摘要
利用2013~2019年沈阳市11个国控监测站近地层臭氧浓度在线监测数据,分析了沈阳市臭氧长时间序列时空变化规律。结果表明:自2013年以来以O_(3)为首要污染物的天数逐年增加,2017年达到高值;O_(3)-8h呈现先升高后降低,再升高再降低的趋势;O_(3)-8h各个百分位数浓度均呈缓慢增加趋势,年平均增速为2.22μg/m^(3),99%百分位数增速最大,增速为3.30μg/m^(3),50%百分位数增速最小,增速为1.00μg/m^(3);O_(3)-8h和O_(3)-1h月变化呈现明显的单峰型,峰值出现在每年6月或7月,11月~次年2月处于较低水平;O_(3)日变化呈现明显的“单峰型”,白天浓度明显高于夜间,15:00达到峰值,22:00~次日7:00维持在较低浓度;O_(3)-1h的5%、25%、50%、75%、95%和99%百分位数和均值24小时变化曲线表明O_(3)-1h浓度超标时间段主要在12:00~18:00;三环外监测站O_(3)浓度明显高于三环及以内监测站,市中心有明显低值区;高浓度区主要集中于城市东北部和西南部。
Based on the on-line monitoring data of the near surface ozone concentration from 11 national monitoring stations in Shenyang from 2013 to 2019,the temporal and spatial variation characteristics of long time series of ozone is analyzed.The results show that the number of days with O_(3) as the primary pollutant increases year by year since 2013,reaching a high value in 2017.The monitoring data of O_(3)-8h shows a trend of increasing-decreasing-increasing-decreasing.The annual average growth rate is 2.22μg/m^(3),and the 99%percentile is the largest,with the growth rate of 3.30μg/m^(3).The 50%percentile has the smallest growth rate,which is 1.00μg/m^(3).The monthly changes of O_(3)-8h and O_(3)-1h show a trend of obvious unimodal type,the peak appears in June or July every year,while the peak value is low from November to February.The daily change of O_(3) is an obvious"single peak",and the daytime concentration is higher than that at night,reaching the peak at 15:00,and the concentration remains at a lower concentration from 22:00 to 7:00 of the next day.The curve of 5%,25%,50%,75%,95%and 99%percentile and mean 24-hour variation of O_(3)-1h show that the time period of exceeding the standard concentration of O_(3)-1h is mainly 12:00-18:00.The concentration of O_(3) in the monitoring station outside the Third Ring Road is significantly higher than that in the monitoring station within the Third Ring Road.There is an obvious low value area in the downtown of the city.The high concentration areas are mainly concentrated in the northeast and southwest of the city.
作者
任万辉
REN Wanhui(Shenyang Ecological Environment Monitoring Center of Liaoning Province,Shenyang 110167,China)
出处
《环境保护科学》
CAS
2021年第4期106-111,共6页
Environmental Protection Science
基金
中国气象局沈阳大气环境研究所重点项目(2021SYIAEZD2)。
关键词
臭氧
长时间
变化规律
沈阳市
ozone
long-term
variation characteristics
Shenyang
