| 南京地区静稳天气下局地臭氧污染光化学成因 |
| 摘要点击 1032 全文点击 177 投稿时间：2024-01-15 修订日期：2024-04-24 |
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| 中文关键词 南京 臭氧污染 MCM箱模型 静稳天气 臭氧生消 |
| 英文关键词 Nanjing ozone pollution MCM box model air stagnation ozone production and depletion |
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| 中文摘要 |
| 基于2015～2021年南京市草场门（CCM）、浦口（PK）和仙林大学城（XL）这3个站点的挥发性有机物（VOCs）、常规空气污染物观测数据和ERA5气象再分析资料,利用箱式模型（OBM-MCM）研究探讨了静稳天气下臭氧（O3）超标日的O3生成消耗机制. 结果表明：①南京地区3个站点2015～2021年O3污染时期的静稳天数存在显著差异,其中2019年静稳天数最多,为46 d（CCM）、50 d（PK）和54 d（XL）,占O3超标天数的66.7%（CCM）、64.9%（PK）和69.2%（XL）. ②污染时期3个站点的O3生成和消耗速率存在差异,净生成速率最高值为2.5×10-9 h-1（CCM）,最低值为1.4×10-9 h-1（XL）. ③HO2·+NO和·OH+NO2反应途径分别对O3生成和消耗贡献最大. HO2·+NO途径贡献了O3生成的69%（CCM）、68%（PK）和71%（XL）；·OH+NO2途径贡献了O3消耗的67%（CCM）、63%（PK）和62%（XL）. ④3个站点在静稳天气下的O3污染主要受本地光化学反应影响,本地减排是污染控制的关键. |
| 英文摘要 |
| Based on the observational data of volatile organic compounds （VOCs）, conventional air pollutants, and ERA5 meteorological reanalysis data at three sites, namely, Caochangmen （CCM）, Pukou （PK）, and Xianlin University Town （XL）, in Nanjing from 2015 to 2021, the ozone generation and depletion mechanisms in ozone-polluted days under stable weather conditions were investigated using the observation-based model （OBM-MCM）. The results showed that ① Significant year-by-year differences exist in the frequency of stable weather on ozone-polluted days for the three sites. The maximum number of stable days occurred in 2019, with 46 d （66.7%）, 50 d （64.9%）, and 54 d （69.2%） at the CCM, PK, and XL sites, respectively. ② Significant differences exist between the net O3 production rates for the CCM, PK, and XL sites during the polluted period, with the highest rate of 2.5×10-9 h-1 at the CCM site and the lowest rate of 1.4×10-9 h-1 at the XL site. Additionally, the O3 production and depletion rate at the XL site were lower compared to those at the other two sites. ③ The reactions of HO2·+NO and ·OH+NO2, respectively, contributed the most to O3 production and depletion. The HO2·+NO reaction contributed to O3 production by 69% （CCM）, 68% （PK）, and 71% （XL）, and the ·OH+NO2 reaction contributed to O3 depletion by 67% （CCM）, 63% （PK）, and 62% （XL）. ④ The modeling study observed that ozone pollution under stable weather conditions was mainly affected by local photochemistry processes； therefore, local emission reduction is very important for O3 pollution mitigation. |
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