| 2010年长江三角洲临安本底站PM2.5理化特征 |
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| 引用本文： | 孟昭阳,贾小芳,张仁健,俞向明,马千里.2010年长江三角洲临安本底站PM2.5理化特征[J].应用气象学报,2012,23(4):424-432. |
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| 作者姓名： | 孟昭阳 贾小芳 张仁健 俞向明 马千里 |
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| 作者单位： | 1.中国气象科学研究院 中国气象局大气化学重点开放实验室，北京 100081 |
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| 基金项目： | 资助项目：国家自然科学基金项目（40975081），国家重点基础研究发展规划项目（2010CB428503） |
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| 摘 要： | 2010年在代表长三角区域背景地区的浙江省临安区域大气本底站开展了对大气细粒子PM2.5为期1年的地面观测，并对细粒子中水溶性离子和碳组分的季节变化特征进行了分析。临安2010年大气中PM2.5质量浓度平均为 (58.2±50.8) μg·m－3，PM2.5质量浓度季节变化明显。利用HYSPLIT4模式计算了2010年临安72 h后向轨迹，根据轨迹计算与聚类结果，结合地面观测的PM2.5数据进行了分析。研究表明:临安地区因受到长江三角洲区域及偏北气流引起的污染传输影响，呈现出高细粒子水平特征。PM2.5中总水溶性离子年平均质量浓度为 (28.5±17.7) μg·m－3，占PM2.5质量浓度的47%。其中，气溶胶组分SO42-，NO3-和NH4+所占比例最大，共占总水溶性离子的69%。PM2.5中有机碳和元素碳的年平均质量浓度分别为 (10.1±6.7) μg·m－3和 (2.4±1.8) μg·m－3。有机碳和元素碳质量浓度显著相关，表明有机碳和元素碳主要来自相同的排放源。
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| 关 键 词： | 区域本底站 PM2.5 水溶性离子 有机碳 元素碳 |
| 收稿时间： | 2012-02-27 |
Characteristics of PM2.5 at Lin’an Regional Background Station in the Yangtze River Delta Region |
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| Meng Zhaoyang,Jia Xiaofang,Zhang Renjian,Yu Xiangming and Ma Qianli.Characteristics of PM2.5 at Lin’an Regional Background Station in the Yangtze River Delta Region[J].Quarterly Journal of Applied Meteorology,2012,23(4):424-432. |
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| Authors: | Meng Zhaoyang Jia Xiaofang Zhang Renjian Yu Xiangming and Ma Qianli |
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| Institution: | 1.Key Laboratory for Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing 1000812.Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 1000293.Lin'an Regional Air Background Station, Lin'an 311307 |
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| Abstract: | 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. |
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