2009年天津城区地面O3和NOx的季节变化与相关性分析
SEASONAL VARIATION AND ANALYSIS OF THE RELATIONSHIP BETWEEN NO,NO2 AND O3 CONCENTRATIONS IN TIANJIN IN 2009
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摘要: 作为城市污染大气的首要光化学污染物,臭氧的变化特征与NO、NO2密切相关.分析天津城区2009年全年O3、NO和NO2体积浓度变化特征,结果表明,O3体积浓度春夏季高,这种分布特征与短波辐射的季节分布有关,日照时数和云量的分布证实了这一点.NO浓度冬季最高,夏季最低,NO2浓度秋季最高,夏季最低;相关性分析表明有NOx参与的光化学反应是O3生成的主要方式.OX(OX=NO2+O3)浓度与NOx浓度的相关性分析表明,春季O3背景值最高,区域污染最重,夏季大气光化学反应最为强烈,大气氧化能力最强,局地NOx对O3生成的贡献最大.Abstract: As the primary gaseous contaminant in urban ambient, ozone variation correlates well with nitrogen oxides (NOx=NO+NO2). Based on the observed data of near surface O3, NO and NO2 in the urban area of Tianjin during 2009, O3 temporal variation and the relationship between NO, NO2 and O3 concentrations were studied. The results showed that high O3 concentrations in Tianjin appeared in the spring and summer, when monthly mean O3 concentration was more than 40 μL·m-3 in April. This was due to the seasonal variation of solar radiation, caused by the distribution of sunshine duration and cloud amount. The highest concentrations of NO, NO2 appeared in winter and autumn respectively, while the lowest concentrations appeared in summer. The correlation between O3 and its precursors (NO, NO2) indicated that photochemical reaction with NO, NO2 was the primary process of ozone generation.It was also shown that the level of OX(OX=O3+NO2) was made up of two contributions. Regional contribution was affected by regional background O3 level,with the maximum in spring, while local contribution was effectively correlated with the level of ozone precursors (NO, NO2) with the maximum in summer.
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Key words:
- ozone /
- nitrogen oxides /
- seasonal variation /
- relationship /
- Tianjin
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