Modeling of Chemical Processes in the Troposphere and Stratosphere.

The Diurnal Variation of the Neutral Sodium Species in the Upper Atmosphere. A Model Study.

“…The one-dimensional model of mesospheric trace gases covers the altitude range from 60-100 km. It is an extension of the model previously used in studies of stratospheric chemistry (Sze, Ko, Specht, and Livshits, 1980).…”

“…Concentrations of short-lived photochemical species are calculated using the grouping technique previously employed in stratospheric models (Sze et al, 1980). where nit Pi' and Li denote the density, production, and loss frequency for the ith species.…”

“…The sodium is transported by diffusion into the troposphere where it is removed by heterogeneous processes with an effective lifetime of 10 days. The values of the diffusion coefficients below 70 km are the same as those used in the stratospheric model (Sze, Ko, Specht, and Livshits, 1980). Above 70 km, a value of 106 cm 2 s -I is adopted as suggested by Hunten (1975).…”