收稿日期: 2015-02-27
修回日期: 2015-03-31
网络出版日期: 2015-11-15
基金资助
北京市科技计划课题(Z131100005613046)、环保公益性行业科研专项(201409005)、国家科技支撑计划课题(2014BAC23B03)和北京市优秀人才培养资助
Analysis on weekend effect of air pollutants in urban atmosphere of Beijing
Received date: 2015-02-27
Revised date: 2015-03-31
Online published: 2015-11-15
对2013年北京市城区12个空气质量自动监测子站的数据进行分析,探讨大气污染物的"周末效应"及O3出现"周末效应"的原因.结果如下:SO2的日变化规律为单峰型曲线,在上午11:00出现峰值;且周末SO2平均小时浓度均高于工作日浓度,一天内的平均偏差为15.57%.NO2的日变化规律为双峰型曲线,峰值出现在08:00和22:00;且在00:00-18:00之间,周末NO2平均小时浓度高于工作日,一天内的平均偏差为7.50%.PM10和PM2.5在工作日的日变化规律均为双峰型曲线;在周末为波浪型曲线,且周末平均小时浓度均高于工作日浓度,一天内的平均偏差分别为17.84%和20.22%.北京市城区O3的日变化规律呈单峰型曲线,在16:00出现峰值.O3的"周末效应"表现为11:00-24:00之间周末O3浓度高于工作日,且各前体物的浓度也高于或接近工作日浓度.可能的原因之一是在O3抑制阶段,周末NO浓度明显低于工作日浓度,导致NO对O3的抑制作用在周末要弱于工作日,有利于O3的生成;原因之二是前体物CO浓度在周末升高,促进了O3的生成,导致O3浓度升高.
王占山 , 李云婷 , 董欣 , 孙瑞雯 , 孙乃迪 , 潘丽波 . 北京城区大气污染物“周末效应”分析[J]. 中国科学院大学学报, 2015 , 32(6) : 843 -850 . DOI: 10.7523/j.issn.2095-6134.2015.06.017
Observed data at 12 air-quality monitoring stations in urban Beijing in 2013 were analyzed for investigating the weekend effect of air pollutants and the reasons of weekend effect of O3. Diurnal variation of SO2 showed a single-peak curve with the peak at 11:00. Average hourly concentrations of SO2 in weekends were higher than those on weekdays, with a daily average deviation of 15.57%. Diurnal variation of NO2 showed a bimodal curve with the peaks at 08:00 and 22:00. Average hourly concentrations of NO2 from 00:00 to 18:00 were higher in weekends than those on weekdays, with a daily average deviation of 7.50%. Diurnal variations of PM10 and PM2.5 showed bimodal curves on weekdays, while showed wave-shape curves in weekends. Average hourly concentrations of PM10 and PM2.5 in weekends were higher than those on weekdays with daily average deviations of 17.84% and 20.22%, respectively. Diurnal variation of O3 in urban Beijing showed a single-peak curve with the peak at 16:00. Concentrations of O3 from 11:00 to 24:00 were higher in weekends than those on weekdays, and concentrations of its precursors in weekends were higher than or close to those on weekdays. One possible reason was that the inhibition of NO on O3 was weaker in weekends than that on weekdays in the O3 suppression stage, which was favorable for the formation of O3. The second reason was that concentration of CO in weekends was higher than that on weekdays, which promoted the formation of O3 and led to weekend effect of O3.
Key words： Beijing; air pollutants; NO2; PM2.5; O3; weekend effect
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