Nonlinear forcing of planetary scale waves by amplifying unstable baroclinic eddies generated in the troposphere

Computer Science

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Baroclinic Waves, Planetary Waves, Tropospheric Waves, Wave Interaction, Energy Dissipation, Heat Flux, Kinetic Energy, Momentum Transfer, Southern Hemisphere, Wave Amplification

Scientific paper

The present investigation is mainly concerned with isolating the effects of wave-wave coupling on the growth of planetary-scale baroclinic modes of zonal wavenumber 1-3. It is shown that a global distribution of amplifying intermediate-scale baroclinic modes can cause rapid growth of planetary-scale modes. The growth rates of the planetary modes are found to be comparable to the growth rates of the most unstable baroclinic modes during the first 5-10 days. Thereafter the planetary waves continue to grow (albeit at a slower rate and not necessarily monotonically), and do not exhibit a decay phase as pronounced as that which is characteristic of the intermediate-scale modes.

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