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Reflection of equatorial Kelvin waves at eastern ocean boundaries Part I: hypothetical boundaries

Reflection of equatorial Kelvin waves at eastern ocean boundaries Part I: hypothetical boundaries
Reflection of equatorial Kelvin waves at eastern ocean boundaries Part I: hypothetical boundaries
A baroclinic shallow-water model is developed to investigate the effect of the orientation of the eastern ocean boundary on the behavior of equatorial Kelvin waves. The model is formulated in a spherical polar coordinate system and includes dissipation and non-linear terms, effects which have not been previously included in analytical approaches to the problem. Both equatorial and middle latitude response are considered given the large latitudinal extent used in the model. Baroclinic equatorial Kelvin waves of intraseasonal, seasonal and annual periods are introduced into the domain as pulses of finite width. Their subsequent reflection, transmission and dissipation are investigated. It is found that dissipation is very important for the transmission of wave energy along the boundary and for reflections from the boundary. The dissipation was found to be dependent not only on the presence of the coastal Kelvin waves in the domain, but also on the period of these coastal waves. In particular the dissipation increases with wave period. It is also shown that the equatorial ?-plane approximation can allow an anomalous generation of Rossby waves at higher latitudes. Nonlinearities generally have a small effect on the solutions, within the confines of this model.
0992-7689
812-826
Soares, J.
4ed5ba43-e53e-40be-ab6b-0d4f8c6ea7ec
Wainer, I.
83ef665a-b7f1-4322-bde0-631fa6a48dd3
Wells, N.C.
4c27167c-f972-4822-9614-d6ca8d8223b5
Soares, J.
4ed5ba43-e53e-40be-ab6b-0d4f8c6ea7ec
Wainer, I.
83ef665a-b7f1-4322-bde0-631fa6a48dd3
Wells, N.C.
4c27167c-f972-4822-9614-d6ca8d8223b5

Soares, J., Wainer, I. and Wells, N.C. (1999) Reflection of equatorial Kelvin waves at eastern ocean boundaries Part I: hypothetical boundaries. Annales Geophysicae, 17 (6), 812-826. (doi:10.1007/s00585-999-0812-z).

Record type: Article

Abstract

A baroclinic shallow-water model is developed to investigate the effect of the orientation of the eastern ocean boundary on the behavior of equatorial Kelvin waves. The model is formulated in a spherical polar coordinate system and includes dissipation and non-linear terms, effects which have not been previously included in analytical approaches to the problem. Both equatorial and middle latitude response are considered given the large latitudinal extent used in the model. Baroclinic equatorial Kelvin waves of intraseasonal, seasonal and annual periods are introduced into the domain as pulses of finite width. Their subsequent reflection, transmission and dissipation are investigated. It is found that dissipation is very important for the transmission of wave energy along the boundary and for reflections from the boundary. The dissipation was found to be dependent not only on the presence of the coastal Kelvin waves in the domain, but also on the period of these coastal waves. In particular the dissipation increases with wave period. It is also shown that the equatorial ?-plane approximation can allow an anomalous generation of Rossby waves at higher latitudes. Nonlinearities generally have a small effect on the solutions, within the confines of this model.

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Published date: June 1999
Organisations: Physical Oceanography

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Local EPrints ID: 360518
URI: http://eprints.soton.ac.uk/id/eprint/360518
ISSN: 0992-7689
PURE UUID: 0ceecd0f-778a-4255-bf15-2f545db4c185

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Date deposited: 11 Dec 2013 16:45
Last modified: 14 Mar 2024 15:39

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Contributors

Author: J. Soares
Author: I. Wainer
Author: N.C. Wells

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