In recent years,the intensification of O3 pollution in Nanjing has raised concerns.To understand the influence of neighboring cities on O3 levels in Nanjing,we used the source-oriented WRF/CMAQ regional air quality model to simulate air quality within the Yangtze River Delta (YRD) from March to October 2018.By tracking emissions from 41 cities within and outside the YRD,we conducted an analysis of O3 transport characteristics in Nanjing under different wind conditions.Our findings reveal during March to October 2018,Nanjing contributed 56.8％ of local O3 on polluted days and 49.5％ on non-polluted days.When pollution episodes occurred,contributions from surrounding cities to Nanjing increased from 36.4％ to 46.3％,whereas contribution from areas outside the YRD decreased from 6.8％ to 4.7％.On a daily basis,Nanjing accounted for over 70％ of local O3 contributions during daytime hours,while at night,the majority of transport contributions originated from surrounding cities and areas outside the YRD (exceeding 95％).On days with O3 pollution,contributions from Jiangsu Province constituted 73.1％,with 10.8％ from Zhejiang Province,10.5％ from Anhui Province,and 0.95％ from Shanghai.During pollution periods,the ratio of O3 (O3N) produced by NOx as a precursor to O3 (O3V) produced by VOCs as a precursor in Nanjing was approximately 7∶13.Among all pollution episodes,southeast and northeast winds accounted for 38.0％ and 35.9％ respectively,with the dominant wind direction being northeast,resulting in the highest concentration of non-background O3 in Nanjing.During periods of southeast winds,upwind areas such as Changzhou (7.3％),Zhenjiang (7.0％),and Wuxi (6.5％) contributed significantly O3 levels in Nanjing.Therefore,strategies for controlling O3 pollution in Nanjing should take into account pollutant transport from upwind cities.
龚康佳,李琳,史之浩,谢晓栋,胡建林,2023.长江三角洲地区污染物输送对南京臭氧影响的定量分析[J].大气科学学报,46(5):703-712. GONG Kangjia, LI Lin, SHI Zhihao, XIE Xiaodong, HU Jianlin,2023. Quantitative analysis of the impact of pollutant transport on ozone levels in Nanjing within the Yangtze River Delta Region[J]. Trans Atmos Sci,46(5):703-712. DOI:10.13878/j. cnki. dqkxxb.20220215001复制
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