摘要
结合许昌市2019-2022年夏季(5-9月)臭氧(O3)逐小时质量浓度与气象数据,分析O3浓度变化特征与气象因子的影响,识别O3污染传输特征与潜在源分布.结果表明,许昌市2019-2022年夏季O3浓度整体呈下降趋势,但2022年O3季均值略有上升;夏季中6月的O3污染最重,平均日超标率达61％;O3浓度日变化呈单峰状,峰值出现在16:00左右;O3浓度与气温、风速呈正相关,与相对湿度呈负相关;当气温≥35 ℃、相对湿度为20％～＜40％、风速为2～＜3 m/s、主要风向为南风、东南风时易发生O3小时浓度超标;6月高温(气温≥30 ℃)和低湿(相对湿度20％～＜40％)时段持续时间长是导致O3浓度较高的重要因素;2022年夏季气团主要来自东北、西南和东南方向;除本地生成外,许昌市高浓度O3还受到山东、安徽、湖北等区域传输影响.
Abstract
Based on the hourly O3 concentration and meteorological data during the summer(May to September)from 2019 to 2022,the features of O3 concentration and influence of methodological factors were analyzed.Additionally,the transportation and potential sources of O3 pollution in Xuchang City were also clarified.The results showed that the O3 concentrations in summer were generally decilining,but slightly increased in 2022.O3 pollution was heaviest in June with a average daily exceedance rate of 61％.The diurnal variation of O3 concentration showed a single peak,which happened at approximately 16:00.O3 concentration had a negative correlation with relative humidity but a positive correlation with temperature and wind speed.The hourly concentration of O3 was easily exceed the standard when the temperature≥ 35 ℃,relative humidity ranged 20％-＜40％,wind speed between 2-＜3 m/s and the wind direction was south and southeast.In the June,high temperature(≥30 ℃)and low humidity(20％-＜40％)were important factors leading to high O3 concentration.In the summer of 2022,the air mass mainly comes from the northeast,southwest and southeast.In addition to the local formation,the high concentration of O3 in Xuchang City was also influenced by the transmission of other cities,including Henan,Shandong,Anhui,Hubei and other regions.
基金项目
大气重污染成因与治理攻关项目(DQGG202136)
郑州轻工业大学博士科研基金(2022BSJJZK11)
维普
万方数据