Characteristic Research Of Ozone Pollution Of Chengdu Urban At Basin Climate Conditions

Ground-level ozone is an important component of the atmospheric pollution phenomenon, such as photochemical smog. As a strong oxidant, ozone has a certain influence on human health and plant growth. Many regions and organizations in and aboard have the long-term observation for ozone, and carried out to study the effects of climate change on ozone formation.In recent years, due to the impacts of the local climate of the basin—slow wind speed, high frequency of calm wind, short duration of sunshine, temperature inversion phenomenon in winter and urban heat island effect in summer, the unique geographical location, the city’s rapid economic development and human activities, ozone pollution in Chengdu could not be ignored. Based on the hour ozone concentration data from7state-controlled ambient air monitoring sub-station of the Chengdu Environmental Monitoring Center and basin climate data, which is from June2010to May2012, the current status, Diurnal variation and Seasonal changes of ozone pollution in central area of Chengdu were studied in this paper. In addition, through the use of multiple linear regression method, the prediction equation of the ozone concentration was established.Ozone concentrations in the central city of chengdu statistical analysis showed that the variation of ozone concentration, in0-23were unimodal type, the ozone concentration in the morning, when14～16, highest the highest ozone concentrations in the afternoon of the day. With the high NO2pollution time time of chengdu has certain correlation. Monthly average of ozone concentration in the summer half year is markedly higher than that of winter half year, presents the characteristic of summer> spring> autumn> winter. Chengdu city center the highest ozone concentrations in the northwest, slightly low southwest, northeast, southeast, at a minimum, the traditional north for big business to gather, chengdong industrial pollution is small, for commercial residential area south of the city. Ozone concentration effect is not obvious at the weekend, weekday ozone concentration was slightly lower than the weekend, it related to the atmospheric visibility. High temperature, humidity, wind speed, sunshine time long to meteorological conditions, such as high concentration ozone synthesis is bigger. And in the winter because of the large amount of ozone precursor concentration do not increase because of the temperature inversion appears; City summer urban heat island effect, photochemical reaction speed, and the formation of the heat island circulation is advantageous to the pollutants in urban areas accumulation formation of dust cover, make the surface atmospheric ozone concentration is highest in throughout the year. So the highest ozone concentrations in the afternoon of the day, a year, the highest in summer.In view of the chengdu basin climate and ozone concentration changes in relationship to establish multiple linear regression equation, coupled with the weather forecast for the future period ozone concentration to carry on the forecast, the forecasting model adopts ozone day8hour average concentration and meteorological data to establish the forecast model, can reflect the characteristics of the future of ozone changes on a daily basis, predict ozone concentration to lay the theoretical foundation for the business work.