General circulation and intergyre dynamics in the eastern North Atlantic from a regional primitive equation model
The mean circulation of the eastern North Atlantic is investigated using a regional 0.8° × cos(latitude)‐resolution configuration of the SPEM primitive equation sigma coordinate model, forced by seasonal and monthly surface fluxes. The computational domain is surrounded by three self‐adapting open b...
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ftccsdartic:oai:HAL:hal-00182328v1 2023-05-15T17:25:18+02:00 General circulation and intergyre dynamics in the eastern North Atlantic from a regional primitive equation model Penduff, Thierry Colin De Verdiere, Alain Barnier, Bernard Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF) 2001 https://hal.archives-ouvertes.fr/hal-00182328 https://doi.org/10.1029/2000JC000346 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2000JC000346 hal-00182328 https://hal.archives-ouvertes.fr/hal-00182328 doi:10.1029/2000JC000346 http://creativecommons.org/licenses/by/ ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.archives-ouvertes.fr/hal-00182328 Journal of Geophysical Research, American Geophysical Union, 2001, 106 (C10), pp.22313-22329. ⟨10.1029/2000JC000346⟩ [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] info:eu-repo/semantics/article Journal articles 2001 ftccsdartic https://doi.org/10.1029/2000JC000346 2021-10-24T21:47:22Z The mean circulation of the eastern North Atlantic is investigated using a regional 0.8° × cos(latitude)‐resolution configuration of the SPEM primitive equation sigma coordinate model, forced by seasonal and monthly surface fluxes. The computational domain is surrounded by three self‐adapting open boundaries which evacuate the outgoing perturbations and laterally control the baroclinic modes in inflow regions, but let the model adjust the barotropic mode to a large extent. The final solution is stable and reproduces most features of the basin's mean circulation well: A realistic Azores Current, the observed paths and transports of subpolar currents, of the branches of the North Atlantic Current, of the intergyre zone modal and intermediate water masses down to about 2000 m. Some unrealistic circulation features, attributed to the modest resolution and to certain limitations of the sigma coordinates, are found below 2000 m. The buoyancy and vorticity balances are investigated in the intergyre zone. The Subpolar Mode Water (SPMW), subducted at a realistic rate, continues its southward journey toward the ocean's interior in accordance with the ventilated thermocline theory, with eddy diapycnal fluxes exerting a moderating effect. The poleward motion observed between 300 and 1000 m is well reproduced north of 45°N and governed by similar dynamics, but is absent south of 45°N within the upper Mediterranean Water. Article in Journal/Newspaper north atlantic current North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Journal of Geophysical Research: Oceans 106 C10 22313 22329 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] |
spellingShingle |
[PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] Penduff, Thierry Colin De Verdiere, Alain Barnier, Bernard General circulation and intergyre dynamics in the eastern North Atlantic from a regional primitive equation model |
topic_facet |
[PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] |
description |
The mean circulation of the eastern North Atlantic is investigated using a regional 0.8° × cos(latitude)‐resolution configuration of the SPEM primitive equation sigma coordinate model, forced by seasonal and monthly surface fluxes. The computational domain is surrounded by three self‐adapting open boundaries which evacuate the outgoing perturbations and laterally control the baroclinic modes in inflow regions, but let the model adjust the barotropic mode to a large extent. The final solution is stable and reproduces most features of the basin's mean circulation well: A realistic Azores Current, the observed paths and transports of subpolar currents, of the branches of the North Atlantic Current, of the intergyre zone modal and intermediate water masses down to about 2000 m. Some unrealistic circulation features, attributed to the modest resolution and to certain limitations of the sigma coordinates, are found below 2000 m. The buoyancy and vorticity balances are investigated in the intergyre zone. The Subpolar Mode Water (SPMW), subducted at a realistic rate, continues its southward journey toward the ocean's interior in accordance with the ventilated thermocline theory, with eddy diapycnal fluxes exerting a moderating effect. The poleward motion observed between 300 and 1000 m is well reproduced north of 45°N and governed by similar dynamics, but is absent south of 45°N within the upper Mediterranean Water. |
author2 |
Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF) |
format |
Article in Journal/Newspaper |
author |
Penduff, Thierry Colin De Verdiere, Alain Barnier, Bernard |
author_facet |
Penduff, Thierry Colin De Verdiere, Alain Barnier, Bernard |
author_sort |
Penduff, Thierry |
title |
General circulation and intergyre dynamics in the eastern North Atlantic from a regional primitive equation model |
title_short |
General circulation and intergyre dynamics in the eastern North Atlantic from a regional primitive equation model |
title_full |
General circulation and intergyre dynamics in the eastern North Atlantic from a regional primitive equation model |
title_fullStr |
General circulation and intergyre dynamics in the eastern North Atlantic from a regional primitive equation model |
title_full_unstemmed |
General circulation and intergyre dynamics in the eastern North Atlantic from a regional primitive equation model |
title_sort |
general circulation and intergyre dynamics in the eastern north atlantic from a regional primitive equation model |
publisher |
HAL CCSD |
publishDate |
2001 |
url |
https://hal.archives-ouvertes.fr/hal-00182328 https://doi.org/10.1029/2000JC000346 |
genre |
north atlantic current North Atlantic |
genre_facet |
north atlantic current North Atlantic |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.archives-ouvertes.fr/hal-00182328 Journal of Geophysical Research, American Geophysical Union, 2001, 106 (C10), pp.22313-22329. ⟨10.1029/2000JC000346⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2000JC000346 hal-00182328 https://hal.archives-ouvertes.fr/hal-00182328 doi:10.1029/2000JC000346 |
op_rights |
http://creativecommons.org/licenses/by/ |
op_doi |
https://doi.org/10.1029/2000JC000346 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
106 |
container_issue |
C10 |
container_start_page |
22313 |
op_container_end_page |
22329 |
_version_ |
1766116702033018880 |