| 基于总过氧自由基观测研究合肥市西郊夏季O3生成特征 |
| 摘要点击 1570 全文点击 1950 投稿时间：2022-06-10 修订日期：2022-07-16 |
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| 中文关键词 臭氧(O3) 总过氧自由基(RO2* ·) 臭氧生成速率 臭氧生成敏感性 合肥市西郊夏季 |
| 英文关键词 ozone(O3) total peroxy radical(RO2*·) ozone production rate sensitivity of ozone generation summer in the western suburb of Hefei |
| 作者 | 单位 | E-mail | | 俞辉 | 中国科学院合肥物质科学研究院安徽光学精密机械研究所, 合肥 230031
中国科学技术大学研究生院科学岛分院, 合肥 230026 | 1755614257@qq.com | | 韦娜娜 | 中国科学院合肥物质科学研究院安徽光学精密机械研究所, 合肥 230031 | | | 徐学哲 | 中国科学院合肥物质科学研究院安徽光学精密机械研究所, 合肥 230031 | | | 刘芊芊 | 中国科学技术大学研究生院科学岛分院, 合肥 230026
中国科学技术大学环境科学与光电技术学院, 合肥 230026 | | | 姚易辰 | 中国科学院合肥物质科学研究院安徽光学精密机械研究所, 合肥 230031
中国科学技术大学研究生院科学岛分院, 合肥 230026 | | | 赵卫雄 | 中国科学院合肥物质科学研究院安徽光学精密机械研究所, 合肥 230031 | wxzhao@aiofm.ac.cn | | 张为俊 | 中国科学院合肥物质科学研究院安徽光学精密机械研究所, 合肥 230031
中国科学技术大学环境科学与光电技术学院, 合肥 230026 | |
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| 中文摘要 |
| 2020年8月利用化学放大法对合肥市西郊大气总过氧自由基RO2* ·（RO2 ·+HO2 ·）体积分数进行监测，并结合O3和其前体物，分析了过氧自由基体积分数、O3生成速率和O3生成对前体物的敏感性.结果表明，观测期间总过氧自由基体积分数的日均值呈典型的单峰型变化，12：00左右出现最高值，日间峰值体积分数为43.8×102* ·与太阳辐射强度、温度和O3呈明显的相关性.利用实测RO2* ·和NO，获得合肥市西郊夏季O3生成速率，日间峰值为10.6×10-9h-1，O3生成速率对NO变化更为敏感.基于大气自由基和NOx（NO+NO2）反应去除速率占比（Ln/Q），对合肥市西郊夏季O3生成敏感进行了分析，结果显示O3生成敏感具有明显日变化.早晨O3生成为VOCs控制区，上午O3生成为VOCs-NOx协同控制区，下午转变为NOx控制区. |
| 英文摘要 |
| In August 2020, the observations of total peroxy radical concentrations were carried out in the western suburb site of Hefei using a peroxy radical chemical amplifier (PERCA) instrument. The ozone production and its sensitivity were characterized with the measured O3 and its precursors. The results showed that the daily variation in total peroxy radical concentrations exhibited an obvious convex tend, with the highest value at approximately 12:00; the average peak peroxy radical concentration was 43.8×10-12; and the concentrations of the peroxy radical and ozone were driven by strong solar radiation and high temperature. The photochemical ozone production rate could be determined with peroxy radical and NO concentration. The average ozone peak production rate in summer was 10.6×10-9 h-1, which was more sensitive to NO concentration. Based on the ratio of the radical loss rate due to reactions with NOx to the radical loss rate (Ln/Q), the characteristics of O3 production in the western suburb of Hefei in summer were analyzed. The results showed that O3 production sensitivity varied greatly during the day. The summer O3 production regime shifted from the VOC-sensitive chemistry in the early morning to NOx-sensitive chemistry in the afternoon, and this regime transition typically occurred in the morning. |
