• 关键词：臭氧  敏感性分析  相对增量反应活性(RIR)  EKMA曲线  收支分析

• 基金项目：国家重点研发计划项目（No.2018YFC0214001）；四川省生态环境厅重点专项项目（"长江驻点研究"课题三）

• 韩丽
• 四川省生态环境科学研究院, 成都 610041

• 陈军辉
• 四川省生态环境科学研究院, 成都 610041

• 姜涛
• 四川省生态环境科学研究院, 成都 610041

• 徐晨曦
• 四川省生态环境科学研究院, 成都 610041

• 李英杰
• 四川省生态环境科学研究院, 成都 610041

• 王成辉
• 四川省生态环境科学研究院, 成都 610041

• 王波
• 四川省生态环境科学研究院, 成都 610041

• 钱骏
• 四川省生态环境科学研究院, 成都 610041

• 刘政
• 四川省生态环境科学研究院, 成都 610041

• 摘要：2019年4—8月，在成都市城区开展了O₃、NO_x、VOCs及气象参数的连续在线观测，基于观测数据OBM模拟的方式，对O₃超标日的敏感性及收支进行了分析.研究发现，成都市城区O₃超标日对应的绝大部分前体物的浓度均有所上升，基于VOCs的组分变化分析推断工业源排放在超标日可能存在较大幅度的增加.相对增量反应活性（RIR）值结果表明，成都市城区O₃超标日对人为源VOCs（AVOCs）敏感性最强，其次为天然源（BVOCs）和CO，而对NO_x为负敏感性，控制AVOCs对站点超标日的O₃浓度下降最为有利；逐月变化来看，O₃对AVOCs和NO_x的敏感性逐月差异较小，对BVOCs的敏感性在6—7月最强，对CO的敏感性在4—5月最强.观测点位处于典型的VOCs控制区，以O₃浓度为等值线的EKMA曲线显示4—5月脊线比例约为13，6—7月及8月的脊线比例约为8.建议在开展O₃防控时，VOCs的减排比例应远大于NO_x，且春季的减排比例应大于夏季.典型O₃污染日的日最大O₃小时生成速率为10×10^-9~18×10^-9· h^-1，上午存在O₃输入，下午O₃本地生成占主导，其余时段O₃输出影响较强.

• Abstract：From April 2019 to August 2019, on-line measurements of ozone (O₃) and its precursors were conducted in Chengdu, China. An observation based model was used to study the in situ O₃ formation of and sensitivity of O₃ production to its precursors in O₃-unattainment days. The results showed that the concentrations of most O₃ precursors increased on episode days (days with maximum daily 8-hour O₃ > 160 μg·m^-3) relative to those on non-episode days, with significant enhancement of industrial emissions as indicated by the variations of corresponding tracers. The relative incremental reactivity (RIR) analysis revealed that O₃ formation was most sensitive to anthropogenic Volatile Organic Compounds (AVOCs), followed by biogenic VOCs (BVOCs) and CO, which however had negative sensitivity to NO_x. It meant that controlling AVOCs was most effective in reducing in situ O₃ production in the study period. The monthly average RIR values of AVOCs and NO_x were relatively stable, in contrast to the significant variations in RIRs of BVOCs and CO, which peaked in June—July and April—May, respectively. The localized Empirical Kinetic Modeling Approach (EKMA) curve again confirmed the generally VOC-limited regime governing O₃ formation, with the VOCs/NO_x dividing ratio of ~13 in April—May, and of ~8 in June—August. It was therefore suggested that the cutting percentages of VOCs should be much higher than those of NO_x for effective control of local O₃ production, and the cutting ratios of VOCs/NO_x in spring should be higher than in summer. During the study period, the maximum hourly O₃ production rate varied between 10×10^-9 and 18×10^-9·h^-1 on episode days. It was implied that net O₃ input generally occurred in the morning, while O₃ was dominated by in situ production in the afternoon and could be exported at other times.

• Key words：ozone  sensitivity analysis  RIR  EKMA  budget analysis

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