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广州城区夏季大气颗粒物数浓度谱分布特征

韩冰雪 张国华 毕新慧 王新明 盛国英 傅家谟

韩冰雪, 张国华, 毕新慧, 王新明, 盛国英, 傅家谟. 广州城区夏季大气颗粒物数浓度谱分布特征[J]. 环境科学研究, 2015, 28(2): 198-204.
引用本文: 韩冰雪, 张国华, 毕新慧, 王新明, 盛国英, 傅家谟. 广州城区夏季大气颗粒物数浓度谱分布特征[J]. 环境科学研究, 2015, 28(2): 198-204.
HAN Bingxue, ZHANG Guohua, BI Xinhui, WANG Xinming, SHENG Guoying, FU Jiamo. Pollution Characteristics of Atmospheric Particle Size and Number Concentrations during Summer in Urban Area of Guangzhou[J]. Research of Environmental Sciences, 2015, 28(2): 198-204.
Citation: HAN Bingxue, ZHANG Guohua, BI Xinhui, WANG Xinming, SHENG Guoying, FU Jiamo. Pollution Characteristics of Atmospheric Particle Size and Number Concentrations during Summer in Urban Area of Guangzhou[J]. Research of Environmental Sciences, 2015, 28(2): 198-204.

广州城区夏季大气颗粒物数浓度谱分布特征

基金项目: 中国科学院战略性先导科技专项(B类)(XDB05020205)

Pollution Characteristics of Atmospheric Particle Size and Number Concentrations during Summer in Urban Area of Guangzhou

  • 摘要: 于2013年6月2日—7月15日,利用扫描迁移性粒谱仪(SMPS)对广州城区大气17~800 nm的粒子谱进行了连续观测,同时结合在线小时ρ(PM2.5)及气象数据,对颗粒物污染特征进行了分析. 结果表明:观测期间,凝结核模态粒子、爱根核模态粒子、积聚模态粒子的数浓度范围分别为68~7 687、1 009~47 724、238~14 781 cm-3.平均数浓度谱及体积谱均呈单峰分布,峰值分别出现在50和300 nm左右. 根据双模态对数正态分布模型对平均数浓度谱拟合的结果可知,爱根核模态粒子和积聚核模态粒子的几何平均粒径分别为48和144 nm. 颗粒物数浓度及其谱分布日变化特征明显,在交通高峰及太阳辐射较强的时间段均出现峰值. 在观测阶段,粒子增长现象频繁发生,推测大气光化学反应引起的气-粒转化是广州城区夏季大气颗粒物的重要来源. 7月12—13日广州城区发生了一次典型的大气污染过程,ρ(PM2.5)由18 μg/m3增至112 μg/m3,能见度降至8 km. 在该时间段,积聚模态粒子体积分数与ρ(PM2.5)变化一致,R2(相关系数)达到了0.85. 后向轨迹分析表明,污染气团主要来自于西南方向,在陆地停留时间较长.

     

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  • 刊出日期:  2015-02-25

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