Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.6005l&link_type=abstract
American Astronomical Society, DPS meeting #41, #60.05
Astronomy and Astrophysics
Astronomy
Scientific paper
The General Circulation Model developed in our laboratory for the study of Venus' atmosphere includes topography, diurnal cycle, dependence of the specific heat to the temperature, and a consistent radiative transfer module based on Net Exchang Rates matrices. The modeled atmosphere develops super-rotation in the cloud region with a peak zonal wind around 60 m/s located near 70 km altitude in the equatorial region. However, below the clouds, winds remain very small compared to observed values. The modeled temperature structure is globally consistent with observations, though the equator-pole temperature contrast in the cloud layer remains too small compared to the observed cold collar. In this context, we conduct an analysis of the mechanisms behind this circulation, with a particular emphasis on the role played by the thermal tides. They transport angular momentum downward at tropical latitudes, opposing the angular momentum transport by the mean meridional circulation, and therefore they help building equatorial angular momentum.
Eymet Vincent
Forget Francois
Fournier Richard
Hourdin Fréderic
Lebonnois Sébastien
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