Effect of recent rate data revisions on stratospheric modeling

Incorporation of recent revisions in rate data for several key reactions (NASA‐JPL, 1982) into our 1‐D model leads to higher OH concentration in the upper stratosphere. Accordingly, the calculated upper stratospheric ClO concentration is higher and appears to be in better agreement with observations. However, the calculated present day upper stratospheric ozone concentration is significantly reduced as a result of higher OH and ClO and the faster rate for O + HO 2 . It is shown that the use of smaller O 2 cross‐section in the Herzberg continuum implies even lower ozone concentration in the upper stratosphere, causing further deterioration of the agreement between model and observations. The effects of the new rate data on the calculated steady state ozone depletion due to release of CFCs are discussed.