Photochemical processes induced by a major warming of the upper atmosphere - Variations in mesospheric trace constituents

Details Photochemical processes induced by a major warming of the upper atmosphere - Variations in mesospheric trace constituents Photochemical processes induced by a major warming of the upper atmosphere - Variations in mesospheric trace constituents

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.3148f&link_type=abstract

Journal of Geophysical Research, vol. 86, Apr. 20, 1981, p. 3148-3152.

Physics

3

Atmospheric Chemistry, Atmospheric Composition, Atmospheric Heating, Mesosphere, Ozonometry, Photochemical Reactions, Atmospheric Models, Atmospheric Pressure, Atmospheric Temperature, Mixing, Planetary Waves, Temperature Effects, Thermal Expansion, Trace Contaminants, Wind Effects

Scientific paper

The temperature rise and enhanced winds during an upper atmospheric warming cause substantial changes in the high level ozone profile of the sunlit winter hemisphere. Calculations based on a photochemical model, using temperatures measured at Fort Churchill during a major warming, predict a factor of 2 variation in the ozone number density near 60 km over a time period of approximately 3 weeks. This temporal variability at a fixed location results from the planetary wave structure of the temperature field and reflects a similar longitudinal behavior at a given time. The ozone number density at fixed altitude is a maximum when the temperature is greatest at and below this level. This is due primarily to thermal expansion of the atmosphere which results in a large increase in pressure at constant altitude. However, chemical activity during a warming decreases the mesospheric ozone mixing ratio at fixed pressure. The ozone mixing ratio at constant pressure during the peak of the event studied is near 75% of its unperturbed value. The predicted variability of ozone in longitude and time demonstrates the need for hemispheric scale information on trace gas abundances, temperature, and winds in order to delineate adequately the response of upper atmospheric composition to a major perturbation.

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