Comparison of near-surface mean and eddy flows from two numerical models of the South Atlantic ocean
The near‐surface mean and eddy flows simulated by two eddy‐permitting models of the South Atlantic (S‐coordinate Primitive Equation Model (SPEM) and Ocean Parallel (OPA) model) are compared. These models are intrinsically different by virtue of their vertical discretizations (σ versus geopotential c...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://hal.science/hal-00182325 https://doi.org/10.1029/2000JC000519 |
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ftunigrenoble:oai:HAL:hal-00182325v1 2024-05-12T07:56:22+00:00 Comparison of near-surface mean and eddy flows from two numerical models of the South Atlantic ocean Penduff, Thierry Barnier, Bernard Béranger, Karine Verron, Jacques Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) 2001 https://hal.science/hal-00182325 https://doi.org/10.1029/2000JC000519 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2000JC000519 hal-00182325 https://hal.science/hal-00182325 doi:10.1029/2000JC000519 http://creativecommons.org/licenses/by/ ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00182325 Journal of Geophysical Research, 2001, 106 (C8), pp.16.857-16.867. ⟨10.1029/2000JC000519⟩ [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 ftunigrenoble https://doi.org/10.1029/2000JC000519 2024-04-18T03:57:35Z The near‐surface mean and eddy flows simulated by two eddy‐permitting models of the South Atlantic (S‐coordinate Primitive Equation Model (SPEM) and Ocean Parallel (OPA) model) are compared. These models are intrinsically different by virtue of their vertical discretizations (σ versus geopotential coordinates, respectively), so that their solutions differ essentially through the representation of current‐topography interactions. The path of the Agulhas Current, the generation process, the characteristics, and the subsequent trajectory of the Agulhas rings are differently affected by topography in the two models. Along the American western boundary, SPEM traps a larger part of the Antarctic Circumpolar Current (ACC) around the Falkland Plateau and consequently produces a stronger Malvinas Current, which overshoots far to the north, inshore of a rather realistic Brazil Current and Confluence regime. In contrast, OPA allows a large part of the ACC to flow across the Scotia Sea, produces a weaker Malvinas Current, traps the Brazil and Malvinas Currents along the American coast, and tends to distort the complex dynamics of the Confluence region and the Zapiola anticyclone. Some of these differences can be attributed to the particularities of each vertical coordinate system and to the representation of topographic slopes (staircases in OPA and facettes in SPEM). More generally, the topographic constraint (trapping of boundary currents and interaction of mean and eddy flows with bathymetry) is stronger in SPEM than in OPA. The topographic smoothing usually performed in sigma coordinate models removes mesoscale topographic roughness and reduces topographic slopes. This treatment is probably responsible for several of the differences observed in the numerical solutions. Article in Journal/Newspaper Antarc* Antarctic Scotia Sea South Atlantic Ocean Université Grenoble Alpes: HAL Antarctic Falkland Plateau ENVELOPE(-50.000,-50.000,-51.000,-51.000) Scotia Sea The Antarctic Zapiola ENVELOPE(-63.567,-63.567,-65.083,-65.083) Journal of Geophysical Research: Oceans 106 C8 16857 16867 |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
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 Barnier, Bernard Béranger, Karine Verron, Jacques Comparison of near-surface mean and eddy flows from two numerical models of the South Atlantic ocean |
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 near‐surface mean and eddy flows simulated by two eddy‐permitting models of the South Atlantic (S‐coordinate Primitive Equation Model (SPEM) and Ocean Parallel (OPA) model) are compared. These models are intrinsically different by virtue of their vertical discretizations (σ versus geopotential coordinates, respectively), so that their solutions differ essentially through the representation of current‐topography interactions. The path of the Agulhas Current, the generation process, the characteristics, and the subsequent trajectory of the Agulhas rings are differently affected by topography in the two models. Along the American western boundary, SPEM traps a larger part of the Antarctic Circumpolar Current (ACC) around the Falkland Plateau and consequently produces a stronger Malvinas Current, which overshoots far to the north, inshore of a rather realistic Brazil Current and Confluence regime. In contrast, OPA allows a large part of the ACC to flow across the Scotia Sea, produces a weaker Malvinas Current, traps the Brazil and Malvinas Currents along the American coast, and tends to distort the complex dynamics of the Confluence region and the Zapiola anticyclone. Some of these differences can be attributed to the particularities of each vertical coordinate system and to the representation of topographic slopes (staircases in OPA and facettes in SPEM). More generally, the topographic constraint (trapping of boundary currents and interaction of mean and eddy flows with bathymetry) is stronger in SPEM than in OPA. The topographic smoothing usually performed in sigma coordinate models removes mesoscale topographic roughness and reduces topographic slopes. This treatment is probably responsible for several of the differences observed in the numerical solutions. |
author2 |
Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Penduff, Thierry Barnier, Bernard Béranger, Karine Verron, Jacques |
author_facet |
Penduff, Thierry Barnier, Bernard Béranger, Karine Verron, Jacques |
author_sort |
Penduff, Thierry |
title |
Comparison of near-surface mean and eddy flows from two numerical models of the South Atlantic ocean |
title_short |
Comparison of near-surface mean and eddy flows from two numerical models of the South Atlantic ocean |
title_full |
Comparison of near-surface mean and eddy flows from two numerical models of the South Atlantic ocean |
title_fullStr |
Comparison of near-surface mean and eddy flows from two numerical models of the South Atlantic ocean |
title_full_unstemmed |
Comparison of near-surface mean and eddy flows from two numerical models of the South Atlantic ocean |
title_sort |
comparison of near-surface mean and eddy flows from two numerical models of the south atlantic ocean |
publisher |
HAL CCSD |
publishDate |
2001 |
url |
https://hal.science/hal-00182325 https://doi.org/10.1029/2000JC000519 |
long_lat |
ENVELOPE(-50.000,-50.000,-51.000,-51.000) ENVELOPE(-63.567,-63.567,-65.083,-65.083) |
geographic |
Antarctic Falkland Plateau Scotia Sea The Antarctic Zapiola |
geographic_facet |
Antarctic Falkland Plateau Scotia Sea The Antarctic Zapiola |
genre |
Antarc* Antarctic Scotia Sea South Atlantic Ocean |
genre_facet |
Antarc* Antarctic Scotia Sea South Atlantic Ocean |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00182325 Journal of Geophysical Research, 2001, 106 (C8), pp.16.857-16.867. ⟨10.1029/2000JC000519⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2000JC000519 hal-00182325 https://hal.science/hal-00182325 doi:10.1029/2000JC000519 |
op_rights |
http://creativecommons.org/licenses/by/ |
op_doi |
https://doi.org/10.1029/2000JC000519 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
106 |
container_issue |
C8 |
container_start_page |
16857 |
op_container_end_page |
16867 |
_version_ |
1798836413320396800 |