沈阳地区冬季空气颗粒物输送路径及潜在源分析

Analysis of the Transport Path and Potential Source of Air Particles in Shenyang During the Winter

文章利用2016~2017年冬季沈阳地区气象数据和环境空气污染物浓度数据,综合分析沈阳地区冬季环境空气污染特征,分析颗粒物输送路径以及潜在源区贡献情况。结果表明,沈阳地区冬季污染时段内PM2.5是主要污染物,PM2.5平均浓度达到149μg/m^3,最大值达到273μg/m^3。沈阳地区环境空气颗粒物除来源于本地排放外,还主要受到内蒙古东北部和京津冀北部2个方向传输影响,内蒙古东北部方向传输气量约占总气量的70%。潜在源区分析表明,辽宁中西部、内蒙古东北部及京津冀北部是沈阳地区环境空气颗粒物潜在源区。浓度权重轨迹分析表明,辽宁大部、内蒙古东北部、京津冀北部和山东局部地区对沈阳地区的颗粒物浓度贡献较大,PM2.5修正后的浓度权重值WCWT>50μg/m^3,PM10的WCWT值>100μg/m^3。

Based on the Shenyang meteorological data and the air pollutant concentration data in winter from 2016 to 2017,the characteristics of air pollution in winter were comprehensively analyzed,and the particle transport path and the contribution of the potential source areas were also analyzed.The results showed that PM2.5 was the main pollutant during the winter in Shenyang.The average concentration of PM2.5 reached 149μg/m^3,and the maximum value was 273μg/m^3.Beside the local emissions,the environmental air particles in Shenyang area were mainly affected by the transmission in the northeast of Inner Mongolia and the north of Beijing-Tianjin-Hebei.The transmission in the northeast of Inner Mongolia accounted for about 70% of the total gas volume.The analysis of potential source areas showed that the central and western of Liaoning,the Northeast of Inner Mongolia and the north of Beijing-Tianjin-Hebei were the potential source areas.The weight analysis of the concentration trace showed that the majority of Liaoning,the northeast of Inner Mongolia,the north of Beijing-Tianjin-Hebei and the part of Shandong contributed most particle concentration in Shenyang.The WCWT value of PM2.5 was greater than 50μg/m3 after its modification,and the WCWT value of PM10 was greater than 100μg/m^3.