Energy transmission by barotropic Rossby waves revisited
This article presents a semianalytic method to investigate the propertie s of energy transmission across bottom topography by barotropic Rossby waves. The method is first used to r evisit the analytical estimates derived from wave-matching techniques and Wentzel–Kramers–Brillouin ( WKB) approximatio...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2005 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/29489 |
| Acceso en línea: | http://hdl.handle.net/11336/29489 |
| Access Level: | acceso abierto |
| Palabra clave: | https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
| Sumario: | This article presents a semianalytic method to investigate the propertie s of energy transmission across bottom topography by barotropic Rossby waves. The method is first used to r evisit the analytical estimates derived from wave-matching techniques and Wentzel–Kramers–Brillouin ( WKB) approximations. The comparison between the semianalytic method and WKB indicates that the res ults of the latter are valid for waves with periods longer than a month and ridges taller than 1000 m and wider than 500 km. For these parameter values both methods predict the passage of low-frequency waves and the reflection of high- frequency waves. The semianalytic method is then used to discuss the energ y transmission properties of a cross section of the Mid-Atlantic Ridge. It is shown that the filtering cha racteristics of realistic bottom topographies depend not only on the spatial scale set by the cross-section envelope, but also on the scales of the individual peaks. This dependence is related to the fact that topogr aphies narrower than 400 km (e.g., peaks) are high-pass filters of incoming waves, while topographie s wider than that (e.g., cross-section envelopes) are low-pass filters. In the particular case of the Mid-Atlant ic Ridge the neglect of the contri- bution of individual peaks leads to an erroneous estimate of the filtering properties of the massif. |
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