佛山市PM_(2.5)污染时空分布特征研究

Analysis on Featuresof Spatial and Temporal Distribution of PM_(2.5) During Pollution Period in Foshan

根据2014年佛山市环境空气质量实时发布平台发布的PM_(2.5)监测数据研究了佛山市PM_(2.5)污染时空分布特征。结果表明:2014年佛山市PM_(2.5)日均浓度集中在16~45μg/m^3的浓度区间,PM_(2.5)日均浓度超标的日子主要出现在秋冬季(1月、10~12月)和春季(3月)静稳天气多发的时段,以及夏季(6月)台风外围下沉气流影响时段。污染日平均浓度为101μg/m^3,为年均浓度45μg/m^3的2.2倍。污染时段周末的污染天数略高,受夜间逆温等气象条件影响,污染日内PM_(2.5)各时刻的浓度出现夜间偏高。靠近污染源和污染输送通道的点位年均浓度较高。利用克里金插值进行年均浓度和污染日平均浓度空间分析发现,浓度高值区均位于与广州中心城区相邻,工业制造业较为发达的东北部。污染时段内,中度污染的污染带影响面积覆盖南海区和禅城区的大部分区域。

Based on the PM2.5 monitoring data released by Foshan environmental air quality real--time publishing plat- form in 2014, we analyzed the features of spatial and temporal distribution of PM2.5 in Foshan City. It was found that the daily average concentration of PM2.5 inFoshanconcentratedbetween 16 and 45μg/m^3.The excessive days of PM2.5 occurred mainly in autumn and winter （January, October to December） and spring （March） which static stability weather often appears, and summer ＇（June） affected by Typhoon downdraft. The daily average concentration of PM2.5 was 101 g/m^3 during pollution period, which was 2,2 times of the average annual concentration of 45 g/m^3. The pol- lution days were slightly higher in weekends than working days. For the Inversion layer , the concentration of PM2.5 appeared higher during the night.The annual concentration of monitoring stations near the pollution source and pollu- tion transport channel was higher. The analysis of concentration interpolation during pollution period and normal peri- od by Kriging interpolation showed usthat the high concentration value areas were located in the northeast of Foshan, which located adjacent to the central city of Guangzhou and had moredevelopedindustriat manufacturing. The mesosa- probicpollution zone covered most areas of Nanhai Districtand ChanchengDistrict during pollution period.