Barotropic background currents in the Gulf of California

Barotropic background currents in the Gulf of California

 A field of barotropic background currents (BC) in the Gulf of California is constructed numerically. The definition of BC used here is based on suppositions about (i) the horizontal homogenization of potential vorticity in large-scale gyres, and (ii) the tendency of a current structure to...

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Autores principales: Makarov, V, Jiménez-Illescas, A
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2003
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/149
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id oai:cienciasmarinas.com.mx:article-149
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Makarov, V
Jiménez-Illescas, A
spellingShingle Makarov, V
Jiménez-Illescas, A
Barotropic background currents in the Gulf of California
author_facet Makarov, V
Jiménez-Illescas, A
author_sort Makarov, V
title Barotropic background currents in the Gulf of California
title_short Barotropic background currents in the Gulf of California
title_full Barotropic background currents in the Gulf of California
title_fullStr Barotropic background currents in the Gulf of California
title_full_unstemmed Barotropic background currents in the Gulf of California
title_sort barotropic background currents in the gulf of california
description  A field of barotropic background currents (BC) in the Gulf of California is constructed numerically. The definition of BC used here is based on suppositions about (i) the horizontal homogenization of potential vorticity in large-scale gyres, and (ii) the tendency of a current structure to evolve to a state with a minimum of system mechanical energy. In the barotropic case here, the numerical algorithm is reduced to the solution of the Dirichlet boundary problems for planetary, topographic and flowing integral streamfunction components separately. The results obtained are compared to observations and the results of other numerical models. The calculated barotropic BC realistically describe the main features of the circulation in the southern part of the Gulf of California, including its mouth. Cyclonic movement in the deep-water and anticyclonic movement near the coasts are observed. The numerical results for the central and northern parts of the gulf, where seasonal climatological differences are pronounced, coincide with observations in the upper layer only during the winter season; i.e., the circulation here is anticyclonic. Thus, there are reasons to suggest that mainly planetary-topographic forcing, especially in the southern part, forms the circulation in the lower layer. The seasonal variability of currents in the upper layer caused by non-stationary effects such as wind, heat flux and baroclinicity, is apparently in phase with these mechanisms during winter, and in antiphase during summer, particularly for the central and northern gulf.
publisher Iniversidad Autónoma de Baja California
publishDate 2003
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/149
_version_ 1715723936191217664
spelling oai:cienciasmarinas.com.mx:article-1492019-04-25T22:15:59Z Barotropic background currents in the Gulf of California Corrientes básicas barotrópicas en el Golfo de California Makarov, V Jiménez-Illescas, A Gulf of California background currents potential vorticity barotropic model planetary-topographic forcing Golfo de California corrientes básicas vorticidad potencial modelo barotrópico forzamiento planetario-topográfico  A field of barotropic background currents (BC) in the Gulf of California is constructed numerically. The definition of BC used here is based on suppositions about (i) the horizontal homogenization of potential vorticity in large-scale gyres, and (ii) the tendency of a current structure to evolve to a state with a minimum of system mechanical energy. In the barotropic case here, the numerical algorithm is reduced to the solution of the Dirichlet boundary problems for planetary, topographic and flowing integral streamfunction components separately. The results obtained are compared to observations and the results of other numerical models. The calculated barotropic BC realistically describe the main features of the circulation in the southern part of the Gulf of California, including its mouth. Cyclonic movement in the deep-water and anticyclonic movement near the coasts are observed. The numerical results for the central and northern parts of the gulf, where seasonal climatological differences are pronounced, coincide with observations in the upper layer only during the winter season; i.e., the circulation here is anticyclonic. Thus, there are reasons to suggest that mainly planetary-topographic forcing, especially in the southern part, forms the circulation in the lower layer. The seasonal variability of currents in the upper layer caused by non-stationary effects such as wind, heat flux and baroclinicity, is apparently in phase with these mechanisms during winter, and in antiphase during summer, particularly for the central and northern gulf. Un campo de corrientes básicas (CB) barotrópicas en el Golfo de California se construyó numéricamente. La definición de CB utilizada aquí se basa en las suposiciones sobre (i) la homogeneización horizontal de vorticidad potencial en los giros de macroescala y (ii) la tendencia de la estructura de las corrientes a evolucionar hacia un estado con un mínimo de energía mecánica del sistema. En un caso barotrópico el algoritmo numérico se reduce a la solución, separadamente, de los problemas de frontera de Dirichlet para las componentes topográfica, planetaria y de flujo de la función integral de corriente. Los resultados obtenidos se compararon con las observaciones y con los resultados de otros modelos numéricos. Las CB barotrópicas calculadas describen, de una manera realista, las características principales de la circulación en la parte sur del Golfo de California, incluyendo su boca. Se ha observado aquí un movimiento ciclónico en agua profunda y un movimiento anticiclónico cerca de ambas costas. Los resultados numéricos para las partes central y norte del golfo, donde las diferencias climatológicas estacionales son pronunciadas, coinciden con las observaciones en la capa superior solamente durante la estación de invierno; i.e., la circulación aquí es anticiclónica. Por tanto, hay razones para sugerir que principalmente el forzamiento topográfico-planetario, especialmente en la parte sur, forma la circulación en la capa inferior. La variabilidad estacional de las corrientes en la capa superior, causada por efectos no estacionarios tales como el viento, el flujo de calor y la baroclinicidad, aparentemente está en fase con estos mecanismos durante el invierno y está en antifase durante el verano, particularmente para la parte central y norte del golfo. Iniversidad Autónoma de Baja California 2003-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/149 10.7773/cm.v29i2.149 Ciencias Marinas; Vol. 29 No. 2 (2003); 141-153 Ciencias Marinas; Vol. 29 Núm. 2 (2003); 141-153 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/149/125

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