Chemical characterization and sources identification of PM2.5 in a tropical urban city during non-hazy conditions
Chemical characterization and sources identification of PM2.5 in a tropical urban city during non-hazy conditions
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DOI：
10.1016/j.uclim.2021.100953
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发表时间：
2021-09
期刊：
影响因子：
6.4
通讯作者：
Hanashriah Hassan;Mohd Talib Latif;L. Juneng;N. Amil;F. Khan;Y. Fujii;Anas Ahmad Jamhari;H. H. A. Hamid
中科院分区：
文献类型：
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作者：
Hanashriah Hassan;Mohd Talib Latif;L. Juneng;N. Amil;F. Khan;Y. Fujii;Anas Ahmad Jamhari;H. H. A. Hamid
本研究旨在评估PM2.5组分的变化，以及确定PM2.5的来源在非有雾的天气条件下，在热带城市八打灵再也，马来西亚。无烟霞天气的特点是全年雨量充沛，并有短暂的干燥期，没有严重的烟霞事件。采用高容量采样器（HVS）在一栋八层建筑的屋顶上记录PM2.5浓度。采用PMF模型对PM2. 5中水溶性离子（WSI）、微量金属（TM）和有机碳及元素碳（OC-EC）含量进行源解析。PM2.5日浓度范围为9.80-59.9 μgm−3。不同季节的干燥天气条件、降雨量和大气稳定度影响PM2. 5的日变化。PM2.5浓度最高值（33.1 μgm−3）出现在季风间（INT I）季节。PM2.5的主要成分是OC（6.80 μgm−3，24.4%）、EC（0.700 μgm−3，2.5%）和无机物（IM）（6.6 μgm−3，23.7%）。PMF确定了PM2.5的8个主要来源，主要来源是二次无机气溶胶（SIA），交通和石油燃烧（28.5%）。我们注意到，PM2.5的来源特征显着调制的季节性因素在非霾天气条件下。
This study aims to evaluate the variation of PM2.5components as well as to identify PM2.5sources under non-hazy weather conditions in a tropical urban city, Petaling Jaya, Malaysia. The non-hazy weather conditions were characterized by copious rainfall throughout the year and ephemeral dry periods, with no significant haze events. The PM2.5concentrations were recorded on the rooftop of an eight-floor building using a High Volume Sampler (HVS). The water-soluble ion (WSI), trace metal (TM) and organic and elemental carbon (OC-EC) content of PM2.5was determined for source apportionment using the Positive Matrix Factorization (PMF) model. Daily PM2.5concentrations were in the range 9.80–59.9 μgm−3. Dry weather conditions, rainfall and atmospheric stability in different seasons influenced the daily PM2.5variations. The maximum PM2.5concentration (33.1 μgm−3) was measured during the inter monsoon (INT I) season. The major constituents of PM2.5were OC (6.80 μgm−3, 24.4%), EC (0.700 μgm−3, 2.5%) and inorganic matter (IM) (6.6 μgm−3, 23.7%). The PMF identified eight factor profiles of PM2.5sources and the major source contributors were secondary inorganic aerosol (SIA), traffic and oil combustion (28.5%). We note that source characteristics of PM2.5were significantly modulated by seasonal factors during non-hazy weather conditions.