Other
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..589s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 12, Sept. 1985, p. 589-591.
Other
16
Annual Variations, Atmospheric Composition, Mesosphere, Sodium, Temperature Dependence, Concentration (Composition), Oxygen, Reaction Kinetics
Scientific paper
For a fixed altitude, the known seasonal variations of pressure in the mesosphere are less than a factor of two. However, the components of the pressure, the total concentration and temperature, vary in opposition to each other. Thus, a rate for a process with an inverse temperature dependence can undergo a much larger seasonal variation than does the pressure. In particular, the loss rate associated with the three-body process Na + O2 + M to NaO2 + M, which has a negative temperature dependence, annually varies by a factor of four at 80 and 85 km for 60 deg N and by less than a factor of two at 30 deg N. Using a recent sodium model, sodium concentrations for 60 deg N at 80 and 85 km are shown to change by factors of three and two, respectively. Other possible contributors to the seasonal variation of mesospheric sodium are argued as less important.
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