[Photochemical Causes of Localized Ozone Pollution under Static and Stable Weather in Nanjing Area].

Q2 Environmental Science
Jie He, Jun-Lin An, Yue-Zheng Feng, Jia-Ying Zhu, Ling-Xia Wu
{"title":"[Photochemical Causes of Localized Ozone Pollution under Static and Stable Weather in Nanjing Area].","authors":"Jie He, Jun-Lin An, Yue-Zheng Feng, Jia-Ying Zhu, Ling-Xia Wu","doi":"10.13227/j.hjkx.202401123","DOIUrl":null,"url":null,"abstract":"<p><p>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 O<sub>3</sub> production rates for the CCM, PK, and XL sites during the polluted period, with the highest rate of 2.5×10<sup>-9</sup> h<sup>-1</sup> at the CCM site and the lowest rate of 1.4×10<sup>-9</sup> h<sup>-1</sup> at the XL site. Additionally, the O<sub>3</sub> production and depletion rate at the XL site were lower compared to those at the other two sites. ③ The reactions of HO<sub>2</sub>·+NO and ·OH+NO<sub>2</sub>, respectively, contributed the most to O<sub>3</sub> production and depletion. The HO<sub>2</sub>·+NO reaction contributed to O<sub>3</sub> production by 69% (CCM), 68% (PK), and 71% (XL), and the ·OH+NO<sub>2</sub> reaction contributed to O<sub>3</sub> 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 O<sub>3</sub> pollution mitigation.</p>","PeriodicalId":35937,"journal":{"name":"环境科学","volume":"46 2","pages":"755-763"},"PeriodicalIF":0.0000,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"环境科学","FirstCategoryId":"1087","ListUrlMain":"https://doi.org/10.13227/j.hjkx.202401123","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"Environmental Science","Score":null,"Total":0}
引用次数: 0

Abstract

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.

[南京地区静稳定天气下局部臭氧污染的光化学成因]。
基于2015 - 2021年南京草场门(CCM)、浦口(PK)和仙林大学城(XL) 3个站点的挥发性有机物(VOCs)、常规大气污染物观测资料和ERA5气象再分析资料,采用基于观测的模式(OBM-MCM)对稳定天气条件下臭氧污染日的臭氧生成和耗损机制进行了研究。结果表明:①3个站点臭氧污染日稳定天气出现频率存在显著的年际差异;2019年稳定日数最多,CCM、PK和XL位点分别为46 d(66.7%)、50 d(64.9%)和54 d(69.2%)。②污染期CCM、PK和XL站点的净产O3速率存在显著差异,CCM站点的净产O3速率2.5×10-9 h-1最高,XL站点的净产O3速率1.4×10-9 h-1最低。此外,与其他两个地点相比,XL地点的O3产量和耗竭率较低。③HO2·+NO反应和·OH+NO2反应对O3的生成和消耗贡献最大。HO2·+NO反应对O3生成的贡献分别为69% (CCM)、68% (PK)和71% (XL),而·OH+NO2反应对O3消耗的贡献分别为67% (CCM)、63% (PK)和62% (XL)。④模拟研究发现,稳定天气条件下的臭氧污染主要受局部光化学过程的影响,因此,局部减排对O3污染的缓解至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
期刊介绍:
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信