On the Effects of Viscous Damping on Equatorial Rossby Waves

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  • 1 Department of Meteorology, Naval Postgraduate School, Monterey, CA, 93940
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Abstract

This work studies the effects of viscosity on the gravest Rossby mode on an equatorial beta plane, using linear damping and cooling coefficients. The results show that the vertical wavelength increased for a given forcing phase speed and that the phase speed is reduced for a given vertical wavelength. In addition, the, viscous damping causes a horizontal tilt of the wave axes resulting in a poleward phase propagation. These results are similar to those obtained by Chang (1977) on Kelvin waves. On the other hand, the importance of viscous effects for Rossby waves increases as the wavelength becomes shorter, while for Kelvin waves it increases as the wavelength becomes longer.

Abstract

This work studies the effects of viscosity on the gravest Rossby mode on an equatorial beta plane, using linear damping and cooling coefficients. The results show that the vertical wavelength increased for a given forcing phase speed and that the phase speed is reduced for a given vertical wavelength. In addition, the, viscous damping causes a horizontal tilt of the wave axes resulting in a poleward phase propagation. These results are similar to those obtained by Chang (1977) on Kelvin waves. On the other hand, the importance of viscous effects for Rossby waves increases as the wavelength becomes shorter, while for Kelvin waves it increases as the wavelength becomes longer.

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