Physics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..479f&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 44, June 1982, p. 479-488.
Physics
22
Annual Variations, Atmospheric Chemistry, Atmospheric Models, Distribution (Property), Mesosphere, Nitrogen Oxides, Atmospheric Composition, Gas Transport, Photochemical Reactions, Photodissociation, Recombination Reactions, Stratosphere, Thermosphere
Scientific paper
Model calculations of the distribution of mesospheric odd nitrogen (NOx) predict large differences between the summer and winter hemispheres. The smallest mixing ratios occur in summer where dissociation of NO followed by recombination provides an efficient sink and creates a sharp minimum between 70 and 75 km. No such minimum occurs in the winter where a downward flux of NOx extends from the lower thermosphere into the upper stratosphere. However, dissociation still exerts a major influence on the NOx abundance in the winter hemisphere and limits the downward flow of nitric oxide to values much smaller than expected in the polar night.
Frederick John E.
Orsini N.
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