Disentangling the effects of meteorology and emissions from anthropogenic and biogenic sources on the increased surface ozone in Eastern China

被引:0
作者
Shao, Min [1 ]
Lv, Shun [1 ]
Song, Yueming [3 ]
Liu, Rui [2 ]
Dai, Qili [4 ]
机构
[1] Nanjing Normal Univ, Sch Environm, Nanjing, Peoples R China
[2] Nanjing Univ, Sch Environm, Nanjing, Peoples R China
[3] United World Coll Atlantic, St Donats, Wales
[4] Nankai Univ, Coll Environm Sci & Engn, State Environm Protect Key Lab Urban Ambient Air P, Tianjin, Peoples R China
基金
中国国家自然科学基金;
关键词
Ozone; Meteorology; Emission; Aerosol feedback; SENSITIVITY; POLLUTION; AEROSOLS; IMPACTS; GASES; MODEL;
D O I
10.1016/j.atmosres.2024.107699
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
China's Clean Air Actions have substantially improved ambient PM2.5 air quality since 2013. However, ozone (O3) pollution in urban areas has worsened in recent years, particularly in the eastern region. The formation of O3 in these high emission areas is highly complex and regulated by numerous factors. Utilizing the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem), this study conducted a comprehensive analysis through nine sensitivity experiments for the years 2013 and 2017, aimed at disentangling the relative contributions of major factors (e.g., meteorological factors, anthropogenic emissions, biogenic emissions, and aerosol feedback mechanisms) to the observed O3 concentration trends in Jiangsu, a developed region of China with increasing trend of O3 level. Our findings indicate a pronounced increase in mean daily maximum 8-h average (MDA8) O3 levels in the economically vibrant southern Jiangsu, contrasted with a decrease in the less developed northern regions. The study identifies anthropogenic emissions change as the primary driver of O3 variations, with significant impacts also attributed to meteorological conditions and aerosol feedback effects, while biogenic emission shifts play a lesser role. In terms of meteorological factors, we discovered that the alteration in meteorological thermal factors (enhanced solar radiation and temperatures) in 2017, compared to 2013, exerted a more pronounced influence on the formation of O3 than the change in thermally driven dynamic factors (boundary layer height and wind speed). Moreover, the study observes a shift in O3 formation sensitivity from VOC-sensitive to transitional or NOX-sensitive regimes, signifying a notable transformation in the regional atmospheric chemistry conducive to O3 generation. Aerosol feedback effects, through complex pathways including photolysis rate alterations and modifications in the vertical O3 distribution, further compound the challenge of mitigating O3 levels. Our research underscores the necessity for adaptive, region-specific strategies to mitigate O3 pollution, providing potential insights for policymakers to formulate effective control measures.
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页数:12
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