Mean flow stability in a model of the eastern North Pacific ocean
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Nacional Autónoma de México
1998
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| _version_ | 1876477423925592064 |
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| author | Guillermo Auad |
| author_facet | Guillermo Auad |
| contents | Mean flow stability in a model of the eastern North Pacific ocean Guillermo Auad Alejandro Parés Sierra Ciencias de la Tierra stability Rossby waves numerical model California Current Mean flow and stratification data obtained from an eight-layer quasigeostrophic model of the California Current System are usedto feed a linearized model, from which a stability problem is solved. Frequencies, phase speeds, group velocities, growth rates andvertical structures are obtained after solving a complex eigenvalue problem. Seven runs are implemented to study the role played bydifferent vertical boundary conditions (flat and sloping bottom), mean flow direction and amplitude, latitude and frictional mechanismson the Rossby wave characteristics. For values used of buoyancy frequency as found in the Northeastern Pacific, the verticalresolution is crucial in determining the effects of bottom topography and bottom friction on stability of the basic flow. The verticalstructure of the mean flow has an important effect on the determination of the e-folding-time. The e-folding times of different areas inthe California Current System region range from 144 to 374 days for the most unstable waves, as found by other authors usingdifferent data and models. The vertical structure of our wave solutions (amplitudes and phases) are noticeably affected by dissipation.The first baroclinic mode stable waves show a good qualitative and quantitative agreement with those obtained from hydrographicdata for the California Current by Kang et al. (1982). The inclusion of bottom topography leads to a moderate redistribution offrequencies in the wavenumber space and to higher group velocities. 1998 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56837206 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.2 Vol.37 |
| format | Artículo científico |
| id | redalyc_56837206 |
| institution | Redalyc |
| language | en |
| publishDate | 1998 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Mean flow stability in a model of the eastern North Pacific ocean Guillermo Auad Ciencias de la Tierra stability Rossby waves numerical model California Current Mean flow stability in a model of the eastern North Pacific ocean Guillermo Auad Alejandro Parés Sierra Ciencias de la Tierra stability Rossby waves numerical model California Current Mean flow and stratification data obtained from an eight-layer quasigeostrophic model of the California Current System are usedto feed a linearized model, from which a stability problem is solved. Frequencies, phase speeds, group velocities, growth rates andvertical structures are obtained after solving a complex eigenvalue problem. Seven runs are implemented to study the role played bydifferent vertical boundary conditions (flat and sloping bottom), mean flow direction and amplitude, latitude and frictional mechanismson the Rossby wave characteristics. For values used of buoyancy frequency as found in the Northeastern Pacific, the verticalresolution is crucial in determining the effects of bottom topography and bottom friction on stability of the basic flow. The verticalstructure of the mean flow has an important effect on the determination of the e-folding-time. The e-folding times of different areas inthe California Current System region range from 144 to 374 days for the most unstable waves, as found by other authors usingdifferent data and models. The vertical structure of our wave solutions (amplitudes and phases) are noticeably affected by dissipation.The first baroclinic mode stable waves show a good qualitative and quantitative agreement with those obtained from hydrographicdata for the California Current by Kang et al. (1982). The inclusion of bottom topography leads to a moderate redistribution offrequencies in the wavenumber space and to higher group velocities. 1998 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56837206 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.2 Vol.37 |
| title | Mean flow stability in a model of the eastern North Pacific ocean |
| topic | Ciencias de la Tierra stability Rossby waves numerical model California Current |
| url | https://www.redalyc.org/articulo.oa?id=56837206 |