近地面臭氧污染过程和相关气象因子的分析

Ozone Pollution Process in the Lower Atmosphere and the Meteorological Factors Concerned

为了了解Ｏ＿３的污染过程，进行了包括全天２４ｈＯ＿３浓度和气象参数的观测。分析了高浓度Ｏ＿３日的气象条件，表明高压天气形势、晴天少云、日照持续、气温升高、湿度低、温度垂直梯度和Ｒｉ数较高等是形成高浓度Ｏ＿３的有利条件。从Ｏ＿３浓度全天２４ｈ的观测结果发现，除１２：００～１４：００的主峰外，在０：００～４：００还有一个次峰。所有例子都表明Ｏ＿３浓度日变化和各气象因子有着很好的对应关系，值得注意的是，当风速和太阳辐射同步增减时，共同促使Ｏ＿３浓度增大，使Ｏ＿３在中午出现显著的峰值，当风速值出现在其他时间时，也可以使Ｏ＿３出现次峰。

Based on the previous work, the ozone pollution processes including 24 hour ozone concentrations and meteorological parameters were observed. The results show that the appear-ance of high ozone concentrations resulted from the weather conditions, e. g., high pressure sys-tem, clear day,long sunshine, high temperature, low humidity as well as high values of Ri andΔT/ΔZ. The 24 hour daily variation curves of O_3-NO_x demonstrate that,in addition to the main peak at 12:00-14:00, a second peak appeared at 0:00-4:00. A good corresponding rela-tion also exists between the daily variations of ozone concentrations and the meteorological fac-tors. A notable peak value of ozone concentration occurred at noon when the wind speed and so-lar radiation reached their peak values synchronously. A second peak of ozone could also occur when the peak value of wind speed appeared at another time.