Structure and energetics of the atmosphere

Details Structure and energetics of the atmosphere Structure and energetics of the atmosphere

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.296...16t&link_type=abstract

Nature, vol. 296, Mar. 4, 1982, p. 16, 17.

Physics

1

Atmospheric Models, Atmospheric Physics, Greenhouse Effect, Pioneer Venus Spacecraft, Solar Heating, Venus Atmosphere, Atmospheric Tides, Cloud Cover, Polar Regions, Pressure, Surface Temperature, Venera Satellites, Venus, Structure, Energy, Atmosphere, Temperatures, Features, Pressure, Origin, Greenhouse Effect, Pioneer Venus, Venera Missions, Reflectivity, Entrapment, Infrared, Wavelengths, Motion, Heating, Distribution, Absorption, Thermal Properties, Tidal Effects, Polar Regions, Dipole, Circulation, Cl

Scientific paper

The structure of the Venus atmosphere and the mechanisms shaping it are discussed in light of recent Pioneer Venus and Venera data. The greenhouse model accounting for the observed high surface temperatures and pressures has been more fully quantified, with measurements of the amount of solar heating at different altitudes, the vertical distribution of cloud opacity, and the total IR flux escaping from the top of the atmosphere. The radiative and dynamical time constants of the atmosphere at the cloud tops and above have been found to be less than Venusian day, leading to interesting diurnal and seasonal structures including a sharp drop in exospheric temperature at the terminator, and poles warmer than the equator at levels near 90 km altitude. Thermal tides in the atmosphere have also been found to be characterized by a wavenumber of two, and the presence of two prominent atmospheric features, the circumpolar collar of cold temperatures and the polar dipole, two clearings in the polar cloud orbiting the pole, has been detected.

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