石春娥. 2017. 2013~2015年合肥市PM2.5重污染特征研究[J]. 气象学报, ():-, doi:10.11676/qxxb2017.037
2013~2015年合肥市PM2.5重污染特征研究
Characteristics of heavy PM2.5 pollution in Hefei during 2013-2015
投稿时间:2016-11-03  最后修改时间:2016-12-20
DOI:10.11676/qxxb2017.037
中文关键词:  PM2.5重污染,气溶胶,离子组分,消光系数,合肥
英文关键词:heavy PM2.5 pollution, aerosol, ions concentration, extinction coefficient, Hefei
基金项目:安徽省自然科学基金1608085MD84
作者单位E-mail
石春娥 安徽省气象科学研究所 shichune@sina.com 
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中文摘要:
      综合利用中国环境监测网公布的合肥市2013~2015年大气污染物浓度数据和合肥市气象站的常规气象资料,以及激光雷达探测资料、公益性行业(气象)专项(GYHY201206011)获得的气溶胶离子成分分析结果,分析了合肥市PM2.5重污染(日均浓度>150μg/m3)特征。结果表明:(1)2013-2015年,合肥市PM2.5浓度和重污染天数空间分布差异明显,东北部多、西南部少,1月各站差异最大。除了低浓度日(日均浓度≤35μg/m3),PM2.5浓度都存在明显的日变化,午后低、早晚高,且随着污染程度加重,早上峰值出现时间推后。(2)重污染日臭氧以外的气态污染物浓度都显著上升。(3)重污染日常伴随着霾和轻雾天气,以静稳、小风天气为主,重污染日白天相对湿度偏高、风速偏低,600m以下的消光系数显著增大且峰值高度降低。(4)重污染日PM2.5中水溶性无机离子含量增多,其中NO3-含量的占比增加最多,超过了SO42-的占比。研究结论有助于理解硝酸盐对合肥高浓度PM2.5形成的贡献,对PM2.5污染预报和治理有参考意义。
英文摘要:
      The air quality data published by the environmental authorities, meteorological data at Hefei observatory during 2013-2015, together with vertical extinction coefficient data by lidar and water-soluble inorganic ions data of aerosol obtained by scientific field experiment, were used to analyze characteristics of heavy PM2.5 pollution (daily average PM2.5 concentration >150μg/m3) in Hefei. The results show that: (1) PM2.5 pollution show evident spatial difference, with more PM2.5 heavy pollution days at sites in north-eastern part and less at sites in south-western part of Hefei. The monthly variations of heavy PM2.5 pollution days were similar at all sites with biggest difference occurring in January. PM2.5 concentration showed evident diurnal variation with two maxima in the morning and evening, and the morning maximum on heavy polluted days delayed comparing with light polluted days. (2) On heavy PM2.5 polluted days, the concentrations of other gas pollutants, except O3 , increased obviously. (3)The heavy PM2.5 pollution days usually corresponded to haze and light fog, accompanied with high humidity, light wind and stable stratification. The vertical extinction coefficients of aerosol below 600m at noon on heavy polluted days are much higher than those on other air quality grades days with the maximum height decreasing. (4) On heavy polluted days, the water-soluble inorganic ions in PM2.5 became more abundant, and the percentage of NO3- increased most, exceeding the percentage of SO42-. The results may advance our understanding of the role of nitrate in the formation high level PM2.5 and be helpful to the forecast and control of PM2.5 pollution.
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