摘要：A superrotation is simulated in a T10L100 general circulation model for Venus’ middle atmosphere (VMAGCM), in which the radiative effects of aerosols are calculated. The simulation in a domain of 30–100 km is conducted under the condition of a bottom zonal flow with a velocity of 50 m s −1 at the equator. Thermal tides contribute to the maintenance of the cloud-top superrotation together with meridional circulation and vertically propagating gravity waves. The meridional circulation and wave activity are sensitive to the vertical eddy diffusion. Although the equatorial zonal flow has a velocity of about 70 m s −1 when the vertical eddy diffusion coefficient ( K V ) is set at 5.0 m s −2 , it has a velocity of <100 m s −1 when K V = 2.5 m s −2 . The fully developed equatorial jet for the small K V case is enhanced at 65 km by small-scale gravity waves emitted from the cloud top.
