南京地区静稳天气下局地臭氧污染光化学成因  

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

作　　者：贺婕 安俊琳[1] 冯悦政 朱珈莹 吴玲霞 HE Jie;AN Jun-lin;FENG Yue-zheng;ZHU Jia-ying;WU Ling-xia(Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science and Technology,Nanjing 210044,China;Maoming Meteorological Bureau of Guangdong Province,Maoming 525099,China)

机构地区：[1]南京信息工程大学,中国气象局气溶胶‑云‑降水重点开放实验室,南京210044 [2]广东省茂名市气象局,茂名525099

出　　处：《环境科学》2025年第2期755-763,共9页Environmental Science

基　　金：国家自然科学基金项目(42075177);国家重点研发计划项目(2017YFC0210003);江苏省高校“青蓝工程”项目。

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(O_(3))超标日的O_(3)生成消耗机制.结果表明:(1)南京地区3个站点2015~2021年O_(3)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)、50d(PK)和54 d(XL),占O_(3)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O_(3)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).(3)HO_(2)·+NO和·OH+NO_(2)反应途径分别对O_(3)生成和消耗贡献最大.HO_(2)·+NO途径贡献了O_(3)生成的69%(CCM)、68%(PK)和71%(XL);·OH+NO_(2)途径贡献了O_(3)消耗的67%(CCM)、63%(PK)和62%(XL).(4)3个站点在静稳天气下的O_(3)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.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_(3) 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 O_(3) production and depletion rate at the XL site were lower compared to those at the other two sites.(3) The reactions of HO_2·+NO and·OH+NO_2,respectively,contributed the most to O_(3) production and depletion.The HO_2·+NO reaction contributed to O_(3production) by 69%(CCM),68%(PK),and 71%(XL),and the·OH+NO_(2) reaction contributed to O_(3) 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_(3) pollution mitigation.

关 键 词：南京 臭氧污染 MCM箱模型 静稳天气 臭氧生消 

分 类 号：X515[环境科学与工程—环境工程]