Two Dynamic Regimes of Finite Amplitude Charney and Green Waves .

Details Two Dynamic Regimes of Finite Amplitude Charney and Green Waves . Two Dynamic Regimes of Finite Amplitude Charney and Green Waves .

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jats...43.1288w&link_type=abstract

Journal of Atmospheric Sciences, vol. 43, Issue 12, pp.1288-1296

Computer Science

4

Scientific paper

The weakly nonlinear evolutions of the Green and Charney waves are compared for two regimes: (1) when internal dissipation is the dominant dissipation; (2) when Ekman friction is the dominant dissipation.When the Ekman dissipation is dominant, we obtain a large amplitude equilibrated wave state which depends upon the initial conditions but not upon the magnitudes of the dissipation; the steady wave features a barotropic structure, and does not transport heat in the meridional direction. In sharp contrast, when internal dissipation is dominant, a small amplitude, equilibrated wave state is found, which is independent of the initial conditions but depends on the magnitude of the internal dissipation. The steady wave exhibits a westward phase tilt and transports heat poleward by an amount proportional to the internal dissipation.The presence of a large planetary vorticity gradient stabilizes the finite amplitude evolution of the planetary waves and leads to a stable equilibrium planetary wave state.

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