摘要
利用2017—2020年承德市环境监测站和承德市国家基准气象站的数据,分析了承德市近地层O_(3)浓度特征,O_(3)与其他污染物之间的关系和气象因子对O_(3)浓度的影响。结果表明,2017—2020年承德市年平均O_(3)超标日数40天,占总超标日数的55%。承德市O_(3)-8h浓度呈现夏季>春季>秋季>冬季的季节变化特征,5—7月份O_(3)-8h浓度最高,平均浓度超过160μg·m^(-3)。O_(3)浓度的日变化表现为单峰型分布,O_(3)浓度最低值出现在清晨7:00—8:00时,峰值出现在14:00—16:00时。O_(3)-8h浓度与细颗粒物PM_(10)和PM_(2.5)在夏季呈显著的正相关关系,其他季节相关性不显著;O_(3)-8h浓度与前体物CO和NO_(2)在夏季呈显著的正相关关系,冬季呈显著的负相关关系。太阳总辐射强度大于750 W·m^(-2),最高气温大于30℃,无降水和相对湿度30%~60%,受地面偏南气流影响的气象条件下,承德市易于出现O_(3)-8h浓度超标天气。
Based on the data of 2017—2020 from Chengde Environmental Monitoring Station and Chengde National Weather Station,characteristics of O_(3)concentration in the near-surface layer of Chengde,relationship between O_(3)and other pollutants and influence of meteorological factors on O_(3)concentration were analyzed.The results showed that in 2017—2020,the annual average number of ozone exceeding standard days is 37 days,accounting for 51.4%of the total standard-exceeding days.The concentration of O_(3)-8h in Chengde showed the seasonal variation characteristics of summer>spring>autumn>winter.The highest concentration of O_(3)-8h is from May to July when their average concentration exceeded 160μg·m^(-3).The daily variation of O_(3)concentration was characterized by a unimodal distribution.The lowest O_(3)concentration occurs at 7:00-8:00 in the morning and the peak appears at 14:00-16:00 in the afternoon.There was a significant positive correlation between O_(3)-8h concentration and PM_(10) and PM_(2.5) concentrations in summer,but in other seasons the correlations were not significant.There was a significant positive correlation between O_(3)-8h concentration and CO and NO_(2) concentrations in summer,but a significant negative correlation in winter.Under the meteorological conditions where the total solar radiation intensity was higher than 750 W·m^(-2),the maximum temperature was over 30℃,there was no precipitation and relative humidity was in 30%-60%,and the surface is affected by southerly air flow,O_(3)-8h concentration in Chengde City is easier to exceed the standard.
作者
李杰
杨庆红
Li Jie;Yang Qinghong(Chengde Meteorological Bureau,Chengde 067000)
出处
《环保科技》
2021年第6期6-11,共6页
Environmental Protection and Technology
基金
国家科技支撑计划项目(2014BAC23B01)
河北省创新能力提升计划项目(18964201H)。
关键词
承德市
O_(3)污染
前体物
气象因子
Chengde City
ozone pollution
precursor
meteorological factor
