Highly time-resolved chemical characterization of atmospheric submicron particles during 2008 Beijing Olympic Games using an Aerodyne High-Resolution Aerosol Mass Spectrometer
Highly time-resolved chemical characterization of atmospheric submicron particles during 2008 Beijing Olympic Games using an Aerodyne High-Resolution Aerosol Mass Spectrometer
复制标题
使用 Aerodyne 高分辨率气溶胶质谱仪对 2008 年北京奥运会期间大气亚微米颗粒进行高度时间分辨化学表征
DOI：
10.5194/acp-10-8933-2010
复制
发表时间：
2010-01-01
影响因子：
6.3
通讯作者：
Worsnop, D. R.
中科院分区：
文献类型：
--
作者：
Huang, X. -F.;He, L. -Y.;Worsnop, D. R.
抽象的。作为 2008 年北京及周边地区空气质量研究活动 (CAREBeijing-2008) 的一部分，在 2008 年北京奥运会和残奥会期间（2008 年 7 月 24 日至 9 月 20 日），在北京城区部署了 Aerodyne 高分辨率飞行时间气溶胶质谱仪 (HR-ToF-AMS)，以表征亚微米气溶胶颗粒的特征。活动平均PM1质量浓度为63.1 ± 39.8 μg m−3；平均成分为有机物（37.9%）、硫酸盐（26.7%）、铵（15.9%）、硝酸盐（15.8%）、炭黑（3.1%）和氯化物（0.87%）。物种（BC 除外）的平均尺寸分布均以真空空气动力学直径在 600 nm 处达到峰值的积累模式为主，有机物的特征是延伸至 100 nm 以下的附加较小模式。高分辨率有机质谱数据集的正矩阵分解（PMF）分析将有机气溶胶分为四种成分，即碳氢化合物（HOA）、烹饪相关（COA）和两种含氧有机气溶胶（OOA-1和OOA-2），平均分别占总有机物质量的18.1%、24.4%、33.7%和23.7%。 HOA 被认为与主要燃烧源密切相关，而 COA 质谱和昼夜模式显示出与烹饪排放测量相似的特征。 OOA 成分对应于老化的二次有机气溶胶。尽管两种 OOA 成分具有相似的元素（O/C、H/C）组成，但它们在质谱和时间序列上表现出差异，这似乎与活动期间采样的不同源区域相关。回溯轨迹聚类分析表明，偏南气流与活动期间 PM1 污染最高相关。南部气团的气溶胶颗粒尤其富含无机和氧化有机物质。北部气团中的气溶胶颗粒含有大部分主要 HOA 和 COA 物种，可能是由于当地排放的影响较强。所有主要物种的最低浓度水平出现在奥运会期间（2008 年 8 月 8 日至 24 日），这可能是由于严格的排放控制和有利的气象条件的影响。
Abstract. As part of Campaigns of Air Quality Research in Beijing and Surrounding Region-2008 (CAREBeijing-2008), an Aerodyne High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS) was deployed in urban Beijing to characterize submicron aerosol particles during the time of 2008 Beijing Olympic Games and Paralympic Games (24 July to 20 September 2008). The campaign mean PM1 mass concentration was 63.1 ± 39.8 μg m−3; the mean composition consisted of organics (37.9%), sulfate (26.7%), ammonium (15.9%), nitrate (15.8%), black carbon (3.1%), and chloride (0.87%). The average size distributions of the species (except BC) were all dominated by an accumulation mode peaking at about 600 nm in vacuum aerodynamic diameter, and organics was characterized by an additional smaller mode extending below 100 nm. Positive Matrix Factorization (PMF) analysis of the high resolution organic mass spectral dataset differentiated the organic aerosol into four components, i.e., hydrocarbon-like (HOA), cooking-related (COA), and two oxygenated organic aerosols (OOA-1 and OOA-2), which on average accounted for 18.1, 24.4, 33.7 and 23.7% of the total organic mass, respectively. The HOA was identified to be closely associated with primary combustion sources, while the COA mass spectrum and diurnal pattern showed similar characteristics to that measured for cooking emissions. The OOA components correspond to aged secondary organic aerosol. Although the two OOA components have similar elemental (O/C, H/C) compositions, they display differences in mass spectra and time series which appear to correlate with the different source regions sampled during the campaign. Back trajectory clustering analysis indicated that the southerly air flows were associated with the highest PM1 pollution during the campaign. Aerosol particles in southern airmasses were especially rich in inorganic and oxidized organic species. Aerosol particles in northern airmasses contained a large fraction of primary HOA and COA species, probably due to stronger influences from local emissions. The lowest concentration levels for all major species were obtained during the Olympic game days (8 to 24 August 2008), possibly due to the effects of both strict emission controls and favorable meteorological conditions.