Physics
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976icar...28..231l&link_type=abstract
Icarus, vol. 28, June 1976, p. 231-246.
Physics
15
Hydrogen, Mars Atmosphere, Outgassing, Oxygen, Photochemical Reactions, Atmospheric Chemistry, Carbon Monoxide, Catalysis, Gas Evolution, Recombination Reactions
Scientific paper
It is shown that the Martian photochemistry which recombines CO and O to form CO2 through a water catalytic cycle enables the nonthermal escape of oxygen to govern the thermal escape of hydrogen. The catalytic cycle is described, and the hydrogen and oxygen escape fluxes are calculated. It is found that a change in the O2 mixing ratio will result from a change in the oxygen flux and will induce a significant change in the odd hydrogen concentration, H2 production, and hydrogen escape; this will effectively stabilize the hydrogen escape flux at twice the oxygen flux. Calculations are presented which show that surface chemistry should not change the operation of this mechanism, but will have consequences for the eddy-coefficient variation at low altitudes. A correlation is established among low humidity, large solar zenith angles, and large O3 abundances. Possible effects of atmospheric argon on the present results are investigated.
Donahue Thomas M.
Liu Char-Shine
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