Thermal contrast in the atmosphere of Venus - Initial appraisal from Pioneer Venus probe data

Details Thermal contrast in the atmosphere of Venus - Initial appraisal from Pioneer Venus probe data Thermal contrast in the atmosphere of Venus - Initial appraisal from Pioneer Venus probe data

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979sci...205...46s&link_type=abstract

Science, vol. 205, July 6, 1979, p. 46-49.

Physics

2

Pioneer Venus Spacecraft, Pressure Distribution, Temperature Distribution, Venus Atmosphere, Venus Probes, Altitude, Atmospheric Temperature, Diurnal Variations, Lower Atmosphere, Pressure Gradients, Thermal Radiation, Venus Clouds, Venus, Pioneer Venus, Atmosphere, Temperatures, Clouds, Pressure, Thermal Properties, Radiation, Stratosphere, Troposphere, Probes

Scientific paper

The altitude profiles of temperature and pressure were measured during the descent of four Pioneer Venus probes, showing small contrasts below the clouds, but significant differences within the clouds at altitudes from 45 to 61 km. Measurements of pressure differences were found to be consistent with the cyclostrophic balance of zonal winds ranging from 110 to 150 m/sec at 60 km and from 43 to 77 m/sec at 40 km. The clouds were 10 to 20 K warmer than the extended profiles of the lower atmosphere and the middle cloud is convectively unstable. Both phenomena are due to thermal radiation from below. Meridional wind velocities were studied, concluding that significant planetary scale non-axisymmetric motions were present at latitudes below 30 degrees. This result was consistent with the day-night pressure difference. Indications of flow oscillations in the lower atmosphere were noted and the inference of wave motions in the lower atmosphere was supported by analysis of oscillations in the Doppler residuals.

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