| 上海市春季臭氧和二次有机气溶胶生成潜势的估算 |
| 摘要点击 3886 全文点击 1978 投稿时间：2013-07-01 修订日期：2013-07-22 |
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| 中文关键词 挥发性有机物 二次有机气溶胶 臭氧 最大臭氧生成潜势量 气溶胶生成系数 |
| 英文关键词 volatile organic compounds(VOCs) secondary organic aerosol ozone maximum ozone formation potential fractional aerosol coefficient |
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| 中文摘要 |
| 利用在线气相色谱-氢火焰离子化 (GC-FID) 监测系统对上海市市区和郊区的55种挥发性有机物(VOCs, C2~C12)进行了自动连续监测,结合最大臭氧生成潜势量(ΦOFP)和气溶胶生成系数(FAC)对上海市春季市区和郊区的臭氧和二次有机气溶胶(SOA)的生成潜势进行了估算. 结果表明上海市春季市区VOCs体积分数为33.9×10-9, 烷烃、烯烃和芳香烃的体积分数分别为:14.7×10-9、9.3×10-9和7.7×10-9; 郊区VOCs体积分数水平为20.2×10-9, 烷烃、烯烃和芳香烃的体积分数分别为:4.3×10-9、1.8×10-9和13.9×10-9; 用最大臭氧生成潜势量(ΦOFP)对春季市区和郊区ΦOFP进行评估,结果表明上海市春季市区和郊区VOCs各组分的ΦOFP分别为247.6 μg·m-3和422.9 μg·m-3,市区VOCs的ΦOFP为郊区的0.58倍; 市区烷烃和烯烃的ΦOFP分别为郊区的2.2和2.1倍,而市区芳香烃的ΦOFP却仅为郊区的0.34倍; 此外,利用气溶胶生成系数(FAC) 对上海市春季市区和郊区 SOA 的生成量进行估算,结果显示市区和郊区的SOA生成潜势量分别为2.04 μg·m-3和4.04 μg·m-3,其中市区烷烃和芳香烃的SOA 生成量分别占总SOA生成潜势的13.2% 和86.8%,郊区烷烃和芳香烃的SOA 生成量分别占总SOA生成潜势2.7% 和97.3%; 说明上海郊区SOA生成潜势量为市区的2倍,SOA生成贡献较大的前体物主要为芳香烃和高碳烷烃. |
| 英文摘要 |
| The concentration and speciation of ambient volatile organic compounds (VOCs) in Shanghai downtown and suburban areas were analyzed and measured by using online gas chromatography with flame ionization detection systems (GC-FID) during the spring period (from Mar. 1st to Mar. 31st, 2013) and 55 kinds of VOCs were detected. Maximum ozone formation potential (ΦOFP) and Fractional aerosol coefficients (FAC) were also used to estimate the formation potential of ozone (O3) and secondary organic aerosols (SOA). The results showed that the average concentrations of VOCs were respectively 33.9×10-9 and 20.2×10-9 in the downtown and suburban of shanghai. The main components were alkanes (14.7×10-9), aromatics (7.7×10-9) and alkenes (9.3×10-9) in the downtown; and the main components were alkanes (4.3×10-9), aromatics (13.9×10-9) and alkenes (1.8×10-9) in the suburban. Furthermore, ΦOFP (in the downtown) was 0.58 times of the ΦOFP (in the suburban), while ΦOFP (alkanes) and ΦOFP (alkenes) were 2.2 and 2.1 times in the downtown than suburban, but aromatics was only 0.34 times in the downtown than suburban. Fractional aerosol coefficients (FAC) were also used to estimate the potential formation of secondary organic aerosols (SOA) and the SOA concentration values in the downtown and suburban were 2.04 and 4.04 μg·m-3, respectively. SOA formations from aromatics and alkanes in the downtown contributed 13.2% and 86.8% and in the suburban contributed 2.7% and 97.3% to the total SOA formation potential. Aromatics and high-C alkanes were the main components that contributed to the SOA formations in both downtown and suburban of Shanghai in spring. |
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