Thermal fluxes and cooling rates in the Venus atmosphere from Venera-15 infrared spectrometer data

Details Thermal fluxes and cooling rates in the Venus atmosphere from Venera-15 infrared spectrometer data Thermal fluxes and cooling rates in the Venus atmosphere from Venera-15 infrared spectrometer data

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adspr..12...73t&link_type=abstract

(Recent results on Mars and Venus; Proceedings of Symposium 3 and the Topical Meetings of the Interdisciplinary Scientific Commi

Computer Science

2

Aerosols, Heat Flux, Infrared Spectrometers, Radiant Cooling, Thermal Radiation, Venus Atmosphere, Remote Sensing, Venera Satellites, Venus Clouds

Scientific paper

The results of infrared spectrometer experiment on board Venera-15 spacecraft provided the chance to retrieve the thermal and aerosol structures of the atmosphere in a self-consistent way for the altitudes 55-100 km. On the basis of these data, the outgoing thermal flux and cooling rates were computed. The value of the outgoing flux is 170-180 W/sq m for the latitudes 0-50 deg N. In the 'cold collar' region (50-70 deg N), an abrupt decrease of the flux to the values of 130-140 W/sq m is observed. The outgoing flux reaches its maximal value of about 210 W/sq m in the region of polar 'hot spots'. The cooling rate above 80 km is mainly affected by the radiative transport in the 15-micron CO2 band. Its value increases with altitude and reaches the value of 30-40 K/day at 100 km. In the altitude range 75-55 km, the cooling rate profile depends on the cloud structure. At the altitudes of 60-65 km, the cooling rate maximum of 5-10 K/day connected with the cloud top is observed.

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