Maximum CO2 Amount on Venus: Present and Past

Details Maximum CO2 Amount on Venus: Present and Past Maximum CO2 Amount on Venus: Present and Past

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..499h&link_type=abstract

Lunar and Planetary Science, volume 27, page 499

Computer Science

Atmospheres: Evolution, Carbonates, Venus

Scientific paper

Carbonate as storage of CO2: Venusian atmospheric CO2 amount is suggested to be controlled or buffered by carbonate on the surface (Carbonate Buffer). That is, atmospheric CO2 increase would be suppressed by carbonate formation and CO2 decrease would be thwarted by carbonate decomposition. Carbonate-silicate equilibria, such as CaCO3 + SiO2 = CaSiO3 + CO2 are suggested by some authors. In fact, observed Venusian CO2 atmosphere that mean temperature is 740K and pressure is 92 bar at the bottom, agree well with the equilibrium CO2 pressure for reaction, which is P CO2 = 89 bar at 740 K. However, Hashimoto et al. showed that the state buffered by large amount of carbonate is unstable for small perturbations. We constrained the maximum CO2 amount on present Venus by this stability condition, and that on past Venus by the stability of carbonate on the surface.

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