Thermal radiation fluxes in the lower atmosphere of Venus

Physics

Scientific paper

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Infrared Radiation, Planetary Radiation, Thermal Radiation, Venus Atmosphere, Albedo, Atmospheric Composition, Carbon Dioxide, Lower Atmosphere, Radiant Flux Density, Venus Clouds, Vertical Distribution, Water Vapor

Scientific paper

The height distribution of effective thermal IR radiation fluxes, as determined from recent data on physical conditions in the subcloud Venusian atmosphere, is investigated for different models of the CO2 and H2O contents and for various degrees of radiation reflection by the clouds. The transmission windows in the CO2 spectrum that are responsible for the transfer of thermal radiation are delineated. It is shown that in an atmosphere of pure CO2, the energy outflux at its maximum near the clouds is twice as great as the maximum possible influx of solar energy to the planet. Calculations are made which indicate that the H2O content in the atmosphere should be about 0.00005 in order for the solar and thermal-radiation fluxes to be consistent. It is found that with an H2O content of about 0.00001, the fluxes may agree if the clouds reflect more than 60% of the thermal radiation incident on them.

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