Study On The Variation Characteristics Of Surface Ozone Concentrations And Their Impact Factors

In recent years, the rapid economic development in China has brought drastic atmosphere pollution incidents. Major cities are faced with photochemical threat, and high ozone concentrations are reported frequently. This has been attributed primarily to the increase of anthropogenic ozone precursors. Therefore, it is very important to study surface ozone levels along with their related meteorological factors and ozone production precursors, as well as their interrelationships.In this study, we present measurements of ozone, its precursors (NO, NO2, and CO) and meteorological conditions (solar radiation and temperature) obtained in three observational sites (Jinan, Mt. Tai, and Yantai) from April 2003 to April 2006, and analyzed the temporal characteristics of ozone concentrations and the relationship between ozone tendency and variations of ozone precursor concentrations and meteorological factors. These measurements will not only be help to study the urban air quality but will also be useful in studying the changes in the chemical composition of the regional atmosphere and adopting efficient pollution control measures. The key findings in this study were summarized as follows:(1) Based on the observational data of near surface ozone in the urban area of Jinan during the latest three years, ozone concentrations and their temporal variation characteristics were analyzed. The results showed that ozone concentrations varied fluctuate with a cycle of one year, and the photochemical pollution in Jinan was serious. Diurnal variations of ozone concentrations exhibit a single peak characteristic, with the maximum in the afternoon and minimum in the early morning before sunrise. Ozone concentrations in spring and summer were higher than autumn and winter, while the varying scopes of ozone concentrations in summer and autumn were broader than spring and winter. Variations of ozone concentrations in weekend days and weekdays displayed some distinctions, which was caused by the temporal regulation of human activities.