Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977icar...32..168k&link_type=abstract
Icarus, vol. 32, Oct. 1977, p. 168-189.
Astronomy and Astrophysics
Astronomy
15
Astronomical Models, Atmospheric Chemistry, Mars Atmosphere, Photochemical Reactions, Atmospheric Models, Carbon Dioxide, Carbon Monoxide, Density Distribution, Diffusion Coefficient, Oxygen Atoms, Ozone, Water Vapor
Scientific paper
A critical analysis is carried out for models which may be fine tuned to give agreement with observational constraints for O2, CO, and O3 in the Martian lower atmosphere and which are in accord also with upper atmospheric data for O and CO. The models have a number of features in common: dynamic mixing must be exceedingly rapid at heights above 90 km; if heterogeneous processes are not assumed to play a major role in the removal of atmospheric CO and O2, mixing must be rapid at heights between 30 and 40 km. The value implied for the diffusion coefficient in this region depends on the assumptions made regarding the rates for reaction of OH with HO2 to form H2O and the rate of reaction of HO2 with itself to form H2O2. If these reaction rates are taken to have values similar to those used in current models of the earth's stratosphere, the eddy diffusion coefficient at 40 km above the Martian surface should be about 5 by 10 to the seventh power sq cm/sec.
Kong T. Y.
McElroy Michael B.
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