Barotropic background currents in the Gulf of California

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

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 baroclimicity, is apparently in phase with these mechanisms during winter, and in antiphase during summer, particularly for the central and northern gulf.
Original languageAmerican English
Pages (from-to)141-153
Number of pages125
JournalCiencias Marinas
StatePublished - 1 Jun 2003
Externally publishedYes

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Gulf of California
Vorticity
Coastal zones
Heat flux
Numerical models
winter
homogenization
Water
mouth
seasonal variation
heat
coasts
summer
energy
potential vorticity
heat flux
deep water
water
gulf
coast

Cite this

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title = "Barotropic background currents in the Gulf of California",
abstract = "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 baroclimicity, is apparently in phase with these mechanisms during winter, and in antiphase during summer, particularly for the central and northern gulf.",
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Barotropic background currents in the Gulf of California. / Makarov, Vyacheslav; Jiménez-Illescas, Ángel.

In: Ciencias Marinas, 01.06.2003, p. 141-153.

Research output: Contribution to journalArticle

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