Chemical characteristics of PM1/PM2.5 and influence on visual range at the summit of Mount Tai, North China
Chemical characteristics of PM1/PM2.5 and influence on visual range at the summit of Mount Tai, North China
复制标题
华北泰山山顶PM1/PM2.5化学特征及其对视距的影响
DOI：
10.1016/j.scitotenv.2016.09.173
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发表时间：
2017-01-01
影响因子：
9.8
通讯作者：
Wang, Wenxing
中科院分区：
文献类型：
--
作者：
Zhao, Tong;Yang, Lingxiao;Wang, Wenxing
2014年夏秋两季，在泰山山顶同时采集了白天和夜间的PM1和PM2.5样本，分析其质量浓度和化学成分，以确定PM1和PM2.5的时间变化及其对能见度损害的影响。夏季，PM1和PM2.5平均质量浓度分别为38.16μg/m(3)和53.33μg/m(3)。秋季分别为42.75μg/m(3)和59.16μg/m(3)。水溶性无机离子是 PM1 和 PM2.5 中最丰富的物种，其次是有机物质 (OM)。主要水溶性离子中SO(4)(2-)和NH4+的浓度夏季高于秋季，而NO3-的浓度则呈现相反的季节趋势。夏季有机碳（OC）、元素碳（EC）和水溶性有机碳（WSOC）浓度低于秋季。由于泰山特定的气象条件，水溶性成分（SOO42-、NO3-、NH4+和WSOC）表现出明显的日变化。 PM1和PM2.5中的水分含量因水溶性成分，特别是NH4NO3而增加。能见度下降是颗粒物和相对湿度（RH）共同影响的结果。能见度对应的PM2.5浓度阈值
Daytime and night-time PM1 and PM2.5 samples were simultaneously collected at the summit of Mount Tai during summer and autumn 2014. The mass concentrations and chemical compositions were analysed to determine the temporal variations of PM1 and PM2.5 and their contributions to visibility impairment. In summer, the average mass concentrations of PM1 and PM2.5 were 38.16 mu g/m(3) and 53.33 mu g/m(3), respectively. In autumn, the values were 42.75 mu g/m(3) and 59.16 mu g/m(3). Water-soluble inorganic ions were the most abundant species in both PM1 and PM2.5, followed by organic mass (OM). Among the major water-soluble ions, SO(4)(2-)and NH4+ had higher concentrations in summer than in autumn, whereas the concentration of NO3- showed the opposite seasonal trend. Lower concentrations of organic carbon (OC), elemental carbon (EC) and water-soluble organic carbon (WSOC) were obtained in summer than in autumn. The water-soluble components (SOO42-, NO3-, NH4+ and WSOC) showed a clear diurnal variation due to the specific meteorological conditions of Mount Tai. The water content in PM1 and PM2.5 was enhanced by the water-soluble components, especially NH4NO3. The decreased visibility resulted from the combined influence of particulate matter and relative humidity (RH). The threshold PM2.5 concentration corresponding to a visibility of