期刊
ENVIRONMENTAL POLLUTION
卷 197, 期 -, 页码 68-75出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2014.11.028
关键词
PM2.5; Chemical composition; Meteorological parameter; SOA; Aqueous-phase reaction
资金
- National Natural Science Foundation of China [21307067, 21190054]
- International Postdoctoral Exchange Fellowship Program
Heavily-polluted PM2.5 (fine particulate matter) episodes frequently impacting Beijing, especially during winter, have become a substantial concern. We found that during winter, the daily variation of PM2.5 in Beijing tracked the pattern of relative humidity (RH). With the increase of PM2.5 (or RH), water-soluble components (especially inorganic ions) became more abundant, and the water-soluble organic carbon to organic carbon ratios increased. The nitrate to sulfate ratios also exhibited dependence on RH, and were higher than those measured about a decade ago, consistent with the increasing trend of nitrogen oxides emissions. Surprisingly, the ratios of water-insoluble organic carbon to elemental carbon showed significant increase at high RH levels, presumably indicating the formation of secondary organic aerosol that is not soluble in water. In addition, humid winters were occasionally identified during 1996-2013 which are expected to be favorable for the formation of air pollution episodes with high PM2.5 concentrations. (C) 2014 Elsevier Ltd. All rights reserved.
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