镇江市臭氧浓度特征分析

Analysis of the characteristics of Ozone concentration in Zhenjiang

根据镇江市4个国控空气自动站2012年7月至2013年6月的空气质量数据,分析镇江市区O3变化特征及规律。结果表明,镇江市区O3污染情况较轻;O3浓度呈现明显的季节特征,日间夏季浓度最高,夜间秋季浓度最低;以春季为研究对象,发现O3浓度呈单峰型分布,与NO x,CO等前体物浓度分布呈负相关关系;O3周末浓度高于工作日,而周末NO2浓度低于工作日,呈现明显的"周末效应";以6月为研究对象,发现长日照时数有利于O3的生成,较高风速有利于O3的扩散;春季在东、西风影响下,镇江市区O3浓度较高。

The characteristics of O3 concentration in Zhenjiang city were analyzed, based on the data collected by the four local state-owned automatic atmospheric observation stations from July 2012 to June 2013. The results showed that O3 pollution in Zhenjiang＇s urban district was not serious. O3 concentrations varied with different sea- sons, and peak maximum and minimum values were observed in the summer dayt and on autumn nights respective- ly. Concentration varied with seasons distinctly, which reached maximal values in the daytime in summer and did minimal values at night in autumn, and there were significant negative relation between O3 and its precursors. O3 concentration on weekends was greater than that on weekdays and NO2 concentration on weekends was lower than that on weekdays, which indicated an obvious O3＂weekend effect＂. With data in June being analyzed, it is found that the temperature effect on the O3 concentration was not obvious, and longer sunshine was better for the formation of O3, while greater wind velocity was better for the diffusion of O3. There were substantial contributions to O3 level with east and west wind in spring.