Remote and local forcing of Rossby wave variability in the midlatitude Pacific Ocean

A reduced-gravity model is used to investigate the low-frequency variability in the eastern mid-latitude Pacific Ocean. The domain covers the eastern North Pacific from 18°N to 500N and from 1550W to the North American coast. In a first experiment the model is forced by the wind stress from COADS. A...

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Detalles Bibliográficos
Autor: Parés Sierra, A.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:1991
País:México
Institución:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
Repositorio:Geofísica Internacional
Idioma:español
OAI Identifier:oai:revistagi.geofisica.unam.mx:article/1220
Acceso en línea:http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1220
Access Level:acceso abierto
Palabra clave:Ondas de Rossby
Latitud crítica
Rossby Waves
Critical latitude
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spelling Remote and local forcing of Rossby wave variability in the midlatitude Pacific OceanRemote and local forcing of Rossby wave variability in the midlatitude Pacific OceanParés Sierra, A.Ondas de RossbyLatitud críticaRossby WavesCritical latitudeA reduced-gravity model is used to investigate the low-frequency variability in the eastern mid-latitude Pacific Ocean. The domain covers the eastern North Pacific from 18°N to 500N and from 1550W to the North American coast. In a first experiment the model is forced by the wind stress from COADS. A second experiment consists in forcing the model from its southern boundary using the results of an equatorial reduced-gravity model. The wavenumber-frequency spectrum calculated from the model is consistent with observations. Most of the calculated low-frequency variability in the ocean interior is in the form of westward propagating Rossby waves. Investigation in the wavenumber-frequency domain shows that either mechanism (locally wind-forced and remotely forced coastal disturbances) is capable of generating the westward-traveling waves that determine the ocean interior variability. For the locally forced model a critical latitude at about 350N is observed. The disturbances in the region north and south of this latitude present a clear dichotomy in their propagating characteristics: a strong off-shore decaying factor to the north and off-shore propagation to the south.Un modelo de gravedad reducida se utilizó para investigar la variabilidad de baja frecuencia en el Pacífico Nororiental. El dominio del modelo abarca desde los 180N hasta los 500N y desde 15500 hasta la costa oeste de Norteamérica. En un primer experimento. el modelo es forzado por el esfuerzo del viento (COADS). Un segundo experimento consiste en forzar el modelo a través de su frontera austral usando los resultados de un modelo ecuatorial de gravedad reducida. Encontramos que los espectros de numero de onda-frecuencia calculados a partir de los resultados de nuestro modelo son congruentes con los calculados a partir de observaciones. La mayor parte de la energía de baja frecuencia en el interior del océano modelado consiste en ondas de Rossby propagándose hacia el oeste. El análisis de la respuesta del modelo a los dos forzamientos (forzamiento local por el viento y forzamiento remoto a través de la frontera) nos muestra que ambos mecanismos son capaces de generar el tipo de ondas que determina la variabilidad en el interior del océano. En los resultados del modelo forzado por el viento se observa la existencia de una latitud critica alrededor de los 350 N. La respuesta del modelo al norte y sur de esta latitud es marcadamente diferente, principalmente en cuanto a las características de propagación de las ondas predominantes: se observa un fuerte componente de decaimiento al norte y de propagación al sur de dicha latitud.Universidad Nacional Autónoma de México. Instituto de Geofísica1991-07-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://revistagi.geofisica.unam.mx/index.php/RGI/article/view/122010.22201/igeof.00167169p.1991.30.3.598Geofisica Internacional; Vol. 30 No. 3 (1991): July 1, 1991; 121-134Geofísica Internacional; Vol. 30 Núm. 3 (1991): Julio 1, 1991; 121-1342954-436X0016-716910.22201/igeof.00167169p.1991.30.3reponame:Geofísica Internacionalinstname:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICOinstacron:UNAMspahttp://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1220/1163https://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:revistagi.geofisica.unam.mx:article/12202024-08-16T17:32:06Z
dc.title.none.fl_str_mv Remote and local forcing of Rossby wave variability in the midlatitude Pacific Ocean
Remote and local forcing of Rossby wave variability in the midlatitude Pacific Ocean
title Remote and local forcing of Rossby wave variability in the midlatitude Pacific Ocean
spellingShingle Remote and local forcing of Rossby wave variability in the midlatitude Pacific Ocean
Parés Sierra, A.
Ondas de Rossby
Latitud crítica
Rossby Waves
Critical latitude
title_short Remote and local forcing of Rossby wave variability in the midlatitude Pacific Ocean
title_full Remote and local forcing of Rossby wave variability in the midlatitude Pacific Ocean
title_fullStr Remote and local forcing of Rossby wave variability in the midlatitude Pacific Ocean
title_full_unstemmed Remote and local forcing of Rossby wave variability in the midlatitude Pacific Ocean
title_sort Remote and local forcing of Rossby wave variability in the midlatitude Pacific Ocean
dc.creator.none.fl_str_mv Parés Sierra, A.
author Parés Sierra, A.
author_facet Parés Sierra, A.
author_role author
dc.subject.none.fl_str_mv Ondas de Rossby
Latitud crítica
Rossby Waves
Critical latitude
topic Ondas de Rossby
Latitud crítica
Rossby Waves
Critical latitude
description A reduced-gravity model is used to investigate the low-frequency variability in the eastern mid-latitude Pacific Ocean. The domain covers the eastern North Pacific from 18°N to 500N and from 1550W to the North American coast. In a first experiment the model is forced by the wind stress from COADS. A second experiment consists in forcing the model from its southern boundary using the results of an equatorial reduced-gravity model. The wavenumber-frequency spectrum calculated from the model is consistent with observations. Most of the calculated low-frequency variability in the ocean interior is in the form of westward propagating Rossby waves. Investigation in the wavenumber-frequency domain shows that either mechanism (locally wind-forced and remotely forced coastal disturbances) is capable of generating the westward-traveling waves that determine the ocean interior variability. For the locally forced model a critical latitude at about 350N is observed. The disturbances in the region north and south of this latitude present a clear dichotomy in their propagating characteristics: a strong off-shore decaying factor to the north and off-shore propagation to the south.
publishDate 1991
dc.date.none.fl_str_mv 1991-07-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1220
10.22201/igeof.00167169p.1991.30.3.598
url http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1220
identifier_str_mv 10.22201/igeof.00167169p.1991.30.3.598
dc.language.none.fl_str_mv spa
language spa
dc.relation.none.fl_str_mv http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1220/1163
dc.rights.none.fl_str_mv https://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad Nacional Autónoma de México. Instituto de Geofísica
publisher.none.fl_str_mv Universidad Nacional Autónoma de México. Instituto de Geofísica
dc.source.none.fl_str_mv Geofisica Internacional; Vol. 30 No. 3 (1991): July 1, 1991; 121-134
Geofísica Internacional; Vol. 30 Núm. 3 (1991): Julio 1, 1991; 121-134
2954-436X
0016-7169
10.22201/igeof.00167169p.1991.30.3
reponame:Geofísica Internacional
instname:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
instacron:UNAM
instname_str UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
instacron_str UNAM
institution UNAM
reponame_str Geofísica Internacional
collection Geofísica Internacional
repository.name.fl_str_mv
repository.mail.fl_str_mv
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