Abstract
The ozone profile calculated using a one‐dimensional time‐dependent photochemical model, with recommended absorption cross sections and reaction rate constants, is systematically less than Spacelab 3 (May 1985) Atmospheric Trace Molecule Spectroscopy (ATMOS) observations at sunset (χ = 90°), 30°N latitude, throughout the upper stratosphere and mesosphere. Model results are ∼9% smaller than the nominal ATMOS O3 value at 40 km and 50% less at 76 km. Given the uncertainties associated with the ATMOS profile, the model “deficit” may be as large as 15% at 36 km, increasing to ∼70% at 76 km. A similar model O3 deficit exists at sunrise, 47°S latitude, in the stratosphere: nominal differences of ≤25%, increasing to ≤45% when the ATMOS uncertainties are considered. Model results closely approximate ATMOS observations in both the upper stratosphere and mesosphere upon enhancing odd‐oxygen production by increasing the O2 Schumann‐Runge band and Herzberg continuum cross section values used in the calculations.
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