Variations in the surface ozone concentration in the atmosphere over Ulan-Ude

The results of regular measurements of the surface ozone concentration (SOC) in Ulan-Ude over an observation period of six years (1999–2004) are given. The maximum of daily variations in SOC is observed at local noon. The radiation regime is found to have a significant influence only on the minimum values in the SOC seasonal cycle. It is also found that the principal maxima of total ozone content (TOC) and SOC in the seasonal cycle are, on average, shifted by three months (the TOC maximum is reached at the end of March, and the SOC maximum is reached in June).