辽中地区供暖期前后PM_(2.5)质量浓度变化特征分析

Analysis of the Variation Characteristics of PM_(2.5) Mass Concentration around the Heating Period in the Central Liaoning Province

以2014-2016年辽中地区供暖期及水泥错峰生产期为例,分析了PM_(2.5)质量浓度的时空变化特征。重点按有水泥生产无供暖、有水泥生产有供暖、无水泥生产有供暖3个特征时段,进行了同期不同年的纵向对比和同年不同期的横向对比分析,以及PM_(2.5)与NO_2、SO_2的相关性分析;此外,还以沈阳为例,进行了研究期间气流的后向轨迹分析。结果表明:(1)辽中地区供暖期间细颗粒物排放量显著增加,但水泥错峰生产措施可有效降低细颗粒物浓度;(2)研究期内PM_(2.5)质量浓度与NO_2、SO_2呈正相关,NO_2尤为显著,体现了燃油及燃煤对PM_(2.5)的重要贡献;(3)后向轨迹分析揭示受冬季西北风影响,沈阳大气污染物的输送路径主要为途经内蒙东北部、吉林西北部的高风速轨迹,以及途经渤海海域的低风速轨迹。

Taking the heating period and the staggering period of cement production in central Liaoning Province in 2014-2016 as an example, the characteristics of temporal and spatial variation of PM（2.5） mass concentration were analyzed. According to the three feature periods including cement production and no heating, cement production and heating, no cement production and heating, the vertical characteristics of the same period of different years and the horizontal characteristics of the different periods of the same year, and the significant correlation between NO2, SO2 and PM（2.5） concentration were analyzed. In addition, taking the city of Shenyang as an example, the backward trajectory analysis of the airflow during the study period was conducted as well. The results show that in the area of the central Liaoning Province, the particle emissions increased during the heating period, but the cement＇s staggering production measures can effectively reduce the concentration of fine particles.During the study period, the PM（2.5） mass concentration was positively correlated with NO2 and SO2, reflecting the coal and oil make significant contribution to PM（2.5）. The trajectory analysis revealed that affected by northwest wind in winter, the transport path of air pollutants in Shenyang is mainly the high wind speed trajectory through northeast of Inner Mongolia and northwest of Jilin, and the low wind speed trajectory through Bohai sea.