Features of seasonal variations and trends in surface ozone concentration at kislovodsk high-altitude research station

Based on the measurements of surface ozone concentration and weather parameters, the effect of relative humidity, percentile level and NО$_x$ accumulation level along the reverse paths of air mass transport on seasonal variations and trends of ozone was studied at the Kislovodsk high-altitude research station. The configuration of seasonal variation curves and trend values obtained for individual samples made it possible to describe qualitatively the contribution of different processes to variation of surface ozone. Analysis of the results has demonstrated that the contribution of photochemical processes to the surface ozone regime at the station is negligible. The empirical model of surface ozone concentration constructed with the use of weather parameters with due regard for seasonal variations helps in explaining up to 65% of ozone concentration variations.