Planetary-scale waves in the Venus atmosphere

Mathematics

Scientific paper

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Atmospheric Models, Planetary Waves, Venus Atmosphere, Atmospheric Circulation, Linear Equations, Mathematical Models, Traveling Waves, Wave Propagation

Scientific paper

Observed wave-like cloud features on Venus, which at times form a Y-like structure which encircles the planet, were modelled numerically. Linearized primitive equations for a shallow, hydrostatic atmosphere are defined, along with upper boundary layer conditions for the 4-6 day periods detected in the atmospheric response to forcing. The basic state of the Venus atmosphere was considered to display variations in static stability and the mean zonal wind as a function of altitude. Forcing was introduced over a wide range of frequencies in order to produce the target oscillation modes. Combination of a midlatitude Rossby wave and an equatorial Kelvin wave was found to yield the observed Y-shape, which could be preserved with nonlinear coupling.

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