沈阳一次空气重污染过程颗粒物输送路径及潜在源区分析

Analysis of particle transport path and potential source area in the process of primary air heavy pollution in Shenyang

利用2021年1月20—28日沈阳地区环境空气污染物浓度和气象数据,综合分析本次重污染过程中环境空气的污染变化特征,利用后向轨迹分析法以及潜在源贡献因子分析法(PSCF)和浓度权重轨迹分析法(CWT),分析颗粒物的传输路径以及潜在源贡献情况。研究结果表明:本次污染过程的主要污染物为颗粒物,PM_(2.5)和PM_(10)的最大日均浓度分别达到了142.9和181.3μg/m^(3)。沈阳地区的污染受到本地和区域传输共同影响。污染物传输路径分别来自内蒙古东北部、俄罗斯和辽宁南部3个方向,分别占空气团总量的19.4%、30.6%和50.0%。PSCF和CWT分析表明,此次污染过程中PM_(2.5)和PM_(10)的主要外来潜在源区为辽宁中南部地区的辽河下游平原地区。

Based on the ambient air pollutant concentration and meteorological data in Shenyang from January 20 to 28,2021,the pollution change characteristics of the ambient air during the heavy pollution process are comprehensively analyzed, and the transmission path and potential source contribution of particulate matter are analyzed by using the backward trajectory analysis method, the potential source contribution factor analysis method(PSCF) and the concentration weighted trajectory analysis method(CWT).The results show that the main pollutant in this pollution process is particulate matter, and the daily average concentrations of PM_(2.5) and PM_(10) reach 142.9 and 181.3 μg/m^(3) respectively.The pollution in Shenyang area is affected by local and regional transmission.The pollutant transmission paths come from Northeast Inner Mongolia, Russia and southern Liaoning, accounting for 19.4%,30.6% and 50.0% of the total air mass respectively.PSCF and CWT analysis show that the main potential source area of PM;and PM;in this pollution process is the lower reaches of Liaohe River Plain in central and southern Liaoning.