摘要
利用重庆市九龙坡区大气自动监测资料,对九龙坡城区和城郊2015年3月至2016年2月的NO_2和O_3浓度特征进行了分析,结果表明,城区NO_2和O_3的平均浓度分别为48±15μg/m^3和53±42μg/m^3;城郊分别为32±14μg/m^3和67±45μg/m^3。O_3呈现秋冬季低、春夏季高的季节变化趋势,NO_2则为夏季低、其他季节高的季节变化趋势。NO_2日变化特征呈现早晚双峰型,O_3则为午后单峰型。后向轨迹聚类统计表明九龙坡主要受偏南和偏东气团控制;春冬季对九龙坡NO_2和O_3有清除作用的气团来自东北方向,夏季来自偏南方向,秋季来自西南和东南方向;春冬季对九龙坡NO_2和O_3有累积作用的气团来自西南方向,夏季来自偏北方向,秋季来自偏南方向。
Using the atmosphere automatic monitoring data of Jiulongpo district , Chongqing, the concentration of NO2 and O3 from March 2015 to February 2016 was analyzed. Meanwhile, cluster analysis of backward trajectories was used to explore the effects of long - distance air mass transport to the concentration of NO2 and O3. Results showed that the average concentration of NO2 and O3 in urban areas was 48 ± 15 μg/m^3 and 53 ± 42μg/m^3 respectively, and the corresponding concentration in suburb areas was 32 ± 14 μg/m^3 and 67 ± 45 μg/m^3 respectively. The seasonal variation of O3 expressed low concentration in autumn and winter, and high concentration in spring and summer. NO2 exhibited low concentration in summer, and high concentration in other seasons. With respect to the daily characteristics of pollutants, N02 showed two peaks in the morning and evening; while O3 showed one peak after noon. Statistic results showed that the urban area had significant higher NO2 （ P 〈 0.01） concentrations, and significant lower O3 concentrations than suburb （P〈0. 0 1 ） . Correlation analysis indicated that the O3 concentration was positively correlated with air temperature （P 〈0. 01） , while negatively correlated with the relative humidity （P 〈0. 01）. The cluster analysis of backward trajectories showed easterly winds and southerly winds dominated. The winds that washed the NO2 and O3 concentrations for spring and winter were from northeast , for summer were from south, and for autumn were from southwest and southeast. The winds that accumulated the NO2 and O3 for spring and winter were from southwest, for summer were from the north, and for autumn were from the south.
出处
《环境影响评价》
2017年第3期84-88,93,共6页
Environmental Impact Assessment
基金
重庆市九龙坡区科学技术委员会项目(九龙坡科委[2015]14号)
关键词
九龙坡
二氧化氮
臭氧
后向轨迹聚类
HYSPLIT
Jiulongpo
nitrogen dioxide
ozone
cluster analysis of backward trajectory
Hyslplit
