Dynamical implications of the observed thermal contrasts in Venus' upper atmosphere

Details Dynamical implications of the observed thermal contrasts in Venus' upper atmosphere Dynamical implications of the observed thermal contrasts in Venus' upper atmosphere

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...51..574s&link_type=abstract

Icarus, vol. 51, Sept. 1982, p. 574-592.

Physics

11

Atmospheric Circulation, Atmospheric Pressure, Atmospheric Radiation, Venus Atmosphere, Carbon Dioxide, Diurnal Variations, Flow Velocity, Pressure Distribution, Upper Atmosphere, Viscosity, Wind Profiles

Scientific paper

Observational data on the Venusian upper atmosphere are analyzed to determine the dynamical implications of the large pressure change across the terminator, to study the change in diurnal contrast pattern at the 100 km level, and to investigate the viability of the most straightforward explanation of the cooling, radiative emission by CO2 in the 15 micron bands. Evidence is discussed that a major subsidence or downward vertical contraction of the upper atmosphere occurs across the terminator. The observation that supersonic velocities would be induced in horizontal, inviscid flow by the observed pressure distributions affected by the described flow subsidence is investigated by generalizing the equations for adiabatic inviscid flow along streamtubes to the case of nonhorizontal inviscid flow with heat addition. Nightside cooling is discussed, showing variations in cooling rates. Finally, zonal winds below 100 km are considered.

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