兰州市O3污染特征及气象因子相关性研究

The relevance between the characteristics of O3 and meteorological factors in LanZhou

为研究兰州市臭氧污染特征及与气象因子相关性,对2016-2018年兰州市5个国控环境空气监测站点O3连续小时监测数据进行分析研究。结果表明:近3年兰州市臭氧污染日趋严重,其作为首要污染物从2016年75d发展为2018年112d,O3-8h 90百分位年均浓度值从2016年125.71μg/m^3增长为146.58μg/m^3。夏季污染天数最多,表现为夏季>春季>秋季>冬季的特征,臭氧浓度日变化特征呈明显单峰型分布,15:00左右出现峰值,同时存在周末效应。O3与气象因子相关性研究表明:与温度呈现正相关,相关系数为0.52,与相对湿度、气压呈显著负相关,与风速相关性较低,与风向存在正相关,但相关性不明显。

In order to study the relevance between pollution characteristics of O3 and meteorological factor in LanZhou,The O3 hourly monitoring data of the national atmospheric environment monitoring network system from 2016 to 2018 were analyzed.The results show that in recent three years,O3 pollution in lanzhou is becoming increasingly serious.As the primary pollutant,it has developed from 75d in 2016 to 112d in 2018,and the 90%annual average annual concentration of O3-8h has increased from 125.71μg/m^3 in 2016 to 146.58μg/m^3 in 2018.The number in summer is the most,which is characterized by summer>spring>autumn>winter.The diurnal variation of O3 concentration shows an obvious single-peak distribution,with a peak around 15:00,and weekend effect.Research on the relevance between O3 and meteorological factors shows that O3 is positively correlated with temperature,with the relevance of 0.52,significantly negatively correlated with relative humidity and air pressure,slightly correlated with wind speed,and positively correlated with wind direction,but not significantly correlated.