Carbon dioxide concentrations in the lower thermosphere

Details Carbon dioxide concentrations in the lower thermosphere Carbon dioxide concentrations in the lower thermosphere

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.3883t&link_type=abstract

Journal of Geophysical Research, vol. 83, Aug. 1, 1978, p. 3883-3886. Bundesministerium für Forschung und Technologie

Physics

9

Atmospheric Chemistry, Carbon Dioxide Concentration, Photochemical Reactions, Thermosphere, Carbon Monoxide, Daytime, Mass Spectroscopy, Reaction Kinetics, Turbopause

Scientific paper

Carbon dioxide number densities were measured in the sunlit lower thermosphere on June 29, 1974, above Wallops Island (38 deg N). The CO2 concentrations were obtained with a mass spectrometer that employed a cryo-cooled ion source. Below the turbopause the CO2 densities correspond to the ground-level mixing ratio; above the turbopause the observed n(CO2)/n(Ar) ratio decreases more rapidly with altitude than is expected for diffusive equilibrium. Photolysis and reactions with the O(+) ion alone remove sufficient amounts of CO2 to explain the observed deviation from a pure diffusive-equilibrium separation.

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