSH interannual variability in the Atlantic subtropical gyre. Our results open new perspectives in the comprehension of North-Atlantic Ocean variability emphasizing the role of AR as a driver of interannual variability at least of comparable importance to NAO. |
format |
Article in Journal/Newspaper |
author |
Barrier, Nicolas Treguier, Anne-marie Cassou, Christophe Deshayes, Julie |
spellingShingle |
Barrier, Nicolas Treguier, Anne-marie Cassou, Christophe Deshayes, Julie Impact of the winter North-Atlantic weather regimes on subtropical sea-surface height variability |
author_facet |
Barrier, Nicolas Treguier, Anne-marie Cassou, Christophe Deshayes, Julie |
author_sort |
Barrier, Nicolas |
title |
Impact of the winter North-Atlantic weather regimes on subtropical sea-surface height variability |
title_short |
Impact of the winter North-Atlantic weather regimes on subtropical sea-surface height variability |
title_full |
Impact of the winter North-Atlantic weather regimes on subtropical sea-surface height variability |
title_fullStr |
Impact of the winter North-Atlantic weather regimes on subtropical sea-surface height variability |
title_full_unstemmed |
Impact of the winter North-Atlantic weather regimes on subtropical sea-surface height variability |
title_sort |
impact of the winter north-atlantic weather regimes on subtropical sea-surface height variability |
publisher |
Springer |
publishDate |
2013 |
url |
https://archimer.ifremer.fr/doc/00161/27248/25480.pdf https://doi.org/10.1007/s00382-012-1578-7 https://archimer.ifremer.fr/doc/00161/27248/ |
long_lat |
ENVELOPE(-63.071,-63.071,-70.797,-70.797) |
geographic |
Curl |
geographic_facet |
Curl |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Climate Dynamics (0930-7575) (Springer), 2013-09 , Vol. 41 , N. 5-6 , P. 1159-1171 |
op_relation |
https://archimer.ifremer.fr/doc/00161/27248/25480.pdf doi:10.1007/s00382-012-1578-7 https://archimer.ifremer.fr/doc/00161/27248/ |
op_rights |
Springer-Verlag Berlin Heidelberg 2012 info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1007/s00382-012-1578-7 |
container_title |
Climate Dynamics |
container_volume |
41 |
container_issue |
5-6 |
container_start_page |
1159 |
op_container_end_page |
1171 |
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1766120114442207232 |