Dynamical aspects of the venus 4-day circulation

Details Dynamical aspects of the venus 4-day circulation Dynamical aspects of the venus 4-day circulation

Sep 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973p%26ss...21.1563y&link_type=abstract

Planetary and Space Science, Volume 21, Issue 9, p. 1563-1580.

Statistics

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8

Scientific paper

Evidence for the 4-day retrograde zonal circulation of the upper Venus atmosphere is summarized. The `moving flame' phenomenon, convective instability to a mean shear and tidal forcing are discussed as possible dynamical explanations for the 4-day rotation. Tidal forcing seems feasible only if momentum diffusion is molecular in nature. Convective instability to a mean shear, although it can account for the magnitude of the 4-day circulation, must be supplemented by another mechanism, the `moving flame' say, to explain the direction of the zonal motion. However, numerical computations indicate that the `moving flame' by itself can account for both the magnitude and direction of the 4-day rotation. It appears that the stable stratification above altitudes of about 60 km is an essential factor in the `moving flame' mechanism for generating the retrograde atmospheric rotation.

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