The impact of the aerosol reduction on the worsening ozone pollution over the Beijing-Tianjin-Hebei region via influencing photolysis rates

Gao，Jinhui1,2,3; Li，Ying2,3; Xie，Zhouqing4; Hu，Bo5; Wang，Lili5; Bao，Fangwen2,3; Fan，Shidong2,3

2022-05-15

10.1016/j.scitotenv.2022.153197

SCIENCE OF THE TOTAL ENVIRONMENT   影响因子和分区

0048-9697

1879-1026

Due to the implementation of the toughest-ever emission control actions across China from 2013 to present, the aerosols are decreasing annually but ozone is simultaneously increasing, especially over the Beijing-Tianjin-Hebei (BTH) region, where ozone pollution can even spread into winter. Quantifying each impact of aerosols on ozone in all seasons is urgent for the worsening ozone pollution in the improved aerosol air quality. In this study, we focused on the impact of aerosols on ozone via influencing photolysis rates. The air pollutants were simulated over the Central East China (CEC) in 2018 by using the Weather Research and Forecasting with Chemistry (WRF-Chem) model. By implementing emissions with base years of 2014 and 2018, we quantified the increase in ozone (ΔOzone_photolysis) caused by the decreasing aerosol concentrations (ΔPM) by influencing photolysis rates over the BTH region in all seasons. Furthermore, combined with the ozone observations, the contribution of ΔOzone_photolysis to the total changes in ozone (ΔOzone_total) in all seasons was quantitatively discussed. Our results showed that ΔPM showed obvious seasonal variations, which PM decreased more significantly in winter and autumn than in spring and summer, although significant reductions in anthropogenic emissions were observed in all seasons. Consistent seasonal variations were also observed in ΔOzone_photolysis, and the mean increases reached 5.5 μg m, 2.6 μg m, 1.2 μg m, and 1.4 μg m in winter, autumn, spring, spring, and summer, respectively. Compared with ΔOzone_total, ΔOzone_photolysis accounted for 36.3%, 17.2%, 3.5% and 10.6% of ΔOzone_total in winter, autumn, spring, and summer, respectively, suggesting that ΔOzone_photolysis was not the primary contributor to the current changes in ozone over the BTH region. However, the 36.3% contribution to ΔOzone_total in winter suggested that ΔOzone_photolysis is still an important contributor and should not be ignored when discussing the formation of high ozone episodes occurring in winter.

Aerosol reductions Ozone pollution Photolysis rates WRF-Chem

SCI ; EI

英语

通讯

Guangdong Basic and Applied Basic Research Fund Committee[2020B1515130003] ; National Natural Science Foundation of China[41905114,42105124,41575106,41961160728] ; Shenzhen Science and Technology Program[KQTD20180411143441009] ; Key-Area Research and Development Program of Guangdong Province[2020B1111360001] ; NSFC/RGC[N_HKUST638/19] ; Science and Technology Planning Project of Guangdong Province[2017A050506003] ; Scientific Research Foundation of Chengdu University of Information Technology[KYTZ202121]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000766801500002

ELSEVIER

20220611584875

Aerosols ; Air quality ; Emission control ; Photolysis ; Weather forecasting

Meteorology:443 ; Air Pollution Control:451.2 ; Chemical Reactions:802.2 ; Chemical Products Generally:804

ENVIRONMENT/ECOLOGY

2-s2.0-85123887086

Scopus

1.Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,School of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu,China
2.Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,China
3.Center for the Oceanic and Atmospheric Science at SUSTech (COAST),Southern University of Science and Technology,Shenzhen,China
4.Department of Environmental Science and Engineering,University of Science and Technology of China,Hefei,China
5.State Key Laboratory of Atmosphere Boundary Layer Physics and Atmospheric Chemistry (LAPC),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing,China

Gao，Jinhui,Li，Ying,Xie，Zhouqing,et al. The impact of the aerosol reduction on the worsening ozone pollution over the Beijing-Tianjin-Hebei region via influencing photolysis rates[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2022,821.

Gao，Jinhui.,Li，Ying.,Xie，Zhouqing.,Hu，Bo.,Wang，Lili.,...&Fan，Shidong.(2022).The impact of the aerosol reduction on the worsening ozone pollution over the Beijing-Tianjin-Hebei region via influencing photolysis rates.SCIENCE OF THE TOTAL ENVIRONMENT,821.

Gao，Jinhui,et al."The impact of the aerosol reduction on the worsening ozone pollution over the Beijing-Tianjin-Hebei region via influencing photolysis rates".SCIENCE OF THE TOTAL ENVIRONMENT 821(2022).