Temperature effect on the photodissociation rates in the atmospheres of Mars and Venus

Details Temperature effect on the photodissociation rates in the atmospheres of Mars and Venus Temperature effect on the photodissociation rates in the atmospheres of Mars and Venus

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...60..327p&link_type=abstract

Icarus (ISSN 0019-1035), vol. 60, Nov. 1984, p. 327-331.

Physics

11

Mars Atmosphere, Photodissociation, Temperature Effects, Venus Atmosphere, Atmospheric Chemistry, Carbon Dioxide, Water

Scientific paper

The available solar flux at a given altitude in the atmospheres of Mars and Venus is attenuated mainly by CO2 (molecular absorption and Rayleigh scattering) with an extra contribution due to SO2 on Venus. The dissociation cross section of CO2 depends on temperature. At temperatures appropriate for these atmospheres (about 250 K), the cross sections are about 15 percent lower than those at room conditions. It is shown that this temperature effect cannot be neglected in the evaluation of photolysis rates. Calculations of the photodissociation coefficients of CO2, SO2, HCl, and H2O are presented. For example, at the surface of Mars, the coefficient of H2O is nearly multiplied by a factor of 10.

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