基于多站混合受体模型的临汾市PM2.5潜在源分析

利用重污染城市临汾多个站点2018~2019年的PM_2.5浓度监测数据，分析了不同季节临汾市PM_2.5污染特征及其空间自相关度和集聚模式，最后引入多站受体模型分析临汾市PM_2.5潜在源区.研究发现，临汾市的PM_2.5污染主要集中在临汾盆地内的8个区县，包括尧都、襄汾、洪洞、霍州、侯马、古县、曲沃和翼城，这8个区县的PM_2.5年平均浓度均超过50μg/m³，冬季平均浓度均超过100μg/m³.PM_2.5空间分布特征与地形关系密切，临汾盆地内的8个站点空间自相关度很高，PM_2.5高浓度区（高-高聚类）主要集中在盆地内部，说明邻近区县污染是临汾市主城区PM_2.5浓度居高不下的重要原因.结合多站混合受体模型（MS-PSCF和MS-CWT）分析临汾PM_2.5潜在源区，发现临汾市春季的潜在源主要集中在东北、西南和东南部，大部分为中远距离传播；在夏季，潜在源影响明显低于其他3个季节，主要在东部；秋季的潜在源主要集中在西南方向的一些地区；冬季的潜在源主要集中在东南和西南方向以及临汾市北部近距离区域.除夏季外，其他3季共同的潜在源区是陕西中南部地区（位于西南方向），且PSCF值均超过了0.7，说明在西南风时，临汾市发生污染的概率超过70%.

Analysis of potential sources of PM2.5 in Linfen based on multi-site hybrid receptor model

This paper used the PM_2.5 concentration data of multiple sites in the heavily polluted city Linfen from 2018 to 2019 to study the PM_2.5 concentration characteristics, spatial autocorrelation and agglomeration patterns in different seasons, and finally analyzed the potential source area of PM_2.5 by introducing multi-site receptor model. The study found that the PM_2.5 pollution in Linfen mainly concentrated at 8 sites in the Linfen Basin, including Yaodu, Xiangfen, Hongtong, Huozhou, Houma, Guxian,Quwo and Yicheng. The annual average concentration of PM_2.5 exceeded 50μg/m³, and the average concentration in winter exceeded 100μg/m³. The spatial distribution characteristic of PM_2.5 closely related to the topography, and the eight sites in the Linfen Basin had a high degree of spatial autocorrelation. The high PM_2.5 concentration areas(high-high clustering) were mainly concentrated in the basin. Pollution in neighboring counties was an important reason for the high PM_2.5 concentration in the main urban area of Linfen. Combined with the multi-site mixed receptor model(MS-PSCF and MS-CWT), we analyzed the potential source areas of Linfen and found that the potential sources of Linfen in spring were mainly concentrated in the northeast,southwest and southeast, most of which were medium and long distance transmission; In summer, the potential sources were significantly lower than the other three seasons, mainly in the east; The potential sources in autumn were mainly concentrated in some areas in the southwest; The potential sources in winter were mainly concentrated in the southeast and southwest and the close area in the north of Linfen. Except for summer, the common potential source area for the other three seasons was central and southern Shaanxi(located in the southwest), and the PSCF values all exceed 0.7, indicating that the probability of pollution in Linfen exceeded 70% during the southwest wind.