Search Publications

Long-term variation in the cloud-tracked zonal velocities at the cloud top of Venus deduced from Venus Express VMC images

Futaana, Yoshifumi; Imamura, Takeshi; Kouyama, Toru +2 more

We present observational evidence of the variation of the cloud-tracked zonal velocity by ~20 m s^-1 with a timescale of a few hundred days in the southern low latitude region based on an analysis of cloud images taken by the Venus Monitoring Camera on board Venus Express. A spectral analysis suggests that the variation has a periodicity…

Incorporation of a gravity wave momentum deposition parameterization into the Venus Thermosphere General Circulation Model (VTGCM)

Brecht, A. S.; Bougher, S. W.; Rafkin, S. +2 more

The gravity wave-drag parameterization of Alexander and Dunkerton (1999) was implemented into a Venus Thermosphere General Circulation Model (VTGCM) to investigate breaking gravity waves as a source of momentum deposition in Venus' thermosphere. Previously, deceleration of zonal jets on the morning and evening terminators in models was accomplishe…

Simulations of the latitudinal variability of CO-like and OCS-like passive tracers below the clouds of Venus using the Laboratoire de Météorologie Dynamique GCM

Lebonnois, S.; Marcq, E.

The lower atmosphere of Venus below the clouds is a transitional region between the relatively calm lowermost scale height and the superrotating atmosphere in the cloud region and above. Any observational constraint is then welcome to help in the development of general circulation models of Venus, a difficult task considering the thickness of its …