Chemical characteristics of PM2.5 lduring summer at a background site of the Yangtze River Delta in China
Chemical characteristics of PM2.5 lduring summer at a background site of the Yangtze River Delta in China
复制标题
中国长江三角洲背景点夏季PM2.5化学特征
DOI：
10.1016/j.atmosres.2017.08.012
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发表时间：
2017
影响因子：
5.5
通讯作者：
Ma Qianli
中科院分区：
文献类型：
--
作者：
Liang Linlin;Engling Guenter;Zhang Xiaoye;Sun Junying;Zhang Yangmei;Xu Wanyun;Liu Chang;Zhang Gen;Liu Xuyan;Ma Qianli
With rapid economic development and urbanization, particular attention has been paid to atmospheric chemical studies in the Yangtze River Delta in China. PM2.5samples were collected by a MiniVol™ air sampler in summer time at a background site of the Yangtze River Delta in China. Carbonaceous components, i.e., OC and EC, levoglucosan and water-soluble inorganic ions, including sulfate, nitrate, ammonium, etc., were quantified. The average concentration of PM2.5in summer at Lin'an was 30.19 ± 8.86 μg m−3, lower than previous studies reported, confirming that air pollution in China is improving, e.g., by emission control measures and subsequent reduction in PM emissions in China. Investigating the relationship among sulfate, nitrate and ammonium showed that SO42−existed as (NH4)2SO4, while NO3−may have been present as NaNO3and KNO3. Based on molecular tracers, synoptic data as well as air mass back trajectory analysis, it was revealed that regional transport and stable synoptic conditions both play an important role in controlling the variations of aerosol chemical components. The comparison of chemical species between clean and hazy days showed that secondary organic and inorganic aerosols have different production processes. Secondary organic carbon (SOC) was much more important during clean days, while secondary inorganic aerosol species were readily produced and consequently became more important during polluted periods in Lin'an during summer time.
