Physics
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.1904c&link_type=abstract
American Astronomical Society, DPS meeting #38, #19.04; Bulletin of the American Astronomical Society, Vol. 38, p.515
Physics
Scientific paper
Venus-Express is now in orbit around Venus, and new insights on Venus' atmosphere are expected soon. In this context, we have developed at the Laboratoire de Météorologie Dynamique a new 3-dimensional General Circulation Model of Venus atmosphere, based on our experience of Earth, Mars and Titan models.
The current version of the model is based on a 48x32 grid, on 50 levels from surface to roughly 95 km altitude. No topography has been added yet. The main feature of this new model is the infrared radiative transfer module, which computes the temperature structure self-consistently. This module is based on a temperature-dependent Power Net Exchange matrix, computed with a Monte-Carlo model developed at the Laboratoire d'Energétique de Toulouse. In the radiative transfer calculations, the clouds structure is fixed, though our goal is to couple the model with built-in clouds microphysics, as we have done for Titan. No chemical composition is included yet, but the model can follow passive tracers, as well as tracers relaxing towards a fixed distribution (to mimic idealized chemistry).
We have conducted simulations starting from rest, and a satisfying super-rotation has been obtained, with winds of the order of 150 m s-1 near the clouds top obtained after several tens of Venus days (of the order of 5000 Earth days). Though the temperature structure is not yet fully satisfying, we will discuss the circulation obtained (with emphasis on angular momentum transport by the mean circulation and by eddies), its sensitivity to some model parameters, the vertical stratification of the atmosphere (to be compared with what has been deduced from observations), and also the distributions of given tracers, since the distribution observed for some atmospheric components such as CO is a valuable source of information on the meridional circulation in Venus' atmosphere.
Crespin Audrey
Eymet Vincent
Forget Francois
Fournier Richard
Hourdin Fréderic
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