佛山惠景城大气污染物浓度时序特征  

Temporal Characteristics of Air Pollutants in Huijingcheng, Foshan

作　　者：何芳芳[1,2] 黄艳玲 徐伟嘉[1,2] 郑丽琴 梁家权 李红霞[1,2] 

机构地区：[1]中山大学先进技术研究院,广东广州510275 [2]东莞中山大学研究院,广东东莞523808 [3]佛山市环境监测中心站,广东佛山528000

出　　处：《环境科学与技术》2015年第5期157-162,共6页Environmental Science & Technology

基　　金：广东省自然科学基金(S2012010008943);佛山市科技发展专项资金项目(2012AA100741)

摘　　要：基于佛山市惠景城区2013年1月1日-12月31日SO2、NO2、O3、PM2.54种大气污染物的时序监测数据,分析其时序特征,4种污染物质量浓度的平均水平和离散程度表现为NO2>PM2.5>O3>SO2。不同时间际的浓度变化以及污染物之间的互相关、自相关分析结果表明:(1)细颗粒污染、臭氧污染分别集中于冬春季和秋季。周一、周二的SO2、NO2、PM2.5浓度高于一周内的其他时日,O3则相反。尤其是周二NO2浓度显著高于其他日该值,可能与周一车流高峰期机动车直接排放NO转化耗时导致NO2峰值延迟有关。在12:00-15:00时段,SO2、NO2、PM2.5浓度最低,O3浓度最高,可能原因为中午高气温可促使地表污染物向高空扩散,而O3作为NO2的光解反应产物,其浓度水平更大程度上受制于太阳辐射强度。(2)4种污染物的自相关系数各不相同,整体上间隔期为1、3(天或时)的历史污染物浓度能够有效影响当前时刻的污染物浓度。SO2、NO2、PM2.5三者之间存在明显的正相关关系,而O3与NO2呈现弱负相关关系,可能与站点地理位置有关,即该站点PM2.5受机动车直接排放影响为主。O3除受NO2的制约外,更大程度上受太阳辐射的影响。According to temporal characteristics analysis of SO2, NO2, 03 and PM2.5 data from 1st Jan. to 31th Dec, 2013 in Huijingcheng, Foshan, average mass concentrations level and discrete degree of the air pollutants follow the rank of NO2〉 PM2.5〉O3〉SO2. And the cross-correlation, auto-correlation, concentration variation analysis under different times indicated that fine particle pollution and ozone pollution concentrate in winter-spring and autumn, respectively. On Monday and Tuesday, the concentrations of SO2, NO2, PM2.5 are higher than the others, O3 is on the contrary. The concentration of NO2 on Tuesday is obviously higher than other days in the week, since it takes time to convert NO to NO2 which lead to peak delay （delay from Monday to Tuesday）. The concentrations of SO2, NO2, PM2.5 during 12：00-15：00 period are the lowest in a day while O3 is the highest. The reason may be that high temperature at noon expedites vertical diffusion. O3, as light decomposition of NO2, its concentration largely depends on light intensity. The autocorrelation coefficients of pollutants are not the same, on the whole, the intimate correlation history time is the past 1, 3 time （day or hour）. Obviously, there is positive correlations among SO2, NO3, PM2.5, and weak negative correlation exists between O3 and NO2, this result may relate to the site position, i.e., the primary source of PM2.5 might be motor vehicle＇s direct emission. In addition to the restriction of NO2, O3 is mainly influenced by solar radiation.

关 键 词：PM2.5 O3 时间序列 自相关 互相关 

分 类 号：X823[环境科学与工程—环境工程]