Ground-level ozone in urban Beijing over a 1-year period: Temporal variations and relationship to atmospheric oxidation
Ground-level ozone in urban Beijing over a 1-year period: Temporal variations and relationship to atmospheric oxidation
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DOI：
10.1016/j.atmosres.2015.05.005
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发表时间：
2015-10
影响因子：
5.5
通讯作者：
Zhanshan Wang;Yunting Li;Tian Chen;Dawei Zhang;Feng Sun;Q. Wei;Xin Dong;Rui-wen Sun;Huan Nin
中科院分区：
文献类型：
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作者：
Zhanshan Wang;Yunting Li;Tian Chen;Dawei Zhang;Feng Sun;Q. Wei;Xin Dong;Rui-wen Sun;Huan Nin
区域臭氧污染已成为中国的一个主要环境问题，特别是在人口稠密和经济活跃的地区，如华北，包括北京。为解决这一问题，对2012年12月至2013年11月北京市区12个站点和北京郊区2个站点的地面臭氧及其前体物（CO、NO和NO2）进行了分析。北京市区O3、CO、NO和NO2的年平均浓度分别为45.5 ± 50.2 μg m− 3、1.5 ± 1.3 mg m− 3、27.3 ± 42.7 μg m− 3和58.3 ± 32.0 μg m− 3。臭氧浓度在夏季最高，而其前体物的浓度在冬季最高。臭氧日变化呈单峰曲线，峰值出现在15：00-16：00。多数臭氧前体物的日变化呈双峰曲线，第一个峰值出现在08：00-09：00左右，第二个峰值出现在夜间。北京市区周末11：00 ~ 24：00臭氧小时浓度高于平日，周末效应明显。这可能是因为在臭氧形成阶段，周末的NO抑制比平日弱。OX（NO2+ O3）日变化呈单峰型，峰值出现在15：00或16：00。OX、O3、NO2之间的相关分析表明，全年白天OX主要受O3控制，夜间主要受NO2控制。冬季由于O3浓度较低，白天和夜间的O2浓度均受NO2的控制。在北京夏季一次典型的臭氧污染过程中，发现了臭氧的区域性沿着上风方向输送。
Regional ozone pollution has become a major environmental concern in China, especially in densely populated and economically vibrant regions such as North China, including Beijing. To address this issue, surface ozone and its precursors (CO, NO, and NO2) from December 2012 to November 2013 at 12 sites in urban Beijing and 2 sites in suburban Beijing were analyzed. The annual average concentrations of O3, CO, NO, and NO2in urban Beijing were 45.5 ± 50.2 μg m− 3, 1.5 ± 1.3 mg m− 3, 27.3 ± 42.7 μg m− 3, and 58.3 + 32.0 μg m− 3, respectively. The concentration of ozone was highest during summer, whereas concentrations of its precursors were highest during winter. Diurnal variations in ozone presented as a single-peak curve, with the peak appearing at about 15:00–16:00. Diurnal variations in most ozone precursors showed bimodal curves; the first peak appeared at about 08:00–09:00, and the second peak appeared at night. Hourly concentrations of ozone on the weekend were higher than those on weekdays between 11:00 and 24:00 in urban Beijing, which was suggestive of a significantweekend effect. This may be because NO inhibition on the weekend is weaker than that on weekdays during the ozone formation phase. Diurnal variations in OX(NO2+ O3) showed a single peak, which appeared at 15:00 or 16:00. The results of correlation analysis among OX, O3, and NO2suggested that OXwas mainly controlled by O3during the day and by NO2during the night throughout the year. OXwas controlled by NO2during both the day and night during winter due to the low concentration of O3. The regional transport of ozone along the upwind direction was found in a typical ozone pollution event in summer in Beijing.