Venus' superrotation, mixing length theory and eddy diffusion - A parametric study

Details Venus' superrotation, mixing length theory and eddy diffusion - A parametric study Venus' superrotation, mixing length theory and eddy diffusion - A parametric study

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988em%26p...41...45m&link_type=abstract

Earth, Moon, and Planets (ISSN 0167-9295), vol. 41, April 1988, p. 45-76.

Physics

Fluid Dynamics

4

Mixing Length Flow Theory, Planetary Rotation, Superrotation, Venus Atmosphere, Angular Velocity, Diffusion Theory, Meridional Flow, Vortices, Zonal Flow (Meteorology)

Scientific paper

The concept of the Hadley mechanism is adopted to describe the axisymmetric circulation of the Venus atmosphere. It is shown that, for the atmosphere of a slowly rotating planet such as Venus, a form of the nonliner 'closure' (self-consistent solution) of the fluid dynamics system which constrains the magnitude of the eddy diffusion coefficients can be postulated. A nonlinear one-layer spectral model of the zonally symmetric circulation was then used to establish the relationship between the heat source, the meridional circulation, and the eddy diffusion coefficients, yielding large zonal velocities. Computer experiments indicated that proportional changes in the heat source and eddy diffusion coefficients do not significantly change the zonal velocities. It was also found that, for large eddy diffusion coefficients, the meridional velocity is virtually constant; below a threshold in the diffusion rate, the meridional velocity decreases; and, for large eddy diffusion and small heating rates, the zonal velocities decrease with decreasing planetary rotation rates.

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