| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Generation of submesoscale frontal eddies in the Agulhas Current
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| Autores: |
Tedesco, Pauline
Gula, Jonathan
Ménesguen, Claire
Penven, Pierrick
Krug, M.
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| Data: |
2019-11
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| Ano: |
2019
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| Palavras-chave: |
Submesoscale
Numerical Modelling
Barotropic Instability
Agulhas Current
Frontal Eddies
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| Resumo: |
This study addresses the dynamics of the Agulhas inshore front in the submesoscale range upstream of 26°E. Submesoscale frontal eddies are observed in the vicinity of Port Elizabeth (26°E) from satellite images and in observations collected from under‐water gliders. Using a submesoscale‐resolving numerical model (dx ~ 0.75 km) we are able to simulate similar submesoscale eddies. Barotropic instability is confirmed as the generation mechanism by a 1D linear stability analysis and an eddy kinetic energy budget. Kinetic energy is transferred from the mean flow to the eddies through the mean horizontal shear, which is a signature of barotropic instability. When the Agulhas Current is in a non‐meandering state, submesoscale eddy generation is a recurrent process which locally drives the front's variability. Along the front, the spatial variability of barotropic instability is shaped by the background strain. A large strain aligned with the frontal axis intensifies the frontal shear upstream of 28°E while a weakening of the strain allows for barotropic instability to be triggered downstream. Although an intermittent process, the barotropic instability shows a dominant period of variability comparable with the variability of the Agulhas Current and Undercurrent.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00514/62520/66827.pdf
DOI:10.1029/2019JC015229
https://archimer.ifremer.fr/doc/00514/62520/
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| Editor: |
American Geophysical Union (AGU)
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| Formato: |
application/pdf
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| Fonte: |
Journal Of Geophysical Research-oceans (2169-9275) (American Geophysical Union (AGU)), 2019-11 , Vol. 124 , N. 11 , P. 7606-7625
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| Direitos: |
info:eu-repo/semantics/openAccess
restricted use
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