基于日变化特征的珠江三角洲大气污染空间分布研究

Studies on spatial distribution of air pollution in Pearl River Delta based on diurnal variation characteristics

在传统的大气监测网络子站污染物浓度比较的基础上,结合其24h日变化的趋势分析,对珠江三角洲9个城市59个监测点位2013~2015年期间的CO、SO_2、NO_2、O_3、PM_(10)、PM_(2.5)数据进行了分析,以期更深入地揭示珠江三角洲大气污染的空间分布格局和来源特征.结果表明:CO、SO_2、NO_2、PM_(10)、PM_(2.5)主要污染区域集中在珠江三角洲西北部和中部地区,主要以广州和佛山两个城市为污染中心,受到本地源排放贡献较大;O_3污染分布较为复杂,四周污染浓度高,中部浓度低,但广州和东莞两地日变化差异显著,受到本地源影响大.分析显示,珠江三角洲大气污染具有显著的区域性特征,推荐广州天湖和珠海唐家分别作为珠江三角洲北部和东南部的区域污染监测点,能够较好地代表来自珠江三角洲北部的污染传输影响和珠江三角洲东南部的平均污染水平.

In order to reveal spatial distribution and source characteristics deeply,based on traditional comparison with airpollutants concentration of stations in air monitoring net,combined with24hours diurnal variation trend,six conventionalpollutants(CO、SO2、NO2、O3、PM10、PM2.5)at59monitoring sites in Pearl River Delta during2013~2015were analysed.The results showed that CO,SO2,NO2,PM10,PM2.5mainly concentrated in the northwest and middle region of PRD,especially in Guangzhou and Foshan,mainly derived from local source.O3pollution distribution was more complex,which was lower in middle region,but diurnal variation range was big in Guangzhou and Dongguan,which showed thatthe middle region was influenced by local source at some degree.The Pearl River Delta had obvious regionalcharacteristics of air pollution.Tian Hu and Tang Jia were recommended as regional monitoring sites to representinfluence of transmission from north and average pollution level of southeast in PRD.