2014~2019年霸州市高温天气下臭氧(O_(3))变化特征研究

Study on the Characteristics of Ozone (O_(3)) Variation in Bazhou During High Temperature Weather from 2014 to 2019

利用2014~2019年霸州市环境质量监测数据以及同期气象资料,采用数理统计的方法,分析霸州市高温日数与O_(3)浓度的年、季、月、日分布的关系以及高温天气下不同级别的温湿度对O_(3)浓度超标的影响。结果表明:霸州市6年内O_(3)8h (90%)浓度值均超标,O_(3)浓度年值和O_(3)年超标日数在2019年均呈现上升趋势;O_(3)8h (90%)浓度值季节分布与高温日数的变化趋势一致,即夏季>春季>秋季>冬季,且夏春两季O_(3)浓度超标;同高温日数类似,O_(3)8h(90%)月最高浓度值出现在6月,5~9月O_(3)浓度超标,其中6~7月严重超标;高温日,O_(3)浓度日变化呈明显的"单峰型",16时达到峰值,12~18时连续7 h O_(3)浓度值在200μg/m^(3)以上,严重超标;同时得到O_(3)超标时的具体温湿度指标,对提高O_(3)预报预警能力、公众防范O_(3)污染及相关部门科学治理O_(3)污染提供可靠的科学依据。

Based on the environmental observation data and meteorological factors in urban area of Bazhou of Hebei Province from 2014 to 2019,the correlation between the high temperature days and the annual,quarterly,monthly and daily distribution of O_(3) concentration in Bazhou City,as well as the impact of different levels of temperature and humidity on the over standard O_(3) concentration in high temperature weather were analyzed by using the method of mathematical statistics.The results show that:In Bazhou City,the concentration of O_(3) 8 h(90%)exceeded the standard in 6 years,and the annual value of O_(3) concentration and the number of days exceeding the standard in 2019 showed an upward trend.The seasonal distribution of O_(3) 8 h(90%)concentration value was consistent with the change trend of high temperature days,that is,summer>spring>autumn>winter,and the O_(3) concentration exceeded the standard in summer and spring.Similar to the number of high temperature days,the monthly maximum concentration value of O_(3) 8 h(90%)appeared in June,and the O_(3) concentration exceeded the standard from May to September,especially in June and July,the ozone concentration seriously exceeded the standard.In high temperature days,the daily variation of O_(3) concentration showed an obvious"single peak type",reaching the peak at 16∶00 pm,and the concentration of O_(3) was above 200μg/m^(3) for 7 consecutive hours from 12∶00 pm to 18∶00 pm,seriously exceeding the standard.At the same time,the specific temperature and humidity index when O_(3) exceeds the standard was obtained,which can provide reliable scientific basis for improving the ability of O_(3) forecast and early warning,preventing O_(3) pollution by the public and scientific control of O_(3) pollution by relevant departments.