| 贵阳市花溪城区大气PM2.5中碳质气溶胶的变化特征及来源解析 |
| 摘要点击 774 全文点击 151 投稿时间：2023-04-14 修订日期：2023-05-29 |
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| 中文关键词 PM2.5 碳质气溶胶 二次有机碳 来源解析 花溪 |
| 英文关键词 PM2.5 carbonaceous aerosol secondary organic carbon source apportionment Huaxi |
| 作者 | 单位 | E-mail | | 桂佳群 | 贵州大学资源与环境工程学院, 贵州喀斯特环境生态系统教育部野外科学观测研究站, 喀斯特地质资源与环境教育部重点实验室, 贵阳 550025 | 1523616119@qq.com | | 杨员 | 贵州省环境科学研究设计院, 贵阳 550081 | | | 王显钦 | 贵州大学资源与环境工程学院, 贵州喀斯特环境生态系统教育部野外科学观测研究站, 喀斯特地质资源与环境教育部重点实验室, 贵阳 550025 | | | 李云武 | 贵州大学资源与环境工程学院, 贵州喀斯特环境生态系统教育部野外科学观测研究站, 喀斯特地质资源与环境教育部重点实验室, 贵阳 550025 | | | 闫广轩 | 河南师范大学环境学院, 新乡 453007 | | | 徐鹏 | 贵州大学资源与环境工程学院, 贵州喀斯特环境生态系统教育部野外科学观测研究站, 喀斯特地质资源与环境教育部重点实验室, 贵阳 550025 | |
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| 中文摘要 |
| 碳质气溶胶作为大气气溶胶的重要组成部分，对大气环境质量、人类健康及全球气候变化有着重要的影响.为探究贵阳市花溪城区大气细颗粒物（PM2.5）中碳质气溶胶的变化特征及来源，于2020年不同季节开展大气PM2.5原位观测研究，利用热/光学碳分析仪（DRI Model 2015）测定大气PM2.5的碳质组分.结果表明，观测期间大气ρ（PM2.5）、ρ[总碳质气溶胶（TCA）]、ρ[有机碳（OC）]、ρ[二次有机碳（SOC）]和ρ[元素碳（EC）]的平均值分别为：（39.7±22.3）、（14.1±7.2）、（7.6±3.9）、（4.4±2.6）和（2.0±1.0）μg·m-3，OC/EC的平均值为（3.9±0.8）.ρ（PM2.5）、ρ（TCA）、ρ（OC）、ρ（SOC）和ρ（EC）呈现冬季最高[（52.6±28.6）、（17.0±9.6）、（9.1±5.2）、（6.1±3.9）和（2.4±1.2）μg·m-3]，夏季最低[（25.1±7.1）、（11.6±3.6）、（6.3±1.9）、（3.7±1.2）和（1.6±0.6）μg·m-3]的季节变化特征.OC/EC季节变化呈现：夏季（4.2±0.8）>冬季（3.8±0.9）>秋季（3.8±0.5）>春季（3.7±0.9），表明花溪城区各季节均存在SOC生成.SOC与OC呈现显著相关（R2=0.9），且随着大气氧化性增强，SOC浓度呈增加趋势.OC与EC各季节均呈现较好相关性，其中秋季最高（R2=0.9），其他3个季节偏低（R2为0.74~0.75），表明二者具有共同来源.通过OC/EC值范围初步判断碳质气溶胶来源于机动车尾气排放、燃煤排放和生物质燃烧排放.为了进一步定量解析主要排放源对碳质气溶胶的贡献，利用PMF模型对碳质气溶胶来源解析，结果表明贵阳市花溪城区碳质气溶胶主要来源为燃煤源（29.3%）、机动车排放源（21.5%）和生物质燃烧源（49.2%）. |
| 英文摘要 |
| Carbonaceous aerosol, as an important component of atmospheric aerosol, has a significant impact on atmospheric environmental quality, human health, and global climate change. To investigate the characteristics and sources of carbonaceous aerosol in atmospheric fine particulate matter (PM2.5) in Huaxi District of Guiyang, an in-situ observational study was conducted during different seasons in 2020, and the carbonaceous components of PM2.5 were measured using a thermal-optical carbon analyzer (DRI Model 2015). The results of the study showed that the average concentrations of PM2.5, total carbonaceous aerosol (TCA), organic carbon (OC), secondary organic carbon (SOC), and elemental carbon (EC) concentrations during the observation period were (39.7±22.3), (14.1±7.2), (7.6±3.9), (4.4±2.6), and (2.0±1.0) μg·m-3, respectively, and the mean value of OC/EC was (3.9±0.8). ρ(PM2.5), ρ(TCA), ρ(OC), ρ(SOC), and ρ(EC) showed a seasonal variation pattern with the highest in winter [(52.6±28.6), (17.0±9.6), (9.1±5.2), (6.1±3.9), and (2.4±1.2) μg·m-3, respectively] and the lowest in summer [(25.1±7.1), (11.6±3.6), (6.3±1.9), (3.7±1.2), and (1.6±0.6) μg·m-3, respectively]. The seasonal variation in OC/EC showed summer (4.2±0.8) > winter (3.8±0.9) > autumn (3.8±0.5) > spring (3.7±0.9), indicating the presence of SOC generation in all seasons in Huaxi District. SOC showed a significant correlation with OC (R2 =0.9), and the SOC concentration tended to increase with the increase in atmospheric oxidation. OC showed a good correlation with EC in all seasons, with the highest in autumn (R2 =0.9) and lower correlations in the other three seasons (R2 ranged from 0.74 to 0.75), indicating a common source. According to OC/EC ratio range, it was preliminarily determined that carbonaceous aerosol came from vehicle exhaust emissions, coal burning emissions, and biomass combustion emissions. In order to further quantify the contribution of major emission sources to carbonaceous aerosol, the results of this study using PMF to analyze the sources of carbonaceous aerosol showed that the main sources of carbonaceous aerosol in Huaxi District of Guiyang were coal combustion sources (29.3%), motor vehicle emission sources (21.5%), and biomass combustion sources (49.2%). |
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