Possible dynamical influences on the diurnal behavior of ozone are investigated. A time dependent one-dimensional photochemical model is developed for this purpose. All model calculations are made at 70¿N during summer, because of available data on turbulence and zonal winds at Poker Flat, Alaska, and ozone observations from the Solar Mesosphere Explorer (SME) satellite. The model includes vertical diffusion induced by breaking gravity waves, as parameterized by Lindzen (1981). We show that the vertical diffusion can vary as much as 1 order of magnitude within a day as a result of large changes in the zonal wind induced by atmospheric thermal tides. It is found that by introducing a dissipation time scale for turbulence produced by breaking gravity waves, the agreement with Poker Flat echo data is improved. Comparisons of results from photochemical model calculations where the vertical diffusion is a function of height only with those in which Kzz is changing in time show large differences in the diurnal behavior of ozone between 70 and 90 km. By including the dynamical effect, much better agreement with the SME data is obtained. The results are, however, sensitive to the background zonally averaged wind. The influence of including time-varying Kzz on the OH densities is also large, especially between 80 and 90 km. This suggests that dynamical effects are important in determining the diurnal behavior of the airglow emission from the Meinel bands. ¿American Geophysical Union 1987