利用差分吸收光谱系统对O3，SO2和NO2的监测分析

结合我国对空气质量自动监测系统质量保证的要求及差分吸收光谱(DOAS)技术自身的技术特点，重点讨论了对南京江北地区的大气污染物的DOAS监测数据的质量控制， 并对2007年12月—2008年8月ρ(O₃)，ρ(SO₂)和ρ(NO₂)的日、季节变化特征进行了分析. 结果表明:ρ(O₃)，ρ(SO₂)和ρ(NO₂)小时均值的频率分布峰值分别出现在30～40，20～30和30～40 μg/m3；三者超过《环境空气质量标准》(GB3095—1996)一、二级标准的频率分别为4.37%和1.02%(O₃)，21.78%和0.89%(SO₂)，5.65%和0 (NO₂)；ρ(O₃)季节变化十分明显，春季最高；ρ(SO₂)和ρ(NO₂)的日变化与局地排放源、大气扩散能力和人类活动密切相关；ρ(O₃)和ρ(NO₂)日变化呈负相关. 

Observational Analysis of O3, SO2 and NO2 with DOAS System

Based of the requirements of the Chinese national air quality automatic monitoring system and the DOAS technique, quality assurance and data processing were conducted for this study. The characteristics of diurnal and seasonal variations of mass concentration of O₃, SO₂ and NO₂ during December 2007 to August 2008 wereanalyzed. The observational hourly frequency-concentration spectrums showed that the frequency peaks were in the range of 30-40 μg/m3 for O₃, 20-30 μg/m3 forSO₂ and 30-40 μg/m3 for NO₂. The data exceeding the national primary (secondary) air quality standards were 4.37% (1.02%) for O₃, 21.78% (0.89%) for SO₂, and 5.65% (0) for NO₂. The ozone displays distinct seasonal variation, with the maximum in spring. The photochemical ozone diurnal variation had significant negative correlation with NO₂. The diurnal variations of SO₂ and NO₂ are closely related to local anthropogenic emissions, meteorological conditions for air pollutant dispersion and human activities.