Computer Science
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..411g&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, April 1984, p. 411-423.
Computer Science
112
Atmospheric Models, Auroral Ionization, Middle Atmosphere, Nitrogen Oxides, Solar Cycles, Solar Terrestrial Interactions, Cosmic Rays, Mesosphere, Ozone, Solar Flux, Thermosphere
Scientific paper
A 2D numerical model with coupled photochemistry and dynamics has been used to investigate the response of the middle atmosphere (16-116 km) to changes in solar activity over the 11-year solar cycle. Model inputs that vary with solar cycle include solar radiation, cosmic-ray and auroral ionization rates, and the flux of NO(x) at the model's upper boundary. The results of model runs for solar minimum and maximum conditions are compared. In the stratosphere, using current estimates of changes in solar radiation at wavelengths longer than 180 nm, only small responses in ozone, temperature, and zonal winds are obtained. Changes at shorter wavelengths and the effects of particle precipitation lead to large variations in the abundances of trace species in the thermosphere and upper mesosphere. Very large abundances of NO(x) are produced above 90 km by auroral particle precipitation and transported to the stratosphere by the global mean meridional circulation. It is shown that this excess NO(x) can lead to significant decreases in ozone concentrations at high latitudes, and that it may explain observations of nitrate deposition in Antarctic snow.
Garcia Rafael
Roble Ray
Rusch David W.
Solomon Sean
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