赤壁市臭氧污染特征及气象影响因素分析

Distribution Characteristics of Ozone and Associated Meteorological Factors in Chibi,Hubei

为科技支撑开展臭氧(O_(3))污染精准防治工作,文章利用2017-2019年赤壁市O_(3)浓度和相关气象数据开展赤壁市O_(3)污染特征的研究,并探讨了气象因素对O_(3)浓度的影响,结果表明:赤壁市2017-2019年O_(3)污染年际变化呈现污染程度加重、污染时间提前的特征;O_(3)日变化呈现典型的“昼高夜低”单峰分布特征,O_(3)小时值浓度(ρ(O_(3)))峰值出现时间(16:00-17:00)较晚,推测赤壁市ρ(O_(3))受本地光化学生成和区域传输的共同影响,超标日夜间ρ(O_(3))维持较高浓度与湖陆风有一定关系。气象条件对ρ(O_(3))的影响显著,对比ρ(O_(3))超标日和非超标日气象条件发现:温度和相对湿度对ρ(O_(3))的影响较风速对ρ(O_(3))的影响更为显著,其中87.9%的ρ(O_(3))超标发生在温度25℃及以上,相对湿度为14%~64%时的气象条件下,建议环境管理部门在预判可能出现以上气象条件时,提前部署O_(3)污染防治工作。

In order to provide scientific support for accurate ozone(O_(3))pollution prevention,O_(3)concentration and meteorological data from 2017 to 2019 in Chibi,Hubei are analysed for exploring the O_(3)temporal distribution characteristics and the effects of meteorological factors on O_(3)pollution.The results show that the O_(3)pollution became worse and the pollution date gets emerged from 2017 to 2019.Moreover,the O_(3)concentration diurnal pattern displays a single peak distribution,with O_(3)hourly concentration(ρ(O_(3)))peaking at 16:00-17:00 later than some cities,indicating thatρ(O_(3))may be related to the combined effects of local photochemical production and regional transport of air pollutants.In addition,the appearance of high concentrations ofρ(O_(3))at night on the exceedance day is probably related to the water-land breeze.Meteorological factors can significantly affectρ(O_(3)),the differences in meteorological conditions between O_(3)exceedance and non-exceedance days reveal that the effects of temperature and relative humidity onρ(O_(3))are more important than wind speed.87.9%ofρ(O_(3))exceedances occurs at temperatures at≥25℃,and at relative humidity of 14%~64%.It is recommended that environmental management departments should take emission control measures in advance when the above meteoro?logical conditions are forecasted.