A coupled soil-atmosphere model of H2O2 on Mars

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Mars Atmosphere, Atmospheric Models, Mars Surface, Hydrogen Peroxide, Satellite-Borne Instruments, Gas Chromatography, Viking Spacecraft, Gas Exchange, Atmospheric Composition, Photochemical Reactions

Scientific paper

An analytical model is presented which predicts atmospheric and soil concentrations of H2O2 by calculating a net flux of H2O2 into the soil and adapting an empirically derived adsorption isotherms for water on clean basalt under Martian conditions. Calculations are made for steady-state isothermal conditions at an average Mars surface temperature of 215 K. The concentration of H2O2 is shown to go to zero at a finite depth, a consequence of the nonlinear soil diffusion equation. The model is parametrized in terms of an unknown quantity, the lifetime of H2O2 against heterogeneous catalytic destruction in the soil. The calculated concentrations are compared with an H2O2 concentration of 30 nmoles/cu cm, inferred from the Viking Labeled Release experiment.

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