Temperature effect on the photodissociation rates in the atmospheres of Mars and Venus |
| |
| Authors: | Jean-Paul Parisot Jean-Marc Zucconi |
| |
| Institution: | Observatoire de Besancon, 41 bis, Avenue de l''Observatoire, 25044 Besancon Cédex, France |
| |
| Abstract: | 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 (～250°K), the cross sections are about 15% lower than those at room conditions (Y.L. Yung and W.B. De More, 1982, Icarus, 51, 199). 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! |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
