Large-scale motion in the Venus stratosphere

Details Large-scale motion in the Venus stratosphere Large-scale motion in the Venus stratosphere

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jats...36..377r&link_type=abstract

Journal of the Atmospheric Sciences, vol. 36, Mar. 1979, p. 377-389.

Astronomy and Astrophysics

Astronomy

31

Angular Momentum, Atmospheric Circulation, Momentum Transfer, Stratosphere, Venus Atmosphere, Astronomical Models, Atmospheric Models, Mathematical Models, Planetary Rotation, Rossby Regimes, Vorticity, Atmosphere, Venus, Stratosphere, Motion, Rotation, Turbulence, Ultraviolet, Observations, Spectrum, Heat Sources, Transport, Kinetics, Atmospheric Circulation, Flow, Dynamics, Mathematical Models, Rossby Number, Angular Momentum

Scientific paper

To examine a postulate that the horizontal momentum exchanges in the Venusian stratosphere are quasi-nondivergent, the properties of two-dimensional turbulence on a slowly rotating sphere in a high-resolution, one-level numerical model are investigated. It is concluded that the forcing which maintains the stratospheric flow is weak and influences the dynamics far less than the inertial effects. Consequently, the behavior resembles that of vorticity-conserving, two-dimensional flows. On a slowly rotating planet like Venus, such flows are dominated by solid-body rotation and by a planetary wave of unit zonal wavenumber - this wave corresponds to the observed Y-shaped UV feature. Although these largest scales of motion stand out, the dynamic balances of the flow are fundamentally nonlinear, in contrast to the quasi-linear Rossby wave regime on rapidly rotating planets.

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