| 北京乡村地区分粒径气溶胶OC及EC分析 |
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| 引用本文： | 颜鹏,郇宁,张养梅,周怀刚.北京乡村地区分粒径气溶胶OC及EC分析[J].应用气象学报,2012,23(3):285-293. |
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| 作者姓名： | 颜鹏 郇宁 张养梅 周怀刚 |
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| 作者单位： | 1.中国气象局气象探测中心，北京 100081 |
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| 基金项目： | 国家自然科学基金项目（40975083，40433008），科技部公益性研究项目（2001DIAI0009） |
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| 摘 要： | 利用北京上甸子区域大气本底站2004年观测的分粒径大气气溶胶资料，分析了气溶胶中有机碳 (OC) 及元素碳 (EC) 的质量浓度水平、季节变化、尺度分布特征、OC与EC比值及其相关性。结果显示:上甸子站总悬浮颗粒物 (TSP) 中OC平均质量浓度为7.5~31.5 μg·m-3，EC质量浓度为1.4~6.6 μg·m-3；PM2.1(粒径小于2.1 μm) 中OC质量浓度为4.0~19.1 μg·m-3，EC质量浓度大约为0.8~4.3 μg·m-3。冬季OC及EC质量浓度明显高于其他季节，其中冬、夏、秋季OC及EC峰值粒径出现为0.65~2.1 μm，但在春季峰值粒径移至2.1~4.7 μm。观测期间，OC与EC质量浓度比值平均为4~6，该比值略高于文献报道的我国一些城市地区的观测结果。
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| 关 键 词： | 气溶胶 有机碳 元素碳 尺度分布 |
| 收稿时间： | 2011-09-16 |
| 修稿时间： | 2/4/2012 12:00:00 AM |
Size Resolved Aerosol OC, EC at a Regional Background Station in the Suburb of Beijing |
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| Yan Peng,Huan Ning,Zhang Yangmei and Zhou Huaigang.Size Resolved Aerosol OC, EC at a Regional Background Station in the Suburb of Beijing[J].Quarterly Journal of Applied Meteorology,2012,23(3):285-293. |
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| Authors: | Yan Peng Huan Ning Zhang Yangmei and Zhou Huaigang |
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| Institution: | 1.CMA Meteorological Observation Center, Beijing 1000812.Chinese Academy of Meteorological Sciences, Beijing 1000813.Beijing Municipal Environmental Bureau, Beijing 1000804.Shangdianzi Atmospheric Background Station, Beijing 101507 |
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| Abstract: | Carbonaceous aerosols constitute major component of atmospheric aerosols. In Feburay, May, July and September of 2004, size resolved aerosol sampling measurements are conducted respectively at Shangdianzi Regional Atmospheric Background Monitoring Station which is in the suburb of Beijing, to represent the four seasons of the year. OC, EC are analyzed in the lab with Sunset OC/EC Analyzer (NIOSH TOT method, Sunset Lab, USA). The seasonal variations and size distributions of OC and EC composition are characterized, and correlations between OC and EC are discussed as well. The analysis shows that the mean concentration of OC for TSP (Total Suspend Particles) at Shangdianzi Station in the four seasons ranges from 7.5 μg·m-3 to 31.5 μg·m-3, and EC ranges from 1.4 μg·m-3 to 6.6 μg·m-3. As to PM2.1 (particles with aerodynamic diameter less than 2.1 μm), the mean concentrations are from about 4.0 μg·m-3 to 19.1 μg·m-3 for OC, and from about 0.8 μg·m-3 to 4.3 μg·m-3 for EC. The significant seasonal variations of mean OC, EC at Shangdianzi are found with the highest OC and EC concentration appearing in winter and lowest in summer. The size distributions of OC and EC at the Shangdianzi Station shows obvious seasonal differences, with OC and EC peak size at 0.65—2.1 μm during the winter, summer and fall time, and shifts to 2.1—4.7 μm during the spring time. In summer and fall, the OC and EC are mostly concentrated in the fine particles (with particle size less than 2.1 μm). In spring, the size distributions of OC and EC are quite different, where there is a significant enhancement OC, EC mass contents in the coarse particles, which is related to the collision of carbonaceous aerosols with dust particles rich in the spring atmosphere. The mass of organic matter (OM]=1.4OE]) in PM2.1 accounts for about 43%—80% of the total mass of OM, and EC in PM2.1 accounts for 54%—70% of total EC. The average ratio of OC and EC for the whole period of sampling is about 4.0—6.0, which is similar with the reported values obtained at many urban sites of China, when considering the difference between the OC, EC laboratory analysis methods. The square correlation coefficients (R2) between OC and EC in winter, spring and fall are 0.84, 0.81, and 0.73 respectively. However, the correlation coefficient is lowest in summer, with R2 about 0.49. This seasonal pattern of correlations indicates the complications for sources and production or removal processes of the carbonaceous aerosols in summer time in that region. |
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| Keywords: | aerosol organic carbon(OC) elemental carbon(EC) size distributions |
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