Eddy Train Encounters with a Continental Boundary: A South Atlantic Case Study
Satellite altimetry suggests that large anticyclonic eddies (rings) originating from the Agulhas Current retroflection occasionally make their way across the entire South Atlantic Ocean. What happens when these rings encounter a western boundary current? In this work, interactions between a "tr...
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ftunivfurg:oai:repositorio.furg.br:1/3716 2023-11-12T04:26:13+01:00 Eddy Train Encounters with a Continental Boundary: A South Atlantic Case Study Azevedo, José Luiz Lima de Nof, Doron Mata, Mauricio Magalhães 2012 application/pdf http://repositorio.furg.br/handle/1/3716 eng eng AZEVEDO, José Luiz Lima de; NOF, Doron; MATA, Maurício Magalhães. Eddy Train Encounters with a Continental Boundary: A South Atlantic Case Study. Journal of Physical Oceanography, p. 1-57, 2012. Disponível em:<http://doronnof.net/files/AzevedoRevText.pdf>. Acesso em: 27 jun. 2012. 1520-0485 0022-3670 http://repositorio.furg.br/handle/1/3716 open access article 2012 ftunivfurg 2023-10-24T20:59:12Z Satellite altimetry suggests that large anticyclonic eddies (rings) originating from the Agulhas Current retroflection occasionally make their way across the entire South Atlantic Ocean. What happens when these rings encounter a western boundary current? In this work, interactions between a "train" of nonlinear lens-like eddies and a Southern Hemisphere continental boundary are investigated analytically and numerically on a β plane. The train of eddies is modeled as a steady double-frontal zonal current with the same vorticity and transport as the eddies themselves. The continental boundary is represented by a vertical wall, which is purely meridional in one case and is tilted with respect to the north in another case. It is demonstrated analytically that the eddy–wall encounter produces an equatorward flow parallel to the continental wall, thus suggesting a weakening of the transport of the associated (poleward-flowing) western boundary current upstream of the encounter zone and unchanged transport downstream. A large stationary eddy is established in the contact zone because itsβ-induced force is necessary to balance the other forces along the wall. The size of this edd is directly proportional to the transport of the eddy train and the meridional tilt of the wall. These scenarios are in good agreement with results obtained numerically using an isopycnal Bleck and Boudra model. Article in Journal/Newspaper South Atlantic Ocean RI FURG (Repositório da Universidade Federal do Rio Grande) |
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RI FURG (Repositório da Universidade Federal do Rio Grande) |
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English |
description |
Satellite altimetry suggests that large anticyclonic eddies (rings) originating from the Agulhas Current retroflection occasionally make their way across the entire South Atlantic Ocean. What happens when these rings encounter a western boundary current? In this work, interactions between a "train" of nonlinear lens-like eddies and a Southern Hemisphere continental boundary are investigated analytically and numerically on a β plane. The train of eddies is modeled as a steady double-frontal zonal current with the same vorticity and transport as the eddies themselves. The continental boundary is represented by a vertical wall, which is purely meridional in one case and is tilted with respect to the north in another case. It is demonstrated analytically that the eddy–wall encounter produces an equatorward flow parallel to the continental wall, thus suggesting a weakening of the transport of the associated (poleward-flowing) western boundary current upstream of the encounter zone and unchanged transport downstream. A large stationary eddy is established in the contact zone because itsβ-induced force is necessary to balance the other forces along the wall. The size of this edd is directly proportional to the transport of the eddy train and the meridional tilt of the wall. These scenarios are in good agreement with results obtained numerically using an isopycnal Bleck and Boudra model. |
format |
Article in Journal/Newspaper |
author |
Azevedo, José Luiz Lima de Nof, Doron Mata, Mauricio Magalhães |
spellingShingle |
Azevedo, José Luiz Lima de Nof, Doron Mata, Mauricio Magalhães Eddy Train Encounters with a Continental Boundary: A South Atlantic Case Study |
author_facet |
Azevedo, José Luiz Lima de Nof, Doron Mata, Mauricio Magalhães |
author_sort |
Azevedo, José Luiz Lima de |
title |
Eddy Train Encounters with a Continental Boundary: A South Atlantic Case Study |
title_short |
Eddy Train Encounters with a Continental Boundary: A South Atlantic Case Study |
title_full |
Eddy Train Encounters with a Continental Boundary: A South Atlantic Case Study |
title_fullStr |
Eddy Train Encounters with a Continental Boundary: A South Atlantic Case Study |
title_full_unstemmed |
Eddy Train Encounters with a Continental Boundary: A South Atlantic Case Study |
title_sort |
eddy train encounters with a continental boundary: a south atlantic case study |
publishDate |
2012 |
url |
http://repositorio.furg.br/handle/1/3716 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
AZEVEDO, José Luiz Lima de; NOF, Doron; MATA, Maurício Magalhães. Eddy Train Encounters with a Continental Boundary: A South Atlantic Case Study. Journal of Physical Oceanography, p. 1-57, 2012. Disponível em:<http://doronnof.net/files/AzevedoRevText.pdf>. Acesso em: 27 jun. 2012. 1520-0485 0022-3670 http://repositorio.furg.br/handle/1/3716 |
op_rights |
open access |
_version_ |
1782340279176527872 |