| 河北香河亚微米气溶胶组分特性、来源及其演变规律分析 |
| 摘要点击 3222 全文点击 1328 投稿时间：2017-12-12 修订日期：2018-01-17 |
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| 中文关键词 颗粒物化学组分监测仪(ACSM) PM1 化学组分 有机气溶胶 正交矩阵因子分解法 秸秆燃烧 |
| 英文关键词 aerosol chemical speciation monitor (ACSM) PM1 chemical composition organic aerosol positive matrix factorization (PMF) straw burning |
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| 中文摘要 |
| 霾的形成发展与细颗粒物化学组分变化紧密相关.本文利用颗粒物化学组分监测仪（ACSM）、黑碳仪等对河北香河夏季亚微米气溶胶（PM1）化学组分、来源及其演变规律进行详细分析.结果表明，PM1平均占到PM2.5的约71%，PM1主要分布在20~80 μg·m-3间；观测期间有显著的秸秆燃烧事件，秸秆燃烧时段PM1质量浓度显著升高，其中有机物质量分数迅速升高，平均约占到47%；秸秆燃烧使得大气气溶胶由弱碱性转变为弱酸性；整个观测期间，正交矩阵因子分解法（PMF）共识别出4类有机气溶胶，分别为两种一次有机气溶胶（类烃类有机气溶胶和生物质燃烧有机气溶胶）和两种二次有机气溶胶（低挥发、高氧化性的有机气溶胶和低氧化、半挥发性的有机气溶胶），有机气溶胶氧化程度较高.其中二次有机气溶胶的贡献远大于一次有机气溶胶，平均占到有机物的~69%，而去除秸秆燃烧时段后PMF结果中未解析出生物质燃烧有机气溶胶. |
| 英文摘要 |
| Haze formation is closely related to the chemical composition of fine particles. An aerosol chemical speciation monitor (ACSM), aethalometer, etc. were used to investigate the chemical components、 source, and evolution of submicron particles at Xianghe, a suburban site located between the megacities of Beijing and Tianjin from May 31 to June 30, 2013. The results suggest that the air quality in Xianghe has suffered severe deterioration, which is imminent to improve air quality and pollution. On average, PM1 accounted for ~71% of PM2.5 and PM1 distributed in 20-80 μg·m-3 mainly. Organic aerosols had a high degree of oxidation. Significant straw burning events were observed during June 2013 in Xianghe. During the straw burning period, the mass concentration of PM1 significantly increased and the mass fraction of organic aerosols in PM1 rapidly increased to about 47%, on average. The contribution of nitrate was generally greater than that of other inorganic components. Affected by the straw burning events, the aerosol acidity turns from weak alkaline to weak acid. Positive matrix factorization was performed on the ACSM OA mass spectra, which identified two primary OA (POA), i.e., BBOA and HOA, and two secondary OA (SOA), i.e., LV-OOA and SV-OOA, factors. The SOAs dominated the OAs during the observation, contributing ~69% of OAs. However, after the straw burning period was removed, the positive matrix factorization (PMF)results did not reveal biomass combustion organic aerosols. |
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