Meng Zhaoyang, Jia Xiaofang, Zhang Renjian, et al. Characteristics of PM2.5 at Lin'an regional background station in the Yangtze River Delta Region. J Appl Meteor Sci, 2012, 23(4): 424-432.
Citation: Meng Zhaoyang, Jia Xiaofang, Zhang Renjian, et al. Characteristics of PM2.5 at Lin'an regional background station in the Yangtze River Delta Region. J Appl Meteor Sci, 2012, 23(4): 424-432.

Characteristics of PM2.5 at Lin'an Regional Background Station in the Yangtze River Delta Region

  • Received Date: 2012-02-27
  • Rev Recd Date: 2012-05-31
  • Publish Date: 2012-08-31
  • A ground-based observation of fine particles (PM2.5) is conducted in 2010 at Lin'an regional background station in the Yangtze River Delta region. Daily PM2.5 samples are collected by Mini-Vol portable aerosol sampler on 47 mm quartz filters with the flow of 5 L/min. A total of 223 valid PM2.5 samples are collected in 2010. The concentrations of Na+, NH4+, K+, Mg2+, Ca2+, F-, Cl-, NO3- and SO42- in PM2.5 are determined by using Dionex 600 Ion Chromatography. EC and OC in PM2.5 are determined by DRI Model 2001A Thermal/Optical Carbon Analyzer. The mass concentration of PM2.5 at Lin'an Stationranges from 1.4 to 442 μg·m-3, with the annual average concentration (58.2 ± 50.8) μg·m-3 during 2010. Seasonal variation of PM2.5 concentrations is significant. The concentrations of PM2.5 are 70.3, 28.9, 66.2 μg·m-3 and 77.4 μg·m-3 in spring, summer, autumn and winter, respectively. To gain an insight into the impact of transport on PM2.5 levels at Lin'an, air mass backward trajectories are calculated and analyzed in combination with corresponding pollutants concentrations using the HYSPLIT4 model. The results indicate that the site is under significant regional-scale influence of the long-range transport from the Yangtze River Delta region and northern China. The annual concentration of total water-soluble inorganic ions is (28.5±17.7) μg· m-3, contributing an average of 47% of PM2.5 mass concentrations. In PM2.5, the concentrations of the most abundant ionic species following the order of SO42-, NO3-, NH4+, Cl-, Na+, Ca2+, K+, F- and Mg2+. Three major ions SO42-, NO3- and NH4+ account for 69% of the total water-soluble inorganic ions. The annual mean concentrations of OC and EC are (10.1±6.7) μg·m-3 and (2.4±1.8) μg·m-3, respectively. The concentrations vary in ranges with 0.8—29.8 μg·m-3 for OC and 0.03—8.6 μg·m-3 for EC. The average concentrations of OC and EC are highest in autumn and lowest in summer. The concentrations of OC and EC are (15.3±6.5) μg·m-3 and (3.6±1.5) μg·m-3 in autumn, while (4.8±2.2) μg·m-3 and (1.2±0.6) μg·m-3 for OC and EC in summer, respectively. OC and EC show a significant correlation, indicating that OC and EC are mainly from the same sources.
  • Fig. 1  The monthly mean concentration of PM2.5 and meteorological parameter in 2010

    Fig. 2  72-hour backward trajectories at Lin'an during 2010

    Fig. 3  Ions balance in PM2.5

    Fig. 4  Correlation of NH4+ to SO42- and NO3- molar concentration in PM2.5

    Fig. 5  Seasonal variations of OC and EC in PM2.5

    Fig. 6  Correlation of OC and EC in PM2.5

    Table  1  Mean PM2.5 concentrations corresponding to different clusters of trajectories for Lin'an in 2010(unit:μg·m-3)

    分析物种 轨迹1 轨迹2 轨迹3 轨迹4 轨迹5 轨迹6 轨迹7
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    Table  2  Seasonal variation of PM2.5 water-soluble ions concentration (unit:μg·m-3)

    分析物种 春季 夏季 秋季 冬季 全年
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    Table  3  Correlations of ions in PM2.5

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    • Received : 2012-02-27
    • Accepted : 2012-05-31
    • Published : 2012-08-31


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