Abstract
The principal mode of atmospheric circulation on Venus is a zonal retrograde superrotation of the entire atmosphere, from the lowest scale height to altitudes of more than 100 km, with an angular momentum that is about 0.15 percent of the solid planet angular momentum. These values suggest the possibility of significant angular momentum exchanges between the two reservoirs, yielding day length changes that may be of the order of hours and could therefore be detected by earth-based radar. Eddies, the mean meridional circulation, and planetary-scale waves may all be involved in the upward transport of retrograde angular momentum to maintain atmospheric counterrotation. Eddies have been observed in the lower atmoshere and may also transport heat and momentum latitudinally and vertically. Waves are present throughout the atmosphere, over a wide range of spatial scales. The mean zonal and meridional circulations may not be symmetric about the equator.
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