Chemical characteristics and source apportionment of PM2.5 in Wuhan, China

IF 3 4区地球科学 Q2 ENVIRONMENTAL SCIENCES

Journal of Atmospheric Chemistry Pub Date : 2019-07-30 DOI:10.1007/s10874-019-09395-0

Fan Huang, Jiabin Zhou, Nan Chen, Yuhua Li, Kuan Li, Shuiping Wu

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引用次数: 28

Abstract

Continuous online measurements of fine particulate matter mass (PM_2.5) and its chemical composition were carried out at an urban monitoring site in Wuhan from March 2017 to February 2018. The PM_2.5 mass concentration ranged from 6.3 to 223?μg/m³, with the highest in winter and the lowest in summer. Water soluble ions (WSIs) were the most abundant component in PM_2.5 (28.8?±?22.9?μg/m³), followed by carbonaceous aerosol (11.9?±?10.4?μg/m³) and elements (5.5?±?6.7?μg/m³). It is noteworthy that six episodes of sustained high PM were observed during the study period. Five major contributors of PM_2.5 were identified by positive matrix factorization (PMF) to be the iron and steel industry, fugitive dust, secondary photochemistry, traffic-related emission and biomass burning, contributing 26.3%, 5.5%, 29.5%, 29.2% and 9.6% to PM_2.5, respectively. Furthermore, conditional probability function (CPF), trajectory analysis and potential source contribution function (PSCF) were used to identify the influences of local activities and regional source. Local sources mainly include Wuhan iron and steel group, construction sites and urban trunk roads, etc. Three pollution transport pathways of PM_2.5 in Wuhan were identified to be northwest, east and south pathway, with the relative contribution of 40%, 17% and 43%, respectively. Western Henan, northern Shaanxi and southwestern Shanxi were identified to be the major potential source regions of PM_2.5 in Wuhan.

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武汉地区PM2.5的化学特征及来源解析

2017年3月至2018年2月，在武汉市某城市监测点对细颗粒物质量(PM2.5)及其化学成分进行了连续在线测量。PM2.5质量浓度在6.3 ~ 223?μg/m3，冬季最高，夏季最低。PM2.5中水溶性离子含量最高(28.8±22.9 μg/m3)，其次是碳质气溶胶(11.9±10.4 μg/m3)和元素(5.5±6.7 μg/m3)。值得注意的是，在研究期间观察到6次持续高PM发作。经正矩阵分解(PMF)分析，PM2.5的5大贡献源分别为钢铁工业、扬尘、二次光化学、交通相关排放和生物质燃烧，对PM2.5的贡献分别为26.3%、5.5%、29.5%、29.2%和9.6%。利用条件概率函数(CPF)、轨迹分析和潜在源贡献函数(PSCF)分析了局部活动和区域源的影响。当地来源主要包括武钢集团、建筑工地、城市主干道等。武汉市PM2.5的3条污染输送路径分别为西北、东、南路径，相对贡献率分别为40%、17%和43%。河南西部、陕西北部和山西西南部是武汉市PM2.5的主要潜在污染源。

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来源期刊

Journal of Atmospheric Chemistry 地学-环境科学

CiteScore

4.60

自引率

5.00%

发文量

审稿时长

7.5 months

期刊介绍： The Journal of Atmospheric Chemistry is devoted to the study of the chemistry of the Earth''s atmosphere, the emphasis being laid on the region below about 100 km. The strongly interdisciplinary nature of atmospheric chemistry means that it embraces a great variety of sciences, but the journal concentrates on the following topics: Observational, interpretative and modelling studies of the composition of air and precipitation and the physiochemical processes in the Earth''s atmosphere, excluding air pollution problems of local importance only. The role of the atmosphere in biogeochemical cycles; the chemical interaction of the oceans, land surface and biosphere with the atmosphere. Laboratory studies of the mechanics in homogeneous and heterogeneous transformation processes in the atmosphere. Descriptions of major advances in instrumentation developed for the measurement of atmospheric composition and chemical properties.