A multi-decadal meridional displacement of the Subpolar Front in the Newfoundland Basin
Observations since the 1950s show a multidecadal cycle of a meridional displacement of the Subpolar Front (SPF) in the Newfoundland Basin (NFB) in the North Atlantic. The SPF displacement is associated with corresponding variations in the path of the North Atlantic Current. We use the ocean general...
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ftopenagrar:oai:www.openagrar.de:timport_mods_00037474 2024-09-15T18:17:17+00:00 A multi-decadal meridional displacement of the Subpolar Front in the Newfoundland Basin Nunez-Riboni, Ismael Bersch, Manfred Haak, Helmuth Jungclaus, Johann H. Lohmann, Katja 2012 11 https://doi.org/10.5194/os-8-91-2012 https://www.openagrar.de/receive/timport_mods_00037474 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00037474/dn050012.pdf eng eng Ocean science : OS -- OceanSci. -- 1812-0784 -- 2212788-4 https://doi.org/10.5194/os-8-91-2012 https://www.openagrar.de/receive/timport_mods_00037474 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00037474/dn050012.pdf only signed in user info:eu-repo/semantics/restrictedAccess article Text article Text doc-type:article 2012 ftopenagrar https://doi.org/10.5194/os-8-91-2012 2024-07-08T23:56:24Z Observations since the 1950s show a multidecadal cycle of a meridional displacement of the Subpolar Front (SPF) in the Newfoundland Basin (NFB) in the North Atlantic. The SPF displacement is associated with corresponding variations in the path of the North Atlantic Current. We use the ocean general circulation model MPIOM with enhanced horizontal and vertical resolutions and forced with NCEP/NCAR reanalysis data to study the relation of the SPF displacement to atmospheric forcing, intensities of the subpolar gyre (SPG) and Meridional Overturning Circulation (MOC), and Labrador Sea Water (LSW) volume. The simulations indicate that the SPF displacement is associated with a circulation anomaly between the SPG and the subtropical gyre (STG), an inter-gyre gyre with a multidecadal time scale. A sensitivity experiment indicates that both wind stress curl (WSC) and heat fluxes (which match LSW changes) contribute to the circulation anomalies in the frontal region and to the SPF displacement. An anticyclonic inter-gyre gyre is related to negative WSC and LSW anomalies and to a SPF north of its climatological position, indicating an expanding STG. A cyclonic inter-gyre gyre is related to positive WSC and LSW anomalies and a SPF south of its climatological position, indicating an expanding SPG. Therefore, the mean latitudinal position of the SPF in the NFB (a “SPF index”) could be an indicator of the amount of LSW in the inter-gyre region. Spreading of LSW anomalies intensifies the MOC, suggesting our SPF index as predictor of the MOC intensity at multi-decadal time scales. The meridional displacement of the SPF has a pronounced influence on the meridional heat transport, both on its gyre and overturning components. Article in Journal/Newspaper Labrador Sea Newfoundland north atlantic current North Atlantic OpenAgrar (OA) Ocean Science 8 1 91 102 |
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article Text Nunez-Riboni, Ismael Bersch, Manfred Haak, Helmuth Jungclaus, Johann H. Lohmann, Katja A multi-decadal meridional displacement of the Subpolar Front in the Newfoundland Basin |
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article Text |
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Observations since the 1950s show a multidecadal cycle of a meridional displacement of the Subpolar Front (SPF) in the Newfoundland Basin (NFB) in the North Atlantic. The SPF displacement is associated with corresponding variations in the path of the North Atlantic Current. We use the ocean general circulation model MPIOM with enhanced horizontal and vertical resolutions and forced with NCEP/NCAR reanalysis data to study the relation of the SPF displacement to atmospheric forcing, intensities of the subpolar gyre (SPG) and Meridional Overturning Circulation (MOC), and Labrador Sea Water (LSW) volume. The simulations indicate that the SPF displacement is associated with a circulation anomaly between the SPG and the subtropical gyre (STG), an inter-gyre gyre with a multidecadal time scale. A sensitivity experiment indicates that both wind stress curl (WSC) and heat fluxes (which match LSW changes) contribute to the circulation anomalies in the frontal region and to the SPF displacement. An anticyclonic inter-gyre gyre is related to negative WSC and LSW anomalies and to a SPF north of its climatological position, indicating an expanding STG. A cyclonic inter-gyre gyre is related to positive WSC and LSW anomalies and a SPF south of its climatological position, indicating an expanding SPG. Therefore, the mean latitudinal position of the SPF in the NFB (a “SPF index”) could be an indicator of the amount of LSW in the inter-gyre region. Spreading of LSW anomalies intensifies the MOC, suggesting our SPF index as predictor of the MOC intensity at multi-decadal time scales. The meridional displacement of the SPF has a pronounced influence on the meridional heat transport, both on its gyre and overturning components. |
format |
Article in Journal/Newspaper |
author |
Nunez-Riboni, Ismael Bersch, Manfred Haak, Helmuth Jungclaus, Johann H. Lohmann, Katja |
author_facet |
Nunez-Riboni, Ismael Bersch, Manfred Haak, Helmuth Jungclaus, Johann H. Lohmann, Katja |
author_sort |
Nunez-Riboni, Ismael |
title |
A multi-decadal meridional displacement of the Subpolar Front in the Newfoundland Basin |
title_short |
A multi-decadal meridional displacement of the Subpolar Front in the Newfoundland Basin |
title_full |
A multi-decadal meridional displacement of the Subpolar Front in the Newfoundland Basin |
title_fullStr |
A multi-decadal meridional displacement of the Subpolar Front in the Newfoundland Basin |
title_full_unstemmed |
A multi-decadal meridional displacement of the Subpolar Front in the Newfoundland Basin |
title_sort |
multi-decadal meridional displacement of the subpolar front in the newfoundland basin |
publishDate |
2012 |
url |
https://doi.org/10.5194/os-8-91-2012 https://www.openagrar.de/receive/timport_mods_00037474 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00037474/dn050012.pdf |
genre |
Labrador Sea Newfoundland north atlantic current North Atlantic |
genre_facet |
Labrador Sea Newfoundland north atlantic current North Atlantic |
op_relation |
Ocean science : OS -- OceanSci. -- 1812-0784 -- 2212788-4 https://doi.org/10.5194/os-8-91-2012 https://www.openagrar.de/receive/timport_mods_00037474 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00037474/dn050012.pdf |
op_rights |
only signed in user info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.5194/os-8-91-2012 |
container_title |
Ocean Science |
container_volume |
8 |
container_issue |
1 |
container_start_page |
91 |
op_container_end_page |
102 |
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1810455308665880576 |