Distribution of ozone in land surface layer in Fuzhou and its relationship with meteorological factors

Based on the observation data of ozone in near surface layer of Fuzhou urban area from 2009 to 2010,the temporal and spatial distribution characteristics of ozone were studied.The correlation between ozone and related meteorological parameters,and the synoptic weather patterns which were prone to induce ozone concentrations to exceed the national air quality standard,were analyzed.Results indicate that: the ozone concentrations are higher in stations that are close to industrial zones and traffic hubs;two peaks of ozone concentrations in a year appear in May and October respectively,and the valley appears in January.The sequence of seasonal ozone concentration distribution is autumnsummerspringwinter.The ozone pollution days always appear in late spring and summer.Diurnal variations of ozone concentration show the characteristic of a single peak,which begin to rise obviously in the early morning and reach peak values in the afternoon,and maintain low values at night.The ozone concentration has obvious positive correlation with temperature,sunshine hours and solar radiation,and has obvious negative correlation with cloud amount,relative humidity and precipitation.Ozone concentration is high while under the influence of southern wind and eastern wind,and the probability of hourly exceedance of the national air quality standard is the highest in the SSE azimuth.The typical synoptic situations that lead the ozone concentrations to exceed the standard are weathers that are warm and unfavorable for pollutants to disperse,such as the transformed cold high pressure,the ground inverse trough,and the warm sector ahead of fronts.