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Energy Transmission by Barotropic Rossby Waves Revisited Public Deposited

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  • This article presents a semianalytic method to investigate the properties of energy transmission across bottom topography by barotropic Rossby waves. The method is first used to revisit 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 results 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 energy transmission properties of a cross section of the Mid-Atlantic Ridge. It is shown that the filtering characteristics 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 topographies narrower than ~400 km (e.g., peaks) are high-pass filters of incoming waves, while topographies wider than that (e.g., cross-section envelopes) are low-pass filters. In the particular case of the Mid-Atlantic Ridge the neglect of the contribution of individual peaks leads to an erroneous estimate of the filtering properties of the massif.
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  • Matano, R. P., E. D. Palma, 2005: Energy Transmission by Barotropic Rossby Waves Revisited. J. Phys. Oceanogr., 35, 2228–2236.
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  • The work of R. Matano was supported by NSF Grant OCE 0118363, NASA Grant NAG512378, and JPL Contract 1206714. Author E. D. Palma was supported by grants from CONICET (PIP-6138) and from Universidad Nacional del Sur (24/F036).
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  • Journal of Physical Oceanography
  • Vol. 35, No. 11
  • description.provenance : Made available in DSpace on 2012-01-26T16:39:30Z (GMT). No. of bitstreams: 1 MatanoRP.CEOAS.EnergyTransmissionBarotropic.pdf: 1009133 bytes, checksum: 2932ffdfbb045439f4d8e5326a15881b (MD5) Previous issue date: 2005-11
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