| 高温极端天气影响下的成都平原一次典型臭氧污染过程分析 |
| 摘要点击 1360 全文点击 108 投稿时间：2023-05-04 修订日期：2023-07-13 |
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| 中文关键词 高温极端天气 臭氧污染 让电于民 正定矩阵因子分解法（PMF） 潜在源贡献因子法（PSCF） 浓度轨迹加权法（CWT） |
| 英文关键词 high temperature extremes ozone pollution power rationing positive matrix factorization （PMF） potential source contribution function （PSCF） concentration weighted trajectory （CWT） |
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| 中文摘要 |
| 基于气象再分析资料及成都市芳邻路站点大气综合观测数据,采用PMF、PSCF和CWT等方法对成都市2022年发生的一次持续性臭氧（O3）污染过程进行分析.结果表明,本次污染过程持续了18 d,O3浓度最大8 h平均值第90百分位数达242.62 μg·m-3.由于副热带高压强大且长时间控制四川,气温屡创新高,成都市日最高温度达到41.63℃,异常持久高温强辐射为O3生成提供有利气象条件.面对持续高温干旱灾害性天气影响,四川电网面临极其严峻的保供形势,污染期间四川省多地出现不同程度的让电于民.分析对比让电前后空气质量科研数据发现：①让电后O3前体物NO2和VOCs浓度均有不同程度降低,O3浓度削峰效果较好；②让电后大气反应活性OFP和L·OH中烷烃和芳香烃贡献率均下降,但贡献前10物种贡献率较让电前提高,主要是因为高温所致植物排放异戊二烯增加；③从源解析结果来看,让电前后移动源、工业源和油气挥发源贡献率基本不变,天然源贡献率上升,溶剂源贡献率下降；④让电前成都近郊短距离传输叠加眉山一带传输对成都有影响,强潜在源位于主城区偏东区域,让电后潜在源区域缩小、强潜在源弱化、影响减弱,由此可见联防联控对成都市O3污染防治作用较大. |
| 英文摘要 |
| Based on meteorological reanalysis data and comprehensive atmospheric observation data from the Fanglin Road site in Chengdu, the positive matrix factorization （PMF）, potential source contribution function （PSCF）, and concentration weighted trajectory （CWT） methods were used to analyze a continuous ozone pollution process in Chengdu in 2022. The results showed that the process lasted 18d, with a maximum 8h mean 90th percentile O3 concentration of 242.62 μg·m-3. Owing to the strong and prolonged control of Sichuan by the subtropical high pressure, temperatures reached record highs, with a daily maximum temperature of 41.63℃ in Chengdu. The unusually high and persistent temperatures and strong radiation provided favorable meteorological conditions for ozone production. In the face of the catastrophic effects of persistent high temperatures and drought, the Sichuan power grid faced an extremely challenging situation to maintain supply. During the pollution period, power restrictions of varying degrees occurred in many parts of Sichuan province. In this study, we found that： ① concentrations of the ozone precursors NO2 and VOCs were reduced to varying degrees after the power restriction, and the O3 concentrations had a good peak-shaving effect. ② The proportion of alkanes and aromatic hydrocarbons in the atmospheric reactivity ozone formation potential （OFP） and ·OH radical loss rate（L·OH） decreased after the power restriction, but the proportion of the top ten contributing species increased compared with that before the power restriction, mainly due to the increase in isoprene emission from plants caused by high temperature. ③ From the source analysis results, the contribution of mobile sources, industrial sources, and oil and gas volatile sources remained the same before and after the power restriction, whereas the contribution of natural sources increased and that of solvent sources decreased. ④ Before the power restriction, the short-range transmission in the suburbs of Chengdu and the transmission around Meishan had an impact on Chengdu； however, after the power restriction, the potential source area was narrowed, the strong potential source weakened, and the impact weakened, which indicated that joint prevention and control had a greater effect on ozone pollution prevention and control in Chengdu. |
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