| 2022年8月成渝两地臭氧污染差异影响因素分析 |
| 摘要点击 994 全文点击 261 投稿时间：2023-01-04 修订日期：2023-03-09 |
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| 中文关键词 O3污染 影响因素 传输轨迹 前体物排放水平 O3生成潜势 |
| 英文关键词 O3 pollution influencing factors transmission track precursor emission level O3 formation potential |
| 作者 | 单位 | E-mail | | 陈木兰 | 重庆市生态环境科学研究院, 城市大气环境综合观测与污染防控重庆市重点实验室, 重庆 401147 | chenmulan18@mails.ucas.ac.cn | | 李振亮 | 重庆市生态环境科学研究院, 城市大气环境综合观测与污染防控重庆市重点实验室, 重庆 401147 | zhenliangli@163.com | | 彭超 | 重庆市生态环境科学研究院, 城市大气环境综合观测与污染防控重庆市重点实验室, 重庆 401147 | | | 邓也 | 成都市环境保护科学研究院, 成都市大气科研重点实验室, 成都 610072 | | | 宋丹林 | 成都市环境保护科学研究院, 成都市大气科研重点实验室, 成都 610072 | | | 谭钦文 | 成都市环境保护科学研究院, 成都市大气科研重点实验室, 成都 610072 | tanqw@cdaes.org.cn |
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| 中文摘要 |
| 2022年8月成都和重庆呈现显著的臭氧（O3）污染差异,成都O3污染天高达20 d,重庆无O3污染天,本文从前体物排放水平和气象条件分析此差异的影响因素.结果表明：①成都52种挥发性有机物（VOCs）（包含26种烷烃、16种芳香烃和10种烯烃）的总体积分数（18.8 × 10-9）是重庆（6.6 × 10-9）的2.8倍,总O3生成潜势（OFP=51.2 × 10-9）是重庆（25.0 × 10-9）的2.0倍,总·OH损耗速率（L·OH=3.9 s-1）是重庆（2.3 s-1）的1.7倍.成都OFP前3是乙烯、间/对-二甲苯和异戊二烯；重庆OFP前3是异戊二烯、乙烯和丙烯.重庆仅烯烃对O3的贡献率是60.7％,而成都烯烃和芳香烃的OFP分别是重庆的1.6倍和2.9倍.综上,成都VOCs总体积分数、大气光化学活性和O3生成潜势均较重庆高.②成渝两地L·OH排名第1均为异戊二烯,表明8月O3污染生物源贡献显著,但生物源排放活性与温度存在响应关系,8月14~24日重庆高温（38.3℃）使得生物源排放活性下降,而成都温度（34.9℃）加剧了生物源排放活性.③重庆水平、垂直大气扩散条件整体优于成都,且成都受到了区域性污染传输的影响. |
| 英文摘要 |
| In August 2022, Chengdu and Chongqing showed significant differences in ozone (O3) pollution. Chengdu had O3 pollution days for 20 days, whereas Chongqing had no O3 pollution days. In this study, we analyzed the influencing factors of this difference from the emission level of precursors and meteorological conditions. The results showed that:① the total mixing ratio of 52 VOCs (volatile organic compounds) (including 26 alkanes, 16 aromatics, and 10 alkenes) in Chengdu (18.8×10-9) was 2.8 times that of Chongqing (6.6×10-9), and the total O3 formation potential (OFP) (51.2×10-9) was 2.0 times that of Chongqing (25.0×10-9). The·OH radical loss rate (L·OH) (3.9 s-1) was 1.7 times that of Chongqing (2.3 s-1). The top three OFP in Chengdu were ethylene, m/p-xylene, and isoprene, and those in Chongqing were isoprene, ethylene, and propylene. The contribution rate of alkenes to O3 in Chongqing was 60.7%, whereas the OFP of alkenes and aromatics in Chengdu were 1.6 times and 2.9 times that in Chongqing. In conclusion, the total mixing ratio of VOCs, atmospheric photochemical activity, and O3 formation potential of Chengdu were higher than those of Chongqing. ② Isoprene was ranked first place in L·OH in both Chengdu and Chongqing, indicating that the contribution of biogenic sources to O3 pollution in August was significant. However, the biogenic source emission activity was in response to temperature. From August 14 to 24, the high temperature in Chongqing (38.3℃) decreased biogenic source emission activity, whereas the temperature in Chengdu (34.9℃) increased the biogenic sources emission activity. ③ The horizontal and vertical atmospheric diffusion conditions of Chongqing were better than those of Chengdu, and Chengdu was affected by regional pollution transmission. |
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